VCP-VMC 2024 Question 103
Single answerA VMware Cloud Administrator is troubleshooting an issue where newly deployed Pods in a Kubernetes cluster are unable to communicate with each other. Upon inspection, the networking layer seems to be functioning correctly, but the Pods are not being assigned IP addresses. Which Kubernetes component is most likely causing this issue?
- A
Kubelet
- B
Kube-proxy
- C
etcd
- D
CNI plugin
Show answer and explanation
Correct answer: D
Explanation
The CNI plugin is a critical Kubernetes component responsible for managing network configuration for Pods, including assigning IP addresses and setting up the network namespace. If Pods are not receiving IP addresses, the problem is most likely with the CNI plugin, as other components such as Kubelet, Kube-proxy, and etcd are not directly responsible for Pod-level networking.
- A. Incorrect.
Kubelet is responsible for managing the lifecycle of containers on a node and ensuring that Pods are running. However, it does not handle Pod networking or IP assignment.
- B. Incorrect.
Kube-proxy manages networking rules to enable service discovery and communication within the cluster. While it is key to networking, it does not assign IP addresses to Pods.
- C. Incorrect.
etcd is a distributed key-value store used to store cluster state and configuration data. It does not handle Pod-level networking or IP assignment issues.
- D. Correct.
The CNI (Container Network Interface) plugin is responsible for configuring networking for Pods, including assigning IP addresses. If Pods are not being assigned IPs, an issue with the CNI plugin is the most likely cause.