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bump default Flatcar Azure image to 4459.2.3 for containerd v2 support#2021

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fix/azure-flatcar-containerd-v2-image
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bump default Flatcar Azure image to 4459.2.3 for containerd v2 support#2021
buraksekili wants to merge 2 commits into
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fix/azure-flatcar-containerd-v2-image

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@buraksekili buraksekili commented May 18, 2026

The previous default 4230.2.2 ships containerd v1.7.23, which rejects the v3 config format OSM generates and leaves nodes stuck in a setup crash loop.

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

What type of PR is this?

/kind feature

Special notes for your reviewer:

Does this PR introduce a user-facing change? Then add your Release Note here:

Azure: upgrade Flatcar to version `4459.2.3`

Documentation:

NONE

The previous default 4230.2.2 ships containerd v1.7.23, which rejects
the v3 config format OSM generates and leaves nodes stuck in a setup
crash loop. Flatcar Stable 4593.2.1 ships containerd v2.1.5 and matches
the config OSM produces.

Signed-off-by: Burak Sekili <32663655+buraksekili@users.noreply.github.com>
@kubermatic-bot kubermatic-bot added do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. do-not-merge/docs-needed Indicates that a PR should not merge because it's missing one of the documentation labels. do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. dco-signoff: yes Denotes that all commits in the pull request have the valid DCO signoff message. sig/cluster-management Denotes a PR or issue as being assigned to SIG Cluster Management. labels May 18, 2026
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[APPROVALNOTIFIER] This PR is NOT APPROVED

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@kubermatic-bot kubermatic-bot added the size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. label May 18, 2026
Signed-off-by: Burak Sekili <32663655+buraksekili@users.noreply.github.com>
@kubermatic-bot kubermatic-bot added size/M Denotes a PR that changes 30-99 lines, ignoring generated files. and removed size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. labels May 18, 2026
@buraksekili buraksekili force-pushed the fix/azure-flatcar-containerd-v2-image branch from 1c3e40f to aa4185d Compare May 18, 2026 14:59
@kubermatic-bot kubermatic-bot added size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. and removed size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels May 18, 2026
@buraksekili buraksekili changed the title WIP: bump default Flatcar Azure image to 4593.2.1 for containerd v2 support bump default Flatcar Azure image to 4459.2.3 for containerd v2 support May 18, 2026
@kubermatic-bot kubermatic-bot added release-note Denotes a PR that will be considered when it comes time to generate release notes. docs/none Denotes a PR that doesn't need documentation (changes). and removed do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. do-not-merge/docs-needed Indicates that a PR should not merge because it's missing one of the documentation labels. labels May 18, 2026
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@buraksekili: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name Commit Details Required Rerun command
pull-machine-controller-e2e-azure-custom-image-reference aa4185d link true /test pull-machine-controller-e2e-azure-custom-image-reference
pull-machine-controller-e2e-azure aa4185d link true /test pull-machine-controller-e2e-azure

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