1. kubectl介绍

kubectl controls the Kubernetes cluster manager.

Usage:
kubectl [flags]
kubectl [command]

[root@k8s-master01 ~]# kubectl --help
kubectl controls the Kubernetes cluster manager.
Find more information at https://github.com/kubernetes/kubernetes.
Usage:kubectl [flags]kubectl [command]
Available Commands:get            Display one or many resourcesdescribe       Show details of a specific resource or group of resourcescreate         Create a resource by filename or stdinreplace        Replace a resource by filename or stdin.patch          Update field(s) of a resource by stdin.delete         Delete resources by filenames, stdin, resources and names, or by resources and label selector.edit           Edit a resource on the serverapply          Apply a configuration to a resource by filename or stdinnamespace      SUPERSEDED: Set and view the current Kubernetes namespacelogs           Print the logs for a container in a pod.restart        Restart a container in a pod.rolling-update Perform a rolling update of the given ReplicationController.scale          Set a new size for a Replication Controller.attach         Attach to a running container.exec           Execute a command in a container.port-forward   Forward one or more local ports to a pod.proxy          Run a proxy to the Kubernetes API serverrun            Run a particular image on the cluster.stop           Deprecated: Gracefully shut down a resource by name or filename.expose         Take a replication controller, service or pod and expose it as a new Kubernetes Serviceautoscale      Auto-scale a replication controllerlabel          Update the labels on a resourceannotate       Update the annotations on a resourceconfig         config modifies kubeconfig filescluster-info   Display cluster infoapi-versions   Print the supported API versions on the server, in the form of "group/version".version        Print the client and server version information.help           Help about any command
Flags:--alsologtostderr[=false]: log to standard error as well as files--api-version="": The API version to use when talking to the server--certificate-authority="": Path to a cert. file for the certificate authority.--client-certificate="": Path to a client key file for TLS.--client-key="": Path to a client key file for TLS.--cluster="": The name of the kubeconfig cluster to use--context="": The name of the kubeconfig context to use--insecure-skip-tls-verify[=false]: If true, the server's certificate will not be checked for validity. This will make your HTTPS connectionsinsecure.--kubeconfig="": Path to the kubeconfig file to use for CLI requests.--log-backtrace-at=:0: when logging hits line file:N, emit a stack trace--log-dir="": If non-empty, write log files in this directory--log-flush-frequency=5s: Maximum number of seconds between log flushes--logtostderr[=true]: log to standard error instead of files--match-server-version[=false]: Require server version to match client version--namespace="": If present, the namespace scope for this CLI request.--password="": Password for basic authentication to the API server.-s, --server="": The address and port of the Kubernetes API server--stderrthreshold=2: logs at or above this threshold go to stderr--token="": Bearer token for authentication to the API server.--user="": The name of the kubeconfig user to use--username="": Username for basic authentication to the API server.--v=0: log level for V logs--vmodule=: comma-separated list of pattern=N settings for file-filtered loggingUse "kubectl [command] --help" for more information about a command.

2. 操作的资源对象

Node
Podes
Replication Controllers
Services
Namespace
ComponentStatus

3. kubectl命令分类[command]

3.1 增
 

1）create:[Create a resource by filename or stdin]
2）run:[ Run a particular image on the cluster]3）apply:[Apply a configuration to a resource by filename or stdin]4）proxy:[Run a proxy to the Kubernetes API server ]

3.2 删

1）delete:[Delete resources ]

3.3 改

1）scale:[Set a new size for a Replication Controller]2）exec:[Execute a command in a container]3）attach:[Attach to a running container]4）patch:[Update field(s) of a resource by stdin]5）edit:[Edit a resource on the server]6） label:[Update the labels on a resource]7）annotate:[Auto-scale a replication controller]8）replace:[Replace a resource by filename or stdin]9）config:[config modifies kubeconfig files]

3.4 查

1）get:[Display one or many resources]2）describe:[Show details of a specific resource or group of resources]3）log:[Print the logs for a container in a pod]4）cluster-info:[Display cluster info]5） version:[Print the client and server version information]6）api-versions:[Print the supported API versions]

4. 配置K8S环境

4.1 非安全方式
 

kubectl config set-cluster k8s --server=http://<url> 
kubectl config set-context <namespace> --cluster=k8s --namespace=<namespace> kubectl config use-context <namespace> 

4.2 安全方式

kubectl config set-cluster k8s --server=https://<url> --insecure-skip-tls-verify=true
kubectl config set-credentials k8s-user --username=<username> --password=<password>kubectl config set-context <namespace> --cluster=k8s --user=k8s-user --namespace=<namespace> 
kubectl config use-context <namespace>

4.3 查询当前配置环境

[root@k8s-node01 ]# kubectl cluster-info
Kubernetes master is running at http://192.168.19.2:8081

5. Pod相关命令

5.1 查询Pod

kubectl get pod -o wide --namespace=<NAMESPACE>

5.2 进入Pod

kubectl exec -it <Pod_NAME> /bin/bash --namespace=<namespace>

5.3 删除Pod

kubectl delete pod <pod-name>

5.4 日志查看
1 $ 查看运行容器日志 

kubectl logs wsop-proxy-1-0-9-ii97y --namespace=<namespace>

2 $ 查看上一个挂掉的容器日志 

kubectl logs wsop-proxy-1-0-9-ii97y -p --namespace=<namespace> 

6. Node隔离与恢复

说明：Node设置隔离之后，原先运行在该Node上的Pod不受影响，后续的Pod不会调度到被隔离的Node上。

1. Node隔离

kubectl patch node <NodeName> -p '{"spec":{"unschedulable":true}}'

2. Node恢复

kubectl patch node <NodeName> -p '{"spec":{"unschedulable":false}}'

7. kubectl label

7.1 固定Pod到指定机器

kubectl label node <NodeName> namespace/<NAMESPACE>=true

2. 取消Pod固定机器

kubectl label node <NodeName> namespace/<NAMESPACE>-

8. kubectl 自动补全

# for linux
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc