Practical OpenShift for Developers - OpenShift 4

Install Docker Desktop on Windows 10 Home by downloading the installer and granting admin privileges. Update the WSL 2 kernel, restart, and test docker run hello-world before OpenShift installation lesson.

Install Docker Desktop on Windows 10 Pro using Hyper-V, not WSL 2, then run a HelloWorld test and proceed to the OpenShift installation introductory lesson.

Learn how to set up your OpenShift environment with CodeReady Containers or the Developer Sandbox, compare requirements, and choose the right option for your OS.

Set up a hosted OpenShift environment with Red Hat's developer sandbox, create and verify a Red Hat account, and access the OpenShift console, choosing Windows or Mac OS setup paths.

download the oc tool for macOS and create an oc-command directory. move oc there, update your path in your startup file, and log in with the token and url.

Build a container image from a dockerfile and source files using docker build, learn how each instruction creates a new layer from a base image, verify with docker images.

Run the hello-world api server with docker run, verify running containers with docker ps, and stop the container using ctrl-c or docker kill by container id.

Learn how to expose a container port and forward traffic from the host to the pod using Docker -p, with practical examples like 8080:8080 and verifying with curl localhost:8080.

Set default environment variables in the Dockerfile with the ENV instruction, and learn how to override them before running your container to customize the Hello World app’s HTTP responses.

Master how the run command in a Dockerfile starts a command in the latest intermediate container and saves a new layer, supporting OpenShift permissions and installing dependencies.

Discover how to navigate OpenShift 4 as a developer by managing users, organizing applications into projects, authenticating via the command line, and applying quotas to guarantee resource availability.

Log in to OpenShift with oc login, use the -u flow for developer on code-ready containers, then verify the user with oc whoami and log out with oc logout.

Explore using oc explain to reveal pod and spec field details, dive into the containers list and image field, and learn why pods are updated by deletion and recreation.

Learn to run a pod on OpenShift by executing oc create -f pods/pod.yaml. Then verify the pod status with oc get pods, ensuring it shows running.

Open a shell inside the running pod with oc rsh, then verify the Hello World server on localhost:8080 using wget. Use the in-container shell for debugging and testing the server.

Use the oc delete command with the pod resource type on the OpenShift REST API to stop a pod. Delete hello-world-pod and verify with oc get pod no resources found.

Explore YAML basics, syntax, objects and lists, and why YAML is the defacto standard for storing Kubernetes and OpenShift resource definitions, with comparisons to JSON.

Deployment configs define the pod template and manage deploying new images or configuration changes, with replicas controlling pod counts and automating deployments and lifecycle hooks in OpenShift.

Clean up OpenShift resources one by one by deleting DeploymentConfigs, services, and ImageStreamTag with oc delete, then verify with oc status and oc get.

Explore deployment configs, rollout, and rollback in OpenShift using oc commands, learning how to roll out new versions with zero downtime and revert to previous versions when needed.

Expose pods with a single service to provide internal OpenShift network access. Learn how a service uses a proxy, a selector, a virtual IP, and ports to route traffic.

Learn to create a service for a pod with oc expose, expose port 8080, verify with oc status, and validate internal pod communication using a second pod and wget.

Store ConfigMaps in OpenShift to hold configuration data separate from pods, enabling environment-specific values and centralized configuration across multiple pods.

Learn to create a configmap from all files in a directory with oc create configmap --from-file, using the pods directory and then run oc get -o yaml to verify.

Explore image streams and image stream tags in OpenShift to manage container images and automatically deploy the latest versions via oc commands and deployment configurations.

Import an image stream with oc import image to create streams from a remote quay.io image, then reuse the stream with oc new app to deploy.