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kubernetes

Resource Management 5 Monitoring 2 Debugging 1 Networking 1 Scaling 1 Deployment 1 Configuration 1 File Management 1

kubernetes Commands

Resource Management

kubectl get

Display one or many resources.

resources list display 

kubectl get
Examples:
List all pods 
kubectl get pods
List pods in specific namespace 
kubectl get pods -n default
List pods with wide output 
kubectl get pods -o wide
kubectl apply

Apply a configuration to a resource by filename or stdin.

deploy create update 

kubectl apply
Examples:
Apply from file 
kubectl apply -f deployment.yaml
Apply from directory 
kubectl apply -f ./k8s/
Dry run 
kubectl apply -f deployment.yaml --dry-run=client
kubectl create

Create a resource by filename or stdin.

create resource 

kubectl create
Examples:
Create deployment 
kubectl create deployment nginx --image=nginx
Create namespace 
kubectl create namespace my-namespace
kubectl delete

Delete resources by filenames, stdin, resources and names, or by resources and label selector.

delete remove 

kubectl delete
Examples:
Delete by file 
kubectl delete -f deployment.yaml
Delete pod by name 
kubectl delete pod my-pod
Delete all pods 
kubectl delete pods --all
kubectl describe

Show details of a specific resource or group of resources.

describe details information 

kubectl describe
Examples:
Describe pod 
kubectl describe pod my-pod
Describe service 
kubectl describe service my-service
Describe node 
kubectl describe node my-node

Monitoring

kubectl logs

Print the logs for a container in a pod.

logs output debugging 

kubectl logs
Examples:
View pod logs 
kubectl logs my-pod
Follow logs 
kubectl logs -f my-pod
Show last 100 lines 
kubectl logs --tail=100 my-pod
kubectl top

Show resource usage (CPU/memory/storage) for nodes or pods.

monitoring resources usage 

kubectl top
Examples:
Show node resource usage 
kubectl top nodes
Show pod resource usage 
kubectl top pods

Debugging

kubectl exec

Execute a command in a container.

execute debug container 

kubectl exec
Examples:
Execute command in pod 
kubectl exec my-pod -- ls /app
Open shell in pod 
kubectl exec -it my-pod -- /bin/bash

Networking

kubectl port-forward

Forward one or more local ports to a pod.

port-forward networking access 

kubectl port-forward
Examples:
Forward port 
kubectl port-forward my-pod 8080:80
Forward multiple ports 
kubectl port-forward my-pod 8080:80 8443:443

Scaling

kubectl scale

Set a new size for a deployment, replica set, or replication controller.

scale replicas size 

kubectl scale
Examples:
Scale deployment 
kubectl scale deployment my-deployment --replicas=3
Scale replica set 
kubectl scale replicaset my-replicaset --replicas=5

Deployment

kubectl rollout

Manage the rollout of a deployment.

rollout deployment update 

kubectl rollout
Examples:
Check rollout status 
kubectl rollout status deployment/my-deployment
Rollback deployment 
kubectl rollout undo deployment/my-deployment
Pause rollout 
kubectl rollout pause deployment/my-deployment

Configuration

kubectl config

Modify kubeconfig files.

config kubeconfig context 

kubectl config
Examples:
View current context 
kubectl config current-context
List contexts 
kubectl config get-contexts
Switch context 
kubectl config use-context my-context

File Management

kubectl cp

Copy files and directories to and from containers.

copy files transfer 

kubectl cp
Examples:
Copy file to pod 
kubectl cp local-file.txt my-pod:/app/
Copy file from pod 
kubectl cp my-pod:/app/log.txt ./local-log.txt