forked from rancher/rke
/
reconcile.go
247 lines (229 loc) · 9.96 KB
/
reconcile.go
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package cluster
import (
"context"
"fmt"
"github.com/rancher/rke/hosts"
"github.com/rancher/rke/k8s"
"github.com/rancher/rke/log"
"github.com/rancher/rke/pki"
"github.com/rancher/rke/services"
"github.com/rancher/types/apis/management.cattle.io/v3"
"github.com/sirupsen/logrus"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/util/cert"
)
const (
unschedulableEtcdTaint = "node-role.kubernetes.io/etcd=true:NoExecute"
)
func ReconcileCluster(ctx context.Context, kubeCluster, currentCluster *Cluster, updateOnly bool) error {
log.Infof(ctx, "[reconcile] Reconciling cluster state")
kubeCluster.UpdateWorkersOnly = updateOnly
if currentCluster == nil {
log.Infof(ctx, "[reconcile] This is newly generated cluster")
kubeCluster.UpdateWorkersOnly = false
return nil
}
kubeClient, err := k8s.NewClient(kubeCluster.LocalKubeConfigPath, kubeCluster.K8sWrapTransport)
if err != nil {
return fmt.Errorf("Failed to initialize new kubernetes client: %v", err)
}
// sync node labels to define the toDelete labels
syncLabels(ctx, currentCluster, kubeCluster)
if err := reconcileEtcd(ctx, currentCluster, kubeCluster, kubeClient); err != nil {
return fmt.Errorf("Failed to reconcile etcd plane: %v", err)
}
if err := reconcileWorker(ctx, currentCluster, kubeCluster, kubeClient); err != nil {
return err
}
if err := reconcileControl(ctx, currentCluster, kubeCluster, kubeClient); err != nil {
return err
}
log.Infof(ctx, "[reconcile] Reconciled cluster state successfully")
return nil
}
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)
for _, toDeleteHost := range wpToDelete {
toDeleteHost.IsWorker = false
if err := hosts.DeleteNode(ctx, toDeleteHost, kubeClient, toDeleteHost.IsControl, kubeCluster.CloudProvider.Name); err != nil {
return fmt.Errorf("Failed to delete worker node %s from cluster", toDeleteHost.Address)
}
// attempting to clean services/files on the host
if err := reconcileHost(ctx, toDeleteHost, true, false, currentCluster.SystemImages.Alpine, currentCluster.DockerDialerFactory, currentCluster.PrivateRegistriesMap); err != nil {
log.Warnf(ctx, "[reconcile] Couldn't clean up worker node [%s]: %v", toDeleteHost.Address, err)
continue
}
}
// attempt to remove unschedulable taint
toAddHosts := hosts.GetToAddHosts(currentCluster.WorkerHosts, kubeCluster.WorkerHosts)
for _, host := range toAddHosts {
host.UpdateWorker = true
if host.IsEtcd {
host.ToDelTaints = append(host.ToDelTaints, unschedulableEtcdTaint)
}
}
return nil
}
func reconcileControl(ctx context.Context, currentCluster, kubeCluster *Cluster, kubeClient *kubernetes.Clientset) error {
logrus.Debugf("[reconcile] Check Control plane hosts to be deleted")
selfDeleteAddress, err := getLocalConfigAddress(kubeCluster.LocalKubeConfigPath)
if err != nil {
return err
}
cpToDelete := hosts.GetToDeleteHosts(currentCluster.ControlPlaneHosts, kubeCluster.ControlPlaneHosts, kubeCluster.InactiveHosts)
// move the current host in local kubeconfig to the end of the list
for i, toDeleteHost := range cpToDelete {
if toDeleteHost.Address == selfDeleteAddress {
cpToDelete = append(cpToDelete[:i], cpToDelete[i+1:]...)
cpToDelete = append(cpToDelete, toDeleteHost)
}
}
for _, toDeleteHost := range cpToDelete {
kubeClient, err := k8s.NewClient(kubeCluster.LocalKubeConfigPath, kubeCluster.K8sWrapTransport)
if err != nil {
return fmt.Errorf("Failed to initialize new kubernetes client: %v", err)
}
if err := hosts.DeleteNode(ctx, toDeleteHost, kubeClient, toDeleteHost.IsWorker, kubeCluster.CloudProvider.Name); err != nil {
return fmt.Errorf("Failed to delete controlplane node %s from cluster", toDeleteHost.Address)
}
// attempting to clean services/files on the host
if err := reconcileHost(ctx, toDeleteHost, false, false, currentCluster.SystemImages.Alpine, currentCluster.DockerDialerFactory, currentCluster.PrivateRegistriesMap); err != nil {
log.Warnf(ctx, "[reconcile] Couldn't clean up controlplane node [%s]: %v", toDeleteHost.Address, err)
continue
}
}
// rebuilding local admin config to enable saving cluster state
if err := rebuildLocalAdminConfig(ctx, kubeCluster); err != nil {
return err
}
// attempt to remove unschedulable taint
toAddHosts := hosts.GetToAddHosts(currentCluster.ControlPlaneHosts, kubeCluster.ControlPlaneHosts)
for _, host := range toAddHosts {
kubeCluster.UpdateWorkersOnly = false
if host.IsEtcd {
host.ToDelTaints = append(host.ToDelTaints, unschedulableEtcdTaint)
}
}
return nil
}
func reconcileHost(ctx context.Context, toDeleteHost *hosts.Host, worker, etcd bool, cleanerImage string, dialerFactory hosts.DialerFactory, prsMap map[string]v3.PrivateRegistry) error {
if err := toDeleteHost.TunnelUp(ctx, dialerFactory); err != nil {
return fmt.Errorf("Not able to reach the host: %v", err)
}
if worker {
if err := services.RemoveWorkerPlane(ctx, []*hosts.Host{toDeleteHost}, false); err != nil {
return fmt.Errorf("Couldn't remove worker plane: %v", err)
}
if err := toDeleteHost.CleanUpWorkerHost(ctx, cleanerImage, prsMap); err != nil {
return fmt.Errorf("Not able to clean the host: %v", err)
}
} else if etcd {
if err := services.RemoveEtcdPlane(ctx, []*hosts.Host{toDeleteHost}, false); err != nil {
return fmt.Errorf("Couldn't remove etcd plane: %v", err)
}
if err := toDeleteHost.CleanUpEtcdHost(ctx, cleanerImage, prsMap); err != nil {
return fmt.Errorf("Not able to clean the host: %v", err)
}
} else {
if err := services.RemoveControlPlane(ctx, []*hosts.Host{toDeleteHost}, false); err != nil {
return fmt.Errorf("Couldn't remove control plane: %v", err)
}
if err := toDeleteHost.CleanUpControlHost(ctx, cleanerImage, prsMap); err != nil {
return fmt.Errorf("Not able to clean the host: %v", err)
}
}
return nil
}
func reconcileEtcd(ctx context.Context, currentCluster, kubeCluster *Cluster, kubeClient *kubernetes.Clientset) error {
log.Infof(ctx, "[reconcile] Check etcd hosts to be deleted")
// 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)
for _, etcdHost := range etcdToDelete {
if err := services.RemoveEtcdMember(ctx, etcdHost, kubeCluster.EtcdHosts, currentCluster.LocalConnDialerFactory, clientCert, clientkey); err != nil {
log.Warnf(ctx, "[reconcile] %v", err)
continue
}
if err := hosts.DeleteNode(ctx, etcdHost, kubeClient, etcdHost.IsControl, kubeCluster.CloudProvider.Name); err != nil {
log.Warnf(ctx, "Failed to delete etcd node %s from cluster", etcdHost.Address)
continue
}
// attempting to clean services/files on the host
if err := reconcileHost(ctx, etcdHost, false, true, currentCluster.SystemImages.Alpine, currentCluster.DockerDialerFactory, currentCluster.PrivateRegistriesMap); err != nil {
log.Warnf(ctx, "[reconcile] Couldn't clean up etcd node [%s]: %v", etcdHost.Address, err)
continue
}
}
log.Infof(ctx, "[reconcile] Check etcd hosts to be added")
etcdToAdd := hosts.GetToAddHosts(currentCluster.EtcdHosts, kubeCluster.EtcdHosts)
crtMap := currentCluster.Certificates
var err error
for _, etcdHost := range etcdToAdd {
kubeCluster.UpdateWorkersOnly = false
etcdHost.ToAddEtcdMember = true
// Generate new certificate for the new etcd member
crtMap, err = pki.RegenerateEtcdCertificate(
ctx,
crtMap,
etcdHost,
kubeCluster.EtcdHosts,
kubeCluster.ClusterDomain,
kubeCluster.KubernetesServiceIP)
if err != nil {
return err
}
}
currentCluster.Certificates = crtMap
for _, etcdHost := range etcdToAdd {
// deploy certificates on new etcd host
if err := pki.DeployCertificatesOnHost(ctx, etcdHost, currentCluster.Certificates, kubeCluster.SystemImages.CertDownloader, pki.CertPathPrefix, kubeCluster.PrivateRegistriesMap); err != nil {
return err
}
// Check if the host already part of the cluster -- this will cover cluster with lost quorum
isEtcdMember, err := services.IsEtcdMember(ctx, etcdHost, kubeCluster.EtcdHosts, currentCluster.LocalConnDialerFactory, clientCert, clientkey)
if err != nil {
return err
}
if !isEtcdMember {
if err := services.AddEtcdMember(ctx, etcdHost, kubeCluster.EtcdHosts, currentCluster.LocalConnDialerFactory, clientCert, clientkey); err != nil {
return err
}
}
etcdHost.ToAddEtcdMember = false
readyHosts := getReadyEtcdHosts(kubeCluster.EtcdHosts)
etcdProcessHostMap := kubeCluster.getEtcdProcessHostMap(readyHosts)
if err := services.ReloadEtcdCluster(ctx, readyHosts, currentCluster.LocalConnDialerFactory, clientCert, clientkey, currentCluster.PrivateRegistriesMap, etcdProcessHostMap, kubeCluster.SystemImages.Alpine); err != nil {
return err
}
}
return nil
}
func syncLabels(ctx context.Context, currentCluster, kubeCluster *Cluster) {
currentHosts := hosts.GetUniqueHostList(currentCluster.EtcdHosts, currentCluster.ControlPlaneHosts, currentCluster.WorkerHosts)
configHosts := hosts.GetUniqueHostList(kubeCluster.EtcdHosts, kubeCluster.ControlPlaneHosts, kubeCluster.WorkerHosts)
for _, host := range configHosts {
for _, currentHost := range currentHosts {
if host.Address == currentHost.Address {
for k, v := range currentHost.Labels {
if _, ok := host.Labels[k]; !ok {
host.ToDelLabels[k] = v
}
}
break
}
}
}
}
func getReadyEtcdHosts(etcdHosts []*hosts.Host) []*hosts.Host {
readyEtcdHosts := []*hosts.Host{}
for _, host := range etcdHosts {
if !host.ToAddEtcdMember {
readyEtcdHosts = append(readyEtcdHosts, host)
host.ExistingEtcdCluster = true
}
}
return readyEtcdHosts
}