Deployments, Rolling Update, Rollback

k8UpdateRollback.sh

#!/bin/bash
#Deployments, Rolling Update, Rollback

#Nginx deployment yaml
echo “apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: nginx-deployment
  namespace: default
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80” >> nginx-deployment.yaml

kubectl create -f nginx-deployment.yaml

#status of all deployments in default namespace
kubectl get deployments

#Detailed description of deployment
kubectl describe deployment nginx-deployment

#Generate yaml file based off deployment
kubectl get deployment nginx-deployment -o yaml

#Update nginx set image of deployment
kubectl set image deployment/nginx-deployment nginx=nginx:1.8

#Rollout deployment after the previous update
kubectl rollout status deployment/nginx-deployment

#Detailed description of deployment update
kubectl describe deployment nginx-deployment

#Change set image in nginx deployment yaml
sed -i 's/image: nginx:1.7.9/image: nginx:1.9.1/g' /home/user/nginx-deployment.yaml

#Apply changes to nginx deployment yaml
kubectl apply -f nginx-deployment.yaml

#Rollout deployment after the previous update
kubectl rollout status deployment/nginx-deployment

#Detailed description of deployment update
kubectl describe deployment nginx-deployment

#Show history of 3rd revision rollout of nginx deployment
kubectl rollout history deployment/nginx-deployment --revision=3

#Rollback deployment to 2nd revision
kubectl rollout undo deployment/nginx-deployment --to-revision=2

#Detailed description of deployment update
kubectl describe deployment nginx-deployment