Grep for info on an image

kubectl describe deployments.apps deployment_name | grep -I image

Create a deployment named "httpd-frontend" using the httpd:2.4-alpine image

kubectl create deployment httpd-frontend --image=httpd:2.4-alpine

Create a deployment named blue with the nginx image and 3 replicas

kubectl create deployment blue --image=nginx --replicas=3

Edit a depoyment

kubectl edit deployment blue

Scale the number of replicas to 3 in the httpd-frontend deployment

kubectl scale deployment --replica=3 httpd-frontend

Create pod from command line

kubectl run redis --image=redis

kubectl run redis --image=redis --dry-run=client -o yaml pod.yaml (creates a pod yaml file, doesn't build it)

kubectl apply -f pod.yaml (This command will create pod)

Get replicaset

kubectl get replicaset

Deescribe replicaset

kubectl describe rs/new-replica-set

Scale a replica set

kubectl scale --replicas=5 rs/new-replica-set

Changing namespace context

kubectl config set-context $(kubectl config current-context) --namespace=finance

kubectl config set-context --current --namespace=twistlock 

Specify namespace to list pods

kubectl get pods --namespace-default

Get pods in all namespaces

kubectl get pods --all=namespaces

List namespaces

kubectl get ns

List namespaces (no headers)

kubctl get ns --no-headers 

Specify namespace to get pods

kubectl -n namespace  get pods

Create a Service

kubectl create -f service-definition.yml

Get Service info

kubectl get services or svc

Describe Services

kubectl describe service or svc servicename

Deployments

kubectl get deployments

Find image name in a deployment

kubectl descripe deplyments.apps deployment_name | grep -i image

Create a new service (command)

Kubectl expose deployment simple-webapp-deployment --name=webapp-service --target-port=8080 --type=NodePort --port=8080 --dry-run=client -o yaml > svc.yaml

Create a new service (file)

kubectl apply -f svc.yaml

List the kube-system pods

kubectl get pods --namespace kube-system

Get pods for the kube-system namespace

kubectl -n kube-system get pods

Show prod label in all environments

kubectl get all --selector env=prod

Count number pods in dev environment

kubectl get pods -l env=dev --no-headers | wc -l

Get all items with prod label

kubectl get all -l env=prod --no-headers | wc -l

List multiple labels on a pod

kubectl get pods -l env=prod,bu=finance,tier=frontend

Create yaml file for pod named bee

kubectl run bee --image=nginx --restart=Never --dry-run -o yaml > bee.yaml`

Show labels

kubectl get nodes node01 --show-labels

Apply label

kubectl label nodes node01 color=blue

Create Deployment

kubectl create deployment blue --image=nginx

Create Deployment - Dry Run \ yaml

kubectl create deployment red --image=nginx --dry-run -o yaml > red.yaml

Scale Deployment

kubectl scale deployment blue --replicas=6

Produce yaml from an existing deployment

kubectl get deployments.apps blue -o yaml > blue.yaml

Create yaml file from a pod

kubectl get pods elephant -o yaml > pod.yaml

Set Affinity - Edit a Deployment

kubectl get deployment.apps blue -o yaml > blue.yaml

Add Affinity Config - (Under template > spec)

affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: color
            operator: In
            values:
            - blue          

Delete previous deployment and create new with the yaml file

kubectl apply -f blue.yaml

Daemonsets

kubectl get ds --all-namespaces

Create yaml file, then edit and changed items to create a Daemonset

kubectl create deployment elasticsearch --image=k8s.gcr.io/fluentd-elasticsearch:1.20 --dry-run=client -o yaml > elastic.yaml

Get logs from a pod

kubectl logs webapp-1

View containers on pod to view logging

kubectl logs webapp-2 -c

Stream events on a pod (One container)

kubectl logs -f event-simulator-pod

Stream events on a pod (Specific container)

kubectl logs -f event-simulator-pod event-simulator

Rolling Updats and Rollbacks Create

kubectl create -f deployment-definition.yml

Get

kubectl get deployments

Update

kubectl apply -f deployment-definition.yml

kubectl set image deployment/myapp-deployment nginx=nginx:1.9.1

Status

kubectl rollout status deployment/myapp-deployment

kubectl rollout history deployment/myapp-deployment

Rollback

kubectl rollout undo deployment/myapp-deployment

Edit Deployment

kubectl edit deployments.app frontend

Create Config Map

kubectl create cm webapp-config-map --from-literal=APP_COLOR=darkblue

Explain yaml for pods (Available for other services as well

kubectl explain pods

Get static pod info

cat /var/lib/kubelet/config.yaml