Metadata-Version: 1.1
Name: freezer
Version: 3.0.0.0rc1
Summary: The OpenStack Backup Restore and Disaster Recovery as a Service Platform
Home-page: https://wiki.openstack.org/wiki/Freezer
Author: Freezer Team
Author-email: openstack-dev@lists.openstack.org
License: Apache-2
Description: =======
        Freezer
        =======
        
        .. image:: freezer_logo.jpg
        
        NOTE
        ----
        
        Freezer has four different components; Freezer Web UI, Freezer Scheduler,
        Freezer Agent and Freezer API.
        
        If you need to use Freezer Backup Restore DR as a Service platform, you need to
        install Freezer Scheduler, Freezer Agent on client and Freezer Web UI, Freezer
        API on OpenStack controller server.
        (The server where your Horizon and Keystone installed)
        
        This is the source code of Freezer Scheduler and Freezer Agent.
        
        If you need to get the source code of other components,
        please visit proper Github pages:
        
        Freezer Web UI:
        https://github.com/openstack/freezer-web-ui
        
        Freezer API:
        https://github.com/openstack/freezer-api
        
        Features
        ========
        
        Freezer is a Backup Restore DR as a Service platform that helps you to automate
        the data backup and restore process.
        
        The following features are available:
        
        -  Backup file system using point-in-time snapshot
        -  Strong encryption supported: AES-256-CFB
        -  Backup file system tree directly (without volume snapshot)
        -  Backup journalled MongoDB directory tree using lvm snapshot to Swift
        -  Backup MySQL with lvm snapshot
        -  Restore data from a specific date automatically to file system
        -  Low storage consumption as the backup are uploaded as a stream
        -  Flexible backup policy (incremental and differential)
        -  Data is archived in GNU Tar format for file based incremental
        -  Multiple compression algorithm support (zlib, bzip2, xz)
        -  Remove old backup automatically according to the provided parameters
        -  Multiple storage media support (Swift, local file system, or ssh)
        -  Flush kernel buffered memory to disk
        -  Multi-platform (Linux, Windows, \*BSD, OSX)
        -  Manage multiple jobs (I.e., multiple backups on the same node)
        -  Synchronize backups and restore on multiple nodes
        -  Web user interface integrated with OpenStack Horizon
        -  Execute scripts/commands before or after a job execution
        
        Freezer Components
        ==================
        
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        | Component         | Description                                                                                                                                    |
        +===================+================================================================================================================================================+
        | Freezer Web UI    | Web interface that interacts with the Freezer API to configure and change settings.                                                            |
        |                   | It provides most of the features from the Freezer Agent CLI, advanced scheduler settings such as multi-node backup synchronization,            |
        |                   | metrics, and reporting.                                                                                                                        |
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        | Freezer Scheduler | A client side component, running on the node where the data backup is to be executed.                                                          |
        |                   | It consists of a daemon that retrieves the data from the freezer API and executes jobs (i.e. backups, restore, admin actions, info actions,    |
        |                   | pre and/or post job scripts) by running the Freezer Agent.                                                                                     |
        |                   | The metrics and exit codes returned by the freezer agent are captured and sent to the Freezer API.                                             |
        |                   | The scheduler manages the execution and synchronization of multiple jobs executed on a single or multiple nodes.                               |
        |                   | The status of the execution of all the nodes is saved through the API.                                                                         |
        |                   | The Freezer scheduler takes care of uploading jobs to the API by reading job files on the file system.                                         |
        |                   | It also has its own configuration file where job session or other settings like the freezer API polling interval can be configured.            |
        |                   | The Freezer scheduler manages jobs, for more information about jobs please refer to: freezer_api/README.rst under JOB the sections             |
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        | Freezer Agent     | Multiprocessing Python software that runs on the client side, where the data backup is to be executed.                                         |
        |                   | It can be executed standalone or by the Freezer Scheduler.                                                                                     |
        |                   | The Freezer Agent provides a flexible way to execute backup, restore and other actions on a running system.                                    |
        |                   | In order to provide flexibility in terms of data integrity, speed, performance, resources usage, etc the freezer agent offers a                |
        |                   | wide range of options to execute optimized backup according the available resources as:                                                        |
        |                   |                                                                                                                                                |
        |                   |   - Segments size (the amount of memory used)                                                                                                  |
        |                   |   - Queues size (optimize backups where I/O, bandwidth, memory or CPU is a constraint)                                                         |
        |                   |   - I/O Affinity and process priority (it can be used with real time I/O and maximum user level process priority)                              |
        |                   |   - Bandwidth limitation                                                                                                                       |
        |                   |   - Client side Encryption (AES-256-CFB)                                                                                                       |
        |                   |   - Compression (multiple algorithms supported as zlib, bzip2, xz/lzma)                                                                        |
        |                   |   - Parallel upload to pluggable storage media (i.e., upload backup to swift and to a remote node by ssh,                                      |
        |                   |     or upload to two or more independent swift instances with different credentials, etc)                                                      |
        |                   |   - Execute file based incremental (like tar), block based incremental (like rsync algorithm) and differential based backup and restore        |
        |                   |   - Multi-platform as it can be run on Linux, Windows, \*BSD and OSX                                                                           |
        |                   |   - Automatic removal of old backups                                                                                                           |
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        | Freezer API       | The API is used to store and provide metadata to the Freezer Web UI and to the Freezer Scheduler.                                              |
        |                   | Also the API is used to store session information for multi node backup synchronization. No workload data is stored in the API.                |
        |                   | For more information to the API please refer to: freezer_api/README.rst                                                                        |
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        | DB Elasticsearch  | Backend used by the API to store and retrieve metrics, metadata sessions information, job status, etc.                                         |
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        
        Linux Requirements
        ==================
        
        -  OpenStack Swift Account (optional)
        -  python
        -  GNU Tar >= 1.26
        -  gzip, bzip2, xz
        -  OpenSSL
        -  python-swiftclient
        -  keystoneauth1
        -  pymongo
        -  PyMySQL
        -  libmysqlclient-dev
        -  sync
        -  libffi-dev
        -  libssl-dev
        -  python-dev
        -  At least 128 MB of memory reserved for Freezer
        
        Windows Requirements
        ====================
        
        - Python 2.7
        - GNU Tar binaries (we recommend to follow [this guide] (https://github.com/openstack-freezer-utils/freezer-windows-binaries#windows-binaries-for-freezer) to install them)
        - [OpenSSL pre-compiled for windows] (https://wiki.openssl.org/index.php/Binaries) or [direct download](https://indy.fulgan.com/SSL/openssl-1.0.1-i386-win32.zip)
        - [Sync] (https://technet.microsoft.com/en-us/sysinternals/bb897438.aspx)
        - [Microsoft Visual C++ Compiler for Python 2.7] (http://aka.ms/vcpython27)
        - [PyWin32 for python 2.7] (http://sourceforge.net/projects/pywin32/files/pywin32/Build%20219/)
        
        Add binaries to Windows Path
        ----------------------------
        Go to **Control Panel\System and Security\System** and then **Advanced System Settings**, and click **Environment Variables** under **System Variables** edit **Path** and append in the end.
        - ;C:\\Sync
        - ;C:\\OpenSSL-Win64\\bin
        - ;C:\\Python27;C:\\Python27\\Lib\\site-packages\\;C:\\Python27\\Scripts\\
        
        The following components support Windows OS Platform:
        
        - freezer-agent
        - freezer-scheduler
        
        Install Windows Scheduler
        -------------------------
        
        Freezer scheduler on windows run as a windows service and it needs to be installed as a user service.
        
        - open cmd as admin
        - whoami
        - cd C:\\Python27\\Lib\\site-packages\\freezer\\scheduler
        - python win_service.py --username {whoami} --password {pc-password} install
        
        
        Unofficial Installer for Windows
        --------------------------------
        
        Freezer offers a [windows installer] (https://github.com/openstack-freezer-utils/freezer-windows-installer#windows-freezer-installer) supported by the community
        
        
        
        Installation & Env Setup
        ========================
        
        Before Installation
        -------------------
        
        1-) Chose correct branch for corresponding OpenStack version.
        If your OpenStack installation is Kilo, chose Stable/Kilo release. etc...
        
        2-) This installation instruction only for Freezer Agent and Freezer Scheduler
        on client side. If you need to install other components, visit their Github page.
        
        3-) Make sure you have installed same version of all four components.
        Do not miss match different version. For example; do not use Freezer Agent Stable/Kilo
        release with Freeze API Stable/Liberty release.
        
        4-) Following installation instructions only for Freezer Scheduler
        and Freezer Agent.
        
        
        Ubuntu / Debian
        ---------------
        
        Swift client and Keystone client::
        
            $ sudo apt-get install -y python-dev
            For python3:
            $ sudo apt-get install -y python3-dev
            $ sudo easy_install -U pip
        
        MongoDB backup::
        
            $ sudo apt-get install -y python-pymongo
        
        MySQL backup::
        
            $ sudo pip install pymysql
        
        Freezer installation from Python package repo::
        
            $ sudo pip install freezer
        
        OR::
        
            $ sudo easy_install freezer
        
        The basic Swift account configuration is needed to use freezer. Make
        sure python-swiftclient is installed.
        
        Also the following ENV vars are needed. You can put them in ~/.bashrc::
        
            export OS_REGION_NAME=region-a.geo-1
            export OS_TENANT_ID=<account tenant>
            export OS_PASSWORD=<account password>
            export OS_AUTH_URL=https://region-a.geo-1.identity.hpcloudsvc.com:35357/v2.0
            export OS_USERNAME=automationbackup
            export OS_TENANT_NAME=automationbackup
        
            $ source ~/.bashrc
        
        Let's say you have a container called freezer_foobar-container, by executing
        "swift list" you should see something like::
        
            $ swift list
            freezer_foobar-container-2
            $
        
        These are just use case example using Swift in the HP Cloud.
        
        *Is strongly advised to execute backups using LVM snapshot, so
        freezer will execute a backup on point-in-time data. This avoids the risk of
        data inconsistencies and corruption.*
        
        
        Windows
        -------
        General packages::
        
            > easy_install -U pip
            > pip install freezer
        
        The basic Swift account configuration is needed to use freezer. Make sure python-swiftclient is installed::
        
            set OS_REGION_NAME=region-a.geo-1
            set OS_TENANT_ID=<account tenant>
            set OS_PASSWORD=<account password>
            set OS_AUTH_URL=https://region-a.geo-1.identity.hpcloudsvc.com:35357/v2.0
            set OS_USERNAME=automationbackup
            set OS_TENANT_NAME=automationbackup
        
        
        Usage Example
        =============
        
        Freezer will automatically add the prefix "freezer\_" to the container name,
        where it is provided by the user and doesn't already start with this prefix.
        If no container name is provided, the default is "freezer_backups".
        
        The execution options can be set from the command line and/or config file
        in ini format. There's an example of the job config file available in
        freezer/freezer/specs/job-backup.conf.example. Command line options
        always override the same options in the config file.
        
        Backup
        ------
        
        The most simple backup execution is a direct file system backup::
        
            $ sudo freezer-agent --path-to-backup /data/dir/to/backup
            --container freezer_new-data-backup --backup-name my-backup-name
        
            * On windows (need admin rights)*
            > freezer-agent --action backup --mode fs --backup-name testwindows
            --path-to-backup "C:\path\to\backup" --container freezer_windows
            --log-file  C:\path\to\log\freezer.log
        
        By default --mode fs is set. The command will generate a compressed tar
        gzip file of the directory /data/dir/to/backup. The generated file will
        be segmented in stream and uploaded in the Swift container called
        freezer_new-data-backup, with backup name my-backup-name.
        
        Now check to see if your backup executed correctly by looking at
        /var/log/freezer.log
        
        Execute a MongoDB backup using lvm snapshot:
        
        We need to check before to see on which volume group and logical volume our
        mongo data is located. This information can be obtained as per the following::
        
            $ mount
            [...]
        
        Once we know the volume on which our Mongo data is mounted, we can get
        the volume group and logical volume info::
        
            $ sudo vgdisplay
            [...]
            $ sudo lvdisplay
            [...]
        
        We assume our mongo volume is "/dev/mongo/mongolv" and the volume group
        is "mongo"::
        
            $ sudo freezer-agent --lvm-srcvol /dev/mongo/mongolv --lvm-dirmount /var/lib/snapshot-backup
            --lvm-volgroup mongo --path-to-backup /var/lib/snapshot-backup/mongod_ops2
            --container freezer_mongodb-backup-prod --exclude "*.lock" --mode mongo --backup-name mongod-ops2
        
        Now freezer-agent creates an lvm snapshot of the volume /dev/mongo/mongolv. If
        no options are provided, the default snapshot name is "freezer\_backup\_snap".
        The snapshot vol will be mounted automatically on /var/lib/snapshot-backup,
        and the backup metadata and segments will be uploaded in the container
        mongodb-backup-prod with the name mongod-ops2.
        
        Execute a file system backup using lvm snapshot::
        
            $ sudo freezer-agent --lvm-srcvol /dev/jenkins/jenkins-home --lvm-dirmount
            /var/snapshot-backup --lvm-volgroup jenkins
            --path-to-backup /var/snapshot-backup --container freezer_jenkins-backup-prod
            --exclude "\*.lock" --mode fs --backup-name jenkins-ops2
        
        MySQL backup requires a basic configuration file. The following is an
        example of the config::
        
            $ sudo cat /root/.freezer/db.conf
            host = your.mysql.host.ip
            user = backup
            password = userpassword
        
        Every listed option is mandatory. There's no need to stop the mysql
        service before the backup execution.
        
        Execute a MySQL backup using lvm snapshot::
        
            $ sudo freezer-agent --lvm-srcvol /dev/mysqlvg/mysqlvol
            --lvm-dirmount /var/snapshot-backup
            --lvm-volgroup mysqlvg --path-to-backup /var/snapshot-backup
            --mysql-conf /root/.freezer/freezer-mysql.conf--container
            freezer_mysql-backup-prod --mode mysql --backup-name mysql-ops002
        
        Cinder backups
        ==============
        
        To make a cinder backup you should provide cinder-vol-id or cindernative-vol-id
        parameters in command line arguments. Freezer doesn't do any additional checks
        and assumes that making a backup of that image will be sufficient to restore your
        data in the future.
        
        Execute a cinder backup::
        
            $ freezer-agent --cinder-vol-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b
        
        Execute a MySQL backup with Cinder::
        
           $ freezer-agent --mysql-conf /root/.freezer/freezer-mysql.conf
           --container freezer_mysql-backup-prod --mode mysql
           --backup-name mysql-ops002
           --cinder-vol-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b
        
        Nova backups
        ============
        
        To make a Nova backup you should provide a Nova parameter in the arguments.
        Freezer doesn't do any additional checks and assumes that making a backup
        of that instance will be sufficient to restore your data in future.
        
        Execute a nova backup::
        
            $ freezer-agent --nova-inst-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b
        
        Execute a MySQL backup with Nova::
        
           $ freezer-agent --mysql-conf /root/.freezer/freezer-mysql.conf
           --container freezer_mysql-backup-prod --mode mysql
           --backup-name mysql-ops002
           --nova-inst-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b
        
        All the freezer-agent activities are logged into /var/log/freezer.log.
        
        
        Swift, Local and SSH Storage
        ----------------------------
        
        Freezer can use:
        
        * local storage - a folder that is available in the same OS (may be mounted)
        * Swift storage - OS object storage
        * SSH storage - a folder on a remote machine
        
        Local Storage
        =============
        
        To use local storage specify "--storage local"
        And use "--container <path-to-folder-with-backups>"
        Backup example::
        
           $ sudo freezer-agent --path-to-backup /data/dir/to/backup
           --container /tmp/my_backup_path/ --backup-name my-backup-name
           --storage local
        
        Restore example::
        
           $ sudo freezer-agent --action restore --restore-abs-path /data/dir/to/backup
           --container /tmp/my_backup_path/ --backup-name my-backup-name
           --storage local
        
        
        Swift storage
        =============
        
        To use swift storage specify "--storage swift" or omit "--storage" parameter
        altogether (Swift storage is the default).
        And use "--container <swift-container-name>"
        
        Backup example::
        
           $ sudo freezer-agent --path-to-backup /data/dir/to/backup
           --container freezer-container --backup-name my-backup-name
           --storage swift
        
        Restore example::
        
           $ sudo freezer-agent --action restore --restore-abs-path /data/dir/to/backup
           --container freezer-container --backup-name my-backup-name
           --storage swift
        
        SSH storage
        ===========
        
        To use ssh storage specify "--storage ssh"
        And use "--container <path-to-folder-with-backups-on-remote-machine>"
        Also you should specify ssh-username, ssh-key and ssh-host parameters.
        ssh-port is optional parameter, default is 22.
        
        ssh-username for user ubuntu should be "--ssh-username ubuntu"
        ssh-key should be path to your secret ssh key "--ssh-key <path-to-secret-key>"
        ssh-host can be ip of remote machine or resolvable dns name "--ssh-host 8.8.8.8"
        
        Backup example::
        
           $ sudo freezer-agent --path-to-backup /data/dir/to/backup
           --container /remote-machine-path/ --backup-name my-backup-name
           --storage ssh --ssh-username ubuntu --ssh-key ~/.ssh/id_rsa
           --ssh-host 8.8.8.8
        
        Restore example::
        
          $ sudo freezer-agent  --action restore --restore-abs-pat /data/dir/to/backup
          --container /remote-machine-path/ --backup-name my-backup-name
          --storage ssh --ssh-username ubuntu --ssh-key ~/.ssh/id_rsa
          --ssh-host 8.8.8.8
        
        
        Restore
        -------
        
        As a general rule, when you execute a restore, the application that
        writes or reads data should be stopped so that during the restore
        operation, the restored data is not inadvertantly read or written by the
        application.
        
        There are 3 main options that need to be set for data restore
        
        file system Restore:
        
        Execute a file system restore of the backup name
        adminui.git::
        
            $ sudo freezer-agent --action restore --container freezer_foobar-container-2
            --backup-name adminui.git
            --hostname git-HP-DL380-host-001 --restore-abs-path
            /home/git/repositories/adminui.git/
            --restore-from-date "2014-05-23T23:23:23"
        
        MySQL restore:
        
        Execute a MySQL restore of the backup name holly-mysql.
        Let's stop mysql service first::
        
            $ sudo service mysql stop
        
        Execute Restore::
        
            $ sudo freezer-agent --action restore --container freezer_foobar-container-2
            --backup-name mysq-prod --hostname db-HP-DL380-host-001
            --restore-abs-path /var/lib/mysql --restore-from-date "2014-05-23T23:23:23"
        
        And finally restart mysql::
        
            $ sudo service mysql start
        
        Execute a MongoDB restore of the backup name mongobigdata::
        
            $ sudo freezer-agent --action restore --container freezer_foobar-container-2
            --backup-name mongobigdata --hostname db-HP-DL380-host-001
            --restore-abs-path /var/lib/mongo --restore-from-date "2014-05-23T23:23:23"
        
        
        List remote containers::
        
            $ sudo freezer-agent --action info
        
        List remote objects in container::
        
            $ sudo freezer-agent --action info --container freezer_testcontainer -l
        
        
        Remove backups older then 1 day::
        
            $ freezer-agent --action admin --container freezer_dev-test --remove-older-then 1 --backup-name dev-test-01
        
        
        Cinder restore currently creates a volume with the contents of the saved one,
        but doesn't implement detachment of existing volume and attachment of the new
        one to the vm. You should implement these steps manually. To create a new volume
        from existing content run the next command:
        
        Execute a cinder restore::
        
            $ freezer-agent --action restore --cinder-inst-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b
            $ freezer-agent --action restore --cindernative-vol-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b
        
        Nova restore currently creates an instance with the content of saved one, but the
        ip address of the vm will be different as well as its id.
        
        Execute a nova restore::
        
            $ freezer-agent --action restore --nova-inst-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b
        
        Local storage restore execution::
        
            $ sudo freezer-agent --action restore --container /local_backup_storage/
            --backup-name adminui.git
            --hostname git-HP-DL380-host-001 --restore-abs-path
            /home/git/repositories/adminui.git/
            --restore-from-date "2014-05-23T23:23:23"
            --storage local
        
        Architecture
        ============
        
        
        Freezer architectural components are the following:
        
        -  OpenStack Swift (the storage)
        -  freezer client running on the node where the backups and restores are to be executed
        
        Freezer uses GNU Tar under the hood to execute incremental backup and
        restore. When a key is provided, it uses OpenSSL to encrypt data.
        (AES-256-CFB)
        
        =============
        
        The Freezer architecture is composed of the following components:
        
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        | Component         | Description                                                                                                                                    |
        +===================+================================================================================================================================================+
        | Freezer Web UI    | Web interface that interacts with the Freezer API to configure and change settings.                                                            |
        |                   | It provides most of the features from the freezer-agent CLI as well as advanced scheduler settings such as multi-node backup synchronization,  |
        |                   | metrics, and reporting.                                                                                                                        |
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        | Freezer Scheduler | A client side component, running on the node where the data backup is to be executed.                                                          |
        |                   | It consists of a daemon that retrieves the data from the freezer API and executes jobs (i.e., backups, restore, admin actions, info actions,   |
        |                   | pre and/or post job scripts) by running the Freezer Agent.                                                                                     |
        |                   | The metrics and exit codes returned by the freezer agent are captured and sent to the Freezer API.                                             |
        |                   | The scheduler manages the execution and synchronization of multiple jobs executed on a single or multiple nodes.                               |
        |                   | The status of the execution of all the nodes is saved through the API.                                                                         |
        |                   | The Freezer scheduler takes care of uploading jobs to the API by reading job files on the file system.                                         |
        |                   | It also has its own configuration file where job session or other settings like the freezer API polling interval can be configured.            |
        |                   | The Freezer scheduler manages jobs. For more information about jobs please refer to: freezer_api/README.rst under JOB the sections             |
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        | Freezer Agent     | Multiprocessing Python software that runs on the client side, where the data backup is to be executed.                                         |
        |                   | It can be executed standalone or by the Freezer Scheduler.                                                                                     |
        |                   | The freezer-agent provides a flexible way to execute backup, restore and other actions on a running system.                                    |
        |                   | In order to provide flexibility in terms of data integrity, speed, performance, resources usage, etc the freezer agent offers a                |
        |                   | wide range of options to execute optimized backup according the available resources as:                                                        |
        |                   |                                                                                                                                                |
        |                   |   - Segments size (the amount of memory used)                                                                                                  |
        |                   |   - Queues size (optimize backups where I/O, bandwidth, memory or CPU is a constraint)                                                         |
        |                   |   - I/O Affinity and process priority (it can be used with real time I/O and maximum user level process priority)                              |
        |                   |   - Bandwidth limitation                                                                                                                       |
        |                   |   - Client side Encryption (AES-256-CFB)                                                                                                       |
        |                   |   - Compression (multiple algorithms supported as zlib, bzip2, xz/lzma)                                                                        |
        |                   |   - Parallel upload to pluggable storage media (i.e.,upload backup to swift and to a remote node by SSH,                                       |
        |                   |     or upload to two or more independent swift instances with different credentials, etc)                                                      |
        |                   |   - Execute file based incremental (like tar), block based incremental (like rsync algorithm) and differential based backup and restore        |
        |                   |   - Multi-platform as it can be run on Linux, Windows, \*BSD and OSX                                                                           |
        |                   |   - Automatic removal of old backups                                                                                                           |
        |                   |                                                                                                                                                |
        |                   | "freezerc" binary is deprecated and won't be available in next releases. Use freezer-agent instead.                                            |
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        | Freezer API       | The API is used to store and provide metadata to the Freezer Web UI and to the Freezer Scheduler.                                              |
        |                   | Also the API is used to store session information for multi node backup synchronization. No workload data is stored in the API.                |
        |                   | For more information on the API please refer to: freezer_api/README.rst                                                                        |
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        | DB ElasticSearch  | Backend used by the API to store and retrieve metrics, metadata sessions information, job status, etc.                                         |
        +-------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
        
        Freezer currently uses GNU Tar under the hood to execute incremental backup and
        restore. When a key is provided, it uses OpenSSL to encrypt data (AES-256-CFB).
        
        The following diagrams can help to better understand the solution:
        
        **Service Architecture**
        
        .. image::
            specs/Service_Architecture_02.png
        
        **Freezer Agent backup work flow with API**
        
        .. image::
            specs/freezer_agent_backup_api.png
        
        **Freezer Agent backup without API**
        
        .. image::
            specs/freezer_agent_backup.png
        
        **Freezer Scheduler with API**
        
        .. image:: specs/freezer_scheduler_api.png
        
        **Freezer Job Session**
        
        .. image:: specs/job_session.png
        
        **Freezer Dashboard**
        
        .. image:: specs/freezer_dashboard.png
        
        **How to scale**
        
        .. image:: specs/freezer_scheduler_api.png
        
        Low resources requirement
        -------------------------
        
        Freezer is designed to reduce to the minimum I/O, CPU and Memory Usage.
        This is achieved by generating a data stream from tar (for archiving)
        and gzip (for compressing). Freezer segments the stream in a configurable
        chunk size (with the option --max-seg-size). The default segment size is
        64MB, so it can be safely stored in memory, encrypted if the key is
        provided, and uploaded to Swift as a segment.
        
        Multiple segments are sequentially uploaded using the Swift Manifest.
        All the segments are uploaded first, and then the Manifest file is
        uploaded too, so the data segments cannot be accessed directly. This
        ensures data consistency.
        
        By keeping the segments small, in-memory, I/O usage is reduced. Also as
        there's no need to store locally the final compressed archive
        (tar-gziped), no additional or dedicated storage is required for the
        backup execution. The only additional storage needed is the LVM snapshot
        size (set by default at 5GB). The lvm snapshot size can be set with the
        option --lvm-snapsize. It is important to not specify a too small snapshot
        size, because in case a quantity of data is being written to the source
        volume and consequently the lvm snapshot is filled up, then the data will be
        corrupted.
        
        If more memory is available for the backup process, the maximum
        segment size can be increased. This will speed up the process. Please
        note that the segments must be smaller then 5GB, since that is the maximum
        object size in the Swift server.
        
        On the other hand, if a server has small memory availability, the
        --max-seg-size option can be set to lower values. The unit of this
        option is in bytes.
        
        How the incremental works
        -------------------------
        
        The incremental backups is one of the most crucial features. The
        following basic logic happens when Freezer executes:
        
        1) Freezer starts the execution and checks if the provided backup name for
           the current node already exists in Swift.
        
        2) If the backup exists, then the Manifest file is retrieved. This is
           important as the Manifest file contains the information of the
           previous Freezer execution.
        
        
        Nova and Cinder Backups
        -----------------------
        
        If our data is stored on cinder volume or nova instance disk, we can implement
        file backup using nova snapshots or volume backups.
        
        Nova backups
        ============
        
        If you provide nova arguments in the parameters, freezer assumes that all
        necessary data is located on instance disk and it can be successfully stored
        using nova snapshot mechanism.
        
        For example if we want to store our MySQL located on instance disk, we
        will execute the same actions as in the case of lvm or tar snapshots, but
        we will invoke nova snapshot instead of lvm or tar.
        
        After that we will place the snapshot in a Swift container as a dynamic large object.
        
        container/<instance_id>/<timestamp> <- large object with metadata
        container_segments/<instance_id>/<timestamp>/segments...
        
        Restore will create a snapshot from stored data and restore an instance from
        this snapshot. Instance will have different id and old instance should be
        terminated manually.
        
        
        Cinder backups
        ==============
        
        Cinder has its own mechanism for backups, and freezer supports it. But it also
        allows creating a glance image from volume and uploading to swift.
        
        To use standard cinder backups please provide --cindernative-vol-id argument.
        
        
        Parallel backup
        ---------------
        
        Parallel backup can be executed only by config file. In config file you
        should create n additional sections that start with "storage:"
        
        Example [storage:my_storage1], [storage:ssh], [storage:storage3]
        
        Each storage section should have 'container' argument and all parameters
        related to the storage
        
        Example: ssh-username, ssh-port
        
        For swift storage you should provide additional parameter called 'osrc'
        Osrc should be a path to file with Openstack Credentials like::
        
          unset OS_DOMAIN_NAME
          export OS_AUTH_URL=http://url:5000/v3
          export OS_PROJECT_NAME=project_name
          export OS_USERNAME=username
          export OS_PASSWORD=secret_password
          export OS_PROJECT_DOMAIN_NAME=Default
          export OS_USER_DOMAIN_NAME=Default
          export OS_IDENTITY_API_VERSION=3
          export OS_AUTH_VERSION=3
          export OS_CACERT=/etc/ssl/certs/ca-certificates.crt
          export OS_ENDPOINT_TYPE=internalURL
        
        Example of Config file for two local storages and one swift storage::
        
          [default]
          action = backup
          mode = fs
          path_to_backup = /foo/
          backup_name = mytest6
          always_level = 2
          max_segment_size = 67108864
          container = /tmp/backup/
          storage = local
          [storage:first]
          storage=local
          container = /tmp/backup1/
          [storage:second]
          storage=local
          container = /tmp/backup2/
          [storage:swift]
          storage=swift
          container = test
          osrc = openrc.osrc
        
        freezer-scheduler
        -----------------
        The freezer-scheduler is one of the two freezer components which is run on
        the client nodes; the other one being the freezer-agent.
        It has a double role: it is used both to start the scheduler process, and as
        a cli-tool which allows the user to interact with the API.
        
        The freezer-scheduler process can be started/stopped in daemon mode using the usual
        positional arguments::
        
          freezer-scheduler start|stop
        
        It can be also be started as a foreground process using the ``--no-daemon`` flag::
        
          freezer-scheduler --no-daemon start
        
        This can be useful for testing purposes, when launched in a Docker container,
        or by a babysitting process such as systemd.
        
        The cli-tool version is used to manage the jobs in the API.
        A "job" is basically a container; a document which contains one
        or more "actions".
        
        An action contains the instructions for the freezer-agent. They are the same
        parameters that would be passed to the agent on the command line. For example:
        "backup_name", "path_to_backup", "max_level"
        
        To sum it up, a job is a sequence of parameters that the scheduler pulls
        from the API and passes to a newly spawned freezer-agent process at the
        right time.
        
        The scheduler understands the "scheduling" part of the job document,
        which it uses to actually schedule the job, while the rest of the parameters
        are substantially opaque.
        
        It may also be useful to use the ``-c`` parameter to specify the client-id that
        the scheduler will use when interacting with the API.
        
        The purpose of the *client-id* is to associate a job with the
        scheduler instance which is supposed to execute that job.
        
        A single OpenStack user could manage different resources on different nodes
        (and actually may even have different freezer-scheduler instances running
        on the same node with different local privileges, for example),
        and the client-id allows him to associate the specific scheduler instance
        with its specific jobs.
        
        When not provided with a custom client-id, the scheduler falls back to the default
        which is composed from the tenant-id and the hostname of the machine on which it is
        running.
        
        
        The first step to use the scheduler is creating a document with the job::
        
          cat test_job.json
        
          {
            "job_actions": [
                {
                    "freezer_action": {
                        "action": "backup",
                        "mode": "fs",
                        "backup_name": "backup1",
                        "path_to_backup": "/home/me/datadir",
                        "container": "schedule_backups",
                        "log_file": "/home/me/.freezer/freezer.log"
                    },
                    "max_retries": 3,
                    "max_retries_interval": 60
                }
            ],
            "job_schedule": {
                "schedule_interval": "4 hours",
                "schedule_start_date": "2015-08-16T17:58:00"
            },
            "description": "schedule_backups 6"
          }
        
        Then upload that job into the API::
        
          freezer-scheduler -c node12 job-create --file test_job.json
        
        The newly created job can be found with::
        
          freezer-scheduler -c node12 job-list
        
          +----------------------------------+--------------------+-----------+--------+-------+--------+------------+
          |              job_id              |    description     | # actions | status | event | result | session_id |
          +----------------------------------+--------------------+-----------+--------+-------+--------+------------+
          | 07999ea33a494ccf84590191d6fe850c | schedule_backups 6 |     1     |        |       |        |            |
          +----------------------------------+--------------------+-----------+--------+-------+--------+------------+
        
        Its content can be read with::
        
          freezer-scheduler -c node12 job-get -j 07999ea33a494ccf84590191d6fe850c
        
        The scheduler can be started on the target node with::
        
          freezer-scheduler -c node12 -i 15 -f ~/job_dir start
        
        The scheduler could have already been started. As soon as the freezer-scheduler contacts the API,
        it fetches the job and schedules it.
        
        
        Misc
        ====
        
        Dependencies notes
        ------------------
        In stable/kilo and stable/liberty the module ``pep3143daemon`` is imported
        from local path rather than pip. This generated many issues as the package
        is not in the global-requirements.txt of kilo and liberty.
        
        Also pbr in the kilo release does not support env markers which further
        complicated the installation.
        
        Please check the `FAQ <FAQ.rst>`_ too.
        
        Available options::
        
            usage: freezer-agent [-h] [--action ACTION] [--always-level ALWAYS_LEVEL]
                             [--backup-name BACKUP_NAME]
                             [--cinder-vol-id CINDER_VOL_ID]
                             [--cindernative-vol-id CINDERNATIVE_VOL_ID]
                             [--command COMMAND] [--compression COMPRESSION]
                             [--config CONFIG] [--config-dir DIR] [--config-file PATH]
                             [--container CONTAINER] [--debug]
                             [--dereference-symlink DEREFERENCE_SYMLINK]
                             [--download-limit DOWNLOAD_LIMIT] [--dry-run]
                             [--encrypt-pass-file ENCRYPT_PASS_FILE]
                             [--exclude EXCLUDE] [--hostname HOSTNAME] [--insecure]
                             [--log-config-append PATH]
                             [--log-date-format DATE_FORMAT] [--log-dir LOG_DIR]
                             [--log-file PATH] [--log-format FORMAT]
                             [--lvm-auto-snap LVM_AUTO_SNAP]
                             [--lvm-dirmount LVM_DIRMOUNT]
                             [--lvm-snap-perm LVM_SNAPPERM]
                             [--lvm-snapname LVM_SNAPNAME]
                             [--lvm-snapsize LVM_SNAPSIZE] [--lvm-srcvol LVM_SRCVOL]
                             [--lvm-volgroup LVM_VOLGROUP] [--max-level MAX_LEVEL]
                             [--max-priority MAX_PRIORITY]
                             [--max-segment-size MAX_SEGMENT_SIZE]
                             [--metadata-out METADATA_OUT] [--mode MODE]
                             [--mysql-conf MYSQL_CONF]
                             [--no-incremental NO_INCREMENTAL] [--nodebug]
                             [--nodry-run] [--noinsecure] [--nooverwrite] [--noquiet]
                             [--nouse-syslog] [--nouse-syslog-rfc-format]
                             [--nova-inst-id NOVA_INST_ID] [--noverbose]
                             [--nowatch-log-file]
                             [--os-identity-api-version OS_IDENTITY_API_VERSION]
                             [--overwrite] [--path-to-backup PATH_TO_BACKUP]
                             [--proxy PROXY] [--quiet]
                             [--remove-from-date REMOVE_FROM_DATE]
                             [--remove-older-than REMOVE_OLDER_THAN]
                             [--restart-always-level RESTART_ALWAYS_LEVEL]
                             [--restore-abs-path RESTORE_ABS_PATH]
                             [--restore-from-date RESTORE_FROM_DATE]
                             [--snapshot SNAPSHOT] [--sql-server-conf SQL_SERVER_CONF]
                             [--ssh-host SSH_HOST] [--ssh-key SSH_KEY]
                             [--ssh-port SSH_PORT] [--ssh-username SSH_USERNAME]
                             [--storage STORAGE]
                             [--syslog-log-facility SYSLOG_LOG_FACILITY]
                             [--upload-limit UPLOAD_LIMIT] [--use-syslog]
                             [--use-syslog-rfc-format] [--verbose] [--version]
                             [--watch-log-file]
        
        optional arguments:
          -h, --help            show this help message and exit
          --action ACTION       Set the action to be taken. backup and restore are
                                self explanatory, info is used to retrieve info from
                                the storage media, exec is used to execute a script,
                                while admin is used to delete old backups and other
                                admin actions. Default backup.
          --always-level ALWAYS_LEVEL
                                Set backup maximum level used with tar to implement
                                incremental backup. If a level 3 is specified, the
                                backup will be executed from level 0 to level 3 and to
                                that point always a backup level 3 will be executed.
                                It will not restart from level 0. This option has
                                precedence over --max-backup-level. Default False
                                (Disabled)
          --backup-name BACKUP_NAME, -N BACKUP_NAME
                                The backup name you want to use to identify your
                                backup on Swift
          --cinder-vol-id CINDER_VOL_ID
                                Id of cinder volume for backup
          --cindernative-vol-id CINDERNATIVE_VOL_ID
                                Id of cinder volume for native backup
          --command COMMAND     Command executed by exec action
          --compression COMPRESSION
                                compression algorithm to use. gzip is default
                                algorithm
          --config CONFIG       Config file abs path. Option arguments are provided
                                from config file. When config file is used any option
                                from command line provided take precedence.
          --config-dir DIR      Path to a config directory to pull \*.conf files from.
                                This file set is sorted, so as to provide a
                                predictable parse order if individual options are
                                over-ridden. The set is parsed after the file(s)
                                specified via previous --config-file, arguments hence
                                over-ridden options in the directory take precedence.
          --config-file PATH    Path to a config file to use. Multiple config files
                                can be specified, with values in later files taking
                                precedence. Defaults to None.
          --container CONTAINER, -C CONTAINER
                                The Swift container (or path to local storage) used to
                                upload files to
          --debug, -d           If set to true, the logging level will be set to DEBUG
                                instead of the default INFO level.
          --dereference-symlink DEREFERENCE_SYMLINK
                                Follow hard and soft links and archive and dump the
                                files they refer to. Default False.
          --download-limit DOWNLOAD_LIMIT
                                Download bandwidth limit in Bytes per sec. Can be
                                invoked with dimensions (10K, 120M, 10G).
          --dry-run             Do everything except writing or removing objects
          --encrypt-pass-file ENCRYPT_PASS_FILE
                                Passing a private key to this option, allow you to
                                encrypt the files before to be uploaded in Swift.
                                Default do not encrypt.
          --exclude EXCLUDE     Exclude files,given as a PATTERN.Ex: --exclude '\*.log'
                                will exclude any file with name ending with .log.
                                Default no exclude
          --hostname HOSTNAME, --restore_from_host HOSTNAME
                                Set hostname to execute actions. If you are executing
                                freezer from one host but you want to delete objects
                                belonging to another host then you can set this option
                                that hostname and execute appropriate actions. Default
                                current node hostname.
          --insecure            Allow to access swift servers without checking SSL
                                certs.
          --log-config-append PATH, --log_config PATH
                                The name of a logging configuration file. This file is
                                appended to any existing logging configuration files.
                                For details about logging configuration files, see the
                                Python logging module documentation. Note that when
                                logging configuration files are used all logging
                                configuration is defined in the configuration file and
                                other logging configuration options are ignored (for
                                example, log_format).
          --log-date-format DATE_FORMAT
                                Defines the format string for %(asctime)s in log
                                records. Default: None . This option is ignored if
                                log_config_append is set.
          --log-dir LOG_DIR, --logdir LOG_DIR
                                (Optional) The base directory used for relative
                                log_file paths. This option is ignored if
                                log_config_append is set.
          --log-file PATH, --logfile PATH
                                (Optional) Name of log file to send logging output to.
                                If no default is set, logging will go to stderr as
                                defined by use_stderr. This option is ignored if
                                log_config_append is set.
          --log-format FORMAT   DEPRECATED. A logging.Formatter log message format
                                string which may use any of the available
                                logging.LogRecord attributes. This option is
                                deprecated. Please use logging_context_format_string
                                and logging_default_format_string instead. This option
                                is ignored if log_config_append is set.
          --lvm-auto-snap LVM_AUTO_SNAP
                                Automatically guess the volume group and volume name
                                for given PATH.
          --lvm-dirmount LVM_DIRMOUNT
                                Set the directory you want to mount the lvm snapshot
                                to. If not provided, a unique name will be generated
                                with thebasename /var/lib/freezer
          --lvm-snap-perm LVM_SNAPPERM
                                Set the lvm snapshot permission to use. If the
                                permission is set to ro The snapshot will be immutable
                                - read only -. If the permission is set to rw it will
                                be mutable
          --lvm-snapname LVM_SNAPNAME
                                Set the name of the snapshot that will be created. If
                                not provided, a unique name will be generated.
          --lvm-snapsize LVM_SNAPSIZE
                                Set the lvm snapshot size when creating a new
                                snapshot. Please add G for Gigabytes or M for
                                Megabytes, i.e. 500M or 8G. It is also possible to use
                                percentages as with the -l option of lvm, i.e. 80%FREE
                                Default 1G.
          --lvm-srcvol LVM_SRCVOL
                                Set the lvm volume you want to take a snaphost from.
                                Default no volume
          --lvm-volgroup LVM_VOLGROUP
                                Specify the volume group of your logical volume. This
                                is important to mount your snapshot volume. Default
                                not set
          --max-level MAX_LEVEL
                                Set the backup level used with tar to implement
                                incremental backup. If a level 1 is specified but no
                                level 0 is already available, a level 0 will be done
                                and subsequently backs to level 1. Default 0 (No
                                Incremental)
          --max-priority MAX_PRIORITY
                                Set the cpu process to the highest priority (i.e. -20
                                on Linux) and real-time for I/O. The process priority
                                will be set only if nice and ionice are installed
                                Default disabled. Use with caution.
          --max-segment-size MAX_SEGMENT_SIZE, -M MAX_SEGMENT_SIZE
                                Set the maximum file chunk size in bytes to upload to
                                swift Default 33554432 bytes (32MB)
          --metadata-out METADATA_OUT
                                Set the filename to which write the metadata regarding
                                the backup metrics. Use '-' to output to standard
                                output.
          --mode MODE, -m MODE  Set the technology to back from. Options are, fs
                                (filesystem),mongo (MongoDB), mysql (MySQL), sqlserver
                                (SQL Server) Default set to fs
          --mysql-conf MYSQL_CONF
                                Set the MySQL configuration file where freezer
                                retrieve important information as db_name, user,
                                password, host, port. Following is an example of
                                config file: # backup_mysql_confhost = <db-host>user =
                                <mysqluser>password = <mysqlpass>port = <db-port>
          --no-incremental NO_INCREMENTAL
                                Disable incremental feature. By default freezer build
                                the meta data even for level 0 backup. By setting this
                                option incremental meta data is not created at all.
                                Default disabled
          --nodebug             The inverse of --debug
          --nodry-run           The inverse of --dry-run
          --noinsecure          The inverse of --insecure
          --nooverwrite         The inverse of --overwrite
          --noquiet             The inverse of --quiet
          --nouse-syslog        The inverse of --use-syslog
          --nouse-syslog-rfc-format
                                The inverse of --use-syslog-rfc-format
          --nova-inst-id NOVA_INST_ID
                                Id of nova instance for backup
          --noverbose           The inverse of --verbose
          --nowatch-log-file    The inverse of --watch-log-file
          --os-identity-api-version OS_IDENTITY_API_VERSION, --os_auth_ver OS_IDENTITY_API_VERSION
                                Openstack identity api version, can be 1, 2, 2.0 or 3
          --overwrite           With overwrite removes files from restore path before
                                restore.
          --path-to-backup PATH_TO_BACKUP, -F PATH_TO_BACKUP
                                The file or directory you want to back up to Swift
          --proxy PROXY         Enforce proxy that alters system HTTP_PROXY and
                                HTTPS_PROXY, use '' to eliminate all system proxies
          --quiet, -q           Suppress error messages
          --remove-from-date REMOVE_FROM_DATE
                                Checks the specified container and removes objects
                                older than the provided datetime in the form 'YYYY-MM-
                                DDThh:mm:ss' i.e. '1974-03-25T23:23:23'. Make sure the
                                'T' is between date and time
          --remove-older-than REMOVE_OLDER_THAN, -R REMOVE_OLDER_THAN
                                Checks in the specified container for object older
                                than the specified days. If i.e. 30 is specified, it
                                will remove the remote object older than 30 days.
                                Default False (Disabled) The option --remove-older-
                                then is deprecated and will be removed soon
          --restart-always-level RESTART_ALWAYS_LEVEL
                                Restart the backup from level 0 after n days. Valid
                                only if --always-level option if set. If --always-
                                level is used together with --remove-older-then, there
                                might be the chance where the initial level 0 will be
                                removed. Default False (Disabled)
          --restore-abs-path RESTORE_ABS_PATH
                                Set the absolute path where you want your data
                                restored. Default False.
          --restore-from-date RESTORE_FROM_DATE
                                Set the date of the backup from which you want to
                                restore.This will select the most recent backup
                                previous to the specified date (included). Example: if
                                the last backup was created at '2016-03-22T14:29:01'
                                and restore-from-date is set to '2016-03-22T14:29:01',
                                the backup will be restored successfully. The same for
                                any date after that, even if the provided date is in
                                the future. However if restore-from-date is set to
                                '2016-03-22T14:29:00' or before, that backup will not
                                be found. Please provide datetime in format 'YYYY-MM-
                                DDThh:mm:ss' i.e. '1979-10-03T23:23:23'. Make sure the
                                'T' is between date and time Default None.
          --snapshot SNAPSHOT, -s SNAPSHOT
                                Create a snapshot of the fs containing the resource to
                                backup. When used, the lvm parameters will be guessed
                                and/or the default values will be used, on windows it
                                will invoke vssadmin
          --sql-server-conf SQL_SERVER_CONF
                                Set the SQL Server configuration file where freezer
                                retrieve the sql server instance. Following is an
                                example of config file: instance = <db-instance>
          --ssh-host SSH_HOST   Remote host for ssh storage only
          --ssh-key SSH_KEY     Path to ssh-key for ssh storage only
          --ssh-port SSH_PORT   Remote port for ssh storage only (default 22)
          --ssh-username SSH_USERNAME
                                Remote username for ssh storage only
          --storage STORAGE     Storage for backups. Can be Swift or Local now. Swift
                                is default storage now. Local stores backups on the
                                same defined path and swift will store files in
                                container.
          --syslog-log-facility SYSLOG_LOG_FACILITY
                                Syslog facility to receive log lines. This option is
                                ignored if log_config_append is set.
          --upload-limit UPLOAD_LIMIT
                                Upload bandwidth limit in Bytes per sec. Can be
                                invoked with dimensions (10K, 120M, 10G).
          --use-syslog          Use syslog for logging. Existing syslog format is
                                DEPRECATED and will be changed later to honor RFC5424.
                                This option is ignored if log_config_append is set.
          --use-syslog-rfc-format
                                Enables or disables syslog rfc5424 format for logging.
                                If enabled, prefixes the MSG part of the syslog
                                message with APP-NAME (RFC5424). This option is
                                ignored if log_config_append is set.
          --verbose, -v         If set to false, the logging level will be set to
                                WARNING instead of the default INFO level.
          --version             show program's version number and exit
          --watch-log-file      Uses logging handler designed to watch file system.
                                When log file is moved or removed this handler will
                                open a new log file with specified path
                                instantaneously. It makes sense only if log_file
                                option is specified and Linux platform is used. This
                                option is ignored if log_config_append is set.
        
        
        Scheduler Options
        -----------------
        
        To get an updated sample of freezer-scheduler configuration you the following command::
        
            oslo-config-generator --config-file config-generator/scheduler.conf
        
        you will find the update sample file in etc/scheduler.conf.sample
        
        Agent Options
        -------------
        
        To list options available in freezer-agent use the following command::
        
            oslo-config-generator --namespace freezer --namespace oslo.log
        
        this will print all options to the screen you direct the output to a file if you want::
        
            oslo-config-generator --namespace freezer --namespace oslo.log --output-file etc/agent.conf.sample
        
        
        Bandwidth limitation (Trickle)
        ------------------------------
        
        Trickle for bandwidth limiting (How it works ):
        
        We have 3 cases to handle:
        
        1. User used ``--upload-limit`` or ``--download-limit`` from the CLI
        2. User used configuration files to execute an action
        3. A combination of both of these options.
        
        User used --upload-limit or -download-limit from the CLI
        ========================================================
        We need to remove these limits from the cli arguments and then run trickle
        using subprocess
        
        EX::
        
            # freezer-agent --action backup -F /etc/ -C freezer --upload-limit = 1k
        
        this will be translated to::
        
            # trickle -u 1024 -d -1 freezer-agent --action backup -F /etc/ -C freezer
        
        User used config files to execute an action
        ===========================================
        
        We need to create a new config file without the limits So we will get the all
        the arguments provided and remove limits then run trickle using subprocess
        
        EX: We have a config file contains::
        
            [default]
            action = backup
            storage = ssh
            ssh_host = 127.0.0.1
            ssh_username = saad
            ssh_key = /home/saad/.ssh/saad
            container = /home/saad/backups_freezers
            backup_name = freezer_jobs
            path_to_backup = /etc
            upload_limit=2k
            download_limit=1k
        
        and we are going to execute this job as follow::
        
            freezer-agent --config /home/user/job1.ini
        
        this will be translated to::
        
            trickle -u 2048 -d 1024 freezer-agent --config /tmp/freezer_job_x21aj29
        
        The new config file has the following arguments::
        
            [default]
            action = backup
            storage = ssh
            ssh_host = 127.0.0.1
            ssh_username = saad
            ssh_key = /home/saad/.ssh/saad
            container = /home/saad/backups_freezers
            backup_name = freezer_jobs
            path_to_backup = /etc
        
        Hybrid approach using config file and CLI options
        =================================================
        
        We will use a mix of both procedures:
        
        * remove limits (cli or config )
        * reproduce the same command again with trickle
        
        EX::
        
         $ freezer-agent --config /home/user/job2.ini --upload-limit 1k
        
        The Freezer logo is released under the licence Attribution 3.0 Unported (CC BY3.0).
        
        
Keywords: freezer
backup
openstack
restore
disaster recovery
lvm
snapshot
mongodb
mysql
Platform: UNKNOWN
Classifier: Programming Language :: Python
Classifier: Development Status :: 5 - Production/Stable
Classifier: Natural Language :: English
Classifier: Environment :: OpenStack
Classifier: Intended Audience :: Developers
Classifier: Intended Audience :: Information Technology
Classifier: Intended Audience :: System Administrators
Classifier: License :: OSI Approved :: Apache Software License
Classifier: Operating System :: MacOS
Classifier: Operating System :: POSIX :: BSD :: FreeBSD
Classifier: Operating System :: POSIX :: BSD :: NetBSD
Classifier: Operating System :: POSIX :: BSD :: OpenBSD
Classifier: Operating System :: POSIX :: Linux
Classifier: Operating System :: Microsoft :: Windows
Classifier: Operating System :: Unix
Classifier: Topic :: System :: Archiving :: Backup
Classifier: Topic :: System :: Archiving :: Compression
Classifier: Topic :: System :: Archiving
