• Too many kubectl commands too long to remember?

    • View resource abbreviations
    Kubectl the describe the enterCopy the code
    • Configure the kubectl autocomplete command
    source <(kubectl completion bash)
Copy the code

  • Kubectl write yaml too tired, find sample too troublesome?

    • Run the run command
    kubectl run --image=nginx my-deploy -o yaml --dry-run > my-deploy.yaml
Copy the code
    • Export using the get command
    kubectl get statefulset/foo -o=yaml --export > new.yaml
Copy the code
    • The spelling of the field below Pod affinity is forgotten
    kubectl explain pod.spec.affinity.podAffinity
Copy the code

  • Monitoring Cluster Components

    • Cluster Status
    kubectl cluster-info 
Copy the code
    • More Cluster Information
    kubectl cluster-info dump
Copy the code
    • Component metrics
    curl localhost:10250/stats/summary
Copy the code
    • Component monitoring status
    curl localhost:10250/healthz
Copy the code

  • Manage K8s component logs

    #Component log
/var/log/kube-apiserver.log
/var/log/kube-proxy.log
/var/log/kube-controller-manager.log
/var/log/kubelet.log
Copy the code
    • Use systemd for management
     journalctl -u kubelet 
Copy the code
    • Deploy using the K8s plug-in
     kubectl logs -f kube-proxy
Copy the code

  • Manage K8s application logs

    • Intercepted from container standard output
     kubectl logs -f {pod name} -c {container name}
 docker logs -f {docker name}
Copy the code
    • Log files are mounted to the host directory
     apiVersion: v1
 kind: Pod
 metadata:
   name: test-pod
 spec:
   containers:
   - image: test-webserver
     name: test-container
     volumeMounts:
     - mountPath: /log
       name: log-volume
   volumes:
   - name: log-volume
     hostPath:
       path: /var/k8s/log
Copy the code

  • Deployment Upgrade and rollback

    • Create a Deployment
    kubectl run {deployment} --image={image} --replicas={rep.}
Copy the code
    • Upgrade Deployment
    Kubectl set image deployment/nginx-deployment nginx=nignx:1.9.1 kubectl set resources deployment/nginx-deployment -c=nginx --limits=cpu=200m,memory=512MiCopy the code
    • Upgrade strategy
    minReadySeconds: 5
strategy:
  type: RollingUpdata
    maxSurge: 1 # default 25%
    maxUnavailable: 1 # default 25%
Copy the code
    • Suspension of Deployment
    kubectl rollout pause deployment/nginx-deployment
Copy the code
    • Restore the Deployment
    kubectl rollout resume deployment/nginx-deployment
Copy the code
    • Querying the Upgrade Status
    kubectl rollout status deployment/nginx-deployment
Copy the code
    • Querying Upgrade History
    kubectl rollout history deploy/nginx-deployment
kubectl rollout history deploy/nginx-deployment --revision=2
Copy the code
    • The rollback
    kubectl rollout undo deployment/nginx-deployment --to-revision=2
Copy the code
    • Applied elastic expansion
    kubectl scale deployment nginx-deployment --replicas=10
Copy the code
    • Heapster interconnects with HPA
    kubectl autoscale deployment nginx-deployment --min=10 --max=15 --cpu-percent=80
Copy the code