How to use kubectl port-forward in kubernetes
Editor to share with you how to use kubectl port-forward in kubernetes, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!
One: brief introduction
Kubectl port-forward uses port forwarding to map local ports to designated application ports to access applications in the cluster (Pod).
Two: give an example
1. Create a Pod to run the Redis server
a. Create a Pod:
Kubectl create-f https://k8s.io/docs/tasks/access-application-cluster/redis-master.yaml
After the command runs successfully, the following output verifies that the Pod has been created:
Pod "redis-master" created
b. Check to see if Pod is running and ready:
Kubectl get pods
When Pod is ready, the output shows the status of Running:
NAME READY STATUS RESTARTS AGE
Redis-master 2/2 Running 0 41s
c. Verify that the Redis server is running in Pod and listen on port 6379:
Kubectl get pods redis-master-- template=' {{(index (index .spec.containers 0) .containerPort 0) .containerPort} {{"\ n"}}'
Port output: 6379
two。 Forward the local port to the port in Pod
a. Forward port 6379 on the local workstation to port 6379 on redis-master pod:
Kubectl port-forward redis-master 6379:6379
The output looks like this:
I0710 14 4314 portforward.go:225 38.274550 3655 portforward.go:225] Forwarding from 127.0.0.1 purl 6379-> 6379
I0710 1414 43 portforward.go:225 38.274797 3655 portforward.go:225] Forwarding from [: 1]: 6379-> 6379
b. Launch the Redis command line interface
Redis-cli
c. At the Redis command line prompt, enter the ping command:
127.0.0.1 purl 6379 > ping
The Ping request returned PONG successfully.
Three: summary
Create a connection to forward the local port 6379 to port 6379 of the Redis server running in Pod. With this connection, you can debug the database running in Pod on your local workstation.
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