k8s学习

 kubectl exec -it ds-test-m9mrh bash

进入到某个pod里面 
kubectl exec -it ds-test-m9mrh bash

job.yaml

 kubectl create -f .job.yaml

apiVersion: batch/v1
kind: Job
metadata:
  name: pi
spec:
  template:
    spec:
      containers:
        - name: pi
          image: harbor.dcos.guangzhou.unicom.local/topia-zoo/perl:latest
          command: ["perl","-Mbignum=bpi","-wle","print bpi(2000)"]
      restartPolicy: Never
  backoffLimit: 4

kubectl logs pi-6fqxq

cronjob.yaml

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: hello
spec:
  schedule: "*/1 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
            - name: hello
              image: harbor.dcos.guangzhou.unicom.local/common/busybox:test
              args:
                - /bin/sh
                - -c
                - date; echo Hello from the Kubernates cluster
          restartPolicy: OnFailure

 secret.yaml

apiVersion: v1
kind: Secret
metadata:
  name: mysecret
type: Opaque
data:
  username: YWRtaW4=
  password: MTIzNDU2

 以变量形式挂载到容器中

apiVersion: v1
kind: Pod
metadata:
  name: mypod
spec:
  containers:
    - name: nginx
      image: harbor.dcos.guangzhou.unicom.local/common/nginx:latest
      env:
        - name: SECRET_USERNAME
          valueFrom:
            secretKeyRef:
              name: mysecret
              key: username
        - name: SECRET_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysecret
              key: password

 3.创建角色 rbac-role.yaml

kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: roledemo
  name: pod-reader
rules:
   - apiGroups: [""]  # "" indicate the core API group
     resources: ["pods"]
     verbs: ["get","watch","list"]