forked from coreos/etcd-operator
/
self_hosted.go
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/
self_hosted.go
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// Copyright 2016 The etcd-operator Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cluster
import (
"fmt"
"math"
"time"
"github.com/coreos/etcd-operator/pkg/util/etcdutil"
"github.com/coreos/etcd-operator/pkg/util/k8sutil"
"github.com/coreos/etcd-operator/pkg/util/retryutil"
"github.com/pborman/uuid"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
)
// selectSchedulableNodes finds all nodes that the etcd pod can be placed.
// The selected nodes must satisfy the node selector and are in ready state.
func (c *Cluster) selectSchedulableNodes() ([]string, error) {
var selector string
if c.cluster.Spec.Pod != nil && len(c.cluster.Spec.Pod.NodeSelector) != 0 {
selector = labels.SelectorFromSet(c.cluster.Spec.Pod.NodeSelector).String()
}
nodes, err := c.config.KubeCli.CoreV1().Nodes().List(metav1.ListOptions{
LabelSelector: selector,
})
if err != nil {
return nil, fmt.Errorf("failed to list master nodes: %v", err)
}
// TODO: take taints into consideration? k8s might support schedule dryrun for other
// components to test schedulability though...
ns := make([]string, 0)
for _, n := range nodes.Items {
if k8sutil.IsNodeReady(n) {
ns = append(ns, n.Name)
}
}
return ns, nil
}
func (c *Cluster) waitNewMember(oldN, retries int, name string) error {
return retryutil.Retry(10*time.Second, retries, func() (bool, error) {
err := c.updateMembers(c.members)
if err != nil {
c.logger.Warningf("unable to update members: %v", err)
return false, nil
}
if c.members.Size() > oldN {
return true, nil
}
c.logger.Infof("still waiting for the new self hosted member (%s) to start...", name)
return false, nil
})
}
func (c *Cluster) changePodToNoopIfNotScheduled(name, ns string) string {
var nodeName string
retryutil.Retry(10*time.Second, math.MaxInt64, func() (bool, error) {
pod, err := c.config.KubeCli.CoreV1().Pods(ns).Get(name, metav1.GetOptions{})
if err != nil {
c.logger.Errorf("failed to check if pod (%s) is scheduled: %v", name, err)
return false, nil
}
nodeName = pod.Spec.NodeName
if len(nodeName) != 0 {
return true, nil
}
// If the pod hasn't bound to any node, we should delete the pod with version to make sure no kubelet
// would run it. But current API doesn't provide that. We need to CAS the pod's command to make sure it won't
// add member.
pod.Spec.Containers[0].Image = "busybox"
_, err = c.config.KubeCli.CoreV1().Pods(ns).Update(pod)
if err != nil {
c.logger.Errorf("failed to updated the unscheduled pod (%s) to noop pod: %v", name, err)
return false, nil
}
return true, nil
})
return nodeName
}
func (c *Cluster) inspectSelfHostedMember(memberName, podName, ns string, oldN int) {
nodeName := c.changePodToNoopIfNotScheduled(podName, ns)
// If a pod has been bound to a node, we could not know whether it had been run by kubelet.
if len(nodeName) != 0 {
c.logger.Infof("pod (%s) has been scheduled to node (%s), waiting for the pod to come up...", podName, nodeName)
c.waitNewMember(oldN, math.MaxInt64, memberName)
return
}
c.logger.Warningf("failed to add member (%s) due to scheduling failure. Removing its pod (%s)", memberName, podName)
// Our reconcile loop assumes that no new member is added without control.
// When we come to this point, we have assumed that the new member won't be added by any case.
// Thus, it is safe to remove the pod.
retryutil.Retry(10*time.Second, math.MaxInt64, func() (bool, error) {
err := c.removePod(memberName)
if err != nil {
c.logger.Errorf("failed to delete pod (%s), retry later: %v", memberName, err)
return false, nil
}
c.logger.Infof("pod (%s) has been removed", podName)
return true, nil
})
}
func (c *Cluster) addOneSelfHostedMember() error {
selectedNodes, err := c.selectSchedulableNodes()
if err != nil {
return err
}
if nodeNum := len(selectedNodes); nodeNum < c.cluster.Spec.Size {
c.logger.Warningf("cannot scale to size (%d), only have %d nodes (%v)", c.cluster.Spec.Size, nodeNum, selectedNodes)
return nil
}
c.status.AppendScalingUpCondition(c.members.Size(), c.cluster.Spec.Size)
newMember := c.newMember(c.memberCounter)
c.memberCounter++
peerURL := newMember.PeerURL()
initialCluster := append(c.members.PeerURLPairs(), newMember.Name+"="+peerURL)
ns := c.cluster.Namespace
pod := k8sutil.NewSelfHostedEtcdPod(newMember, initialCluster, c.members.ClientURLs(), c.cluster.Name, "existing", "", c.cluster.Spec, c.cluster.AsOwner())
_, err = c.config.KubeCli.CoreV1().Pods(ns).Create(pod)
if err != nil {
return err
}
if c.isDebugLoggerEnabled() {
c.debugLogger.LogPodCreation(pod)
}
// wait for the new pod to start and add itself into the etcd cluster.
oldN := c.members.Size()
err = c.waitNewMember(oldN, 6, newMember.Name)
if err != nil {
c.logger.Warningf("new member (%s) is still not added. Doing more inspection...", newMember.Name)
c.inspectSelfHostedMember(newMember.Name, pod.Name, ns, oldN)
return nil
}
c.logger.Infof("added a self-hosted member (%s)", newMember.Name)
return nil
}
func (c *Cluster) newSelfHostedSeedMember() error {
newMember := c.newMember(c.memberCounter)
c.memberCounter++
initialCluster := []string{newMember.Name + "=" + newMember.PeerURL()}
pod := k8sutil.NewSelfHostedEtcdPod(newMember, initialCluster, nil, c.cluster.Name, "new", uuid.New(), c.cluster.Spec, c.cluster.AsOwner())
_, err := k8sutil.CreateAndWaitPod(c.config.KubeCli, c.cluster.Namespace, pod, 3*60*time.Second)
if err != nil {
return err
}
if c.isDebugLoggerEnabled() {
c.debugLogger.LogPodCreation(pod)
}
c.logger.Infof("self-hosted cluster created with seed member (%s)", newMember.Name)
return nil
}
func (c *Cluster) migrateBootMember() error {
endpoint := c.cluster.Spec.SelfHosted.BootMemberClientEndpoint
c.logger.Infof("migrating boot member (%s)", endpoint)
resp, err := etcdutil.ListMembers([]string{endpoint}, c.tlsConfig)
if err != nil {
return fmt.Errorf("failed to list members from boot member (%v)", err)
}
if len(resp.Members) != 1 {
return fmt.Errorf("boot cluster contains more than one member")
}
bootMember := resp.Members[0]
initialCluster := make([]string, 0)
for _, purl := range bootMember.PeerURLs {
initialCluster = append(initialCluster, fmt.Sprintf("%s=%s", bootMember.Name, purl))
}
// create the member inside Kubernetes for migration
newMember := c.newMember(c.memberCounter)
c.memberCounter++
peerURL := newMember.PeerURL()
initialCluster = append(initialCluster, newMember.Name+"="+peerURL)
pod := k8sutil.NewSelfHostedEtcdPod(newMember, initialCluster, []string{endpoint}, c.cluster.Name, "existing", "", c.cluster.Spec, c.cluster.AsOwner())
ns := c.cluster.Namespace
_, err = k8sutil.CreateAndWaitPod(c.config.KubeCli, ns, pod, 3*60*time.Second)
if err != nil {
return err
}
if c.isDebugLoggerEnabled() {
c.debugLogger.LogPodCreation(pod)
}
if c.cluster.Spec.SelfHosted.SkipBootMemberRemoval {
c.logger.Infof("skipping boot member (%s) removal; you will need to remove it yourself", endpoint)
} else {
c.logger.Infof("beginning the process of removing boot member (%s) from the cluster", endpoint)
go func() {
// TODO: a shorter timeout?
// Waiting here for cluster to get stable:
// - etcd data are replicated;
// - cluster CR state has switched to "Running"
delay := 60 * time.Second
c.logger.Infof("waiting %v before removing the boot member", delay)
time.Sleep(delay)
err = etcdutil.RemoveMember([]string{newMember.ClientURL()}, c.tlsConfig, bootMember.ID)
if err != nil {
c.logger.Errorf("boot member migration: failed to remove the boot member (%v)", err)
}
}()
}
c.logger.Infof("self-hosted cluster created with boot member (%s)", endpoint)
return nil
}