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kubeadm: make the CP join handling of kubeconfig similar to "init"

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The kubeconfig phase of "kubeadm init" detects external CA mode
and skips the generation of kubeconfig files. The kubeconfig
handling during control-plane join executes
CreateJoinControlPlaneKubeConfigFiles() which requires the presence
of ca.key when preparing the spec of a kubeconfig file and prevents
usage of external CA mode.

Modify CreateJoinControlPlaneKubeConfigFiles() to skip generating
the kubeconfig files if external CA mode is detected.
This commit is contained in:
Lubomir I. Ivanov 2020-09-23 04:18:29 +03:00
parent 05b77fe99f
commit 7c783fa374
1 changed files with 21 additions and 5 deletions
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26
cmd/kubeadm/app/phases/kubeconfig/kubeconfig.go
View File

@ -67,15 +67,31 @@ type kubeConfigSpec struct {
// CreateJoinControlPlaneKubeConfigFiles will create and write to disk the kubeconfig files required by kubeadm
// join --control-plane workflow, plus the admin kubeconfig file used by the administrator and kubeadm itself; the
// kubelet.conf file must not be created because it will be created and signed by the kubelet TLS bootstrap process.
// If any kubeconfig files already exists, it used only if evaluated equal; otherwise an error is returned.
// When not using external CA mode, if a kubeconfig file already exists it is used only if evaluated equal,
// otherwise an error is returned. For external CA mode, the creation of kubeconfig files is skipped.
func CreateJoinControlPlaneKubeConfigFiles(outDir string, cfg *kubeadmapi.InitConfiguration) error {
return createKubeConfigFiles(
outDir,
cfg,
var externaCA bool
caKeyPath := filepath.Join(cfg.CertificatesDir, kubeadmconstants.CAKeyName)
if _, err := os.Stat(caKeyPath); os.IsNotExist(err) {
externaCA = true
}
files := []string{
kubeadmconstants.AdminKubeConfigFileName,
kubeadmconstants.ControllerManagerKubeConfigFileName,
kubeadmconstants.SchedulerKubeConfigFileName,
)
}
for _, file := range files {
if externaCA {
fmt.Printf("[kubeconfig] External CA mode: Using user provided %s\n", file)
continue
}
if err := createKubeConfigFiles(outDir, cfg, file); err != nil {
return err
}
}
return nil
}
// CreateKubeConfigFile creates a kubeconfig file.