mayureshkrishna / openshift-templates

This repository contains several OpenShift templates like Generic Microservices template with image stream based deployment with deployment strategy on just config change, with service, routes with TLS termination at the edge and horizontal pod autoscaler 1 to 4

OpenShift Application Templates

1. Microservice Templates

The first set of templates are for MicroServices. These are generic templates with sizing and allows team/developers to build their own application and they should base it Alpine and Slim JDK verison:

FROM mayureshkrishna/java-8:server-jre-8u121-slim

(i) Microservice Small Template

This template makes following resources available on the containers:

1. ImageStream
2. DeploymentConfig a. Rolling Deployment Strategy b. Config Change as Trigger c. Container Resources limited to CPU: 500m to 1 Core and Memory: 100Mi to 500Mi and Port 8080
3. Service exposed on port 8080
4. Route with TLS edge termination
5. HorizontalPodAutoscaler with Min 1 and Max 4 pods with 80% CPU utilization as trigger

This template has 4 parameters:

1. APPLICATION_NAME - This is the name of application/microservice
2. ENV_NAME - This is the project name on OpenShift
3. APPLICATION_DOMAIN - This the sub-domain of your OpenShift deployment
4. REGISTRY_URL - This is OpenShift internal docker registry URL

Following command can be used to create the template in openshift:

oc create -f microservice-small-template.json -n dev

Your OpenShift admin can create this template at OpenShift level thus making it available across all projects.

Following command can be used to update/replace an existing template in openshit:

oc replace -f microservice-small-template.json -n dev

Following command can be used to export an existing template in openshit to a file:

oc export templates/microservice-small-template -o json > microservice-small-template.json -n dev

You can use yaml instead of json if you prefer yaml.

Following command can be used to create a new app using this template in openshit:

oc new-app --template=microservice-small-template -p APPLICATION_NAME=sample-app,ENV_NAME=dev,APPLICATION_DOMAIN=amnotion.com,REGISTRY_URL=172.30.36.202:5000 -l "app=sample-app"  -n dev