Lecture Notes: Basic kubectl Commands and Managing Pods in Minikube

Introduction

• Objective: Learn basic kubectl commands for creating and debugging pods in Minikube.
• Tools: Minikube cluster, kubectl for managing Kubernetes clusters.

Initial Setup

• Cluster Status: kubectl get
  • Check node status: one master node in Minikube.
  • Check pods and services: initially no resources or default service.

Creating and Managing Deployments

• Pods in Kubernetes
  • Pod is the smallest unit but usually managed via deployments.
• Creating Deployments
  • Use kubectl create deployment with options for name and image.
  • Example: kubectl create deployment nginx-deployment --image=nginx
  • Deployment creates pods with specified container images.

Understanding Kubernetes Layers

• Deployment
  • Manages the blueprint for pods.
  • Configurations include name and container image.
• ReplicaSet
  • Automatically managed, controls pod replicas.
  • No direct management needed; handle via deployments.

Editing Deployments

• Editing with kubectl edit deployment
  • Modify deployment configurations like image version.
  • Changes automatically update pods and replicaset.

Debugging and Logs

• Checking Logs with kubectl logs
  • View application logs inside pods.
  • Useful for debugging.
• Exec into Pod with kubectl exec -it
  • Access terminal of a running container for debugging.

Deleting Resources

• Deleting Deployments
  • kubectl delete deployment <name> removes deployment and associated pods and replicaset.

Using Configuration Files

• Why Use Config Files?
  • Practicality: Easier than long command lines.
  • Centralizes configurations for deployments and other resources.
• Applying Config Files with kubectl apply -f <file>
  • Create or update resources from a YAML configuration file.
  • Example YAML includes deployment name, replicas, and pod template.

Summary

• Key kubectl commands: create, edit, delete, get status, logs, exec.
• Use configuration files for managing extensive setup and configuration.
• Upcoming content: Detailed breakdown of configuration file syntax.

Conclusion

• Stay tuned for more videos on Kubernetes configurations.
• Engage with any questions or feedback in comments section.

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