Kubectl Commands

Kubectl Commands - Quick Reference for dealing with K8s cluster

Creating objects

Kubernetes manifests can be defined in YAML or JSON. The file extension .yaml, .yml, and .json can be used.

kubectl apply -f ./my-manifest.yaml                     # create resource(s)
kubectl apply -f ./my1.yaml -f ./my2.yaml            # create from multiple files
kubectl apply -f ./dir                                             # create resource(s) in all manifest files in dir
kubectl create deployment nginx --image=nginx              # start a single instance of nginx        

# create a Job which prints "Hello World"

kubectl create job hello --image=busybox:1.28 -- echo "Hello World"        

# create a CronJob that prints "Hello World" every minute

kubectl create cronjob hello --image=busybox:1.28 --schedule="*/1  " -- echo "Hello World"        

# get the documentation for pod manifests

kubectl explain pods        

Viewing and finding resources

# Get commands with basic output

kubectl get services                                     # List all services in the namespace
kubectl get pods -A                                    # List all pods in all namespaces
kubectl get pods -o wide                            # List all pods with more details
kubectl get deployment my-dep                # List a particular deployment
kubectl get pods                                         # List all pods in the namespace
kubectl get pod my-pod -o yaml               # Get a pod's YAML
kubectl get pods -n namespace                 # Get pods in specific namespace        

# Describe commands

kubectl describe nodes my-node
kubectl describe pods my-pod        

# List Services Sorted by Name

kubectl get services --sort-by=.metadata.name        

# List PersistentVolumes

kubectl get pv        

# Get all running pods in the all namespaces

kubectl get pods -A | egrep -i "Completed | Running"        

#Get Failed pods in all namespaces

kubectl get pods -A | egrep -iv "Completed | Running"        

Interacting with running Pods

kubectl logs my-pod                                        # dump pod logs (stdout)
kubectl logs -l name=myLabel                        # dump pod logs, with label 
kubectl logs -f my-pod                                    # stream pod logs (stdout)
kubectl logs -f my-pod -c my-container         # stream pod specified container logs        

Interacting with Deployments and Services

kubectl logs deploy/my-deployment                                # dump Pod logs for a Deployment
kubectl logs deploy/my-deployment -c my-container     # dump Pod logs for a Deployment (multi-container case)
kubectl exec -it <pod_name> -c <container_name> — /bin/bash   # login into container         

Please share with others and like if this this is helpful!

#kubernetes #K8s #kubectl #devops #SRE