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Image Manager

The OpenStack Image Manager is a tool for managing all images on an OpenStack environment

Requirements

This information is only relevant for the operator of an OpenStack environment. You can skip this section if you want to use OpenStack Image Manager as a normal user and you are not an operator of an openStack environment.

OpenStack Image Service (Glance)

The OpenStack Image Service (Glance) is required to upload and discover data assets that are used by other services.

Since this script stores many images in a single project, the Glance quota must be set accordingly high or to unlimited.

[DEFAULT]
user_storage_quota = 1TB

With most storage backends it makes sense to convert the imported images directly to RAW. So it is required for using Ceph and it's features too. Recited from the Ceph documentation QEMU and block devices and Block devices and OpenStack.

info

The raw data format is really the only sensible format option to use with RBD. Technically, you could use other QEMU-supported formats (such as qcow2 or vmdk), but doing so would add additional overhead, and would also render the volume unsafe for virtual machine live migration when caching (see below) is enabled.

Important Ceph doesn't support QCOW2 for hosting a virtual machine disk. Thus if you want to boot virtual machines in Ceph (ephemeral backend or boot from volume), the Glance image format must be RAW.

See the OpenStack Glance documentation for more details.

This requires the following parameter for the image import workflow.

[taskflow_executor]
conversion_format = raw

[image_import_opts]
image_import_plugins = ['image_decompression', 'image_conversion']

[image_conversion]
output_format = raw

Object storage backend

If the mirror functionality is used, an object storage backend is required. The use of the mirror functionality is optional and is not used by default.

Getting started

This Getting started will upload a private image to your OpenStack environment with the help of the OpenStack Image Manager.

  1. Install the openstack-image-manager package with pip.

    pip3 install openstack-image-manager
  2. Create a image definition in the file getting-started.yml in the local directory images.

    ---
    images:
    - name: MyCirros
    format: qcow2
    login: cirros
    password: gocubsgo
    min_disk: 1
    min_ram: 32
    status: active
    visibility: private
    multi: false
    meta:
    architecture: x86_64
    hw_disk_bus: scsi
    hw_rng_model: virtio
    hw_scsi_model: virtio-scsi
    hw_watchdog_action: reset
    os_distro: cirros
    replace_frequency: never
    uuid_validity: none
    provided_until: none
    tags: []
    versions:
    - version: '0.6.0'
    url: https://github.com/cirros-dev/cirros/releases/download/0.6.0/cirros-0.6.0-x86_64-disk.img
    checksum: "sha256:94e1e2c94dbbae7d4bdc38e68590a1daf73c9de2d03dd693857b4b0a042548e8"
    build_date: 2022-09-28
  3. Run the OpenStack Image Manager. It is assumed that a profile with the name openstack exists in the clouds.yaml.

    openstack-image-manager --cloud openstack --filter ".*Cirr.*" --images images/

Image definitions

The configuration consists of different parameter settings, such as values for minimum RAM or the visibility of the image. Have a look at the examples below for all parameters. After a change to the configuration, validate it with tox -- --dry-run.

SCS image standard

  • The value of login is stored as image_original_user in the metadata of an image.
  • If image_description is not set as meta information, image_description is set to the name of the image.
  • The value of build_date of a specific version of an image is stored as image_build_date in the metadata of an image.
  • The value of url of a specific version of an image is stored as image_source in the metadata of an image.

Image with regular rebuilds

This type of image definition is used for images that are rebuilt at regular intervals. For example, this is the case for the daily builds of the Ubuntu images.

The attribute multi: true is set.

With this type of image definition, the version of the distribution (or product, whatever is contained in the image) used is already in the name of the image definition. The version properties from the definition's versions list are appended only to older iterations of the image as timestamp suffixes in parentheses upon each rotation (except for the latest entry).

images:
- name: Ubuntu 16.04
format: qcow2
login: ubuntu
min_disk: 8
min_ram: 512
status: active
visibility: public
multi: true
meta:
architecture: x86_64
hw_disk_bus: scsi
hw_scsi_model: virtio-scsi
hw_watchdog_action: reset
os_distro: ubuntu
os_version: '16.04'
tags: []
versions:
- version: '20180928'
url: https://cloud-images.ubuntu.com/xenial/20180928/xenial-server-cloudimg-amd64-disk1.img
- version: '20181004'
url: https://cloud-images.ubuntu.com/xenial/20181004/xenial-server-cloudimg-amd64-disk1.img

This configuration creates the following images:

  • Ubuntu 16.04 (20180928)
  • Ubuntu 16.04

If a newer build is added, the following rotation takes place:

  • Ubuntu 16.04 (20180928) does not change
  • Ubuntu 16.04 becomes Ubuntu 16.04 (20181004)
  • the new image becomes Ubuntu 16.04

By default the last three images will be visible. When a fourth image is added, the visibility of the last image in the list is changed to community and the image can be deleted in the future.

Image without regular rebuild

This type of image definition is used for images that are not rebuilt. For example, this is the case for the flatcar images. For each release of Flatcar there is exactly one image which will not be rebuilt in the future.

The attribute multi: false is set.

With this type of image definition, the version of the distribution (or product, whatever is contained in the image) used is not in the name of the image definition. Instead, the version properties from the image definition's versions list are appended as static version suffixes to the images' names.

images:
- name: RancherOS
format: qcow2
login: rancher
min_disk: 8
min_ram: 2048
status: active
visibility: public
multi: false
meta:
architecture: x86_64
hw_disk_bus: scsi
hw_scsi_model: virtio-scsi
hw_watchdog_action: reset
tags: []
versions:
- version: '1.3.0'
url: https://github.com/rancher/os/releases/download/v1.3.0/rancheros-openstack.img
- version: '1.4.0'
url: https://github.com/rancher/os/releases/download/v1.4.0/rancheros-openstack.img
- version: '1.4.1'
url: https://github.com/rancher/os/releases/download/v1.4.1/rancheros-openstack.img

This configuration creates the following images:

  • RancherOS 1.3.0
  • RancherOS 1.4.0
  • RancherOS 1.4.1

If a new version is added, no rotation takes place. The new version is added as RancherOS x.y.z. Here also the visibility of older images is not changed.

Other properties

Image properties

  • Removal of properties is not yet possible
  • URL, name and format can not be changed
  • Any keys can be added to meta, these will be added to the image
  • Existing keys in meta can be changed, the same applies to min_disk and min_ram

Image tags

image status

  • deactivation: change status to deactivated
  • reactivation: change status to active

Image visibility

A full documentation about the visibility of images can be found in the Image visibility section in the OpenStack Image Service API Documentation.

  • public: set visibility to public
  • community: set visibility to community
  • shared: set visibility to shared
  • private: set visibility to private

Usage

Mirroring images

Since the upstreams often only keep their images for a short time, we mirror most of the images on REGIO.cloud. This makes us independent of the availability of the images in the individual upstreams.

Updating images

Some of the images are automatically updated by a CI job. The latest available build at the time of the CI job execution is mirrored and made available as the current version.

Currently, the following images are updated once a week (every Sunday at 0 am):

  • Almalinux
  • CentOS
  • Debian
  • Rockylinux
  • Ubuntu