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02-create-app-from-container-image.adoc

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Create an App from a Container image

Create an App from a Container image

In this lab you will learn how to create a new project on OpenShift and how to create an application from an existing docker image using Web UI.

Add a new project

Important
 Please replace Username with your username

  • login to web UI via {{CONSOLE_ADDRESS}}

  • Use the same username and password that assigned to you

  • Click Developer under Administrator to switch to Developer persona

  • Click onto Project on the top

  • Click Create Project

image

  • Enter web-terminal-Username as name of the project. The display name and description is optional.

image

Deploy an Image

  • Click +Add on the left menu

  • Click onto Container Image to deploy an image

image

  • Enter quay.io/openshiftlabs/workshop-terminal:2.4.0 in the Image Name box, noting that there’s no http://, enter exactly as shown here, without the quotes

  • Select the magnifying glass icon to the right of the box

  • Use the default Name for the deployment

image

  • Click onto Deployment Configuration link at the bottom of the page

  • Add OC_VERSION and 4.2 as Environment Variable in the Deployment Configuration section

image

  • Click Create

  • You will be on the Topology view

image

  • click onto the middle of the icon, the details page shows on the right

image

  • Click DC workshop-terminal

  • Click Events tab

Events in OpenShift Container Platform are modeled based on events that happen to API objects in an OpenShift Container Platform cluster. Events allow OpenShift Container Platform to record information about real-world events in a resource- agnostic manner. For more information, please see https://docs.openshift.com/container-platform/4.2/nodes/clusters/nodes-containers-events.html

Accessing to the Terminal

Next we need to learn how to get to the route of the image, so we can access this application from the outside of OpenShift (i.e. from the internet).

  • Navigate to Topology on the left

  • Click on the icon where is shown with the bubble

image

  • the terminal will be opened on a separated browser tab

Setting up OC CLI on the terminal

  • Execute the following in the terminal from the route link:

$ wget https://mirror.openshift.com/pub/openshift-v4/clients/ocp/{{VERSION}}/openshift-client-linux-{{VERSION}}.tar.gz
$ tar zvxf openshift-client-linux-{{VERSION}}.tar.gz
$ mv oc /opt/app-root/bin/
$ oc version
Note
 If normal cut/paste does not work, you can try to use browser’s edit menu for cut/paste.
image

To login to a remote server

$ oc login {{API_URL}}
Note
 Username and password will be provided by your instructor.

Congratulations!! You now know how to create a project, an application using an external docker image and navigate around. You also install OC CLI on the web terminal to access the cluster via CLI.