Kubernetes Basics with Minikube and kubectl

Introduction

• Overview of basic kubectl commands for managing Kubernetes.
• Focus on creating and debugging pods in Minikube.

Initial Setup

• Minikube Cluster: Set up a Minikube cluster.
• kubectl Installation: Ensure kubectl is installed.

Basic Commands

• Check Node Status: kubectl get nodes
  • Shows nodes in the cluster (e.g., Master node in Minikube).
• Check Pods: kubectl get pods
  • Displays running pods. Initially, there may be none.
• Check Services: kubectl get services
  • Lists Kubernetes services; typically starts with a default service.

Creating Deployments

• Pod Creation
  • Pods aren't created directly; instead, use deployments.
  • Deployments manage pods and are more efficient.
• kubectl create deployment
  • Syntax: kubectl create deployment [name] --image=[image]
  • Example: Creating an Nginx deployment.
• Deployment Status
  • Check with kubectl get deployment and kubectl get pods.
  • Deployment creates a ReplicaSet which manages pods.

ReplicaSet and Pod Management

• Understanding ReplicaSet
  • Manages replicas of a pod.
  • Not directly managed by the user, instead managed through deployments.
• Scaling Pods
  • Use deployment configurations to change the number of replicas.
• Editing Deployments
  • Use kubectl edit deployment [name] to update configurations (e.g., image version).
  • Changes in deployments automatically cascade to pods and ReplicaSets.

Debugging and Logs

• Accessing Logs: kubectl logs [pod-name]
  • View logs from inside containers (helps in debugging).
• Detailed Pod Information: kubectl describe pod [pod-name]
  • Provides detailed state changes and debugging info.

Interactive Terminal Access

• kubectl exec -it [pod-name] -- [command]
  • Opens an interactive terminal session inside a container.
  • Useful for testing and debugging directly inside the pod.

Deleting Resources

• Deleting Deployments: kubectl delete deployment [name]
  • Removes the deployment and associated pods and ReplicaSets.

Configuration Files

• Using Configuration Files
  • Preferred method over command-line for managing Kubernetes resources.
  • Uses kubectl apply -f [file-name.yaml] to create/update resources.
• Example Configuration File
  • Specifies resource type, name, replicas, and pod blueprint.
• Updating Resources
  • Simply modify the configuration file and reapply it to update existing resources.
  • Kubernetes detects and updates only the changed aspects.

Conclusion

• Overview of essential kubectl commands.
• Demonstrated creating, editing, and deleting deployments.
• Discussed logging, debugging, and use of configuration files.
• Preview of future content focusing on YAML configuration syntax.

Additional Resources

• Look forward to more detailed tutorials on configuration files.
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