3、kubernetes应用快速入门190625

一、kubernetes应用入门

1、kubectl命令

Basic Commands

  create         Create a resource from a file or from stdin.

  expose         Take a replication controller, service, deployment or pod and expose it as a new Kubernetes Service

  run            Run a particular image on the cluster

  set            Set specific features on objects

  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 label selector

Deploy Commands

  rollout        Manage the rollout of a resource

  scale          Set a new size for a Deployment, ReplicaSet, Replication Controller, or Job

  autoscale      Auto-scale a Deployment, ReplicaSet, or ReplicationController

Cluster Management Commands

  certificate    Modify certificate resources.

  cluster-info   Display cluster info

  top            Display Resource (CPU/Memory/Storage) 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

  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

Advanced Commands

  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 using strategic merge patch

  replace        Replace a resource by filename or stdin

  wait           Experimental: Wait for a specific condition on one or many resources.

  convert        Convert config files between different API versions

  kustomize      Build a kustomization target from a directory or a remote url.

Settings Commands

  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

  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

2、k8s使用快速入门

kubectl run和delete：创建一个deployment或者job控制器控制启动的容器

~]# kubectl run nginx-deploy --image=nginx:1.14 --port=80 --replicas=2

	--port=80：端口暴露

	--replicas=2：副本个数

	--dry-run=true：干跑一次

~]# kubectl delete pods nginx-deploy-bc9ff65dd-lj9bg  #删除pods，控制器会自动再起一个，让副本保持在2个

kubectl expose：创建service服务，为pod提供固定访问端点

~]# kubectl expose deployment nginx-deploy --name nginx-service --port=80 --target-port=80 --protocol=TCP

	deployment nginx-deploy：指定暴露的控制器下的pod

	--name nginx-service：service名称

	--port=80：service端口

	--target-port=80：后端pod端口

	--protocol=TCP：协议

kubectl get：获取资源信息

~]# kubectl get deployment

~]# kubectl get pods

~]# kubectl get pods -o wide  #查看pod运行的详细信息

~]# kubectl get pods --show-labels  #显示标签

~]# kubectl get pods -n kube-system -o wide  #显示system名称空间的详细信息

~]# kubectl get svc  #获取当前集群的svc

~]# kubectl get svc -n kube-system -o wide

kubectl edit：修改编辑资源

~]# kubectl edit svc nginx-service

kubectl describe：查看资源的详细信息

~]# kubectl describe svc nginx-service  #查询svc的详细信息

kubectl scale：扩展/缩减副本pod

~]# kubectl scale --replicas=3 deployment nginx-deploy

kubectl set：灰度升级镜像版本
kubectl rollout：回滚

3、使用示例

创建2个提供web的pod

~]# kubectl run myapp --image=dongfeimg/myapp:v1 --replicas=2

创建一个客户端pod

~]# kubectl run client --image=centos --replicas=1 -it --restart=Never

[root@client /]# curl 10.244.1.3

Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>

[root@client /]# curl 10.244.1.3/hostname.html

myapp-6fd6445cc6-5p676

为myapp创建一个service

~]# kubectl expose deployment myapp --name=myapp --port=80

在client测试，service可以实现轮询调度

[root@client /]# curl myapp/hostname.html

myapp-6fd6445cc6-2hx5h

[root@client /]# curl myapp/hostname.html

myapp-6fd6445cc6-5p676

将pod扩展至5个副本

~]# kubectl scale --replicas=5 deployment myapp

镜像升级（灰度）

~]# kubectl set image deployment myapp myapp=dongfeimg/myapp:v2

~]# kubectl rollout status deployment myapp  #查看更新进度

回滚上一版本

~]# kubectl rollout undo deployment myapp

4、补充：配置为可在集群外访问service

~]# kubectl edit svc myapp

type: NodePort

~]# kubectl get svc

myapp           NodePort    10.96.37.191   <none>        80:30804/TCP   17m

在集群外访问：http://${NODE_IP}:30804

巴特西

3、kubernetes应用快速入门190625

一、kubernetes应用入门

1、kubectl命令

2、k8s使用快速入门

3、使用示例

4、补充：配置为可在集群外访问service

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