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controlplane.go
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controlplane.go
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package services
import (
"context"
"fmt"
"path"
"strings"
"sync"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/client"
"github.com/rancher/rke/docker"
"github.com/rancher/rke/hosts"
"github.com/rancher/rke/k8s"
"github.com/rancher/rke/log"
"github.com/rancher/rke/pki"
v3 "github.com/rancher/rke/types"
"github.com/rancher/rke/util"
"github.com/sirupsen/logrus"
"golang.org/x/sync/errgroup"
"k8s.io/client-go/kubernetes"
"k8s.io/kubectl/pkg/drain"
)
func RunControlPlane(ctx context.Context, controlHosts []*hosts.Host, localConnDialerFactory hosts.DialerFactory, prsMap map[string]v3.PrivateRegistry, cpNodePlanMap map[string]v3.RKEConfigNodePlan, updateWorkersOnly bool, alpineImage string, certMap map[string]pki.CertificatePKI, k8sVersion string) error {
if updateWorkersOnly {
return nil
}
log.Infof(ctx, "[%s] Building up Controller Plane..", ControlRole)
var errgrp errgroup.Group
hostsQueue := util.GetObjectQueue(controlHosts)
for w := 0; w < WorkerThreads; w++ {
errgrp.Go(func() error {
var errList []error
for host := range hostsQueue {
runHost := host.(*hosts.Host)
err := doDeployControlHost(ctx, runHost, localConnDialerFactory, prsMap, cpNodePlanMap[runHost.Address].Processes, alpineImage, certMap, k8sVersion)
if err != nil {
errList = append(errList, err)
}
}
return util.ErrList(errList)
})
}
if err := errgrp.Wait(); err != nil {
return err
}
log.Infof(ctx, "[%s] Successfully started Controller Plane..", ControlRole)
return nil
}
func UpgradeControlPlaneNodes(ctx context.Context, kubeClient *kubernetes.Clientset, controlHosts []*hosts.Host, localConnDialerFactory hosts.DialerFactory,
prsMap map[string]v3.PrivateRegistry, cpNodePlanMap map[string]v3.RKEConfigNodePlan, updateWorkersOnly bool, alpineImage string, certMap map[string]pki.CertificatePKI,
upgradeStrategy *v3.NodeUpgradeStrategy, newHosts, inactiveHosts map[string]bool, maxUnavailable int, k8sVersion, cloudProviderName string) (string, error) {
if updateWorkersOnly {
return "", nil
}
var errMsgMaxUnavailableNotFailed string
var drainHelper drain.Helper
log.Infof(ctx, "[%s] Processing controlplane hosts for upgrade %v at a time", ControlRole, maxUnavailable)
if len(newHosts) > 0 {
var nodes []string
for _, host := range controlHosts {
if newHosts[host.HostnameOverride] {
nodes = append(nodes, host.HostnameOverride)
}
}
if len(nodes) > 0 {
log.Infof(ctx, "[%s] Adding controlplane nodes %v to the cluster", ControlRole, strings.Join(nodes, ","))
}
}
if upgradeStrategy.Drain != nil && *upgradeStrategy.Drain {
drainHelper = getDrainHelper(kubeClient, *upgradeStrategy)
log.Infof(ctx, "[%s] Parameters provided to drain command: %#v", ControlRole, fmt.Sprintf("Force: %v, IgnoreAllDaemonSets: %v, DeleteEmptyDirData: %v, Timeout: %v, GracePeriodSeconds: %v", drainHelper.Force, drainHelper.IgnoreAllDaemonSets, drainHelper.DeleteEmptyDirData, drainHelper.Timeout, drainHelper.GracePeriodSeconds))
}
var inactiveHostErr error
if len(inactiveHosts) > 0 {
var inactiveHostNames []string
for hostName := range inactiveHosts {
inactiveHostNames = append(inactiveHostNames, hostName)
}
inactiveHostErr = fmt.Errorf("provisioning incomplete, host(s) [%s] skipped because they could not be contacted", strings.Join(inactiveHostNames, ","))
}
hostsFailedToUpgrade, err := processControlPlaneForUpgrade(ctx, kubeClient, controlHosts, localConnDialerFactory, prsMap, cpNodePlanMap, updateWorkersOnly, alpineImage, certMap,
upgradeStrategy, newHosts, inactiveHosts, maxUnavailable, drainHelper, k8sVersion, cloudProviderName)
if err != nil || inactiveHostErr != nil {
if len(hostsFailedToUpgrade) > 0 {
logrus.Errorf("Failed to upgrade hosts: %v with error %v", strings.Join(hostsFailedToUpgrade, ","), err)
errMsgMaxUnavailableNotFailed = fmt.Sprintf("Failed to upgrade hosts: %v with error %v", strings.Join(hostsFailedToUpgrade, ","), err)
}
var errors []error
for _, e := range []error{err, inactiveHostErr} {
if e != nil {
errors = append(errors, e)
}
}
return errMsgMaxUnavailableNotFailed, util.ErrList(errors)
}
log.Infof(ctx, "[%s] Successfully upgraded Controller Plane..", ControlRole)
return errMsgMaxUnavailableNotFailed, nil
}
func processControlPlaneForUpgrade(ctx context.Context, kubeClient *kubernetes.Clientset, controlHosts []*hosts.Host, localConnDialerFactory hosts.DialerFactory,
prsMap map[string]v3.PrivateRegistry, cpNodePlanMap map[string]v3.RKEConfigNodePlan, updateWorkersOnly bool, alpineImage string, certMap map[string]pki.CertificatePKI,
upgradeStrategy *v3.NodeUpgradeStrategy, newHosts, inactiveHosts map[string]bool, maxUnavailable int, drainHelper drain.Helper, k8sVersion, cloudProviderName string) ([]string, error) {
var errgrp errgroup.Group
var failedHosts []string
var hostsFailedToUpgrade = make(chan string, maxUnavailable)
var hostsFailed sync.Map
currentHostsPool := make(map[string]bool)
for _, host := range controlHosts {
currentHostsPool[host.HostnameOverride] = true
}
// upgrade control plane hosts maxUnavailable nodes time for zero downtime upgrades
hostsQueue := util.GetObjectQueue(controlHosts)
for w := 0; w < maxUnavailable; w++ {
errgrp.Go(func() error {
var errList []error
for host := range hostsQueue {
runHost := host.(*hosts.Host)
log.Infof(ctx, "Processing controlplane host %v", runHost.HostnameOverride)
if newHosts[runHost.HostnameOverride] {
if err := startNewControlHost(ctx, runHost, localConnDialerFactory, prsMap, cpNodePlanMap, updateWorkersOnly, alpineImage, certMap, k8sVersion); err != nil {
errList = append(errList, err)
hostsFailedToUpgrade <- runHost.HostnameOverride
hostsFailed.Store(runHost.HostnameOverride, true)
break
}
continue
}
if err := CheckNodeReady(kubeClient, runHost, ControlRole, cloudProviderName); err != nil {
errList = append(errList, err)
hostsFailedToUpgrade <- runHost.HostnameOverride
hostsFailed.Store(runHost.HostnameOverride, true)
break
}
nodes, err := getNodeListForUpgrade(kubeClient, &sync.Map{}, newHosts, inactiveHosts, ControlRole)
if err != nil {
errList = append(errList, err)
}
var maxUnavailableHit bool
for _, node := range nodes {
// in case any previously added nodes or till now unprocessed nodes become unreachable during upgrade
if !k8s.IsNodeReady(node) && currentHostsPool[node.Labels[k8s.HostnameLabel]] {
if len(hostsFailedToUpgrade) >= maxUnavailable {
maxUnavailableHit = true
break
}
hostsFailed.Store(node.Labels[k8s.HostnameLabel], true)
hostsFailedToUpgrade <- node.Labels[k8s.HostnameLabel]
errList = append(errList, fmt.Errorf("host %v not ready", node.Labels[k8s.HostnameLabel]))
}
}
if maxUnavailableHit || len(hostsFailedToUpgrade) >= maxUnavailable {
break
}
controlPlaneUpgradable, workerPlaneUpgradable, err := checkHostUpgradable(ctx, runHost, cpNodePlanMap, k8sVersion)
if err != nil {
errList = append(errList, err)
hostsFailedToUpgrade <- runHost.HostnameOverride
hostsFailed.Store(runHost.HostnameOverride, true)
break
}
if !controlPlaneUpgradable && !workerPlaneUpgradable {
log.Infof(ctx, "Upgrade not required for controlplane and worker components of host %v", runHost.HostnameOverride)
if err := k8s.CordonUncordon(kubeClient, runHost.HostnameOverride, runHost.InternalAddress, cloudProviderName, false); err != nil {
// This node didn't undergo an upgrade, so RKE will only log any error after uncordoning it and won't count this in maxUnavailable
logrus.Errorf("[controlplane] Failed to uncordon node %v, error: %v", runHost.HostnameOverride, err)
}
continue
}
shouldDrain := upgradeStrategy.Drain != nil && *upgradeStrategy.Drain
if err := upgradeControlHost(ctx, kubeClient, runHost, shouldDrain, drainHelper, localConnDialerFactory, prsMap, cpNodePlanMap, updateWorkersOnly,
alpineImage, certMap, controlPlaneUpgradable, workerPlaneUpgradable, k8sVersion, cloudProviderName); err != nil {
errList = append(errList, err)
hostsFailedToUpgrade <- runHost.HostnameOverride
hostsFailed.Store(runHost.HostnameOverride, true)
break
}
}
return util.ErrList(errList)
})
}
err := errgrp.Wait()
close(hostsFailedToUpgrade)
if err != nil {
for host := range hostsFailedToUpgrade {
failedHosts = append(failedHosts, host)
}
}
return failedHosts, err
}
func startNewControlHost(ctx context.Context, runHost *hosts.Host, localConnDialerFactory hosts.DialerFactory, prsMap map[string]v3.PrivateRegistry,
cpNodePlanMap map[string]v3.RKEConfigNodePlan, updateWorkersOnly bool, alpineImage string, certMap map[string]pki.CertificatePKI, k8sVersion string) error {
if err := doDeployControlHost(ctx, runHost, localConnDialerFactory, prsMap, cpNodePlanMap[runHost.Address].Processes, alpineImage, certMap, k8sVersion); err != nil {
return err
}
return doDeployWorkerPlaneHost(ctx, runHost, localConnDialerFactory, prsMap, cpNodePlanMap[runHost.Address].Processes, certMap, updateWorkersOnly, alpineImage, k8sVersion)
}
func checkHostUpgradable(ctx context.Context, runHost *hosts.Host, cpNodePlanMap map[string]v3.RKEConfigNodePlan, k8sVersion string) (bool, bool, error) {
var controlPlaneUpgradable, workerPlaneUpgradable bool
controlPlaneUpgradable, err := isControlPlaneHostUpgradable(ctx, runHost, cpNodePlanMap[runHost.Address].Processes, k8sVersion)
if err != nil {
return controlPlaneUpgradable, workerPlaneUpgradable, err
}
workerPlaneUpgradable, err = isWorkerHostUpgradable(ctx, runHost, cpNodePlanMap[runHost.Address].Processes, k8sVersion)
if err != nil {
return controlPlaneUpgradable, workerPlaneUpgradable, err
}
return controlPlaneUpgradable, workerPlaneUpgradable, nil
}
func upgradeControlHost(ctx context.Context, kubeClient *kubernetes.Clientset, host *hosts.Host, drain bool, drainHelper drain.Helper,
localConnDialerFactory hosts.DialerFactory, prsMap map[string]v3.PrivateRegistry, cpNodePlanMap map[string]v3.RKEConfigNodePlan, updateWorkersOnly bool,
alpineImage string, certMap map[string]pki.CertificatePKI, controlPlaneUpgradable, workerPlaneUpgradable bool, k8sVersion, cloudProviderName string) error {
if err := cordonAndDrainNode(kubeClient, host, drain, drainHelper, ControlRole, cloudProviderName); err != nil {
return err
}
if controlPlaneUpgradable {
log.Infof(ctx, "Upgrading controlplane components for control host %v", host.HostnameOverride)
if err := doDeployControlHost(ctx, host, localConnDialerFactory, prsMap, cpNodePlanMap[host.Address].Processes, alpineImage, certMap, k8sVersion); err != nil {
return err
}
}
if workerPlaneUpgradable {
log.Infof(ctx, "Upgrading workerplane components for control host %v", host.HostnameOverride)
if err := doDeployWorkerPlaneHost(ctx, host, localConnDialerFactory, prsMap, cpNodePlanMap[host.Address].Processes, certMap, updateWorkersOnly, alpineImage, k8sVersion); err != nil {
return err
}
}
if err := CheckNodeReady(kubeClient, host, ControlRole, cloudProviderName); err != nil {
return err
}
return k8s.CordonUncordon(kubeClient, host.HostnameOverride, host.InternalAddress, cloudProviderName, false)
}
func RemoveControlPlane(ctx context.Context, controlHosts []*hosts.Host, force bool) error {
log.Infof(ctx, "[%s] Tearing down the Controller Plane..", ControlRole)
var errgrp errgroup.Group
hostsQueue := util.GetObjectQueue(controlHosts)
for w := 0; w < WorkerThreads; w++ {
errgrp.Go(func() error {
var errList []error
for host := range hostsQueue {
runHost := host.(*hosts.Host)
if err := removeKubeAPI(ctx, runHost); err != nil {
errList = append(errList, err)
}
if err := removeKubeController(ctx, runHost); err != nil {
errList = append(errList, err)
}
if err := removeScheduler(ctx, runHost); err != nil {
errList = append(errList, err)
}
// force is true in remove, false in reconcile
if !runHost.IsWorker || !runHost.IsEtcd || force {
if err := removeKubelet(ctx, runHost); err != nil {
errList = append(errList, err)
}
if err := removeKubeproxy(ctx, runHost); err != nil {
errList = append(errList, err)
}
if err := removeSidekick(ctx, runHost); err != nil {
errList = append(errList, err)
}
}
}
return util.ErrList(errList)
})
}
if err := errgrp.Wait(); err != nil {
return err
}
log.Infof(ctx, "[%s] Successfully tore down Controller Plane..", ControlRole)
return nil
}
func RestartControlPlane(ctx context.Context, controlHosts []*hosts.Host) error {
log.Infof(ctx, "[%s] Restarting the Controller Plane..", ControlRole)
var errgrp errgroup.Group
hostsQueue := util.GetObjectQueue(controlHosts)
for w := 0; w < WorkerThreads; w++ {
errgrp.Go(func() error {
var errList []error
for host := range hostsQueue {
runHost := host.(*hosts.Host)
// restart KubeAPI
if err := RestartKubeAPI(ctx, runHost); err != nil {
errList = append(errList, err)
}
// restart KubeController
if err := RestartKubeController(ctx, runHost); err != nil {
errList = append(errList, err)
}
// restart scheduler
err := RestartScheduler(ctx, runHost)
if err != nil {
errList = append(errList, err)
}
}
return util.ErrList(errList)
})
}
if err := errgrp.Wait(); err != nil {
return err
}
log.Infof(ctx, "[%s] Successfully restarted Controller Plane..", ControlRole)
return nil
}
func doDeployControlHost(ctx context.Context, host *hosts.Host, localConnDialerFactory hosts.DialerFactory, prsMap map[string]v3.PrivateRegistry, processMap map[string]v3.Process, alpineImage string, certMap map[string]pki.CertificatePKI, k8sVersion string) error {
if host.IsWorker {
if err := removeNginxProxy(ctx, host); err != nil {
return err
}
}
// run sidekick
if err := runSidekick(ctx, host, prsMap, processMap[SidekickContainerName], k8sVersion); err != nil {
return err
}
// run kubeapi
if err := runKubeAPI(ctx, host, localConnDialerFactory, prsMap, processMap[KubeAPIContainerName], alpineImage, certMap, k8sVersion); err != nil {
return err
}
// run kubecontroller
if err := runKubeController(ctx, host, localConnDialerFactory, prsMap, processMap[KubeControllerContainerName], alpineImage, k8sVersion); err != nil {
return err
}
// run scheduler
return runScheduler(ctx, host, localConnDialerFactory, prsMap, processMap[SchedulerContainerName], alpineImage, k8sVersion)
}
func isControlPlaneHostUpgradable(ctx context.Context, host *hosts.Host, processMap map[string]v3.Process, k8sVersion string) (bool, error) {
for _, service := range []string{SidekickContainerName, KubeAPIContainerName, KubeControllerContainerName, SchedulerContainerName} {
process := processMap[service]
imageCfg, hostCfg, _ := GetProcessConfig(process, host, k8sVersion)
upgradable, err := docker.IsContainerUpgradable(ctx, host.DClient, imageCfg, hostCfg, service, host.Address, ControlRole)
if err != nil {
if client.IsErrNotFound(err) {
// doDeployControlHost should be called so this container gets recreated
logrus.Debugf("[%s] Host %v is upgradable because %v needs to run", ControlRole, host.HostnameOverride, service)
return true, nil
}
return false, err
}
if upgradable {
logrus.Debugf("[%s] Host %v is upgradable because %v has changed", ControlRole, host.HostnameOverride, service)
// host upgradable even if a single service is upgradable
return true, nil
}
}
logrus.Debugf("[%s] Host %v is not upgradable", ControlRole, host.HostnameOverride)
return false, nil
}
func RunGetStateFileFromConfigMap(ctx context.Context, controlPlaneHost *hosts.Host, prsMap map[string]v3.PrivateRegistry, dockerImage, k8sVersion string) (string, error) {
imageCfg := &container.Config{
Entrypoint: []string{"bash"},
Cmd: []string{
"-c",
"kubectl --kubeconfig /etc/kubernetes/ssl/kubecfg-kube-node.yaml -n kube-system get configmap full-cluster-state -o json | jq -r .data.\\\"full-cluster-state\\\" | jq -r . > /tmp/configmap.cluster.rkestate",
},
Image: dockerImage,
}
hostCfg := &container.HostConfig{
NetworkMode: container.NetworkMode("host"),
RestartPolicy: container.RestartPolicy{Name: "no"},
}
binds := []string{
fmt.Sprintf("%s:/etc/kubernetes:z", path.Join(controlPlaneHost.PrefixPath, "/etc/kubernetes")),
}
matchedRange, err := util.SemVerMatchRange(k8sVersion, util.SemVerK8sVersion122OrHigher)
if err != nil {
return "", err
}
if matchedRange {
if hosts.IsDockerSELinuxEnabled(controlPlaneHost) {
// We configure the label because we do not rewrite SELinux labels anymore on volume mounts (no :z)
logrus.Debugf("Configuring security opt label [%s] for [%s] container on host [%s]", SELinuxLabel, ControlPlaneConfigMapStateFileContainerName, controlPlaneHost.Address)
hostCfg.SecurityOpt = append(hostCfg.SecurityOpt, SELinuxLabel)
}
binds = util.RemoveZFromBinds(binds)
}
hostCfg.Binds = binds
if err := docker.DoRemoveContainer(ctx, controlPlaneHost.DClient, ControlPlaneConfigMapStateFileContainerName, controlPlaneHost.Address); err != nil {
return "", err
}
if err := docker.DoRunOnetimeContainer(ctx, controlPlaneHost.DClient, imageCfg, hostCfg, ControlPlaneConfigMapStateFileContainerName, controlPlaneHost.Address, ControlRole, prsMap); err != nil {
return "", err
}
statefile, err := docker.ReadFileFromContainer(ctx, controlPlaneHost.DClient, controlPlaneHost.Address, ControlPlaneConfigMapStateFileContainerName, "/tmp/configmap.cluster.rkestate")
if err != nil {
return "", err
}
if err := docker.DoRemoveContainer(ctx, controlPlaneHost.DClient, ControlPlaneConfigMapStateFileContainerName, controlPlaneHost.Address); err != nil {
return "", err
}
return statefile, nil
}