group_name/version

[root@master ~]# kubectl api-versions
admissionregistration.k8s.io/v1beta1
apiextensions.k8s.io/v1beta1
apiregistration.k8s.io/v1
apiregistration.k8s.io/v1beta1
apps/v1
apps/v1beta1
apps/v1beta2
authentication.k8s.io/v1
authentication.k8s.io/v1beta1
authorization.k8s.io/v1
authorization.k8s.io/v1beta1
autoscaling/v1
autoscaling/v2beta1
autoscaling/v2beta2
batch/v1
batch/v1beta1
certificates.k8s.io/v1beta1
coordination.k8s.io/v1
coordination.k8s.io/v1beta1
events.k8s.io/v1beta1
extensions/v1beta1
networking.k8s.io/v1
networking.k8s.io/v1beta1
node.k8s.io/v1beta1
policy/v1beta1
rbac.authorization.k8s.io/v1
rbac.authorization.k8s.io/v1beta1
scheduling.k8s.io/v1
scheduling.k8s.io/v1beta1
storage.k8s.io/v1
storage.k8s.io/v1beta1
v1

apiVersion: v1
kind: Pod
metadata:
  name: website
  labels:
    app: website
    role: frontend
spec:
  containers:
    - name: website
      image: nginx
      ports:
        - containerPort: 80

apiVersion: settings.k8s.io/v1alpha1
kind: PodPreset
metadata:
  name: allow-database
spec:
  selector:
    matchLabels:
      role: frontend
  env:
    - name: DB_PORT
      value: "6379"
  volumeMounts:
    - mountPath: /cache
      name: cache-volume
  volumes:
    - name: cache-volume
      emptyDir: {}

$ kubectl create -f preset.yaml
$ kubectl create -f pod.yaml

$ kubectl get pod website -o yaml
apiVersion: v1
kind: Pod
metadata:
  name: website
  labels:
    app: website
    role: frontend
  annotations:
    podpreset.admission.kubernetes.io/podpreset-allow-database: "resource version"
spec:
  containers:
    - name: website
      image: nginx
      volumeMounts:
        - mountPath: /cache
          name: cache-volume
      ports:
        - containerPort: 80
      env:
        - name: DB_PORT
          value: "6379"
  volumes:
    - name: cache-volume
      emptyDir: {}

apiVersion: v1
kind: Pod
metadata:
  name: pod-with-labels
  labels:
    env: qa
    tier: frontend
spec: 
  containers:
  - name: myapp
    image: ikubernetes/myapp:v1

/api/GROUP/VERSION/namespaces/NAMESPACE/RESOURCE_TYPE/NAME

apiVersion: v1
kind: Pod
metadata:
  name: pod-with-nodeselector
  annotations:
    xuxuehua.com/created-by: "cluster admin"
spec: 
....

apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod
spec:
  containers:
    - name: nginx
      image: nginx:latest
        imagePullPolicy: Always

containerPort <integer> 必选字段，指定Pod的IP地址暴露的容器端口 0-65536
name <string> 当前容器端口名称，在当前pod内需要唯一，此端口名可以被Service资源调用
protocol 可以为TCP或UDP，默认为TCP

apiVersion: v1
kind: Pod
metadata:
  name: pod-example
spec:
  containers:
    - name: myapp
      image: ikubernetes/myapp:v1
      ports:
        - name: http
          containerPort: 80
          protocol: TCP

apiVersion: v1
kind: Pod
metadata:
  name: pod-with-custom-command
spec:
  containers:
    - name: myapp
      image: alpine:latest
      command: ["/bin/sh"]
      args: ["-c", "while true; do sleep 30; done"]

apiVersion: v1
kind: Pod
metadata:
  name: lifecycle-demo
spec:
  containers:
  - name: lifecycle-demo-container
    image: nginx
    lifecycle:
      postStart:
        exec:
          command: ["/bin/sh", "-c", "echo Hello from the postStart handler > /usr/share/message"]
      preStop:
        exec:
          command: ["/usr/sbin/nginx","-s","quit"]

apiVersion: v1
kind: Pod
metadata:
  labels:
    test: liveness-exec
  name: liveness-exec
spec: 
  containers:
  - name: liveness-exec-demo
    image: busybox
    args: ["/bin/sh", "-c", "touch /tmp/healthy; sleep 60; rm -rf /tmp/healthy; sleep 600;"]
    livenessProbe:
      exec:
        command: ["test", "-e", "/tmp/healthy"]

apiVersion: v1
kind: Pod
metadata:
  labels:
    test: liveness
  name: liveness-http
spec:
  containers:
    - name: liveness-http-demo
      image: nginx:1.12-alpine
      ports:
      - name: http
        containersPort: 80
      lifecycle:
        portStart:
          exec:
            command: ["/bin/sh", "-c", "echo Healthy > /usr/share/nginx/html/healthz"]
      livenessProbe:
        httpGet:
          path: /healthz
          port: http
          scheme: HTTP

apiVersion: v1
kind: Pod
metadata:
  labels:
    test: liveness
  name: liveness-tcp
spec:
  containers:
    - name: liveness-tcp-demo
      image: nginx:1.12-alpine
      ports:
      - name: http
        containersPort: 80
      livenessProbe:
        tcpSocket:
          port: http

Always:    在任何情况下，只要容器不在运行状态，就需要重启容器
OnFailure: 只在容器，异常时才自动重启容器
Never: 从来不重启容器

selector:
  matchLabels:
    component: redis

{key: KEY_NAME, operator: OPERATOR, values: [VALUE1, VALUE2, ...]}

selector:
  matchExpressions:
    - {key: tier, operator: In, values: [cache]}
    - {key: environment, operator: Exists, values:}

apiVersion: v1
kind: Pod
...
spec:
 nodeSelector:
   disktype: ssd

apiVersion: v1
kind: Pod
metadata:
  name: pod-with-nodeselector
  labels:
    env: testing
spec: 
  containers:
  - name: myapp
    image: ikubernetes/myapp:v1
  nodeSelector:
    disktype: ssd

apiVersion: v1
kind: Pod
metadata:
  name: with-node-affinity
spec:
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: metadata.name
            operator: In
            values:
            - node-geektime

apiVersion: v1
kind: Pod
metadata:
  name: with-toleration
spec:
  tolerations:
  - key: node.kubernetes.io/unschedulable
    operator: Exists
    effect: NoSchedule

# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
kind: Service
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"name":"myapp","namespace":"default"},"spec":{"clusterIP":"10.99.99.99","ports":[{"nodePort":30080,"port":80,"targetPort":80}],"selector":{"app":"myapp","release":"canary"},"type":"NodePort"}}
  creationTimestamp: "2019-04-07T05:54:38Z"
  name: myapp
  namespace: default
  resourceVersion: "739917"
  selfLink: /api/v1/namespaces/default/services/myapp
  uid: a1636d2f-58f9-11e9-8178-560001fa0d25
spec:
  clusterIP: 10.99.99.99
  externalTrafficPolicy: Cluster
  ports:
  - nodePort: 30080
    port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: myapp
    release: canary
  sessionAffinity: None
  type: NodePort
status:
  loadBalancer: {}

spec:
 backoffLimit: 5
 activeDeadlineSeconds: 100

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
...
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
spec:
  serviceName: "nginx"
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.9.1
        ports:
        - containerPort: 80
          name: web
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes:
      - ReadWriteOnce
      resources:
        requests:
          storage: 1Gi

apiVersion: v1
kind: Pod
...
spec:
  hostAliases:
  - ip: "10.1.2.3"
    hostnames:
    - "foo.remote"
    - "bar.remote"
...

cat /etc/hosts
# Kubernetes-managed hosts file.
127.0.0.1 localhost
...
10.244.135.10 hostaliases-pod
10.1.2.3 foo.remote
10.1.2.3 bar.remote

apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  hostNetwork: true
  hostIPC: true
  hostPID: true
  containers:
  - name: nginx
    image: nginx
  - name: shell
    image: busybox
    stdin: true
    tty: true

apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  shareProcessNamespace: true
  containers:
  - name: nginx
    image: nginx
  - name: shell
    image: busybox
    stdin: true
    tty: true

apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod 
  labels:
    app: myapp
spec: 
  containers:
  - name: myapp-container
    image: ikubernetes/myapp:v1
  initContainers:
  - name: init-something
    image: busybox
    command: ['sh', '-c', 'sleep 10']

apiVersion: v1
kind: Pod
metadata:
  name: lifecycle-demo
spec: 
  containers:
  - name: lifecycle-demo-containers
    image: ikubernetes/myapp:v1
    lifecycle:
      postStart:
        exec:
          command: ["/bin/sh", "-c", "echo 'lifecycle hooks handler' > /usr/share/nginx/html/test.html"]