Update deployments in kubernetes

update_deployments.sh

# How to do updates to your environment
# more details to deployments and scaling:
# https://kubernetes.io/docs/concepts/workloads/controllers/deployment/

# 1. update the deployment.yml file and run
kubectl apply -f <deployment.yml>

# 2. update an image:
kubectl set image <deployment/nginx-deployment> <nginx>=<nginx:1.9.1>


########
# monitor deployments

# Check the rollout status
kubectl rollout status <deployment/nginx-deployment>
kubectl rollout status deployments <nginx-deployment>
# Check replicas
kubectl get rs
# check pods
kubectl get pods
# describe deployment
kubectl describe deployment


########
# Roll-Back

# check rollout history
kubectl rollout history <deployment/nginx-deployment>
kubectl rollout history <deployment/nginx-deployment> --revision=2

# roll back to previous revision
kubectl rollout undo <deployment/nginx-deployment>
# or choose a specific revision
kubectl rollout undo <deployment/nginx-deployment> --to-revision=2