recreate

Recreate deployment

Version A is terminated then version B is rolled out.

The recreate strategy is a dummy deployment which consists of shutting down version A then deploying version B after version A is turned off. This technique implies downtime of the service that depends on both shutdown and boot duration of the application.

Steps to follow

1. version 1 is service traffic
2. delete version 1
3. deploy version 2
4. wait until all replicas are ready

In practice

# Deploy the first application
$ kubectl apply -f app-v1.yaml

# Test if the deployment was successful
$ curl $(minikube service my-app --url)
2018-01-28T00:22:04+01:00 - Host: host-1, Version: v1.0.0

# To see the deployment in action, open a new terminal and run the following
# command
$ watch kubectl get po

# Then deploy version 2 of the application
$ kubectl apply -f app-v2.yaml

# Test the second deployment progress
$ service=$(minikube service my-app --url)
$ while sleep 0.1; do curl "$service"; done

Cleanup

$ kubectl delete all -l app=my-app