A NodeJS application to use in OpenShift

openshift demo-scenarios nodejs openshift-demo

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Full CICD Setup

Automated setup through Templates

Create the four environments :

oc new-project demo-dev
oc new-project demo-build
oc new-project demo-test
oc new-project demo-prod

Deploy a Jenkins in the build project :

oc new-app -n demo-build --template=jenkins-persistent --name=jenkins -p MEMORY_LIMIT=1Gi

Create all other objects using the template :

oc process -f setup/all-in-one-template.yaml > objects.json
oc create -f objects.json

Then, configure Jenkins as described here.

Where parameters are :

Parameter Name	Required ?	Default Value	Description
DEV_PROJECT	No	demo-dev	TODO
BUILD_PROJECT	No	demo-build	TODO
TEST_PROJECT	No	demo-test	TODO
PROD_PROJECT	No	demo-prod	TODO

TODO

Manual Setup

Prepare OpenShift

Create the four environments :

oc new-project demo-dev
oc new-project demo-build
oc new-project demo-test
oc new-project demo-prod

Create the build config in the build environment :

oc new-build -n demo-build nodejs~https://github.com/nmasse-itix/OpenShift-Demo-NodeJS.git --strategy=source --name=openshift-demo-nodejs

You can test the build config with :

oc start-build -n demo-build openshift-demo-nodejs --env=NPM_PACKAGE_TO_INSTALL=openshift-demo-nodejs-nmasse@0.1.0

Deploy a Jenkins in the build project :

oc new-app -n demo-build --template=jenkins-persistent --name=jenkins -p MEMORY_LIMIT=1Gi

Give admin role to the jenkins service account on subsequent environments :

oc adm policy add-role-to-user admin system:serviceaccount:demo-build:jenkins -n demo-test
oc adm policy add-role-to-user admin system:serviceaccount:demo-build:jenkins -n demo-prod

Give rights on other environments to pull images from build environment :

oc adm policy add-role-to-group system:image-puller system:serviceaccounts:demo-test -n demo-build
oc adm policy add-role-to-group system:image-puller system:serviceaccounts:demo-prod -n demo-build

Tag the test image :

oc tag demo-build/openshift-demo-nodejs:latest openshift-demo-nodejs:ready-for-testing -n demo-test

Create the test application :

oc new-app demo-build/openshift-demo-nodejs:ready-for-testing --name openshift-demo-nodejs -n demo-test
oc expose service openshift-demo-nodejs --name=openshift-demo-nodejs --hostname=demo.test.app.openshift.test -n demo-test

Tag the prod image :

oc tag demo-test/openshift-demo-nodejs:ready-for-testing openshift-demo-nodejs:ready-for-prod -n demo-prod

Create the prod application (blue) :

oc new-app demo-build/openshift-demo-nodejs:ready-for-prod --name openshift-demo-nodejs-blue -n demo-prod -l color=blue

Create the prod application (green) :

oc new-app demo-build/openshift-demo-nodejs:ready-for-prod --name openshift-demo-nodejs-green -n demo-prod -l color=green

Create a service on selector "color" :

oc create -n demo-prod -f - <<EOF
apiVersion: v1
kind: Service
metadata:
  labels:
    app: openshift-demo-nodejs
  name: openshift-demo-nodejs
spec:
  ports:
  - name: 8080-tcp
    port: 8080
    protocol: TCP
    targetPort: 8080
  selector:
    color: blue
  sessionAffinity: None
  type: ClusterIP
EOF

And expose this service as a route :

oc expose service openshift-demo-nodejs --name=openshift-demo-nodejs --hostname=demo.prod.app.openshift.test -n demo-prod

You can verify the target of the route with :

oc get service openshift-demo-nodejs -n demo-prod -o template --template='{{ .spec.selector.color }}'

You can change the target of the route with :

oc patch -n demo-prod service/openshift-demo-nodejs --patch '{"spec":{"selector":{"color":"green"}}}'

Disable the triggers :

oc set triggers dc/openshift-demo-nodejs --from-image=demo-build/openshift-demo-nodejs:ready-for-testing --manual=true -c openshift-demo-nodejs -n demo-test
oc set triggers dc/openshift-demo-nodejs-blue --from-image=demo-build/openshift-demo-nodejs:ready-for-prod --manual=true -c openshift-demo-nodejs-blue -n demo-prod
oc set triggers dc/openshift-demo-nodejs-green --from-image=demo-build/openshift-demo-nodejs:ready-for-prod --manual=true -c openshift-demo-nodejs-green -n demo-prod

Create the Jenkins Pipeline

Configure Jenkins as described here.