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Add a 'kubeadm config print-default' command

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This commit is contained in:
Lucas Käldström 2018-05-17 16:19:26 +01:00
parent 3ceab591bc
commit 215184b923
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1 changed files with 67 additions and 0 deletions
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67
cmd/kubeadm/app/cmd/config.go
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@ -42,6 +42,14 @@ import (
utilsexec "k8s.io/utils/exec"
)
const (
masterConfig = "MasterConfiguration"
nodeConfig = "NodeConfiguration"
sillyToken = "abcdef.0123456789abcdef"
)
var availableAPIObjects = []string{masterConfig, nodeConfig}
// NewCmdConfig returns cobra.Command for "kubeadm config" command
func NewCmdConfig(out io.Writer) *cobra.Command {
@ -65,12 +73,71 @@ func NewCmdConfig(out io.Writer) *cobra.Command {
cmd.PersistentFlags().StringVar(&kubeConfigFile, "kubeconfig", "/etc/kubernetes/admin.conf", "The KubeConfig file to use when talking to the cluster.")
cmd.AddCommand(NewCmdConfigPrintDefault(out))
cmd.AddCommand(NewCmdConfigUpload(out, &kubeConfigFile))
cmd.AddCommand(NewCmdConfigView(out, &kubeConfigFile))
cmd.AddCommand(NewCmdConfigImages(out))
return cmd
}
// NewCmdConfigPrintDefault returns cobra.Command for "kubeadm config print-default" command
func NewCmdConfigPrintDefault(out io.Writer) *cobra.Command {
apiObjects := []string{}
cmd := &cobra.Command{
Use: "print-default",
Aliases: []string{"print-defaults"},
Short: "Print the default values for a kubeadm configuration object.",
Long: fmt.Sprintf(dedent.Dedent(`
This command prints the default MasterConfiguration object that is used for 'kubeadm init' and 'kubeadm upgrade',
and the default NodeConfiguration object that is used for 'kubeadm join'.
Note that sensitive values like the Bootstrap Token fields are replaced with silly values like %q in order to pass validation but
not perform the real computation for creating a token.
`), sillyToken),
Run: func(cmd *cobra.Command, args []string) {
if len(apiObjects) == 0 {
apiObjects = availableAPIObjects
}
for i, apiObject := range apiObjects {
if i > 0 {
fmt.Fprintln(out, "---")
}
cfgBytes, err := getDefaultAPIObjectBytes(apiObject)
kubeadmutil.CheckErr(err)
// Print the API object byte array
fmt.Fprintf(out, "%s", cfgBytes)
}
},
}
cmd.Flags().StringSliceVar(&apiObjects, "api-objects", apiObjects,
fmt.Sprintf("A comma-separated list for API objects to print the default values for. Available values: %v. This flag unset means 'print all known objects'", availableAPIObjects))
return cmd
}
func getDefaultAPIObjectBytes(apiObject string) ([]byte, error) {
if apiObject == masterConfig {
internalcfg, err := configutil.ConfigFileAndDefaultsToInternalConfig("", &kubeadmapiv1alpha2.MasterConfiguration{
Token: sillyToken,
})
kubeadmutil.CheckErr(err)
return kubeadmutil.MarshalToYamlForCodecs(internalcfg, kubeadmapiv1alpha2.SchemeGroupVersion, kubeadmscheme.Codecs)
}
if apiObject == nodeConfig {
internalcfg, err := configutil.NodeConfigFileAndDefaultsToInternalConfig("", &kubeadmapiv1alpha2.NodeConfiguration{
Token: sillyToken,
DiscoveryTokenAPIServers: []string{"kube-apiserver:6443"},
DiscoveryTokenUnsafeSkipCAVerification: true,
})
kubeadmutil.CheckErr(err)
return kubeadmutil.MarshalToYamlForCodecs(internalcfg, kubeadmapiv1alpha2.SchemeGroupVersion, kubeadmscheme.Codecs)
}
return []byte{}, fmt.Errorf("--api-object needs to be one of %v", availableAPIObjects)
}
// NewCmdConfigUpload returns cobra.Command for "kubeadm config upload" command
func NewCmdConfigUpload(out io.Writer, kubeConfigFile *string) *cobra.Command {
cmd := &cobra.Command{