kubectl 操作记录

设置 master

kubectl label node node-master.foo.bar kubernetes.io/role=master
node "node-master.foo.bar" labeled

查看集群组件信息

kubectl get cs

查看集群的 master api 地址

kubectl cluster-info
kubectl cluster-info dump

查看集群的各种资源类型

kubectl api-resources | grep  istio

kubectl get pods --namespace=kube-system

强制删除 pod

kubectl delete pod nginx-1849696770-2pk8t -n myspace --grace-period=0 --force

转发一个端口

kubectl -n monitoring port-forward deployment/getup-grafana 3000:3000
kubectl -n monitoring port-forward alertmanager-getup-prometheus-operator-alertmanager-0 9093:9093
kubectl -n monitoring port-forward prometheus-getup-prometheus-operator-prometheus-0 9090:9090

exec 执行长命令被截断，需要用 —

kubectl exec $POD_NAME tail -n 10 /var/log/newrelic_agent.log
Error from server (NotFound): namespaces "10" not found
应该用
kubectl exec $POD_NAME -- tail -n 10 /var/log/newrelic_agent.log
或
kubectl exec $POD_NAME -- bash -c "tail -n 10 /var/log/newrelic_agent.log"

查看所有事件

kubectl get events

kubectl -n istio-system port-forward prometheus-6cabcdab97-mwptl 18080:9090
kubectl -n istio-system port-forward grafana-fabcd765b-vtcxp 18080:3000
kubectl -n istio-system port-forward kiali-8babb947c-b5g5m 18080:20001

kubectl api-resources

app=account_service
kubectl logs --tail 10 -f -l app=$app -n default -c $app

kubectl get secret config1 -o json | jq '.data | map_values(@base64d)'

kubectl get all -n jenkins

NAME                         READY   STATUS    RESTARTS   AGE
pod/jenkins-8d6cc58f-dnfv6   1/1     Running   0          3d5h

NAME                           TYPE           CLUSTER-IP     EXTERNAL-IP    PORT(S)           AGE
service/jenkins                ClusterIP      10.31.30.9             80/TCP            544d
service/jenkins-agent          LoadBalancer   10.31.25.64   172.170.0.41    50000:21700/TCP   544d
service/jenkins-agent-public   LoadBalancer   10.31.25.94   xx.xx.xx.xxx   50000:22289/TCP   402d

NAME                      READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/jenkins   1/1     1            1           544d

NAME                                 DESIRED   CURRENT   READY   AGE
replicaset.apps/jenkins-7f57bfbd76   0         0         0       544d
replicaset.apps/jenkins-8d6cc58f     1         1         1       367d

查看 pod 的名字

for pod in `kubectl get pods -n dev -o jsonpath={.items..metadata.name} `; do kubectl get pod $pod -n dev ; done

查看 svc 的 ip

kubectx | grep gke_ | while read line; do echo $line; kubectl --context $line get svc istio-ingressgateway -n istio-system -o jsonpath='{.status.loadBalancer.ingress[0].ip}'; echo; done

查看 image 和 containerID

kubectl get pods -n dev -o jsonpath='{range .items[*].status.containerStatuses[*]}{.image}{"\n"}{.containerID}{"\n\n"}{end}' 

用 go template

kubectl get nodes -l cloud.google.com/machine-family=n1 -o go-template='{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}'