ceph: add ceph_require_min_compat_client default variable#284
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This was referenced May 24, 2026
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Add two variables to the new cluster policy section of all/099-ceph.yml: ceph_require_min_compat_client (default: mimic) — passed to `ceph osd set-require-min-compat-client` by container-image-ceph-ansible during the ceph-pools lifecycle step. With mimic or newer, RBD clone v2 is enabled cluster-wide: parent snapshots no longer need to be protected for clones to reference them, which allows Glance to delete images that have active Nova ephemeral disk clones (HTTP 409 fix). Set to '' to skip; see operator documentation for side effects on production clusters (client lockout, Ceph trash semantics, one-way change). ceph_min_compat_client_order — integer ordering map for release names, used by container-image-ceph-ansible for the idempotency check: the minimum is only raised, never lowered. Extend when new Ceph releases are supported. AI-assisted: Claude Code Signed-off-by: Roger Luethi <luethi@osism.tech>
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Reverts commit 621a279 (PR #2885), which excluded both ImageDependencyTests as a workaround for the HTTP 409 failure caused by the Glance/Ceph RBD clone v1 incompatibility. The root cause is fixed by: - osism/defaults#284 — adds ceph_require_min_compat_client default - osism/container-image-ceph-ansible#690 — applies it via ceph-pools Merge this commit after both of the above are in. Related: #2884 AI-assisted: Claude Code Signed-off-by: Roger Luethi <luethi@osism.tech>
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Reverts commit 621a279 (PR #2885), which excluded both ImageDependencyTests as a workaround for the HTTP 409 failure caused by the Glance/Ceph RBD clone v1 incompatibility. The root cause is fixed by: - osism/defaults#284 — adds ceph_require_min_compat_client default - osism/container-image-ceph-ansible#690 — applies it via ceph-pools Merge this commit after both of the above are in. Related: #2884 AI-assisted: Claude Code Signed-off-by: Roger Luethi <luethi@osism.tech>
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Summary
ceph_require_min_compat_client(default:mimic) toall/099-ceph.ymlunder a new# cluster policysectionceph_min_compat_client_order— an integer ordering map of Ceph release names used bycontainer-image-ceph-ansiblefor the idempotency check (only raise, never lower)The variable is consumed by
container-image-ceph-ansibleduring theceph-poolslifecycle step to runceph osd set-require-min-compat-client. Withmimicor newer, RBD clone v2 is enabled cluster-wide: parent snapshots no longer need to be protected, so Glance can delete images that have active Nova ephemeral disk clones (fixes HTTP 409).See
osism/container-image-ceph-ansiblefor the companion PR that reads this variable and applies it.Side effects of raising require-min-compat-client to mimic (documented in the variable's comment):
Set to
''to skip if the cluster must remain at luminous compat level.Test plan
container-image-ceph-ansibletested end-to-end in bedbox: bothImageDependencyTestspassexclude.lstentries (testbed PR #2885) reverted once the full fix is confirmed in CI🤖 Generated with Claude Code