资源清单简介

资源清单的格式

apiVersion: group/version //指明api资源属于哪个群组和版本，同一个组
可以有多个版本
kubectl api-versions //查询命令
• kind: //标记创建的资源类型，k8s主要支持以下资源类别 Pod,ReplicaSet,Deployment,StatefulSet,DaemonSet,Job,Cronjob
• metadata: //元数据 name: //对像名称
namespace: //对象属于哪个命名空间 labels: //指定资源标签，标签是一种键值数据
• spec: //定义目标资源的期望状态

#kubectl explain pod //查询帮助文档

创建自主式POD资源清单

$ vim demo.yaml

apiVersion: v1 
kind: Pod 
metadata:
  name: demo 
  labels:
    app: demo 
spec:
  containers:
  - name: ubuntu
    image: ubuntu
    command: ["/bin/sh", "-c", "sleep 3600"] 
  - name: nginx
    image: nginx

创建自主式pod
kubectl create -f demo.yaml

删除自主式pod
kubectl deleate -f demo.yaml

标签

$ kubectl get pod --show-labels //查看标签 

NAME READY STATUS RESTARTS AGE LABELS
demo 2/2 Running 0 8s app=demo

• $ kubectl get pod -l app

NAME READY STATUS RESTARTS AGE demo 2/2 Running 0 34s
//过滤包含app的标签 NAME READY STATUS RESTARTS AGE APP

• $ kubectl get pod -L app

demo 2/2 Running 0 39s demo

$ kubectl label pod demo version=v1 //打标签

pod/demo labeled

• $ kubectl get pod --show-labels

NAME READY STATUS RESTARTS AGE LABELS demo 2/2 Running 0 4m1s app=demo,version=v1

• $ kubectl label pod demo app=nginx --overwrite //更改标签

pod/demo labeled

• $ kubectl get pod --show-labels

NAME READY STATUS RESTARTS AGE LABELS demo 2/2 Running 0 5m40s app=nginx,version=v1

节点标签选择器

$ kubectl label nodes server2 disktype=ssd

node/server2 labeled

$ kubectl get nodes -l disktype

NAME STATUS ROLES AGE VERSION
server2 Ready 6d v1.17.2

在yaml文件中增加标签选择器

$ kubectl delete -f demo.yml 
 pod "demo" deleted
 $ kubectl create -f demo.yaml 
 pod/demo created
 $ kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE 
demo 2/2 Running 0 2m16s 10.244.1.44 server2