Restore backup to a new etcd plane

cluster/cluster.go

@@ -17,11 +17,11 @@ import (
 	"github.com/rancher/rke/pki"
 	"github.com/rancher/rke/services"
 	"github.com/rancher/rke/util"
-	"github.com/rancher/types/apis/management.cattle.io/v3"
+	v3 "github.com/rancher/types/apis/management.cattle.io/v3"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/sync/errgroup"
 	"gopkg.in/yaml.v2"
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/tools/clientcmd"
 	"k8s.io/client-go/util/cert"
@@ -338,7 +338,7 @@ func (c *Cluster) deployAddons(ctx context.Context) error {
 func (c *Cluster) SyncLabelsAndTaints(ctx context.Context, currentCluster *Cluster) error {
 	// Handle issue when deleting all controlplane nodes https://github.com/rancher/rancher/issues/15810
 	if currentCluster != nil {
-		cpToDelete := hosts.GetToDeleteHosts(currentCluster.ControlPlaneHosts, c.ControlPlaneHosts, c.InactiveHosts)
+		cpToDelete := hosts.GetToDeleteHosts(currentCluster.ControlPlaneHosts, c.ControlPlaneHosts, c.InactiveHosts, false)
 		if len(cpToDelete) == len(currentCluster.ControlPlaneHosts) {
 			log.Infof(ctx, "[sync] Cleaning left control plane nodes from reconcilation")
 			for _, toDeleteHost := range cpToDelete {

cluster/hosts.go

@@ -185,10 +185,11 @@ func removeFromHosts(hostToRemove *hosts.Host, hostList []*hosts.Host) []*hosts.
 }
 
 func removeFromRKENodes(nodeToRemove v3.RKEConfigNode, nodeList []v3.RKEConfigNode) []v3.RKEConfigNode {
-	for i := range nodeList {
-		if nodeToRemove.Address == nodeList[i].Address {
-			return append(nodeList[:i], nodeList[i+1:]...)
+	l := []v3.RKEConfigNode{}
+	for _, node := range nodeList {
+		if nodeToRemove.Address != node.Address {
+			l = append(l, node)
 		}
 	}
-	return nodeList
+	return l
 }

cluster/reconcile.go

@@ -11,7 +11,7 @@ import (
 	"github.com/rancher/rke/log"
 	"github.com/rancher/rke/pki"
 	"github.com/rancher/rke/services"
-	"github.com/rancher/types/apis/management.cattle.io/v3"
+	v3 "github.com/rancher/types/apis/management.cattle.io/v3"
 	"github.com/sirupsen/logrus"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/util/cert"
@@ -20,6 +20,8 @@ import (
 const (
 	unschedulableEtcdTaint    = "node-role.kubernetes.io/etcd=true:NoExecute"
 	unschedulableControlTaint = "node-role.kubernetes.io/controlplane=true:NoSchedule"
+
+	EtcdPlaneNodesReplacedErr = "Etcd plane nodes are replaced. Stopping provisioning. Please restore your cluster from backup."
 )
 
 func ReconcileCluster(ctx context.Context, kubeCluster, currentCluster *Cluster, flags ExternalFlags) error {
@@ -62,7 +64,7 @@ func ReconcileCluster(ctx context.Context, kubeCluster, currentCluster *Cluster,
 func reconcileWorker(ctx context.Context, currentCluster, kubeCluster *Cluster, kubeClient *kubernetes.Clientset) error {
 	// worker deleted first to avoid issues when worker+controller on same host
 	logrus.Debugf("[reconcile] Check worker hosts to be deleted")
-	wpToDelete := hosts.GetToDeleteHosts(currentCluster.WorkerHosts, kubeCluster.WorkerHosts, kubeCluster.InactiveHosts)
+	wpToDelete := hosts.GetToDeleteHosts(currentCluster.WorkerHosts, kubeCluster.WorkerHosts, kubeCluster.InactiveHosts, false)
 	for _, toDeleteHost := range wpToDelete {
 		toDeleteHost.IsWorker = false
 		if err := hosts.DeleteNode(ctx, toDeleteHost, kubeClient, toDeleteHost.IsControl, kubeCluster.CloudProvider.Name); err != nil {
@@ -94,7 +96,7 @@ func reconcileControl(ctx context.Context, currentCluster, kubeCluster *Cluster,
 	if err != nil {
 		return err
 	}
-	cpToDelete := hosts.GetToDeleteHosts(currentCluster.ControlPlaneHosts, kubeCluster.ControlPlaneHosts, kubeCluster.InactiveHosts)
+	cpToDelete := hosts.GetToDeleteHosts(currentCluster.ControlPlaneHosts, kubeCluster.ControlPlaneHosts, kubeCluster.InactiveHosts, false)
 	// move the current host in local kubeconfig to the end of the list
 	for i, toDeleteHost := range cpToDelete {
 		if toDeleteHost.Address == selfDeleteAddress {
@@ -165,11 +167,15 @@ func reconcileHost(ctx context.Context, toDeleteHost *hosts.Host, worker, etcd b
 
 func reconcileEtcd(ctx context.Context, currentCluster, kubeCluster *Cluster, kubeClient *kubernetes.Clientset) error {
 	log.Infof(ctx, "[reconcile] Check etcd hosts to be deleted")
+	if isEtcdPlaneReplaced(ctx, currentCluster, kubeCluster) {
+		logrus.Warnf("%v", EtcdPlaneNodesReplacedErr)
+		return fmt.Errorf("%v", EtcdPlaneNodesReplacedErr)
+	}
 	// get tls for the first current etcd host
 	clientCert := cert.EncodeCertPEM(currentCluster.Certificates[pki.KubeNodeCertName].Certificate)
 	clientkey := cert.EncodePrivateKeyPEM(currentCluster.Certificates[pki.KubeNodeCertName].Key)
 
-	etcdToDelete := hosts.GetToDeleteHosts(currentCluster.EtcdHosts, kubeCluster.EtcdHosts, kubeCluster.InactiveHosts)
+	etcdToDelete := hosts.GetToDeleteHosts(currentCluster.EtcdHosts, kubeCluster.EtcdHosts, kubeCluster.InactiveHosts, false)
 	for _, etcdHost := range etcdToDelete {
 		if err := services.RemoveEtcdMember(ctx, etcdHost, kubeCluster.EtcdHosts, currentCluster.LocalConnDialerFactory, clientCert, clientkey); err != nil {
 			log.Warnf(ctx, "[reconcile] %v", err)
@@ -335,3 +341,16 @@ func checkCertificateChanges(ctx context.Context, currentCluster, kubeCluster *C
 		}
 	}
 }
+
+func isEtcdPlaneReplaced(ctx context.Context, currentCluster, kubeCluster *Cluster) bool {
+	etcdToDeleteInactive := hosts.GetToDeleteHosts(currentCluster.EtcdHosts, kubeCluster.EtcdHosts, kubeCluster.InactiveHosts, true)
+	// old etcd nodes are down, we added new ones
+	if len(etcdToDeleteInactive) == len(currentCluster.EtcdHosts) {
+		return true
+	}
+	// one or more etcd nodes are removed from cluster.yaml and replaced
+	if len(hosts.GetHostListIntersect(kubeCluster.EtcdHosts, currentCluster.EtcdHosts)) == 0 {
+		return true
+	}
+	return false
+}

cluster/remove.go

@@ -9,7 +9,7 @@ import (
 	"github.com/rancher/rke/pki"
 	"github.com/rancher/rke/services"
 	"github.com/rancher/rke/util"
-	"github.com/rancher/types/apis/management.cattle.io/v3"
+	v3 "github.com/rancher/types/apis/management.cattle.io/v3"
 	"golang.org/x/sync/errgroup"
 )
 
@@ -85,7 +85,8 @@ func (c *Cluster) RemoveOldNodes(ctx context.Context) error {
 	}
 	uniqueHosts := hosts.GetUniqueHostList(c.EtcdHosts, c.ControlPlaneHosts, c.WorkerHosts)
 	for _, node := range nodeList.Items {
-		if k8s.IsNodeReady(node) {
+		_, isEtcd := node.Labels[etcdRoleLabel]
+		if k8s.IsNodeReady(node) && !isEtcd {
 			continue
 		}
 		host := &hosts.Host{}

cmd/etcd.go

@@ -158,7 +158,7 @@ func RestoreEtcdSnapshot(
 	}
 
 	if err := cluster.RestartClusterPods(ctx, kubeCluster); err != nil {
-		return nil
+		return err
 	}
 	if err := kubeCluster.RemoveOldNodes(ctx); err != nil {
 		return err

cmd/up.go

@@ -11,7 +11,7 @@ import (
 	"github.com/rancher/rke/hosts"
 	"github.com/rancher/rke/log"
 	"github.com/rancher/rke/pki"
-	"github.com/rancher/types/apis/management.cattle.io/v3"
+	v3 "github.com/rancher/types/apis/management.cattle.io/v3"
 	"github.com/urfave/cli"
 	"k8s.io/client-go/util/cert"
 )
@@ -97,7 +97,6 @@ func ClusterUp(ctx context.Context, dialersOptions hosts.DialersOptions, flags c
 	if err != nil {
 		return APIURL, caCrt, clientCert, clientKey, nil, err
 	}
-
 	err = kubeCluster.TunnelHosts(ctx, flags)
 	if err != nil {
 		return APIURL, caCrt, clientCert, clientKey, nil, err

hosts/hosts.go

@@ -14,7 +14,7 @@ import (
 	"github.com/rancher/rke/docker"
 	"github.com/rancher/rke/k8s"
 	"github.com/rancher/rke/log"
-	"github.com/rancher/types/apis/management.cattle.io/v3"
+	v3 "github.com/rancher/types/apis/management.cattle.io/v3"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/client-go/kubernetes"
 )
@@ -179,7 +179,7 @@ func RemoveTaintFromHost(ctx context.Context, host *Host, taintKey string, kubeC
 	return nil
 }
 
-func GetToDeleteHosts(currentHosts, configHosts, inactiveHosts []*Host) []*Host {
+func GetToDeleteHosts(currentHosts, configHosts, inactiveHosts []*Host, includeInactive bool) []*Host {
 	toDeleteHosts := []*Host{}
 	for _, currentHost := range currentHosts {
 		found := false
@@ -196,7 +196,7 @@ func GetToDeleteHosts(currentHosts, configHosts, inactiveHosts []*Host) []*Host
 					break
 				}
 			}
-			if !inactive {
+			if (inactive && includeInactive) || !inactive {
 				toDeleteHosts = append(toDeleteHosts, currentHost)
 			}
 		}
@@ -354,3 +354,17 @@ func IsNodeInList(host *Host, hostList []*Host) bool {
 	}
 	return false
 }
+
+func GetHostListIntersect(a []*Host, b []*Host) []*Host {
+	s := []*Host{}
+	hash := map[string]*Host{}
+	for _, h := range a {
+		hash[h.Address] = h
+	}
+	for _, h := range b {
+		if _, ok := hash[h.Address]; ok {
+			s = append(s, h)
+		}
+	}
+	return s
+}

pki/deploy.go

@@ -13,7 +13,7 @@ import (
 	"github.com/rancher/rke/docker"
 	"github.com/rancher/rke/hosts"
 	"github.com/rancher/rke/log"
-	"github.com/rancher/types/apis/management.cattle.io/v3"
+	v3 "github.com/rancher/types/apis/management.cattle.io/v3"
 	"github.com/sirupsen/logrus"
 )