Swift Storage

  • By OpenStack Charmers
  • Cloud
Channel Revision Published Runs on
latest/edge 520 01 Apr 2024
Ubuntu 22.04
yoga/stable 518 10 Jan 2024
Ubuntu 22.04 Ubuntu 20.04
zed/stable 521 04 Apr 2024
Ubuntu 22.10 Ubuntu 22.04
xena/stable 522 04 Apr 2024
Ubuntu 20.04
wallaby/stable 497 23 Jan 2023
Ubuntu 20.04
victoria/stable 498 23 Jan 2023
Ubuntu 20.04
ussuri/stable 496 23 Jan 2023
Ubuntu 20.04 Ubuntu 18.04
train/candidate 492 28 Nov 2022
Ubuntu 18.04
train/edge 495 16 Jan 2023
Ubuntu 18.04
stein/candidate 492 28 Nov 2022
Ubuntu 18.04
stein/edge 495 16 Jan 2023
Ubuntu 18.04
rocky/candidate 492 28 Nov 2022
Ubuntu 18.04
rocky/edge 495 16 Jan 2023
Ubuntu 18.04
queens/candidate 492 28 Nov 2022
Ubuntu 18.04
queens/edge 495 16 Jan 2023
Ubuntu 18.04
2024.1/candidate 523 Today
Ubuntu 22.04
2023.2/stable 516 05 Dec 2023
Ubuntu 23.10 Ubuntu 22.04
2023.1/stable 519 25 Mar 2024
Ubuntu 23.04 Ubuntu 22.10 Ubuntu 22.04
juju deploy swift-storage --channel yoga/stable
Show information


22.04 20.04


OpenStack Swift is a highly available, distributed, eventually consistent object/blob store.

The swift-storage charm deploys Swift’s storage component. The charm’s basic function is to initialise storage devices and manage the container, object, and account services. It works in tandem with the swift-proxy charm, which is used to add proxy nodes.

Important: This documentation supports version 3.x of the Juju client. See the OpenStack Charm guide if you are using the 2.9.x client.



This section covers common configuration options. See file config.yaml for the full list of options, along with their descriptions and default values.


The zone option assigns a storage zone (an integer) to a storage node. A zone is associated with data replicas.


The block-device option specifies the device(s) that will be used on all machines associated with the application. Value types include:

  • an actual block device (e.g. ‘sdb’ or ‘/dev/sdb’). A space-separated list is used for multiple devices.
  • a path to a local file with the size appended after a pipe (e.g. ‘/etc/swift/storagedev1.img|5G’). The file will be created if necessary and be mapped to a loopback device. This is intended for development and testing purposes.

The resulting block device(s) will be XFS-formatted and use /srv/node/<device-name> as a mount point.


The storage-region option specifies a storage region (an integer). It is used only for multi-region (global) clusters.


Let file swift.yaml contain the deployment configuration:

        zone-assignment: manual
        replicas: 3
        zone: 1
        block-device: /dev/sdb
        zone: 2
        block-device: /dev/sdb
        zone: 3
        block-device: /dev/sdb

Deploy the proxy and storage nodes:

juju deploy --config swift.yaml swift-proxy
juju deploy --config swift.yaml swift-storage swift-storage-zone1
juju deploy --config swift.yaml swift-storage swift-storage-zone2
juju deploy --config swift.yaml swift-storage swift-storage-zone3

Add relations between the proxy node and all storage nodes:

juju integrate swift-proxy:swift-storage swift-storage-zone1:swift-storage
juju integrate swift-proxy:swift-storage swift-storage-zone2:swift-storage
juju integrate swift-proxy:swift-storage swift-storage-zone3:swift-storage

This will result in a three-zone cluster, with each zone consisting of a single storage node, thereby satisfying the replica requirement of three.

Storage capacity is increased by adding swift-storage units to a zone. For example, to add two storage nodes to zone ‘3’:

juju add-unit -n 2 swift-storage-zone3

Note: When scaling out ensure the candidate machines are equipped with the block devices currently configured for the associated application.

This charm will not balance the storage ring until there are enough storage zones to meet its minimum replica requirement, in this case three.

Appendix Swift usage in the OpenStack Charms Deployment Guide offers in-depth guidance for deploying Swift with charms. In particular, it shows how to set up a multi-region (global) cluster.


This section covers Juju actions supported by the charm. Actions allow specific operations to be performed on a per-unit basis.

  • openstack-upgrade
  • pause
  • resume

To display action descriptions run juju actions swift-storage.


Please report bugs on Launchpad.

For general charm questions refer to the OpenStack Charm Guide.

Help improve this document in the forum (guidelines). Last updated 8 months ago.