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Change the Service CIDR for the cluster.

 

Create a Pod named check-ip in Namespace default using image httpd:2.4.41-alpine. Expose it on port 80 as a ClusterIP Service named check-ip-service. Remember/output the IP of that Service.

Change the Service CIDR to 11.96.0.0/12 for the cluster.

Then create a second Service named check-ip-service2 pointing to the same Pod to check if your settings did take effect. Finally check if the IP of the first Service has changed.

 

Answer:

Let's create the Pod and expose it:

And check the Pod and Service ips:

Now we change the Service CIDR on the kube-apiserver:

Give it a bit for the kube-apiserver and controller-manager to restart

Wait for the api to be up again:

 

 

Now we do the same for the controller manager:

Give it a bit for the controller-manager to restart.

We can check if it was restarted using crictl:

 

 

Checking our existing Pod and Service again:

Nothing changed so far. Now we create another Service like before:

And check again:

There we go, the new Service got an ip of the new specified range assigned. We also see that both Services have our Pod as endpoint.

 

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