DO180 - ch07s06

This command ensures that all resources are available for this exercise. It also creates the updates-imagestreams project and the /home/student/DO180/labs/updates-imagestreams/resources.txt file. The resources.txt file contains the name of the images and some commands that you use during the exercise. You can use the file to copy and paste these image names and commands.

[student@workstation ~]$ lab start updates-imagestreams

Instructions

Log in to the OpenShift cluster as the developer user with the developer password. Use the updates-imagestreams project.

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

Set the updates-imagestreams project as the active project.

[student@workstation ~]$ oc project updates-imagestreams
...output omitted...

Create the versioned-hello image stream and the v1.0 image stream tag from the registry.ocp4.example.com:8443/redhattraining/versioned-hello:v1.0 image.

Use the oc create is command to create the image stream.

[student@workstation ~]$ oc create is versioned-hello
imagestream.image.openshift.io/versioned-hello created

Use the oc create istag command to create the image stream tag.

[student@workstation ~]$ oc create istag versioned-hello:v1.0 \
  --from-image registry.ocp4.example.com:8443/redhattraining/versioned-hello:v1.0
imagestreamtag.image.openshift.io/versioned-hello:v1.0 created

Enable image stream resolution for the versioned-hello image stream so that Kubernetes resources in the current project can use it.
1. Use the oc set image-lookup command to enable image lookup resolution.
```
[student@workstation ~]$ oc set image-lookup versioned-hello
imagestream.image.openshift.io/versioned-hello image lookup updated
```
2. Run the oc set image-lookup command without any arguments to verify your work.
```
[student@workstation ~]$ oc set image-lookup
NAME             LOCAL
versioned-hello  true
```

Review the image stream and confirm that the image stream tag refers to the source image by its SHA ID. Verify that the source image in the registry.ocp4.example.com:8443 registry has the same SHA ID.

Retrieve the details of the versioned-hello image stream.

Note

To improve readability, the instructions truncate the SHA-256 strings.

[student@workstation ~]$ oc describe is versioned-hello
Name:           versioned-hello
Namespace:      updates-imagestreams
Created:        7 minutes ago
...output omitted...

v1.0
  tagged from registry.ocp4.example.com:8443/redhattraining/versioned-hello:v1.0

  * registry.ocp4.example.com:8443/.../versioned-hello@sha256:66e0...105e
      7 minutes ago

Use the oc image info command to query the image from the classroom container registry. The SHA image ID is the same as the one from the image stream tag.

[student@workstation ~]$ oc image info \
  registry.ocp4.example.com:8443/redhattraining/versioned-hello:v1.0
Name:          registry.ocp4.example.com:8443/redhattraining/versioned-hello:v1.0
Digest:        sha256:66e0...105e
Media Type:    application/vnd.docker.distribution.manifest.v2+json
...output omitted...

Create a deployment named version that uses the versioned-hello:v1.0 image stream tag.
1. Use the oc create deployment command to create the object.
```
[student@workstation ~]$ oc create deployment version --image versioned-hello:v1.0
deployment.apps/version created
```
2. Wait for the pod to start. You might have to rerun the command several times for the pod to report a Running status. The name of the pod on your system probably differs.
```
[student@workstation ~]$ oc get pods
NAME                       READY   STATUS    RESTARTS   AGE
version-744bf7694b-bzhd2   1/1     Running   0          2m11s
```
Confirm that both the deployment and the pod refer to the image by its SHA ID.
1. Retrieve the image that the deployment uses. The deployment refers to the image from the source registry by its SHA ID. The v1.0 image stream tag also points to that SHA image ID.
```
[student@workstation ~]$ oc get deployment -o wide
... IMAGES ...
... registry.ocp4.example.com:8443/.../versioned-hello@sha256:66e0...105e ...
```
2. Retrieve the image that the pod is using. The pod is also referring to the image by its SHA ID.
```
[student@workstation ~]$ oc get pod version-744bf7694b-bzhd2 \
  -o jsonpath='{.spec.containers[0].image}{"\n"}'
registry.ocp4.example.com:8443/redhattraining/versioned-hello@sha256:66e0...105e
```

Finish

On the workstation machine, use the lab command to complete this exercise. This step is important to ensure that resources from previous exercises do not impact upcoming exercises.

[student@workstation ~]$ lab finish updates-imagestreams

Discuss Red Hat OpenShift Administration I: Operating a Production Cluster

Go to community

Version 4.12.2 versus 4.12 of DO180 course?

DRobitaille

21 lis 2023

I just noticed that there is now a version 4.12.2 of the DO180. Currently without any new updated videos. Do we have access to some sort of changelog to judge how different the new version is compared to 4.12. I'm currently in the process of reviewing the content of DO180/DO280 in preparation for my upcoming EX280 exam (based on "4.12"), so I'm wondering if it's worth studying the 4.12.2 version instead of 4.12.

470

Red Hat OpenShift Administration I: Containers & Kubernetes (DO180)

Haley_Ruccio

20 lip 2023

Deploy, manage, and troubleshoot containerized applications running as Kubernetes workloads in OpenShift clusters.Course DescriptionRed Hat OpenShift Administration I: Managing Containers and Kubernetes (DO180) prepares OpenShift cluster administrators to manage Kubernetes workloads and to collaborate with developers, DevOps engineers, system administrators, and SREs to ensure the availability of application workloads. This course focuses on managing typical end-user applications that are often accessible from a web or mobile UI and that represent most cloud-native and containerized workloads. Managing applications also includes deploying and updating their dependencies, such as databases, messaging, and authentication systems.The skills that you learn in this course apply to all versions of OpenShift, including Red Hat OpenShift on AWS (ROSA), Azure Red Hat OpenShift, and OpenShift Container Platform.This course is based on Red Hat OpenShift 4.12.Course Content SummaryManaging OpenShift clusters from the command-line interface and from the web console.Troubleshooting network connectivity between applications inside and outside an OpenShift cluster.Connecting Kubernetes workloads to storage for application data.Configuring Kubernetes workloads for high availability and reliability.Managing updates to container images, settings, and Kubernetes manifests of an application.Target AudienceSystem administrators and platform operators who are interested in managing OpenShift clusters and containerized applications.Site Reliability Engineers who are interested in maintaining and troubleshooting containerized applications on Kubernetes.System and software architects who are interested in learning and using the features and functions of an OpenShift cluster.Developers and Site Reliability Engineers that are new to container technology should enroll in Red Hat OpenShift Development I: Introduction to Containers with Podman (DO188).Recommended trainingTake our free assessment to gauge whether this offering is the best fit for your skills.Prerequisite: Containers, Kubernetes and Red Hat OpenShift Technical Overview or equivalent knowledge of Linux containers.Technology considerationsThis course requires internet access to access the cloud-based classroom environment that provides an OpenShift cluster and a remote administrator’s workstation.

Welcome to the Red Hat OpenShift Administration (DO180) group in the Red Hat Learning Community!

Deanna

18 lip 2023

We are excited to launch a space dedicated to the Red Hat Training course Red Hat OpenShift Administration I - Containers & Kubernetes! To gain the most value from this group - click the "Join Group" button in the upper right hand corner of the group home screen.We encourage group members to collaborate in this group to discuss topics, ask questions, share best practices and tips, provide course feedback, and share their accomplishments as it relates to DO180.Read more about Red Hat OpenShift Administration I here.

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Revision: do180-4.14-b6cd706