Kubernetes - Certified Kubernetes Administrator (CKA)

Create a Kubernetes cluster with kubeadm using one master and two workers, installing Docker and Kubernetes components, then deploy Calico networking to join nodes.

Learn how to add another worker node to a Kubernetes cluster by generating a fresh join token and running the join command on the new machine.

Set up and manage the Kubernetes admin.conf kubeconfig to access your cluster, including locating, copying, regenerating the config with kubeadm init, and configuring local kubectl access.

Install cops and AWS CLI, configure an S3 bucket with versioning for state storage, create a cops cluster on AWS, and validate using kubectl.

Add a new worker node by editing the instance group and applying a rolling update, then delete the cluster by removing all resources and the associated cloud components.

Install rancher kubernetes engine (rke) across three machines—the master and two workers—by downloading the binary, setting permissions, installing docker, configuring with arc, and running arc up to bring the cluster.

Learn how ports represent a running process inside a Kubernetes cluster, and how a pod contains one or more containers that share resources, networking, and storage.

Explore namespaces as subclusters that isolate applications, and show storage class usage with Longhorn for persistent volume claims, plus how annotations add extra information to deployments and other resources.

Create a pod with kubectl run nginx, list pods with kubectl get pods, explore resources with kubectl api resources, and describe pods to learn node and container details.

Learn how to label pods, use labels for service routing, and manage label changes with kubectl by adding, overwriting, and removing labels on a pod.

Expose a Kubernetes app with cluster IP, node port, and load balancer. Learn to edit service definitions, configure selectors, and access the app via node IP:port or load balancer IP.

Learn the difference between replication controller and replica set in Kubernetes, including how replica set uses match expressions to manage three replicas based on pod labels.

Explains how replica sets maintain three pod replicas and automatically recreate deleted pods, and discusses upgrading or downgrading the application image.

Delete the replica set to prevent pods from being recreated, run kubectl delete replica set <name>, then verify all pods are terminating and removed.