Three. K8s basic operations

development service pod relations

kubectl commonly used commands

kubectl cluster-info # View cluster information

kubectl describe pod -n kube-system kube-flannel-ds-amd64-trpqq # pod See the description of

kubectl get pods -n kube-system # View the specified namespace pod

kubectl create deployment NAME --image = image [--dry-run] [options] # Create a deployment, dry-run for the true test is not performed

kubectl expose deployment nginx-deploy --name=nginx --port=80 --target-port=80 --protocol=TCP

# Create a service for the deployment, --name name for the service, --port port is exposed, --target-port target pod port

Are dig -t A nginx.default.svc.cluster.local @ 10.96.0.10 # verification service can parse correctly, @ back to k8s ip address of the dns

kubectl describe svc nginx # description of service

kubectl get pods --show-labels # View pod label

kubectl scale deployment nginx-deploy --replicas = 3 # capacity expansion or contraction, --replicas the number

wget -O - -q nginx-deploy

kubectl rollout undo deployment myapp-deploy --to-revision = 1 # roll back to the version specified, the default rollback to the previous version

kubectl explain pod

Inventory Configuration

apiVersion: v1
kind: Pod
metadata:
  name: pod-demo
  namespace: default
  labels:
    app: myapp
    tier: frontend
spec:
  containers:
  - name: myapp
    image: ikubernetes/myapp:v1
  - name: busybox
    image: busybox
    command:
    - "/bin/sh"
    - "-c"
    - "sleep 5"

kubectl create -f test.yaml

kubectl delete -f test.yaml

kubectl describe pod pod-demo

kubectl exec -it pod-demo -c myapp -- /bin/sh

https://blog.csdn.net/ucsheep/article/details/81781509