kubectl 使用

端口转发

查看帮助 "kubectl port-forward --help"

kubectl port-forward --help
Forward one or more local ports to a pod.

 Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted.

 If there are multiple pods matching the criteria, a pod will be selected automatically. The forwarding session ends
when the selected pod terminates, and a rerun of the command is needed to resume forwarding.

Examples:
  # Listen on ports 5000 and 6000 locally, forwarding data to/from ports 5000 and 6000 in the pod
  kubectl port-forward pod/mypod 5000 6000

  # Listen on ports 5000 and 6000 locally, forwarding data to/from ports 5000 and 6000 in a pod selected by the
deployment
  kubectl port-forward deployment/mydeployment 5000 6000

  # Listen on port 8443 locally, forwarding to the targetPort of the service's port named "https" in a pod selected by
the service
  kubectl port-forward service/myservice 8443:https

  # Listen on port 8888 locally, forwarding to 5000 in the pod
  kubectl port-forward pod/mypod 8888:5000

  # Listen on port 8888 on all addresses, forwarding to 5000 in the pod
  kubectl port-forward --address 0.0.0.0 pod/mypod 8888:5000

  # Listen on port 8888 on localhost and selected IP, forwarding to 5000 in the pod
  kubectl port-forward --address localhost,10.19.21.23 pod/mypod 8888:5000

  # Listen on a random port locally, forwarding to 5000 in the pod
  kubectl port-forward pod/mypod :5000

Options:
      --address=[localhost]: Addresses to listen on (comma separated). Only accepts IP addresses or localhost as a
value. When localhost is supplied, kubectl will try to bind on both 127.0.0.1 and ::1 and will fail if neither of these
addresses are available to bind.
      --pod-running-timeout=1m0s: The length of time (like 5s, 2m, or 3h, higher than zero) to wait until at least one
pod is running

Usage:
  kubectl port-forward TYPE/NAME [options] [LOCAL_PORT:]REMOTE_PORT [...[LOCAL_PORT_N:]REMOTE_PORT_N]

Use "kubectl options" for a list of global command-line options (applies to all commands).

# 使用
# TYPE 可选: pod/deployment/service/svc, 默认: pod
kubectl port-forward TYPE/NAME [options] [LOCAL_PORT:]REMOTE_PORT [...[LOCAL_PORT_N:]REMOTE_PORT_N]

# 举例
# 查看 myns 下的 deployment
kubectl get deployments -n=myns
NAME    READY   UP-TO-DATE   AVAILABLE   AGE
redis   3/3     3            3           39m

# 查看 myns 下的 service
kubectl get svc -n=myns
NAME        TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)    AGE
redis-svc   ClusterIP   10.98.249.0   <none>        6379/TCP   39m

# 查看 myns 下的 pod
kubectl get po -n=myns
NAME                     READY   STATUS    RESTARTS   AGE
redis-6bdd7f9b9c-fr8dv   1/1     Running   0          33m
redis-6bdd7f9b9c-jfmx7   1/1     Running   0          33m
redis-6bdd7f9b9c-v8nkz   1/1     Running   0          33m

# 将 [命名空间: myns, 名称: redis 的 deployment] 的 6379 端口映射到宿主机的 26379
kubectl port-forward -n myns deployment/redis 26379:6379

# 将 [命名空间: myns, 名称: redis-svc 的 service] 的 6379 端口映射到宿主机的 26379
kubectl port-forward -n myns service/redis-svc 26379:6379
# 或
kubectl port-forward -n myns svc/redis-svc 26379:6379

# 将 [命名空间: myns, 名称: redis-6bdd7f9b9c-fr8dv 的 pod] 的 6379 端口映射到宿主机的 26379
kubectl port-forward -n myns pod/redis-6bdd7f9b9c-fr8dv 26379:6379
# 或
kubectl port-forward -n myns redis-6bdd7f9b9c-fr8dv 26379:6379