s2i build . centos/nodejs-6-centos7 color-backend --copy
We need 2 sets of resources (DC, SVC, Route) to be able to perform Blue/Green deployment
First we deploy blue
oc process -f template.app.yaml COLOR=blue | oc apply -f -
Next green
oc process -f template.app.yaml COLOR=green | oc apply -f -
These will also deploy a master route which will allow us switch between deployments
Last what we need to deploy is our pipeline (+actual image build config and image stream)
oc process -f template.pipeline.yaml | oc apply -f -
Go to Builds > Pipelines in your OpenShift console and hit Start Pipeline
Once the build and tagging is done, you should see an URL to your new blue or green deployment. The API endpoint is $URL/api/v1/color
Clicking on Proceed will promote the build to the master route