my-docs/Containerization & Orchestration/Kubernetes/workloads/2-Pod.md

🌐 Kubernetes Pod Management Guide

A concise guide for managing Kubernetes Pods using kubectl and YAML manifests.

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📋 Listing Pods

🔹 Default Namespace

List all Pods in the default namespace:

kubectl get pods

🔹 Wide Output (More Info)

List Pods with extended details (e.g., IP, node, etc.):

kubectl get pods -o wide

🔹 Specific Namespace

List Pods in a specific namespace:

kubectl get pods -o wide -n <namespace-name>

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🚀 Running a Pod

Note: kubectl run is ideal for quick tests or running single Pods. For production workloads, use YAML manifests or Deployments.

🔹 Run a Pod in Default Namespace

kubectl run <pod-name> --image=<image-name>

🔹 Run a Pod in a Specific Namespace

kubectl run <pod-name> --image=<image-name> -n <namespace>

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❌ Deleting Pods

🔹 Standard Delete

kubectl delete pod <pod-name> -n <namespace-name>

🔹 Force Delete

kubectl delete pod <pod-name> -n <namespace-name> --force

🔹 Immediate Force Delete (No Grace Period)

kubectl delete pod <pod-name> -n <namespace-name> --force --grace-period=0

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✏️ Editing a Pod

Warning: Pods are not directly editable. Attempting to edit a running pod will result in a temporary patch but not persistent changes.

kubectl edit pod -n <namespace> <pod-name>

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🔧 Executing into a Pod

Use this to start a shell or run commands inside a container:

kubectl exec -it -n <namespace> <pod-name> -- <command>

Example for a shell:

kubectl exec -it -n dev my-pod -- /bin/bash

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🧾 Example Pod YAML Manifest

A multi-container Pod with resource limits and node selector:

apiVersion: v1
kind: Pod
metadata:
  namespace: dev
  name: pod-1
  labels:
    label1: test
    label2: test2
    app.kubernetes.io/label3: test3
    app.kubernetes.io/label4: test4
spec:
  containers:
    - name: nginx-server
      image: nginx

    - name: nginx-exporter
      image: nginx-exporter

    - name: ubuntu-c0
      image: ubuntu
      command: ["/bin/bash", "-c", "while true; do echo hello-world; sleep 5; done"]
      resources:
        limits:
          memory: "256Mi"
          cpu: "250m"
        requests:
          memory: "128Mi"
          cpu: "125m"
  nodeSelector:
    hostname: k3s
    app.kubernetes.io/disk: ssd