Summary - What is Kubernetes

Combine cluster components to write an architecture description.

Summary: what Kubernetes is

In this group:

Kubernetes runs, scales and heals containers on a cluster according to the desired state.
Objects are defined declaratively in YAML and applied with kubectl apply.
Control plane: kube-apiserver, etcd, kube-scheduler, kube-controller-manager.
Worker node: kubelet, container runtime (containerd), kube-proxy.
kubectl get nodes/pods -o wide, describe, top and cluster-info are the basic commands for inspecting a cluster.

kubectl get nodes
kubectl get pods -A -o wide
kubectl top nodes

Write three commands: list the nodes; list the pods in all namespaces in wide format; scale the web deployment to 2 replicas.

Show example solution

kubectl get nodes
kubectl get pods -A -o wide
kubectl scale deployment web --replicas=2