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kubeadm: speedup init by 0s or 20s

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Before this commit, kubeadm starts kubelet before it creates
/etc/kubernetes/manifests. On boot, kubelet tries to load the
static pod manifests from this dir by calling `listConfig()`
7ad8303b96/pkg/kubelet/config/file.go (L97)
and it'll then try to start a file watcher every second for 20s
7ad8303b96/pkg/kubelet/config/file.go (L114)
7ad8303b96/pkg/kubelet/config/file_linux.go (L51-L67)

If kubelet starts and calls `listConfig()` before kubeadm creates
`/etc/kubernetes/manifests` (while writing the static pods manifests),
the file watcher will be created less than a second after, but there
will be no changes to report, so the manifests will only be detected
on the next tick of `listTicker`, a bit less than 20s later
7ad8303b96/pkg/kubelet/config/file.go (L102-L103)

Even if we fixed the watch code to `listConfig()` just after starting the
inotify watch, watching source file is only supported on linux,
so moving the manifests generation before kubelet start fixes all
cases and make more sense IMO.

Signed-off-by: Etienne Champetier <e.champetier@ateme.com>
This commit is contained in:
Etienne Champetier 2023-05-12 14:42:35 -04:00
parent 53636bc780
commit 19ae2de19c
1 changed files with 2 additions and 2 deletions
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4
cmd/kubeadm/app/cmd/init.go
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@ -134,9 +134,9 @@ func newCmdInit(out io.Writer, initOptions *initOptions) *cobra.Command {
initRunner.AppendPhase(phases.NewPreflightPhase())
initRunner.AppendPhase(phases.NewCertsPhase())
initRunner.AppendPhase(phases.NewKubeConfigPhase())
initRunner.AppendPhase(phases.NewKubeletStartPhase())
initRunner.AppendPhase(phases.NewControlPlanePhase())
initRunner.AppendPhase(phases.NewEtcdPhase())
initRunner.AppendPhase(phases.NewControlPlanePhase())
initRunner.AppendPhase(phases.NewKubeletStartPhase())
initRunner.AppendPhase(phases.NewWaitControlPlanePhase())
initRunner.AppendPhase(phases.NewUploadConfigPhase())
initRunner.AppendPhase(phases.NewUploadCertsPhase())