Kubernetes Architecture

Kubernetes Components

Master:

Components:

• API Server
• Cloud Controller (optional)
• Controller Manager
• Etcd
• Scheduler

Nodes:

Components:

• Kubelet
• Kube-proxy

This is where workloads are deployed and run.

Nodes have:

• Status
• Heartbeats
• Node Controller (on control plane)
• Eviction Limits (?)
• Node topology
• Graceful node shutdown

Kubelete and Kube-proxy are the components that interact with k8s API in control plane via HTTPS.

Other components of a Node:

• Cgroupv2: based on linux cgroups
• Container Runtime: docker, runc?

Labs

I will be using minikube in all of these study sessions:

➤ minikube start \
   --nodes=3 \
   --driver=virtualbox \
   --feature-gates=JobPodFailurePolicy=true,PodDisruptionConditions=true \
   --insecure-registry "registry.local:5000" \
   --container-runtime=docker