Sahara Installation Guide

We recommend installing sahara in a way that will keep your system in a consistent state. We suggest the following options:

  • Install via Fuel
  • Install via RDO
  • Install into a virtual environment

To install with Fuel

  1. Start by following the MOS Quickstart to install and setup OpenStack.
  2. Enable the sahara service during installation.

To install with RDO

  1. Start by following the RDO Quickstart to install and setup OpenStack.
  2. Install sahara:
# yum install openstack-sahara
  1. Configure sahara as needed. The configuration file is located in /etc/sahara/sahara.conf. For details see Sahara Configuration Guide
  2. Create the database schema:
# sahara-db-manage --config-file /etc/sahara/sahara.conf upgrade head
  1. Go through Common installation steps and make any necessary changes.
  2. Start the sahara-api and sahara-engine services:
# systemctl start openstack-sahara-api
# systemctl start openstack-sahara-engine
  1. (Optional) Enable sahara services to start on boot
# systemctl enable openstack-sahara-api
# systemctl enable openstack-sahara-engine

To install into a virtual environment

  1. First you need to install a number of packages with your OS package manager. The list of packages depends on the OS you use. For Ubuntu run:
$ sudo apt-get install python-setuptools python-virtualenv python-dev
For Fedora:
$ sudo yum install gcc python-setuptools python-virtualenv python-devel
For CentOS:
$ sudo yum install gcc python-setuptools python-devel
$ sudo easy_install pip
$ sudo pip install virtualenv
  1. Setup a virtual environment for sahara:
$ virtualenv sahara-venv
This will install a python virtual environment into sahara-venv directory in your current working directory. This command does not require super user privileges and can be executed in any directory where the current user has write permissions.
  1. You can get a sahara archive from http://tarballs.openstack.org/sahara/ and install it using pip:
$ sahara-venv/bin/pip install 'http://tarballs.openstack.org/sahara/sahara-master.tar.gz'
Note that sahara-master.tar.gz contains the latest changes and might not be stable at the moment. We recommend browsing http://tarballs.openstack.org/sahara/ and selecting the latest stable release. For installation just execute (where replace the ‘release’ word with release name, e.g. ‘mitaka’):
$ sahara-venv/bin/pip install 'http://tarballs.openstack.org/sahara/sahara-stable-release.tar.gz'
For example, you can get Sahara Mitaka release by executing:
$ sahara-venv/bin/pip install 'http://tarballs.openstack.org/sahara/sahara-stable-mitaka.tar.gz'
  1. After installation you should create a configuration file from the sample file located in sahara-venv/share/sahara/sahara.conf.sample-basic:
$ mkdir sahara-venv/etc
$ cp sahara-venv/share/sahara/sahara.conf.sample-basic sahara-venv/etc/sahara.conf
Make any necessary changes to sahara-venv/etc/sahara.conf. For details see Sahara Configuration Guide

Common installation steps

The steps below are common to both the RDO and virtual environment installations of sahara.

  1. If you use sahara with a MySQL database, then for storing big job binaries in the sahara internal database you must configure the size of the maximum allowed packet. Edit the my.cnf file and change the max_allowed_packet parameter as follows:
...
[mysqld]
...
max_allowed_packet = 256M
Then restart the mysql server to ensure these changes are active.
  1. Create the database schema:
$ sahara-venv/bin/sahara-db-manage --config-file sahara-venv/etc/sahara.conf upgrade head
  1. Start sahara services from different terminals:
# first terminal
$ sahara-venv/bin/sahara-api --config-file sahara-venv/etc/sahara.conf

# second terminal
$ sahara-venv/bin/sahara-engine --config-file sahara-venv/etc/sahara.conf
  1. For sahara to be accessible in the OpenStack Dashboard and for python-saharaclient to work properly you must register sahara in the Identity service catalog. For example:
openstack service create --name sahara --description \
    "Sahara Data Processing" data-processing

openstack endpoint create --region RegionOne \
--publicurl http://10.0.0.2:8386/v1.1/%\(project_id\)s \
--adminurl http://10.0.0.2:8386/v1.1/%\(project_id\)s \
--internalurl http://10.0.0.2:8386/v1.1/%\(project_id\)s \
data-processing

Note

You have to install the openstack-client package in order to execute openstack command.

  1. For more information on configuring sahara with the OpenStack Dashboard please see OpenStack Dashboard Configuration Guide.

Optional installation of default templates

Sahara bundles default templates that define simple clusters for the supported plugins. These templates may optionally be added to the sahara database using a simple CLI included with sahara.

The default template CLI is described in detail in a README file included with the sahara sources at <sahara_home>/db/templates/README.rst but it is summarized here.

Flavor id values must be specified for the default templates included with sahara. The recommended configuration values below correspond to the m1.medium and m1.large flavors in a default OpenStack installation (if these flavors have been edited, their corresponding values will be different). Values for flavor_id should be added to /etc/sahara/sahara.conf or another configuration file in the sections shown here:

[DEFAULT]
# Use m1.medium for {flavor_id} unless specified in another section
flavor_id = 2

[cdh-5-default-namenode]
# Use m1.large for {flavor_id} in the cdh-5-default-namenode template
flavor_id = 4

[cdh-530-default-namenode]
# Use m1.large for {flavor_id} in the cdh-530-default-namenode template
flavor_id = 4

The above configuration values are included in a sample configuration file at <sahara_home>/plugins/default_templates/template.conf

The command to install all of the default templates is as follows, where $PROJECT_ID should be a valid project id and the above configuration values have been set in myconfig:

$ sahara-templates --config-file /etc/sahara/sahara.conf --config-file myconfig update -t $PROJECT_ID

Help is available from the sahara-templates command:

$ sahara-templates --help
$ sahara-templates update --help

Notes:

Ensure that your operating system is not blocking the sahara port (default: 8386). You may need to configure iptables in CentOS and other Linux distributions to allow this access.

To get the list of all possible options run:

$ sahara-venv/bin/python sahara-venv/bin/sahara-api --help
$ sahara-venv/bin/python sahara-venv/bin/sahara-engine --help

Further, consider reading Getting Started for general sahara concepts and Provisioning Plugins for specific plugin features/requirements.