{"id":49104,"date":"2025-04-14T14:56:15","date_gmt":"2025-04-14T14:56:15","guid":{"rendered":"https:\/\/www.devopsschool.com\/blog\/?p=49104"},"modified":"2026-02-21T07:27:56","modified_gmt":"2026-02-21T07:27:56","slug":"openshift-local-crc-basic-learning-workflow","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/openshift-local-crc-basic-learning-workflow\/","title":{"rendered":"OpenShift Tutorial \u2013 Basic Learning Workflow"},"content":{"rendered":"\n

How to login?<\/h2>\n\n\n\n
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oc login https:\/\/api.XXXXXXXXXXXXXX.centralindia.aroapp.io:6443 --username=kubeadmin --password=EgzIY-DJPw2-3NXke-HNYmJ<\/span>\n\noc login --token=sha256~LLnTlPcjcNjWsQRqnSyTn99LSvxwQdm47gaiEdZJa20 --server=https:\/\/api.XXXXXXXXXXXXXX.centralindia.aroapp.io:6443<\/span>\n\ncurl -H \"Authorization: Bearer sha256~LLnTlPcjcNjWsQRqnSyTn99LSvxwQdm47gaiEdZJa20\"<\/span> \"https:\/\/api.XXXXXXXXXXXXXX.centralindia.aroapp.io:6443\/apis\/user.openshift.io\/v1\/users\/~<\/span><\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
\"\"<\/figure>\n\n\n\n
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Login to the Web Console and CLI<\/strong> on CRC<\/h2>\n\n\n
crc console<\/span> --credentials\neval<\/span> $(crc oc-env)\noc login -u kubeadmin -p <password> --insecure-skip-tls-verify\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
Copy the admin URL and kubeadmin<\/code> credentials \u2192 open in browser.<\/p>\n\n\n
<\/code><\/span><\/pre>\n\n\n
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\u2705 Step 2: Understand Projects (Namespaces)<\/strong><\/h2>\n\n\n\n
\ud83d\udd39 List All Projects:<\/h3>\n\n\n
oc get<\/span> projects\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
\ud83d\udd39 Create Your Own:<\/h3>\n\n\n
oc new<\/span>-project demo-app\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
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\u2705 Step 3: Deploy Your First Application<\/strong><\/h2>\n\n\n
oc get<\/span> images\noc new-app --name=my-java-app registry.access.redhat.com\/ubi8\/openjdk-8-runtime@sha256:00cf28cf9a6c427962f922855a6cc32692c760764ce2ce7411cf605dd510367f\noc expose svc\/my-java-app\n\n\noc get<\/span> imagestreams -n openshift\noc new-app --name=my-httpd --image-stream=openshift\/httpd\noc expose svc\/my-httpd\noc get<\/span> route my-httpd<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
Test in browser using the exposed route.<\/p>\n\n\n\n
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\u2705 Step 4: Work with the Developer Console<\/strong><\/h2>\n\n\n\n
    \n
  1. Go to the Web Console \u2192 Developer View<\/strong><\/li>\n\n\n\n
  2. Switch to demo-app<\/code> project<\/li>\n\n\n\n
  3. Click +Add<\/strong> \u2192 Use \u201cContainer Image\u201d<\/li>\n\n\n\n
  4. Search for image like node:latest<\/code>, php:8.2-apache<\/code>, or quay.io\/...<\/code><\/li>\n<\/ol>\n\n\n\n
    This gives visual understanding of how apps, builds, and deployments connect.<\/p>\n\n\n\n
    \n\n\n\n
    \u2705 Step 5: Build from Source (Git to Deployment)<\/strong><\/h2>\n\n\n\n
    \ud83d\udd39 Deploy from Git (Node.js example):<\/h3>\n\n\n
    oc new<\/span>-app https:\/\/github.com\/sclorg\/nodejs-ex.git<\/span>\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
    \ud83d\udd39 Monitor:<\/h3>\n\n\n
    oc get<\/span> builds\noc logs -f bc\/nodejs-ex\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
    \ud83d\udd39 Access:<\/h3>\n\n\n
    oc expose svc\/nodejs-ex\noc get<\/span> route\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
    \n\n\n\n
    \u2705 Step 6: Scale Applications<\/strong><\/h2>\n\n\n\n
    \ud83d\udd39 Increase Pods:<\/h3>\n\n\n
    oc scale --replicas=3 deployment\/nginx\n<\/code><\/span><\/pre>\n\n\n
    \ud83d\udd39 Check Pods:<\/h3>\n\n\n
    oc get<\/span> pods -o wide\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
    \n\n\n\n
    \u2705 Step 7: Access Pod Shell & Logs<\/strong><\/h2>\n\n\n
    oc rsh <pod-name<\/span>><\/span>\noc logs <pod-name<\/span>><\/span>\n<\/code><\/span>Code language:<\/span> HTML, XML<\/span> (<\/span>xml<\/span>)<\/span><\/small><\/pre>\n\n\n
    Use this for debugging and viewing container state.<\/p>\n\n\n\n
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    \u2705 Step 8: Set Resource Limits<\/strong><\/h2>\n\n\n
    oc set<\/span> resources deployment nginx \n  --limits=cpu=500m,memory=256Mi \n  --requests=cpu=200m,memory=128Mi\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
    \n\n\n\n
    \u2705 Step 9: Understand and Apply YAML<\/strong><\/h2>\n\n\n\n
      \n
    1. Export a deployment: oc get deployment nginx -o yaml > nginx.yaml<\/code><\/li>\n\n\n\n
    2. Edit and apply: oc apply -f nginx.yaml<\/code><\/li>\n<\/ol>\n\n\n\n
      \n\n\n\n
      \u2705 Step 10: Use Secrets and ConfigMaps<\/strong><\/h2>\n\n\n\n
      \ud83d\udd39 Create ConfigMap:<\/h3>\n\n\n
      oc create configmap app-config --from<\/span>-literal=ENV=prod\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
      \ud83d\udd39 Create Secret:<\/h3>\n\n\n
      oc create secret generic app-secret --from<\/span>-literal=DB_PASS=admin123\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
      \ud83d\udd39 Mount or Inject via ENV in deployment YAML.<\/h3>\n\n\n\n
      \n\n\n\n
      \u2705 Step 11: OpenShift Pipelines (Tekton)<\/strong><\/h2>\n\n\n\n
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      1. In OperatorHub, install OpenShift Pipelines Operator<\/strong><\/li>\n\n\n\n
      2. Create:\n
          \n
        • PipelineResource<\/li>\n\n\n\n
        • Task<\/li>\n\n\n\n
        • Pipeline<\/li>\n<\/ul>\n<\/li>\n\n\n\n
        • Use the developer console\u2019s Pipelines view<\/strong> to build CI\/CD<\/li>\n<\/ol>\n\n\n\n
          \n\n\n\n
          \u2705 Step 12: Monitor with Web UI<\/strong><\/h2>\n\n\n\n
            \n
          • Use Observe \u2192 Metrics<\/strong><\/li>\n\n\n\n
          • View Dashboard<\/strong>, Topology<\/strong>, and Builds<\/strong><\/li>\n\n\n\n
          • Use Pod terminal<\/strong> from console<\/li>\n<\/ul>\n\n\n\n
            \n\n\n\n
            \u2705 Step 13: Delete a Project<\/strong><\/h2>\n\n\n
            oc delete<\/span> project demo-app\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
            \n\n\n\n
            \ud83d\udcda Bonus Tips:<\/h3>\n\n\n\n
            Feature<\/th>CLI Command<\/th><\/tr><\/thead>
            List all Pods<\/td>oc get pods<\/code><\/td><\/tr>
            View events<\/td>oc get events<\/code><\/td><\/tr>
            Port Forward<\/td>oc port-forward svc\/nginx 8080:80<\/code><\/td><\/tr>
            RoleBinding<\/td>oc adm policy add-role-to-user admin developer<\/code><\/td><\/tr>
            Enable Dev View<\/td>Use toggle in OpenShift console UI<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
            \n\n\n\n
            \ud83e\uddea Practice Ideas:<\/h2>\n\n\n\n
              \n
            • Deploy a multi-container app with mysql<\/code> + wordpress<\/code><\/li>\n\n\n\n
            • Create blue-green deployments<\/li>\n\n\n\n
            • Use Tekton pipeline to auto-deploy from GitHub<\/li>\n<\/ul>\n\n\n\n
              \n\n\n\n