297 lines
12 KiB
Go
297 lines
12 KiB
Go
package cluster
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import (
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"context"
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"github.com/pkg/errors"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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kubeclient "k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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"k8s.io/klog"
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fedv1b1 "sigs.k8s.io/kubefed/pkg/apis/core/v1beta1"
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genericclient "sigs.k8s.io/kubefed/pkg/client/generic"
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"sigs.k8s.io/kubefed/pkg/kubefedctl/util"
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)
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// Following code copied from sigs.k8s.io/kubefed to avoid import collision
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// UnjoinCluster performs all the necessary steps to remove the
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// registration of a cluster from a KubeFed control plane provided the
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// required set of parameters are passed in.
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func unjoinCluster(hostConfig, clusterConfig *rest.Config, kubefedNamespace, hostClusterName, unjoiningClusterName string, forceDeletion, dryRun bool, skipMemberClusterResources bool) error {
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hostClientset, err := util.HostClientset(hostConfig)
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if err != nil {
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klog.V(2).Infof("Failed to get host cluster clientset: %v", err)
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return err
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}
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var clusterClientset *kubeclient.Clientset
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if clusterConfig != nil {
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clusterClientset, err = util.ClusterClientset(clusterConfig)
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if err != nil {
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klog.V(2).Infof("Failed to get unjoining cluster clientset: %v", err)
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if !forceDeletion {
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return err
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}
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}
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}
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client, err := genericclient.New(hostConfig)
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if err != nil {
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klog.V(2).Infof("Failed to get kubefed clientset: %v", err)
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return err
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}
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if clusterClientset != nil && !skipMemberClusterResources {
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err := deleteRBACResources(clusterClientset, kubefedNamespace, unjoiningClusterName, hostClusterName, forceDeletion, dryRun)
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if err != nil {
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if !forceDeletion {
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return err
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}
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klog.V(2).Infof("Failed to delete RBAC resources: %v", err)
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}
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err = deleteFedNSFromUnjoinCluster(hostClientset, clusterClientset, kubefedNamespace, unjoiningClusterName, dryRun)
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if err != nil {
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if !forceDeletion {
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return err
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}
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klog.V(2).Infof("Failed to delete kubefed namespace: %v", err)
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}
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}
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// deletionSucceeded when all operations in deleteRBACResources and deleteFedNSFromUnjoinCluster succeed.
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err = deleteFederatedClusterAndSecret(hostClientset, client, kubefedNamespace, unjoiningClusterName, forceDeletion, dryRun)
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if err != nil {
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return err
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}
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return nil
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}
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// deleteKubeFedClusterAndSecret deletes a federated cluster resource that associates
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// the cluster and secret.
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func deleteFederatedClusterAndSecret(hostClientset kubeclient.Interface, client genericclient.Client,
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kubefedNamespace, unjoiningClusterName string, forceDeletion, dryRun bool) error {
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if dryRun {
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return nil
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}
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klog.V(2).Infof("Deleting kubefed cluster resource from namespace %q for unjoin cluster %q",
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kubefedNamespace, unjoiningClusterName)
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fedCluster := &fedv1b1.KubeFedCluster{}
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err := client.Get(context.TODO(), fedCluster, kubefedNamespace, unjoiningClusterName)
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if err != nil {
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if apierrors.IsNotFound(err) {
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return nil
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}
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return errors.Wrapf(err, "Failed to get kubefed cluster \"%s/%s\"", kubefedNamespace, unjoiningClusterName)
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}
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err = hostClientset.CoreV1().Secrets(kubefedNamespace).Delete(fedCluster.Spec.SecretRef.Name,
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&metav1.DeleteOptions{})
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if apierrors.IsNotFound(err) {
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klog.V(2).Infof("Secret \"%s/%s\" does not exist in the host cluster.", kubefedNamespace, fedCluster.Spec.SecretRef.Name)
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} else if err != nil {
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wrappedErr := errors.Wrapf(err, "Failed to delete secret \"%s/%s\" for unjoin cluster %q",
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kubefedNamespace, fedCluster.Spec.SecretRef.Name, unjoiningClusterName)
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if !forceDeletion {
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return wrappedErr
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}
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klog.V(2).Infof("%v", wrappedErr)
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} else {
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klog.V(2).Infof("Deleted secret \"%s/%s\" for unjoin cluster %q", kubefedNamespace, fedCluster.Spec.SecretRef.Name, unjoiningClusterName)
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}
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err = client.Delete(context.TODO(), fedCluster, fedCluster.Namespace, fedCluster.Name)
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if apierrors.IsNotFound(err) {
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klog.V(2).Infof("KubeFed cluster \"%s/%s\" does not exist in the host cluster.", fedCluster.Namespace, fedCluster.Name)
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} else if err != nil {
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wrappedErr := errors.Wrapf(err, "Failed to delete kubefed cluster \"%s/%s\" for unjoin cluster %q", fedCluster.Namespace, fedCluster.Name, unjoiningClusterName)
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if !forceDeletion {
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return wrappedErr
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}
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klog.V(2).Infof("%v", wrappedErr)
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} else {
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klog.V(2).Infof("Deleted kubefed cluster \"%s/%s\" for unjoin cluster %q.", fedCluster.Namespace, fedCluster.Name, unjoiningClusterName)
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}
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return nil
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}
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// deleteRBACResources deletes the cluster role, cluster rolebindings and service account
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// from the unjoining cluster.
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func deleteRBACResources(unjoiningClusterClientset kubeclient.Interface,
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namespace, unjoiningClusterName, hostClusterName string, forceDeletion, dryRun bool) error {
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saName := ClusterServiceAccountName(unjoiningClusterName, hostClusterName)
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err := deleteClusterRoleAndBinding(unjoiningClusterClientset, saName, namespace, unjoiningClusterName, forceDeletion, dryRun)
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if err != nil {
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return err
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}
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err = deleteServiceAccount(unjoiningClusterClientset, saName, namespace, unjoiningClusterName, dryRun)
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if err != nil {
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return err
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}
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return nil
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}
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// deleteFedNSFromUnjoinCluster deletes the kubefed namespace from
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// the unjoining cluster so long as the unjoining cluster is not the
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// host cluster.
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func deleteFedNSFromUnjoinCluster(hostClientset, unjoiningClusterClientset kubeclient.Interface,
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kubefedNamespace, unjoiningClusterName string, dryRun bool) error {
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if dryRun {
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return nil
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}
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hostClusterNamespace, err := hostClientset.CoreV1().Namespaces().Get(kubefedNamespace, metav1.GetOptions{})
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if err != nil {
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return errors.Wrapf(err, "Error retrieving namespace %q from host cluster", kubefedNamespace)
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}
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unjoiningClusterNamespace, err := unjoiningClusterClientset.CoreV1().Namespaces().Get(kubefedNamespace, metav1.GetOptions{})
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if err != nil {
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return errors.Wrapf(err, "Error retrieving namespace %q from unjoining cluster %q", kubefedNamespace, unjoiningClusterName)
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}
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if IsPrimaryCluster(hostClusterNamespace, unjoiningClusterNamespace) {
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klog.V(2).Infof("The kubefed namespace %q does not need to be deleted from the host cluster by unjoin.", kubefedNamespace)
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return nil
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}
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klog.V(2).Infof("Deleting kubefed namespace %q from unjoining cluster %q.", kubefedNamespace, unjoiningClusterName)
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err = unjoiningClusterClientset.CoreV1().Namespaces().Delete(kubefedNamespace, &metav1.DeleteOptions{})
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if apierrors.IsNotFound(err) {
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klog.V(2).Infof("The kubefed namespace %q no longer exists in unjoining cluster %q.", kubefedNamespace, unjoiningClusterName)
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return nil
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} else if err != nil {
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return errors.Wrapf(err, "Could not delete kubefed namespace %q from unjoining cluster %q", kubefedNamespace, unjoiningClusterName)
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} else {
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klog.V(2).Infof("Deleted kubefed namespace %q from unjoining cluster %q.", kubefedNamespace, unjoiningClusterName)
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}
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return nil
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}
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// deleteServiceAccount deletes a service account in the cluster associated
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// with clusterClientset with credentials that are used by the host cluster
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// to access its API server.
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func deleteServiceAccount(clusterClientset kubeclient.Interface, saName,
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namespace, unjoiningClusterName string, dryRun bool) error {
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if dryRun {
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return nil
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}
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klog.V(2).Infof("Deleting service account \"%s/%s\" in unjoining cluster %q.", namespace, saName, unjoiningClusterName)
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// Delete a service account.
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err := clusterClientset.CoreV1().ServiceAccounts(namespace).Delete(saName,
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&metav1.DeleteOptions{})
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if apierrors.IsNotFound(err) {
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klog.V(2).Infof("Service account \"%s/%s\" does not exist.", namespace, saName)
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} else if err != nil {
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return errors.Wrapf(err, "Could not delete service account \"%s/%s\"", namespace, saName)
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} else {
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klog.V(2).Infof("Deleted service account \"%s/%s\" in unjoining cluster %q.", namespace, saName, unjoiningClusterName)
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}
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return nil
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}
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// deleteClusterRoleAndBinding deletes an RBAC cluster role and binding that
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// allows the service account identified by saName to access all resources in
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// all namespaces in the cluster associated with clusterClientset.
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func deleteClusterRoleAndBinding(clusterClientset kubeclient.Interface,
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saName, namespace, unjoiningClusterName string, forceDeletion, dryRun bool) error {
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if dryRun {
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return nil
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}
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roleName := util.RoleName(saName)
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healthCheckRoleName := util.HealthCheckRoleName(saName, namespace)
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// Attempt to delete all role and role bindings created by join
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for _, name := range []string{roleName, healthCheckRoleName} {
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klog.V(2).Infof("Deleting cluster role binding %q for service account %q in unjoining cluster %q.",
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name, saName, unjoiningClusterName)
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err := clusterClientset.RbacV1().ClusterRoleBindings().Delete(name, &metav1.DeleteOptions{})
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if apierrors.IsNotFound(err) {
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klog.V(2).Infof("Cluster role binding %q for service account %q does not exist in unjoining cluster %q.",
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name, saName, unjoiningClusterName)
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} else if err != nil {
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wrappedErr := errors.Wrapf(err, "Could not delete cluster role binding %q for service account %q in unjoining cluster %q",
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name, saName, unjoiningClusterName)
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if !forceDeletion {
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return wrappedErr
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}
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klog.V(2).Infof("%v", wrappedErr)
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} else {
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klog.V(2).Infof("Deleted cluster role binding %q for service account %q in unjoining cluster %q.",
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name, saName, unjoiningClusterName)
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}
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klog.V(2).Infof("Deleting cluster role %q for service account %q in unjoining cluster %q.",
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name, saName, unjoiningClusterName)
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err = clusterClientset.RbacV1().ClusterRoles().Delete(name, &metav1.DeleteOptions{})
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if apierrors.IsNotFound(err) {
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klog.V(2).Infof("Cluster role %q for service account %q does not exist in unjoining cluster %q.",
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name, saName, unjoiningClusterName)
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} else if err != nil {
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wrappedErr := errors.Wrapf(err, "Could not delete cluster role %q for service account %q in unjoining cluster %q",
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name, saName, unjoiningClusterName)
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if !forceDeletion {
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return wrappedErr
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}
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klog.V(2).Infof("%v", wrappedErr)
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} else {
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klog.V(2).Infof("Deleted cluster role %q for service account %q in unjoining cluster %q.",
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name, saName, unjoiningClusterName)
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}
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}
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klog.V(2).Infof("Deleting role binding \"%s/%s\" for service account %q in unjoining cluster %q.",
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namespace, roleName, saName, unjoiningClusterName)
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err := clusterClientset.RbacV1().RoleBindings(namespace).Delete(roleName, &metav1.DeleteOptions{})
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if apierrors.IsNotFound(err) {
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klog.V(2).Infof("Role binding \"%s/%s\" for service account %q does not exist in unjoining cluster %q.",
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namespace, roleName, saName, unjoiningClusterName)
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} else if err != nil {
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wrappedErr := errors.Wrapf(err, "Could not delete role binding \"%s/%s\" for service account %q in unjoining cluster %q",
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namespace, roleName, saName, unjoiningClusterName)
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if !forceDeletion {
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return wrappedErr
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}
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klog.V(2).Infof("%v", wrappedErr)
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} else {
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klog.V(2).Infof("Deleted role binding \"%s/%s\" for service account %q in unjoining cluster %q.",
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namespace, roleName, saName, unjoiningClusterName)
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}
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klog.V(2).Infof("Deleting role \"%s/%s\" for service account %q in unjoining cluster %q.",
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namespace, roleName, saName, unjoiningClusterName)
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err = clusterClientset.RbacV1().Roles(namespace).Delete(roleName, &metav1.DeleteOptions{})
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if apierrors.IsNotFound(err) {
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klog.V(2).Infof("Role \"%s/%s\" for service account %q does not exist in unjoining cluster %q.",
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namespace, roleName, saName, unjoiningClusterName)
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} else if err != nil {
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wrappedErr := errors.Wrapf(err, "Could not delete role \"%s/%s\" for service account %q in unjoining cluster %q",
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namespace, roleName, saName, unjoiningClusterName)
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if !forceDeletion {
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return wrappedErr
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}
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klog.V(2).Infof("%v", wrappedErr)
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} else {
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klog.V(2).Infof("Deleting Role \"%s/%s\" for service account %q in unjoining cluster %q.",
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namespace, roleName, saName, unjoiningClusterName)
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}
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return nil
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}
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