K8s-commands-usage

Kube commands:

# get pods
kubectl get po  

# Watch for pod changes
kubectl get po -w
Ex: kubectl get po | grep chat

# Delete pod
kubectl delete po <pod name>
Ex: kubectl delete po vault-56455b8cf-2d8f6

# Describe a pod
kubectl describe <pod name>
kubectl describe zookeeper-1-327620013

# get service
kubectl get svc
Ex: kubectl get svc | grep chat

# get replica set
 kubectl get rs

# scale up replicas
kubectl scale deploy <servicename> --replicas=<replica count>
ex: kubectl scale deploy push-notification --replicas=1

#Describe Service
 kubectl describe svc <Service name>
Ex:  kubectl describe svc chat

# Describe deployment
 kubectl describe deploy <service name> 
Ex: kubectl describe deploy chat

# Edit Deployment
kubectl edit deploy <service name> 
Ex: kubectl edit deploy chat

# Delete deployment
kubectl delete deploy <service name> 
Ex: kubectl delete deploy chat

#Delete just the deployment not the replica set ..etc
 kubectl delete deploy <deploy name> --cascade=false
Ex:  kubectl delete deploy vault --cascade=false

# Exec into container in multicontainer pod
kubectl exec -it <pod> bash -c <container name>
kubectl exec -it jenkins-build-oscscan-3097bd8ddacb98 bash -c ossc-automation

# get logs for container in multicontainer pod
kubectl logs <pod> -c <conatainer name>
kubectl logs jenkins-build-oscscan-3096cb69c4af5b -c ossc-automation

#Apply the new deployment yaml’s
kubectl apply -f <deployment yaml>

# Get Nodes
kubectl get no 

#Show labels on Nodes
kubectl get no --show-labels | grep storage-generic

#Describe a Node
kubectl describe no ip-10-60-8-80.ec2.internal

kubectl top nodes
kubectl describe nodes

#Nodes Resource usage:
kubectl get nodes --no-headers | awk '{print $1}' | xargs -I {} sh -c 'echo {}; kubectl describe node {} | grep Allocated -A 5 | grep -ve Event -ve Allocated -ve percent -ve -- ; echo'

# Scale the replicas for service
kubectl scale deployment <Service name> --replicas=0
Ex: kubectl scale deployment operator-deployment --replicas=0

kubectl get node -l type=storage-kafka

#Port forwding for pod
kubectl port-forward deployments/kuard 8080:8080
localhost:8080

kubectl get api-resources  —namespaced=true/false
kubectl proxy —> Creates a proxy to apiserver and can run curl commands directly
Kubectl config view —> to view the kubeconfig
kubectl explain pod 

kubectl config view | grep namespace:
# Set namespace for current context
kubectl config set-context --current --namespace=

kubectl rollout status deployment.apps/yourAppName -n yourNamespace
kubectl logs podName -n yourNamespace
kubectl get events --sort-by=metadata.creationTimestamp

#Examining CPU and memory from within container:
kubectl exec -it requests-pod top

#Finding a pod with highest CPU load
k top pod -A | sort -nrk3 | head -1 | awk '{print $2}'

k top pod -A  —sort-by=cpu —no-headers | head -1 | awk ‘{print $1}’

#How to configure Kubectl cluster locally
https://coreos.com/kubernetes/docs/latest/configure-kubectl.html

#Kube ImagePull secrets
https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/
kubectl create secret docker-registry regsecret --docker-server=<your-registry-server> --docker-username=<your-name> --docker-password=<your-pword> --docker-email=<your-email>