Red Hat OpenShift Administration I: Operating a Production Cluster

Instructions

1. Create a web application deployment named webconfig from the web console. Use the registry.ocp4.example.com:8443/rhscl/httpd-24-rhel7:latest container image.

   1. Log in to the OpenShift cluster as the developer user with the developer password by using the OpenShift web console https://console-openshift-console.apps.ocp4.example.com URL.

   2. Change to the Administrator perspective, and change to the storage-configs project. Select the Workloads → Deployments option and click the Create Deployments button. Add the webconfig deployment name and the image name, and leave the default for the other values.

   3. Select the Create button. Verify the successful deployment of three pods.

2. Expose the web application to external access from the web console. Use the following information to create a service and a route for the web application, and leave the hostname and path fields blank.

   Service field	Service value
   Service name	webconfig-svc
   App selector	webconfig
   Port number	8080
   Target port	8080

   Route field	Route value
   Route name	webconfig-rt
   Service name	webconfig-svc
   Target port	8080

   1. Select the Networking → Services option and click the Create Service button to create the webconfig-svc service that exposes the webconfig deployment. Verify the status of the service.

   2. Select the Networking → Routes option and click the Create Route button to create the webconfig-rt service that exposes the webconfig-svc service.

   3. Use a web browser to navigate to the http://webconfig-rt-storage-configs.apps.ocp4.example.com route. A testing page is displayed by default because of the missing files.

3. Use the missing files to create a configuration map from the web console.

   1. Select the Workloads → ConfigMaps option and click the Create ConfigMap button to create the webfiles configuration map by using the redhatlogo.png file and the index.html file in the /home/DO180/labs/storage-configs directory, and verify the creation of the configuration map. Add a Data key, define the index.html name as the Key value, and open the /home/DO180/labs/storage-configs/index.html file.

      Add a Binary Data key, define the redhatlogo.png name as the Key value, and open the /home/DO180/labs/storage-configs/redhatlogo.png file.

4. Log in to the OpenShift cluster from the command line, and mount the webfiles configuration map as a volume in the webconfig deployment from the command line.

   1. Log in to the OpenShift cluster as the developer user with the developer password.

      [student@workstation ~]$ oc login -u developer -p developer \
      https://api.ocp4.example.com:6443
      ..output omitted...

   2. Mount the webfiles configuration map as a volume.

      [student@workstation ~]$ oc set volume deployment/webconfig \
        --add --type configmap --configmap-name webfiles \
        --name webfiles-vol --mount-path /var/www/html/
      deployment.apps/webconfig volume updated

   3. Verify the deployment status. Verify that a new pod was created.

      [student@workstation ~]$ oc status
      ...output omitted...
      http://webconfig-rt-storage-configs.apps.ocp4.example.com to pod port 8080 (svc/webconfig-svc)
        deployment/webconfig deploys registry.ocp4.example.com:8443/redhattraining/httpd-noimage:v2
          deployment #2 running for 2 minutes - 1 pod
          deployment #1 deployed 17 minutes ago
      ...output omitted...

      [student@workstation ~]$ oc get pods
      NAME              	        READY  STATUS   ...
      webconfig-654bcf6cf-wcnnk  1/1    Running  ...
      ...output omitted...

   4. Return to the web browser, and navigate to the webconfig-rt-storage-configs.apps.ocp4.example.com route. Click the Click me! link to open the file.

      The configuration map successfully added the missing files to the web application.