Kubernetes Kubelet Architecture — Explained Simply

 Kubernetes Kubelet Architecture — Explained Simply 🧠

This diagram shows what actually happens inside a Kubernetes Node.

Flow:

1️⃣ API Server

   → Sends PodSpec (desired state)

2️⃣ Kubelet Main Loop

   → Continuously reconciles desired vs actual state

3️⃣ Pod Workers (Parallel)

   → Handle pod lifecycle independently

4️⃣ CRI Layer

   → Kubelet → CRI → Container Runtime (containerd / CRI-O)

5️⃣ Image Manager

   → Pulls & garbage-collects images

6️⃣ Volume Manager

   → Mounts / Unmounts volumes

7️⃣ PLEG

   → Detects container state changes

8️⃣ Status Manager

   → Sends Pod status back to API Server

     (IP, Phase, Conditions)

Core Concept:

Kubelet is a reconciliation engine.

It constantly ensures:

Desired State = Actual State

That’s how Kubernetes achieves self-healing.