Which statement about ETCD is NOT accurate?

Which statement about ETCD is NOT accurate?

• A. It is the source of truth and backing store for all data
• B. It is a distributed key-value store used for cluster state
• C. It runs container runtime on each node
• D. It provides reliable data storage for cluster state

Answer: (C)

ETCD serves as the centralized, reliable backing store for all Kubernetes data. It acts as a distributed key-value store that holds the cluster state, configurations, and metadata, ensuring a single source of truth that the API server and other components rely on. It uses consensus (Raft) to stay consistent across a cluster of nodes, which is why it’s described as a reliable data storage for the cluster state. The container runtime, on the other hand, runs on each node (examples include containerd or CRI-O) and is managed by the kubelet; ETCD does not execute containers or manage the runtime. That’s why the statement about ETCD running the container runtime on every node is not accurate. The other descriptions correctly reflect ETCD’s role as the source of truth, a distributed key-value store for cluster state, and a reliable storage for that state.

ETCD serves as the centralized, reliable backing store for all Kubernetes data. It acts as a distributed key-value store that holds the cluster state, configurations, and metadata, ensuring a single source of truth that the API server and other components rely on. It uses consensus (Raft) to stay consistent across a cluster of nodes, which is why it’s described as a reliable data storage for the cluster state. The container runtime, on the other hand, runs on each node (examples include containerd or CRI-O) and is managed by the kubelet; ETCD does not execute containers or manage the runtime. That’s why the statement about ETCD running the container runtime on every node is not accurate. The other descriptions correctly reflect ETCD’s role as the source of truth, a distributed key-value store for cluster state, and a reliable storage for that state.