Skip podman purge on Undercloud
With the undercloud using ephemeral Heat, there will be images for ephemeral Heat in the local container storage that do not have any associated containers. Podman purge would delete these images, and they then wouldn't be available for overcloud commands. Instead, skip running the podman purge tasks on the Undercloud. This means that the local container image storage will grow over time. Given the reduced number of services on the undercloud, the storage usage is not as bad as it was previously. However, operators will need to be aware. While "podman image prune" does have a --filter option to preserve images, it does not work in the version of podman in container-tools:3.0. When the needed patch[1] is available, the podman purge tasks can be re-enabled, which would address the issue of growing local storage. [1]a5ad36c65e
[2] https://github.com/containers/podman/pull/10390 Change-Id: Ibd2200aa912960b267a9975571e05665a29e40f0 Signed-off-by: James Slagle <jslagle@redhat.com> (cherry picked from commit7eb280ace8
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@ -68,6 +68,10 @@ parameters:
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additional ordering dependencies for the systemd
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scopes associated to podman containers.
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type: boolean
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deployment_source_hosts:
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default: 'Undercloud'
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type: string
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description: Host or hostgroup that runs the deployment
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conditions:
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insecure_registry_is_empty: {equals : [{get_param: DockerInsecureRegistryAddress}, []]}
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@ -221,19 +225,37 @@ outputs:
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when: pcs_stat.stat.exists
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post_upgrade_tasks:
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# Podman purge tasks are disabled on the undercloud since the ephemeral
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# Heat images need to be kept. When commit
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# https://github.com/containers/podman/commit/a5ad36c65ea07d839fd9bf55a820c8cb9884eed1
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# is available in the podman version used by TripleO, the ephemeral
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# Heat images could be labeled in a way that they could be kept with
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# --fitler, and these tasks could be re-enabled on the undercloud.
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- name: Purge Podman
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when:
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- (step | int) == 3
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- container_cli == 'podman'
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- deployment_source_hosts not in group_names
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include_role:
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name: tripleo_podman
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tasks_from: tripleo_podman_purge.yml
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vars:
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deployment_source_hosts: {get_param: deployment_source_hosts}
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post_update_tasks:
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# Podman purge tasks are disabled on the undercloud since the ephemeral
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# Heat images need to be kept. When commit
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# https://github.com/containers/podman/commit/a5ad36c65ea07d839fd9bf55a820c8cb9884eed1
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# is available in the podman version used by TripleO, the ephemeral
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# Heat images could be labeled in a way that they could be kept with
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# --fitler, and these tasks could be re-enabled on the undercloud.
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- name: Purge Podman
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when:
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- (step | int) == 3
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- container_cli == 'podman'
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- deployment_source_hosts not in group_names
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include_role:
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name: tripleo_podman
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tasks_from: tripleo_podman_purge.yml
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vars:
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deployment_source_hosts: {get_param: deployment_source_hosts}
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@ -0,0 +1,9 @@
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---
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other:
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- |
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"podman image prune" is no longer used on the undercloud to remove unused
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images during the undercloud update/upgrade. With the usage of ephemeral
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Heat, not all images will always be used by running or stopped containers,
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so "podman image prune" should not be used to clean up the local container
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image storage. Images that are no longer being used can still be removed
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individually with "podman rmi".
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