OpenShift Tutorial – Basic Learning Workflow

How to login?

oc login https://api.XXXXXXXXXXXXXX.centralindia.aroapp.io:6443 --username=kubeadmin --password=EgzIY-DJPw2-3NXke-HNYmJ

oc login --token=sha256~LLnTlPcjcNjWsQRqnSyTn99LSvxwQdm47gaiEdZJa20 --server=https://api.XXXXXXXXXXXXXX.centralindia.aroapp.io:6443

curl -H "Authorization: Bearer sha256~LLnTlPcjcNjWsQRqnSyTn99LSvxwQdm47gaiEdZJa20" "https://api.XXXXXXXXXXXXXX.centralindia.aroapp.io:6443/apis/user.openshift.io/v1/users/~Code language: JavaScript (javascript)

Login to the Web Console and CLI on CRC

crc console --credentials
eval $(crc oc-env)
oc login -u kubeadmin -p <password> --insecure-skip-tls-verify
Code language: JavaScript (javascript)

Copy the admin URL and kubeadmin credentials → open in browser.

✅ Step 2: Understand Projects (Namespaces)

🔹 List All Projects:

oc get projects
Code language: JavaScript (javascript)

🔹 Create Your Own:

oc new-project demo-app
Code language: JavaScript (javascript)

✅ Step 3: Deploy Your First Application

oc get images
oc new-app --name=my-java-app registry.access.redhat.com/ubi8/openjdk-8-runtime@sha256:00cf28cf9a6c427962f922855a6cc32692c760764ce2ce7411cf605dd510367f
oc expose svc/my-java-app


oc get imagestreams -n openshift
oc new-app --name=my-httpd --image-stream=openshift/httpd
oc expose svc/my-httpd
oc get route my-httpdCode language: JavaScript (javascript)

Test in browser using the exposed route.

✅ Step 4: Work with the Developer Console

1. Go to the Web Console → Developer View
2. Switch to demo-app project
3. Click +Add → Use “Container Image”
4. Search for image like node:latest, php:8.2-apache, or quay.io/...

This gives visual understanding of how apps, builds, and deployments connect.

✅ Step 5: Build from Source (Git to Deployment)

🔹 Deploy from Git (Node.js example):

oc new-app https://github.com/sclorg/nodejs-ex.git
Code language: JavaScript (javascript)

🔹 Monitor:

oc get builds
oc logs -f bc/nodejs-ex
Code language: JavaScript (javascript)

🔹 Access:

oc expose svc/nodejs-ex
oc get route
Code language: JavaScript (javascript)

✅ Step 6: Scale Applications

🔹 Increase Pods:

oc scale --replicas=3 deployment/nginx

🔹 Check Pods:

oc get pods -o wide
Code language: JavaScript (javascript)

✅ Step 7: Access Pod Shell & Logs

oc rsh <pod-name>
oc logs <pod-name>
Code language: HTML, XML (xml)

Use this for debugging and viewing container state.

✅ Step 8: Set Resource Limits

oc set resources deployment nginx 
  --limits=cpu=500m,memory=256Mi 
  --requests=cpu=200m,memory=128Mi
Code language: JavaScript (javascript)

✅ Step 9: Understand and Apply YAML

1. Export a deployment: oc get deployment nginx -o yaml > nginx.yaml
2. Edit and apply: oc apply -f nginx.yaml

✅ Step 10: Use Secrets and ConfigMaps

🔹 Create ConfigMap:

oc create configmap app-config --from-literal=ENV=prod
Code language: JavaScript (javascript)

🔹 Create Secret:

oc create secret generic app-secret --from-literal=DB_PASS=admin123
Code language: JavaScript (javascript)

🔹 Mount or Inject via ENV in deployment YAML.

✅ Step 11: OpenShift Pipelines (Tekton)

1. In OperatorHub, install OpenShift Pipelines Operator
2. Create:
   • PipelineResource
   • Task
   • Pipeline
3. Use the developer console’s Pipelines view to build CI/CD

✅ Step 12: Monitor with Web UI

• Use Observe → Metrics
• View Dashboard, Topology, and Builds
• Use Pod terminal from console

✅ Step 13: Delete a Project

oc delete project demo-app
Code language: JavaScript (javascript)

📚 Bonus Tips:

🧪 Practice Ideas:

• Deploy a multi-container app with mysql + wordpress
• Create blue-green deployments
• Use Tekton pipeline to auto-deploy from GitHub

Rajesh Kumar

I’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I have worked at Cotocus. I share tech blog at DevOps School, travel stories at Holiday Landmark, stock market tips at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow , and SEO strategies at Wizbrand.

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