kubernetes 使用kubectl port-forward 訪問應用

概述或功能 
經過端口轉發映射本地端口到指定的應用端口

例子 
建立 Redis deployment and service 
建立redis deployment

kubectl create -f https://k8s.io/docs/tutorials/stateless-application/guestbook/redis-master-deployment.yaml
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建立redis server

kubectl create -f https://k8s.io/docs/tutorials/stateless-application/guestbook/redis-master-service.yaml
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校驗redis server暴露的端口是6379

kubectl get pods redis-master-xxxxx --template='{{(index (index .spec.containers 0).ports 0).containerPort}}{{"\n"}}'
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把本地的port 映射到pod的port

kubectl port-forward redis-master-765d459796-258hz 6379:6379 
或者
kubectl port-forward pods/redis-master-765d459796-258hz 6379:6379
或者
kubectl port-forward deployment/redis-master 6379:6379 
或者
kubectl port-forward rs/redis-master 6379:6379 
或者
kubectl port-forward svc/redis-master 6379:6379
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成功以後會如下相似輸出

I0710 14:43:38.274550    3655 portforward.go:225] Forwarding from 127.0.0.1:6379 -> 6379
I0710 14:43:38.274797    3655 portforward.go:225] Forwarding from [::1]:6379 -> 6379
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經過命令行訪問redis

redis-cli
127.0.0.1:6379>ping

END

參考： 
port-forward-access-application-cluster