You create a Google Kubernetes Engine private cluster and want to use kubectl to get the status of the pods.
In one of your instances you notice the master is not responding, even though the cluster is up and running.
What should you do to solve the problem?
Click on the arrows to vote for the correct answer
A. B. C. D.C.
In a Google Kubernetes Engine (GKE) private cluster, the control plane (including the master node) is not exposed to the public internet, and is accessible only through the private network of the GKE cluster. Therefore, if you are unable to reach the master from one of your instances, there are a few steps you can take to diagnose and solve the problem.
Firstly, you should check the status of the nodes and pods in the cluster. You can use the kubectl get nodes and kubectl get pods --all-namespaces commands to get an overview of the current state of the cluster.
If you find that the cluster is up and running, but the master is not responding, then you should check if the instance from which you are trying to access the master is correctly configured. Specifically, you should check if the instance has the appropriate network configuration to allow it to communicate with the master.
The correct answer to this question is option D, which is to create the appropriate master authorized network entries to allow the instance to communicate to the master. Master authorized network entries are a way to restrict access to the Kubernetes master to a specific set of IP addresses. By default, the master is accessible only from within the GKE cluster's private network, but you can configure additional IP addresses or CIDR blocks to access the master from other networks.
To create a master authorized network entry, you can use the gcloud container clusters update command with the --master-authorized-networks flag. For example, the following command creates a master authorized network entry that allows traffic from the IP address 10.0.0.0/24:
sqlgcloud container clusters update my-private-cluster --master-authorized-networks=10.0.0.0/24 Once you have created the appropriate master authorized network entry, you should be able to access the master from the instance. If you still encounter problems, you may want to check if there are any firewall rules that are blocking the traffic between the instance and the master, and adjust them accordingly.