We use constants.OldestKubernetesVersion for testing the oldest version
and limiting --kubernetes-version when starting the clusters. Our
tradition is testing 6 releases back from current version, but we were
testing 14 release back (1.20.0).
For upgrading containerd to latest version (v2.1.4) we need to upgrade
to a newer release. Upgrade constants.OldestKubernetesVersion to 1.28.0
which seems to pass all tests.
legacyVersion() used in version_upgrade_test.go was 1.26.0. The comment
in file mention that this should be release from the last 6 month. We do
see failures in the relevant tests (TestRunningBinaryUpgrade) in many
builds so I bumped it as well to 1.32.0 (2 releases back from current).
In preload_test.go we tested --kubernetes-version=1.24.4 which is not
compatible with containerd v2. Use legacyVersion() instead so we don't
need to maintain another version.
We had many example of --kubernetes-version in the docs using older
version which are not supported. Replace all example with current
version to minimize future maintenance. We need to automated this later
so updating the version in minikube will also update the examples.
With this change we have 2 places to update kubernetes versions:
- constants.*KubernetesVersion
- legacyVersion()
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