// joinFederation is the implementation of the `join federation` command.
func joinFederation(f cmdutil.Factory, cmdOut io.Writer, config util.AdminConfig, cmd *cobra.Command, args []string) error {
joinFlags, err := util.GetSubcommandFlags(cmd, args)
if err != nil {
return err
}
dryRun := cmdutil.GetDryRunFlag(cmd)
glog.V(2).Infof("Args and flags: name %s, host: %s, host-system-namespace: %s, kubeconfig: %s, dry-run: %s", joinFlags.Name, joinFlags.Host, joinFlags.FederationSystemNamespace, joinFlags.Kubeconfig, dryRun)
po := config.PathOptions()
po.LoadingRules.ExplicitPath = joinFlags.Kubeconfig
clientConfig, err := po.GetStartingConfig()
if err != nil {
return err
}
generator, err := clusterGenerator(clientConfig, joinFlags.Name)
if err != nil {
glog.V(2).Infof("Failed creating cluster generator: %v", err)
return err
}
glog.V(2).Infof("Created cluster generator: %#v", generator)
hostFactory := config.HostFactory(joinFlags.Host, joinFlags.Kubeconfig)
// We are not using the `kubectl create secret` machinery through
// `RunCreateSubcommand` as we do to the cluster resource below
// because we have a bunch of requirements that the machinery does
// not satisfy.
// 1. We want to create the secret in a specific namespace, which
// is neither the "default" namespace nor the one specified
// via the `--namespace` flag.
// 2. `SecretGeneratorV1` requires LiteralSources in a string-ified
// form that it parses to generate the secret data key-value
// pairs. We, however, have the key-value pairs ready without a
// need for parsing.
// 3. The result printing mechanism needs to be mostly quiet. We
// don't have to print the created secret in the default case.
// Having said that, secret generation machinery could be altered to
// suit our needs, but it is far less invasive and readable this way.
_, err = createSecret(hostFactory, clientConfig, joinFlags.FederationSystemNamespace, joinFlags.Name, dryRun)
if err != nil {
glog.V(2).Infof("Failed creating the cluster credentials secret: %v", err)
return err
}
glog.V(2).Infof("Cluster credentials secret created")
return kubectlcmd.RunCreateSubcommand(f, cmd, cmdOut, &kubectlcmd.CreateSubcommandOptions{
Name: joinFlags.Name,
StructuredGenerator: generator,
DryRun: dryRun,
OutputFormat: cmdutil.GetFlagString(cmd, "output"),
})
}
func updateKubeconfig(config util.AdminConfig, name, endpoint string, entKeyPairs *entityKeyPairs, dryRun bool) error {
po := config.PathOptions()
kubeconfig, err := po.GetStartingConfig()
if err != nil {
return err
}
// Populate API server endpoint info.
cluster := clientcmdapi.NewCluster()
// Prefix "https" as the URL scheme to endpoint.
if !strings.HasPrefix(endpoint, "https://") {
endpoint = fmt.Sprintf("https://%s", endpoint)
}
cluster.Server = endpoint
cluster.CertificateAuthorityData = certutil.EncodeCertPEM(entKeyPairs.ca.Cert)
// Populate credentials.
authInfo := clientcmdapi.NewAuthInfo()
authInfo.ClientCertificateData = certutil.EncodeCertPEM(entKeyPairs.admin.Cert)
authInfo.ClientKeyData = certutil.EncodePrivateKeyPEM(entKeyPairs.admin.Key)
authInfo.Username = AdminCN
// Populate context.
context := clientcmdapi.NewContext()
context.Cluster = name
context.AuthInfo = name
// Update the config struct with API server endpoint info,
// credentials and context.
kubeconfig.Clusters[name] = cluster
kubeconfig.AuthInfos[name] = authInfo
kubeconfig.Contexts[name] = context
if !dryRun {
// Write the update kubeconfig.
if err := clientcmd.ModifyConfig(po, *kubeconfig, true); err != nil {
return err
}
}
return nil
}