sample node app

Sample node app for trying various openshift deployment strategies.

S2I

oc new-app --name nodeapp https://github.com/gunjangarge/sample-node-app --context-dir source

Dockerfile

oc new-app --name nodeapp https://github.com/gunjangarge/sample-node-app

Docker image

oc new-app --name nodeapp quay.io/gunjangarge/sample-node-app:v1

Deployment strategies

$ oc new-project blue-green-deploy
$ oc new-app --name appv1 quay.io/gunjangarge/sample-node-app -e COLOR=skyblue
$ oc expose svc/appv1 --name=app-route

Wait till pod is in "Running" state

$ curl $(oc get route app-route -o jsonpath='{.spec.host}')/deploy

Deploy new version,

$ oc new-app --name appv2 quay.io/gunjangarge/sample-node-app -e COLOR=darkcyan

For A/B deployment,

$ oc set route-backends app-route appv1=50 appv2=50

For Blue-Green deployment,

$ oc patch route app-route -p '{"spec":{"to":{"name":"appv2"}}}'

Check result,

$ while true; do curl $(oc get route app-route -o jsonpath='{.spec.host}')/deploy; sleep 3; done

You can also check route on browser to verify application is serving requests.