OpenShift Create an Application from a Docker Image

Internal

• oc new-app
• Application Operations

Overview

A Docker image repository URL can be provided to oc new-app to create an application based on that image.

oc new-app <docker-repository-URL>

Example:

oc new-app docker.io/sonatype/nexus3:latest

Primitives

The utility creates an image stream, a deployment configuration and a service in the current project, and associate all of them with a single application by annotating them with the "app=<application-name>" label, where the application name is inferred from - and equal to - the name of the image repository given as argument.

1. Image Stream. The image stream name is set to be the same as the application name.

apiVersion: v1
kind: ImageStream
metadata:
 labels:
   app: nexus3
 name: nexus3
spec:
 lookupPolicy:
   local: false
 tags:
   from:
     kind: DockerImage
     name: docker.io/sonatype/nexus3:latest
   name: latest
   referencePolicy:
     type: Source

Image Streams

2. Deployment Configuration

3. Service

For more details on how to deploy a production-ready Nexus instance starting with oc new-app <nexus-image-url>, go to:

Deploy Nexus Based on a Standard Sonatype Docker Image