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 the application name, and the object is associated with the application by the "app=<app-name> label.

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

Image Streams

2. Deployment Configuration The deployment configuration name is set to the application name and the object is associated with the application by the "app=<app-name> label.

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