forked from coreos/etcd-operator
/
gc.go
168 lines (146 loc) · 4.85 KB
/
gc.go
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// Copyright 2017 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 garbagecollection
import (
"github.com/coreos/etcd-operator/pkg/util/k8sutil"
"github.com/Sirupsen/logrus"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/pkg/api/v1"
"k8s.io/client-go/pkg/labels"
"k8s.io/client-go/pkg/types"
)
const (
NullUID = ""
)
var pkgLogger = logrus.WithField("pkg", "gc")
type GC struct {
logger *logrus.Entry
kubecli kubernetes.Interface
ns string
}
func New(kubecli kubernetes.Interface, ns string) *GC {
return &GC{
logger: pkgLogger,
kubecli: kubecli,
ns: ns,
}
}
// CollectCluster collects resources that matches cluster lable, but
// does not belong to the cluster with given clusterUID
func (gc *GC) CollectCluster(cluster string, clusterUID types.UID) {
gc.collectResources(k8sutil.ClusterListOpt(cluster), map[types.UID]bool{clusterUID: true})
}
// FullyCollect collects resources that were created before,
// but does not belong to any current running clusters.
func (gc *GC) FullyCollect() error {
clusters, err := k8sutil.GetClusterList(gc.kubecli.CoreV1().RESTClient(), gc.ns)
if err != nil {
return err
}
clusterUIDSet := make(map[types.UID]bool)
for _, c := range clusters.Items {
clusterUIDSet[c.Metadata.UID] = true
}
option := v1.ListOptions{
LabelSelector: labels.SelectorFromSet(map[string]string{
"app": "etcd",
}).String(),
}
gc.collectResources(option, clusterUIDSet)
return nil
}
func (gc *GC) collectResources(option v1.ListOptions, runningSet map[types.UID]bool) {
if err := gc.collectPods(option, runningSet); err != nil {
gc.logger.Errorf("gc pods failed: %v", err)
}
if err := gc.collectServices(option, runningSet); err != nil {
gc.logger.Errorf("gc services failed: %v", err)
}
if err := gc.collectReplicaSet(option, runningSet); err != nil {
gc.logger.Errorf("gc replica set failed: %v", err)
}
}
func (gc *GC) collectPods(option v1.ListOptions, runningSet map[types.UID]bool) error {
pods, err := gc.kubecli.CoreV1().Pods(gc.ns).List(option)
if err != nil {
return err
}
for _, p := range pods.Items {
if len(p.OwnerReferences) == 0 {
gc.logger.Warningf("failed to check pod %s: no owner", p.GetName())
continue
}
// Pods failed due to liveness probe are also collected
if !runningSet[p.OwnerReferences[0].UID] || p.Status.Phase == v1.PodFailed {
// kill bad pods without grace period to kill it immediately
err = gc.kubecli.CoreV1().Pods(gc.ns).Delete(p.GetName(), v1.NewDeleteOptions(0))
if err != nil && !k8sutil.IsKubernetesResourceNotFoundError(err) {
return err
}
gc.logger.Infof("deleted pod (%v)", p.GetName())
}
}
return nil
}
func (gc *GC) collectServices(option v1.ListOptions, runningSet map[types.UID]bool) error {
srvs, err := gc.kubecli.CoreV1().Services(gc.ns).List(option)
if err != nil {
return err
}
for _, srv := range srvs.Items {
if len(srv.OwnerReferences) == 0 {
gc.logger.Warningf("failed to check service %s: no owner", srv.GetName())
continue
}
if !runningSet[srv.OwnerReferences[0].UID] {
err = gc.kubecli.CoreV1().Services(gc.ns).Delete(srv.GetName(), nil)
if err != nil && !k8sutil.IsKubernetesResourceNotFoundError(err) {
return err
}
gc.logger.Infof("deleted service (%v)", srv.GetName())
}
}
return nil
}
func (gc *GC) collectReplicaSet(option v1.ListOptions, runningSet map[types.UID]bool) error {
rss, err := gc.kubecli.ExtensionsV1beta1().ReplicaSets(gc.ns).List(option)
if err != nil {
return err
}
for _, rs := range rss.Items {
if len(rs.OwnerReferences) == 0 {
gc.logger.Warningf("failed to check replica set %s: no owner", rs.GetName())
continue
}
if !runningSet[rs.OwnerReferences[0].UID] {
// set orphanOption to false to enable Kubernetes GC to remove the objects that
// depends on this replica set.
// See https://kubernetes.io/docs/user-guide/garbage-collection/ for more details.
orphanOption := false
// set gracePeriod to delete the replica set immediately
gracePeriod := int64(0)
err = gc.kubecli.ExtensionsV1beta1().ReplicaSets(gc.ns).Delete(rs.GetName(), &v1.DeleteOptions{
OrphanDependents: &orphanOption,
GracePeriodSeconds: &gracePeriod,
})
if err != nil {
if !k8sutil.IsKubernetesResourceNotFoundError(err) {
return err
}
}
gc.logger.Infof("deleted replica set (%s)", rs.GetName())
}
}
return nil
}