Openshift: Lab 4 – Install an application from a Linux container image using the oc CLI tool

What Lab 4 teaches

Lab 4 teaches how to use the oc CLI tool from a local machine to deploy an application on a remote OpenShift cluster from a Linux container image stored in a container image repository.

The sample image used is:

quay.io/rhdevelopers/greeter

The main deployment command in the PDF is:

oc new-app quay.io/rhdevelopers/greeter
Code language: JavaScript (javascript)

The expected output shows OpenShift creating:

imagestream.image.openshift.io "greeter" created
deployment.apps "greeter" created
service "greeter" created
Code language: CSS (css)

Then OpenShift says the application is not exposed and suggests:

oc expose service/greeter

Main lab flow

Clean CLI version of Lab 4

# Log in using the token command copied from OpenShift web console
oc login --token=<your-token> --server=<your-api-server>

# Confirm login
oc whoami

# Check current project
oc project

# Deploy the app from a container image
oc new-app quay.io/rhdevelopers/greeter

# Check created resources
oc get all

# Expose the service as a route
oc expose service/greeter

# Get the route
oc get route greeter

# Open/test the app
curl -I http://$(oc get route greeter -o jsonpath='{.spec.host}')

# View deployment labels
oc get deployment --show-labels

# Delete all app resources by label
oc delete all -l app=greeter
Code language: PHP (php)

So yes, this lab is basically the CLI version of Lab 3, but it uses a different sample image: quay.io/rhdevelopers/greeter instead of the Lab 3 ParksMap image.

Rajesh Kumar

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