###  kubectl create deployment my-nginx --image=nginxapiVersion: apps/v1kind: Deploymentmetadata:  annotations:    deployment.kubernetes.io/revision: "1"  creationTimestamp: "2022-05-27T11:37:59Z"  generation: 1  labels:    app: my-nginx  name: my-nginx  namespace: default  resourceVersion: "376418"  uid: 5a47e879-e2e9-40d1-8b02-180031903e8aspec:  ###期望状态  progressDeadlineSeconds: 600  replicas: 1  ### 副本数量  revisionHistoryLimit: 10  selector:    matchLabels:      app: my-nginx  strategy:    rollingUpdate:      maxSurge: 25%      maxUnavailable: 25%    type: RollingUpdate  template:    metadata:      creationTimestamp: null      labels:        app: my-nginx    spec:      containers:       - image: nginx   ###使用这个镜像创建容器        imagePullPolicy: Always        name: nginx        resources: {}        terminationMessagePath: /dev/termination-log        terminationMessagePolicy: File      dnsPolicy: ClusterFirst      restartPolicy: Always      schedulerName: default-scheduler      securityContext: {}      terminationGracePeriodSeconds: 30status:  ###当前状态  availableReplicas: 1  ## 当前集群可用的  conditions:  - lastTransitionTime: "2022-05-27T11:38:17Z"    lastUpdateTime: "2022-05-27T11:38:17Z"    message: Deployment has minimum availability.    reason: MinimumReplicasAvailable    status: "True"    type: Available  - lastTransitionTime: "2022-05-27T11:37:59Z"    lastUpdateTime: "2022-05-27T11:38:17Z"    message: ReplicaSet "my-nginx-6b74b79f57" has successfully progressed.    reason: NewReplicaSetAvailable    status: "True"    type: Progressing  observedGeneration: 1  readyReplicas: 1  replicas: 1  updatedReplicas: 1        ### 最终一致。  ## etcd保存的创建资源期望的状态和最终这个资源的状态要是一致的；spec和status要最终一致  ## 1、kubectl create deployment my-nginx --image=nginx  ## 2、api-server保存etcd，controller-manager最终解析数据，知道集群要my-nginx一份，保存到etcd  ## 3、kubelet就做一件事情，spec状态和最终状态一致  while(true){    if(my-nginx.replicas != spec.replicas)       {          kubelet.startPod();       }  }

kind: Pod          #资源类型  kubectl api-resources:可以获取到所有资源apiVersion: v1     #同一个资源有可能有多个版本。看 kubectl api-resources提示的。metadata:          #每一个资源定义一些元数据信息  labels:    run: my-tomcat  name: my-tomcatspec:			   #资源的规格（镜像名、镜像的环境变量信息等等）  containers:  - image: tomcat    name: my-tomcat    resources: {}  dnsPolicy: ClusterFirst  restartPolicy: Always

#1、部署kubectl apply -f deployment.yaml
#2、移除kubectl delete -f deployment.yaml

#1、命令式kubectl run nginx --image nginx
kubectl create deployment nginx --image nginx
apply -f ： 没有就创建，有就修改#2、指令性- 使用指令性的对象配置（imperative object configuration）时，需要向 kubectl 命令指定具体的操作（create,replace,apply,delete等），可选参数以及至少一个配置文件的名字。配置文件中必须包括一个完整的对象的定义，可以是 yaml 格式，也可以是 json 格式。
#创建对象kubectl create -f nginx.yaml#删除对象kubectl delete -f nginx.yaml -f redis.yaml#替换对象kubectl replace -f nginx.yaml

#3、声明式#处理 configs 目录中所有配置文件中的Kubernetes对象，根据情况创建对象、或更新Kubernetes中已经存在的对象。可以先执行 diff 指令查看具体的变更，然后执行 apply 指令执行变更；kubectl diff -f configs/kubectl apply -f configs/

#递归处理目录中的内容：kubectl diff -R -f configs/kubectl apply -R -f configs/
#移除kubectl delete -f configs/

/api/v1/namespaces/{namespace}/pods/{name}

kubectl get namespaces
kubectl describe namespaces <name>
#隔离 mysql mapper.xml--》dao.

kubectl create -f ./my-namespace.yaml

#要为当前请求设置命名空间，请使用 --namespace 参数。
kubectl run nginx --image=nginx --namespace=<insert-namespace-name-here>kubectl get pods --namespace=<insert-namespace-name-here>

# In a namespacekubectl api-resources --namespaced=true
# Not in a namespacekubectl api-resources --namespaced=false

kubectl get pods -l environment=production,tier=frontend# 选择了标签名为 `environment` 且 标签值为 `production` 的Kubernetes对象environment = production# 选择了标签名为 `tier` 且标签值不等于 `frontend` 的对象，以及不包含标签 `tier` 的对象tier != frontend

Set-based 标签选择器可以根据标签名的一组值进行筛选。支持的操作符有三种：in、notin、exists。例如# 选择所有的包含 `environment` 标签且值为 `production` 或 `qa` 的对象environment in (production, qa)# 选择所有的 `tier` 标签不为 `frontend` 和 `backend`的对象，或不含 `tier` 标签的对象tier notin (frontend, backend)# 选择所有包含 `partition` 标签的对象partition# 选择所有不包含 `partition` 标签的对象!partition
# 选择包含 `partition` 标签（不检查标签值）且 `environment` 不是 `qa` 的对象partition,environment notin (qa)

kubectl get pods -l 'environment in (production),tier in (frontend)'

#Job、Deployment、ReplicaSet 和 DaemonSet 同时支持基于等式的选择方式和基于集合的选择方式。例如：selector:  matchLabels:    component: redis  matchExpressions:    - {key: tier, operator: In, values: [cache]}    - {key: environment, operator: NotIn, values: [dev]}
# matchLabels 是一个 {key,value} 组成的 map。map 中的一个 {key,value} 条目相当于 matchExpressions 中的一个元素，其 key 为 map 的 key，operator 为 In， values 数组则只包含 value 一个元素。matchExpression 等价于基于集合的选择方式，支持的 operator 有 In、NotIn、Exists 和 DoesNotExist。当 operator 为 In 或 NotIn 时，values 数组不能为空。所有的选择条件都以 AND 的形式合并计算，即所有的条件都满足才可以算是匹配

#添加或者修改标签kubectl label --help# Update pod 'foo' with the label 'unhealthy' and the value 'true'.kubectl label pods foo unhealthy=true
# Update pod 'foo' with the label 'status' and the value 'unhealthy', overwriting any existing value.kubectl label --overwrite pods foo status=unhealthy
# Update all pods in the namespacekubectl label pods --all status=unhealthy
# Update a pod identified by the type and name in "pod.json"kubectl label -f pod.json status=unhealthy
# Update pod 'foo' only if the resource is unchanged from version 1.kubectl label pods foo status=unhealthy --resource-version=1
# Update pod 'foo' by removing a label named 'bar' if it exists.# Does not require the --overwrite flag.kubectl label pods foo bar-

kubectl get pods --field-selector status.phase=Running

Basic Commands (Beginner): 初学者掌握的命令  create        Create a resource from a file or from stdin.  expose        Take a replication controller, service, deployment or pod and expose it as a newKubernetes Service  run           Run a particular image on the cluster  set           Set specific features on objects
Basic Commands (Intermediate): 基础命令  explain       Documentation of resources  get           Display one or many resources  edit          Edit a resource on the server  delete        Delete resources by filenames, stdin, resources and names, or by resources and labelselector
Deploy Commands:   #部署用的命令  rollout       Manage the rollout of a resource  scale         Set a new size for a Deployment, ReplicaSet or Replication Controller  autoscale     Auto-scale a Deployment, ReplicaSet, StatefulSet, or ReplicationController
Cluster Management Commands:  #集群管理的命令  certificate   Modify certificate resources.  cluster-info  Display cluster info  top           Display Resource (CPU/Memory) usage.  cordon        Mark node as unschedulable  uncordon      Mark node as schedulable  drain         Drain node in preparation for maintenance  taint         Update the taints on one or more nodes
Troubleshooting and Debugging Commands:  # debug的命令  describe      Show details of a specific resource or group of resources  logs          Print the logs for a container in a pod  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 server  cp            Copy files and directories to and from containers.  auth          Inspect authorization  debug         Create debugging sessions for troubleshooting workloads and nodes
Advanced Commands:  # 高阶命令  diff          Diff live version against would-be applied version  apply         Apply a configuration to a resource by filename or stdin  patch         Update field(s) of a resource  replace       Replace a resource by filename or stdin  wait          Experimental: Wait for a specific condition on one or many resources.  kustomize     Build a kustomization target from a directory or URL.
Settings Commands:  # 设置  label         Update the labels on a resource  annotate      Update the annotations on a resource  completion    Output shell completion code for the specified shell (bash or zsh) #
Other Commands:  #其他  api-resources Print the supported API resources on the server  api-versions  Print the supported API versions on the server, in the form of "group/version"  config        Modify kubeconfig files  plugin        Provides utilities for interacting with plugins.  version       Print the client and server version information

# 安装yum install bash-completion

# 自动补全echo 'source <(kubectl completion bash)' >>~/.bashrckubectl completion bash >/etc/bash_completion.d/kubectlsource /usr/share/bash-completion/bash_completion