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Kubectl

  • It is the primary CLI tool for interacting with kubernetes clusters.
  • It's essentially the bridge that connects the user to k8s, allowing the user to manage and control their cluster from the command line.

Kubectl commands​

Deploying and managing applications​

  • Kubectl let's us create, update and delete the k8s objects like pods, deployments, and services.
  • The below command can be used to deploy the application using yaml config.
kubectl apply -f my-app.yaml

Inspecting Resources​

  • Using kubectl we can view the state and configurations of various kubernetes resources, including pods, nodes, services, namespaces.
kubectl get pods

Debugging and troubleshooting​

  • Kubectl offers several commands for diagnosing issues in the cluster. You can check logs, view resource configurations, and even connect to running containers for deeper troubleshooting.
kubectl logs my-pod kubectl exec -it my-pod -- /bin/bash

Scaling and updating deployments​

  • Using kubectl we can scale applications up or down by adjusting the number of replicas and update configurations or images on the fly.
kubectl scale deployment my-app --replicas=5 
kubectl set image deployment/my-app my-app=nginx:1.18

Accessing cluster information​

  • Kubectl provides details about k8s cluster itself, including nodes, namespaces, and component health.
kubectl cluster-info