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add fault inject for kube proxy #384
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xiaojingchen
merged 5 commits into
pingcap:master
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onlymellb:add-fault-inject-for-kube-proxy
Apr 19, 2019
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1e315a3
fix typo
4b7d020
support for start and stop kube-proxy for each k8s node
333eab4
add KubeProxyLabel template variable
7453355
add StartKubeProxy and StopKubeProxy method into Client interface
a45fbcd
merge branch master into add-fault-inject-for-kube-proxy
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| // Copyright 2019 PingCAP, Inc. | ||
| // | ||
| // 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package manager | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
| "os/exec" | ||
| "path/filepath" | ||
|
|
||
| "github.com/golang/glog" | ||
|
|
||
| "github.com/pingcap/tidb-operator/tests/pkg/util" | ||
| ) | ||
|
|
||
| const ( | ||
| kubeProxyPath = "/etc/kubernetes/kube-proxy" | ||
| kubeProxyManifest = "kube-proxy-ds.yml" | ||
| kubeProxyLabel = "app.kubernetes.io/kube-proxy" | ||
| ) | ||
|
|
||
| // UpdateKubeProxyDaemonset add node affinity for previous kube-proxy daemonset | ||
| func (m *Manager) UpdateKubeProxyDaemonset(hostname string) error { | ||
| kubectlPath, err := getKubectlPath() | ||
| if err != nil { | ||
| glog.Infof("skip update kube-proxy daemonset, err: %v", err) | ||
| return nil | ||
| } | ||
|
|
||
| // Get all k8s master nodes | ||
| k8sMasterNodes, err := util.ListK8sNodes(kubectlPath, fmt.Sprintf("%s=", util.LabelNodeRoleMaster)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Select the first k8s master node to execute the update operation | ||
| if hostname != k8sMasterNodes[0] { | ||
| glog.Infof("not the first k8s master node, skip update kube-proxy daemonset, node name: %s", hostname) | ||
| return nil | ||
| } | ||
|
|
||
| // Ensure kubeProxyPath exists | ||
| err = util.EnsureDirectoryExist(kubeProxyPath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Render kub-proxy daemonset's template | ||
| kubeProxyManifestFullPath := filepath.Join(kubeProxyPath, kubeProxyManifest) | ||
| f, err := os.Create(kubeProxyManifestFullPath) | ||
| if err != nil { | ||
| return fmt.Errorf("create file %s failed, err: %v", kubeProxyManifestFullPath, err) | ||
| } | ||
| defer f.Close() | ||
| proxyDaemonSetBytes, err := util.ParseTemplate(KubeProxyDaemonSet, struct{ Image, KubeProxyLabel string }{ | ||
| Image: m.kubeProxyImages, | ||
| KubeProxyLabel: kubeProxyLabel, | ||
| }) | ||
| if err != nil { | ||
| return fmt.Errorf("parsing kube-proxy daemonset template failed, err: %v", err) | ||
| } | ||
| _, err = f.Write(proxyDaemonSetBytes) | ||
| if err != nil { | ||
| return fmt.Errorf("write kube-proxy daemonset manifest into file %s failed, err: %v", kubeProxyManifestFullPath, err) | ||
| } | ||
|
|
||
| // Apply kube-proxy daemonset manifest | ||
| commandStr := fmt.Sprintf("%s apply -f %s", kubectlPath, kubeProxyManifestFullPath) | ||
| cmd := exec.Command("/bin/sh", "-c", commandStr) | ||
| output, err := cmd.CombinedOutput() | ||
| if err != nil { | ||
| return fmt.Errorf("exec: [%s] failed, output: %s, error: %v", commandStr, string(output), err) | ||
| } | ||
|
|
||
| // Add app.kubernetes.io/kube-proxy= label for all k8s nodes | ||
| allK8sNodes, err := util.ListK8sNodes(kubectlPath, "") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for _, node := range allK8sNodes { | ||
| err := addKubeProxyLabel(kubectlPath, node) | ||
| if err != nil { | ||
| glog.Error(err) | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| glog.Infof("update kube-proxy daemonset success") | ||
| return nil | ||
| } | ||
|
|
||
| // StartKubeProxy start kube-proxy of the specified node | ||
| func (m *Manager) StartKubeProxy(nodeName string) error { | ||
| kubectlPath, err := getKubectlPath() | ||
| if err != nil { | ||
| glog.Error(err) | ||
| return err | ||
| } | ||
| err = addKubeProxyLabel(kubectlPath, nodeName) | ||
| if err != nil { | ||
| glog.Error(err) | ||
| return err | ||
| } | ||
|
|
||
| glog.Infof("node %s kube-proxy is started", nodeName) | ||
| return nil | ||
| } | ||
|
|
||
| // StopKubeProxy stop kube-proxy of the specified node | ||
| func (m *Manager) StopKubeProxy(nodeName string) error { | ||
| kubectlPath, err := getKubectlPath() | ||
| if err != nil { | ||
| glog.Error(err) | ||
| return err | ||
| } | ||
| commandStr := fmt.Sprintf("%s label no %s %s-", kubectlPath, nodeName, kubeProxyLabel) | ||
| cmd := exec.Command("/bin/sh", "-c", commandStr) | ||
| output, err := cmd.CombinedOutput() | ||
| if err != nil { | ||
| glog.Errorf("remove kube-proxy label failed, command: [%s], output: %s, error: %v", commandStr, string(output), err) | ||
| return err | ||
| } | ||
|
|
||
| glog.Infof("node %s kube-proxy is stoped", nodeName) | ||
| return nil | ||
| } | ||
|
|
||
| func getKubectlPath() (string, error) { | ||
| paths := filepath.SplitList(os.Getenv("PATH")) | ||
| kubectlPath, err := util.FindInPath("kubectl", paths) | ||
| if err != nil { | ||
| return "", fmt.Errorf("can't found kubectl binary, not deployed on the k8s master node, err: %v", err) | ||
| } | ||
| return kubectlPath, nil | ||
| } | ||
|
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||
| func addKubeProxyLabel(kubectlPath, nodeName string) error { | ||
| commandStr := fmt.Sprintf("%s label no %s %s= --overwrite", kubectlPath, nodeName, kubeProxyLabel) | ||
| cmd := exec.Command("/bin/sh", "-c", commandStr) | ||
| output, err := cmd.CombinedOutput() | ||
| if err != nil { | ||
| return fmt.Errorf("add kube-proxy label failed, command: [%s], output: %s, error: %v", commandStr, string(output), err) | ||
| } | ||
| return nil | ||
| } | ||
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why not use kubeClient to update proxy's daemonSet?