kubernetes commands.

 ============================================================

KUBERNETES / KUBECTL COMMAND CHEAT SHEET

AWS EKS + SPRING BOOT

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# ==========================================================

# 1. KUBECTL / CLUSTER

# ==========================================================

kubectl version --client

kubectl cluster-info

kubectl config current-context

kubectl config get-contexts

kubectl config use-context <context-name>

# ==========================================================

# 2. NODES

# ==========================================================

kubectl get nodes

kubectl get nodes -o wide

kubectl describe node <node-name>

# ==========================================================

# 3. NAMESPACES

# ==========================================================

kubectl get namespaces

kubectl get ns

kubectl get all -n <namespace>

kubectl get all -n staging

# ==========================================================

# 4. PODS

# ==========================================================

kubectl get pods -n staging

kubectl get pods -o wide -n staging

kubectl get pods -w -n staging

kubectl describe pod <pod-name> -n staging

# ==========================================================

# 5. APPLICATION LOGS

# ==========================================================

kubectl logs <pod-name> -n staging

kubectl logs -f <pod-name> -n staging

kubectl logs --tail=100 <pod-name> -n staging

kubectl logs --since=30m <pod-name> -n staging

kubectl logs <pod-name> -c <container-name> -n staging

# ==========================================================

# 6. DEPLOYMENTS

# ==========================================================

kubectl get deployments -n staging

kubectl get deploy -n staging

kubectl describe deployment <deployment-name> -n staging

kubectl rollout status deployment/<deployment-name> -n staging

kubectl rollout history deployment/<deployment-name> -n staging

# ==========================================================

# 7. SERVICES

# ==========================================================

kubectl get services -n staging

kubectl get svc -n staging

kubectl describe service <service-name> -n staging

# ==========================================================

# 8. CONFIGMAPS

# ==========================================================

kubectl get configmaps -n staging

kubectl describe configmap <configmap-name> -n staging

# ==========================================================

# 9. SECRETS

# ==========================================================

kubectl get secrets -n staging

kubectl describe secret <secret-name> -n staging

# WARNING: May expose sensitive credentials

kubectl get secret <secret-name> -o yaml -n staging

# ==========================================================

# 10. EVENTS / TROUBLESHOOTING

# ==========================================================

kubectl get events -n staging

kubectl get events -n staging --sort-by=.lastTimestamp

# ==========================================================

# 11. EXECUTE COMMAND INSIDE POD

# ==========================================================

kubectl exec -it <pod-name> -n staging -- /bin/sh

kubectl exec -it <pod-name> -n staging -- /bin/bash

# Exit container

exit

# ==========================================================

# 12. RESTART DEPLOYMENT

# ==========================================================

kubectl rollout restart deployment/<deployment-name> -n staging

kubectl rollout status deployment/<deployment-name> -n staging

# ==========================================================

# 13. DELETE POD

# ==========================================================

kubectl delete pod <pod-name> -n staging

# ==========================================================

# 14. GET ALL RESOURCES

# ==========================================================

kubectl get all -n staging

# ==========================================================

# 15. SCALING

# ==========================================================

kubectl get deployment <deployment-name> -n staging

kubectl scale deployment <deployment-name> --replicas=3 -n staging

kubectl get pods -n staging

# ==========================================================

# 16. ROLLBACK

# ==========================================================

kubectl rollout history deployment/<deployment-name> -n staging

kubectl rollout undo deployment/<deployment-name> -n staging

kubectl rollout status deployment/<deployment-name> -n staging

# ==========================================================

# 17. FILTER BY LABEL

# ==========================================================

kubectl get pods -l app=<app-name> -n staging

kubectl get pods -l app=impress -n staging

kubectl get all -l app=impress -n staging

# ==========================================================

# 18. RESOURCE USAGE

# ==========================================================

kubectl top pods -n staging

kubectl top nodes

# ==========================================================

# 19. MOST IMPORTANT DAILY COMMANDS

# ==========================================================

kubectl config current-context

kubectl get ns

kubectl get pods -n staging

kubectl get pods -o wide -n staging

kubectl describe pod <pod-name> -n staging

kubectl logs <pod-name> -n staging

kubectl logs -f <pod-name> -n staging

kubectl get deploy -n staging

kubectl get svc -n staging

kubectl get events -n staging --sort-by=.lastTimestamp

# ==========================================================

# 20. SPRING BOOT / EKS TROUBLESHOOTING FLOW

# ==========================================================

kubectl config current-context

kubectl get ns

kubectl get pods -n <namespace>

kubectl get pods -o wide -n <namespace>

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

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

kubectl logs -f <pod-name> -n <namespace>

kubectl get events -n <namespace> --sort-by=.lastTimestamp

# ==========================================================

# 21. AWS EKS CONNECTION

# ==========================================================

# Check AWS identity

aws sts get-caller-identity

# If using a specific AWS profile

aws sts get-caller-identity --profile <profile-name>

# List EKS clusters

aws eks list-clusters --region <aws-region>

# Configure kubectl for an EKS cluster

aws eks update-kubeconfig \

  --region <aws-region> \

  --name <cluster-name>

# Example

aws eks update-kubeconfig \

  --region us-east-1 \

  --name staging-eksCluster-a11b87c

# Verify connection

kubectl cluster-info

# Check nodes

kubectl get nodes

# ==========================================================

# 22. QUICK EKS WORKFLOW

# ==========================================================

aws sts get-caller-identity

aws eks list-clusters --region <aws-region>

aws eks update-kubeconfig \

  --region <aws-region> \

  --name <cluster-name>

kubectl config current-context

kubectl get nodes

kubectl get ns

kubectl get pods -n staging

kubectl get deploy -n staging

kubectl get svc -n staging

kubectl logs -f <pod-name> -n staging

# ==========================================================

# IMPORTANT CONCEPTS

# ==========================================================

kubectl    = Local Kubernetes command-line client

Cluster   = Complete Kubernetes environment

Node      = Machine/worker machine where Pods run

Pod       = Kubernetes workload unit containing container(s)

Container = Actual application runtime, e.g. Spring Boot

Namespace = Logical separation inside a Kubernetes cluster

Deployment = Manages Pods, replicas and rolling updates

Service   = Stable network endpoint for accessing Pods

ConfigMap = Non-sensitive application configuration

Secret    = Sensitive configuration/credentials

RBAC      = Kubernetes Role-Based Access Control

IAM       = AWS identity and permission system

# ==========================================================

# KUBERNETES STRUCTURE

# ==========================================================

AWS EKS Cluster

|

+-- Node 1

|    |

|    +-- Pod

|    |    |

|    |    +-- Container

|    |         |

|    |         +-- Spring Boot Application

|    |

|    +-- Pod

|

+-- Node 2

|    |

|    +-- Pod

|

+-- Namespaces

     |

     +-- staging

     +-- production

     +-- monitoring

# ==========================================================

# APPLICATION DEBUGGING FLOW

# ==========================================================

Cluster

   |

   v

Namespace

   |

   v

Deployment

   |

   v

Pod

   |

   v

Container

   |

   v

Application Logs

# ==========================================================

# COMMON POD ERRORS

# ==========================================================

ImagePullBackOff

CrashLoopBackOff

Pending

FailedScheduling

FailedMount

ContainerCreating

Error

# ==========================================================

# SAFETY

# ==========================================================

# Always check which cluster you are connected to

kubectl config current-context

# Always check namespace before making changes

kubectl get ns

# Be careful with production:

kubectl delete ...

kubectl scale ...

kubectl rollout restart ...

kubectl rollout undo ...

# Be careful with secrets:

kubectl get secret <secret-name> -o yaml -n staging