如何获取 kubernetes 服务的集群 IP

Question

I've created a service which wraps an nfs, and I need to get the cluster IP for it so that I can set it to persistent volumne using it.

I know I can use the following to get this:

$ kubectl get svc nfs-server
NAME                  TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)                      AGE
nfs-server   ClusterIP   10.59.243.58   <none>        2049/TCP,20048/TCP,111/TCP   2m

What I want to know is, how do I extract that cluster IP in a bash script? It's generated as part of a deployment process, so I can't just type it in to my persistent volume manifest.

Answer 1

You can parse the of kubectl get svc command something like below to get the inner details of the deployment.

export CLUSTER_IP=$(kubectl get services/nfs-server -o go-template='{{(index.spec.clusterIP)}}');echo CLUSTER_IP=$CLUSTER_IP

Alternatively, you can try any combination of shell hacks involving cut and awk . One such example is;

kubectl describe svc/nfs-server | grep IP: | awk '{print $2;}'

Answer 2

The previous answer using go-template output was failing. Using jsonpath worked for me:

#!/bin/bash

cluster_ip=$(kubectl get svc nfs-server -ojsonpath='{.spec.clusterIP}')
echo $cluster_ip