Swift - Object storage service¶
Overview¶
Kolla can deploy a full working Swift setup in either a all-in-one or multinode setup.
Networking¶
The following networks are used by Swift:
- External API network (
kolla_external_vip_interface
) This network is used by users to access the Swift public API.
- Internal API network (
api_interface
) This network is used by users to access the Swift internal API. It is also used by HAProxy to access the Swift proxy servers.
- Swift Storage network (
swift_storage_interface
) This network is used by the Swift proxy server to access the account, container and object servers. Defaults to
storage_interface
.- Swift replication network (
swift_replication_network
) This network is used for Swift storage replication traffic. This is optional as the default configuration uses the
swift_storage_interface
for replication traffic.
Disks with a partition table (recommended)¶
Swift requires block devices to be available for storage. To prepare a disk for use as a Swift storage device, a special partition name and filesystem label need to be added.
The following should be done on each storage node, the example is shown for three disks:
Warning
ALL DATA ON DISK will be LOST!
index=0
for d in sdc sdd sde; do
parted /dev/${d} -s -- mklabel gpt mkpart KOLLA_SWIFT_DATA 1 -1
sudo mkfs.xfs -f -L d${index} /dev/${d}1
(( index++ ))
done
For evaluation, loopback devices can be used in lieu of real disks:
index=0
for d in sdc sdd sde; do
free_device=$(losetup -f)
fallocate -l 1G /tmp/$d
losetup $free_device /tmp/$d
parted $free_device -s -- mklabel gpt mkpart KOLLA_SWIFT_DATA 1 -1
sudo mkfs.xfs -f -L d${index} ${free_device}p1
(( index++ ))
done
Disks without a partition table¶
Kolla also supports unpartitioned disk (filesystem on /dev/sdc
instead of
/dev/sdc1
) detection purely based on filesystem label. This is generally
not a recommended practice but can be helpful for Kolla to take over Swift
deployment already using disk like this.
Given hard disks with labels swd1, swd2, swd3, use the following settings in
ansible/roles/swift/defaults/main.yml
.
swift_devices_match_mode: "prefix"
swift_devices_name: "swd"
Rings¶
Before running Swift we need to generate rings, which are binary compressed files that at a high level let the various Swift services know where data is in the cluster. We hope to automate this process in a future release.
The following example commands should be run from the operator
node to
generate rings for a demo setup. The commands work with disks with partition
table example listed above. Please modify accordingly if your setup is
different.
If using a separate replication network it is necessary to add the replication network IP addresses to the rings. See the Swift documentation for details on how to do that.
Prepare for Rings generating¶
To prepare for Swift Rings generating, run the following commands to initialize
the environment variable and create /etc/kolla/config/swift
directory:
STORAGE_NODES=(192.168.0.2 192.168.0.3 192.168.0.4)
KOLLA_SWIFT_BASE_IMAGE="kolla/centos-source-swift-base:4.0.0"
mkdir -p /etc/kolla/config/swift
Generate Object Ring¶
To generate Swift object ring, run the following commands:
docker run \
--rm \
-v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
$KOLLA_SWIFT_BASE_IMAGE \
swift-ring-builder \
/etc/kolla/config/swift/object.builder create 10 3 1
for node in ${STORAGE_NODES[@]}; do
for i in {0..2}; do
docker run \
--rm \
-v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
$KOLLA_SWIFT_BASE_IMAGE \
swift-ring-builder \
/etc/kolla/config/swift/object.builder add r1z1-${node}:6000/d${i} 1;
done
done
Generate Account Ring¶
To generate Swift account ring, run the following commands:
docker run \
--rm \
-v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
$KOLLA_SWIFT_BASE_IMAGE \
swift-ring-builder \
/etc/kolla/config/swift/account.builder create 10 3 1
for node in ${STORAGE_NODES[@]}; do
for i in {0..2}; do
docker run \
--rm \
-v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
$KOLLA_SWIFT_BASE_IMAGE \
swift-ring-builder \
/etc/kolla/config/swift/account.builder add r1z1-${node}:6001/d${i} 1;
done
done
Generate Container Ring¶
To generate Swift container ring, run the following commands:
docker run \
--rm \
-v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
$KOLLA_SWIFT_BASE_IMAGE \
swift-ring-builder \
/etc/kolla/config/swift/container.builder create 10 3 1
for node in ${STORAGE_NODES[@]}; do
for i in {0..2}; do
docker run \
--rm \
-v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
$KOLLA_SWIFT_BASE_IMAGE \
swift-ring-builder \
/etc/kolla/config/swift/container.builder add r1z1-${node}:6002/d${i} 1;
done
done
Rebalance¶
To rebalance the ring files:
for ring in object account container; do
docker run \
--rm \
-v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
$KOLLA_SWIFT_BASE_IMAGE \
swift-ring-builder \
/etc/kolla/config/swift/${ring}.builder rebalance;
done
For more information, see the Swift documentation.
Deploying¶
Enable Swift in /etc/kolla/globals.yml
:
enable_swift : "yes"
If you are to deploy multiple policies, override the variable
swift_extra_ring_files
with the list of your custom ring files, .builder
and .ring.gz all together. This will append them to the list of default rings.
swift_extra_ring_files:
- object-1.builder
- object-1.ring.gz
Once the rings are in place, deploying Swift is the same as any other Kolla Ansible service:
# kolla-ansible deploy -i <path/to/inventory-file>
Verification¶
A very basic smoke test:
$ openstack container create mycontainer
+---------------------------------------+--------------+------------------------------------+
| account | container | x-trans-id |
+---------------------------------------+--------------+------------------------------------+
| AUTH_7b938156dba44de7891f311c751f91d8 | mycontainer | txb7f05fa81f244117ac1b7-005a0e7803 |
+---------------------------------------+--------------+------------------------------------+
$ openstack object create mycontainer README.rst
+---------------+--------------+----------------------------------+
| object | container | etag |
+---------------+--------------+----------------------------------+
| README.rst | mycontainer | 2634ecee0b9a52ba403a503cc7d8e988 |
+---------------+--------------+----------------------------------+
$ openstack container show mycontainer
+--------------+---------------------------------------+
| Field | Value |
+--------------+---------------------------------------+
| account | AUTH_7b938156dba44de7891f311c751f91d8 |
| bytes_used | 6684 |
| container | mycontainer |
| object_count | 1 |
+--------------+---------------------------------------+
$ openstack object store account show
+------------+---------------------------------------+
| Field | Value |
+------------+---------------------------------------+
| Account | AUTH_7b938156dba44de7891f311c751f91d8 |
| Bytes | 6684 |
| Containers | 1 |
| Objects | 1 |
+------------+---------------------------------------+
S3 API¶
The Swift S3 API can be enabled by setting enable_swift_s3api
to true
in globals.yml
. It is disabled by default. In order to use this API it is
necessary to obtain EC2 credentials from Keystone. See the the
Swift documentation for
details.
Swift Recon¶
Enable Swift Recon in /etc/kolla/globals.yml
:
enable_swift_recon : "yes"
The Swift role in Kolla Ansible is still using the old role format. Unlike many other Kolla Ansible roles, it won’t automatically add the new volume to the containers in existing deployments when running kolla-ansible reconfigure. Instead we must use the kolla-ansible upgrade command, which will remove the existing containers and then put them back again.
Example usage:
$ sudo docker exec swift_object_server swift-recon --all`
For more information, see the Swift documentation.