Openshift: Lab 5 – Install an application from a source code using the oc CLI tool

Lab 5 summary

This lab teaches how to use the oc CLI from your local machine to deploy an application into OpenShift Developer Sandbox from source code stored in GitHub. OpenShift uses oc new-app to detect the source, select/create the builder workflow, build a container image, create the app resources, and then you expose it with a Route.

Sample application used

https://github.com/openshift/ruby-hello-world.git#beta4
Code language: JavaScript (javascript)

Main command from the lab:

oc new-app https://github.com/openshift/ruby-hello-world.git#beta4
Code language: JavaScript (javascript)

The expected created resources include:

imagestream.image.openshift.io "ruby-22-centos7" created
imagestream.image.openshift.io "ruby-hello-world" created
buildconfig.build.openshift.io "ruby-hello-world" created
deployment.apps "ruby-hello-world" created
service "ruby-hello-world" created
Code language: CSS (css)

The lab then tells you to expose the service:

oc expose service/ruby-hello-world

Expected output:

route.route.openshift.io/ruby-hello-world exposed

Main flow

Clean CLI version of Lab 5

# 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 app from GitHub source code
oc new-app https://github.com/openshift/ruby-hello-world.git#beta4

# Watch the build logs
oc logs -f buildconfig/ruby-hello-world

# Check created resources
oc get all

# Expose the service as a route
oc expose service/ruby-hello-world

# Get route
oc get route ruby-hello-world

# Test the route
curl -I http://$(oc get route ruby-hello-world -o jsonpath='{.spec.host}')

# Delete application resources
oc delete all -l app=ruby-hello-world
Code language: PHP (php)

Important correction

The PDF text says the selector option is -1, but that is a typo. The actual oc selector flag is lowercase -l, meaning “label selector.”

Correct:

oc delete all -l app=ruby-hello-world
Code language: JavaScript (javascript)

Incorrect:

oc delete all -1 app=ruby-hello-world
Code language: JavaScript (javascript)

The command shown in the PDF is correct, but the explanatory sentence has the typo.

Difference from earlier labs

So yes: Lab 5 is basically the CLI version of Lab 2, while Lab 4 was the CLI version of Lab 3.

Rajesh Kumar

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