linuxexpert-practice-labs/labs/linux-plus/4-1-4-kubernetes-swarm-compose

Linux+ 4.1.4: Kubernetes, Swarm and Compose

A two-service stack with Compose on Podman, and a pod turned into Kubernetes YAML and played back, all rootless.

Before you start

The VM needs internet access. The lab installs Podman and creates user alice (password Lab-Pass-1), with lingering turned on so her user services run. Install podman-compose yourself (from EPEL on RHEL relatives). Do the container work as alice: log in as her, or use sudo -iu alice and then export XDG_RUNTIME_DIR=/run/user/$(id -u). Docker Hub limits anonymous pulls; if you hit the limit, use mirror.gcr.io/library/... instead of docker.io/library/....

Tasks

1. In ~/stack, write a compose.yaml with two services: web (nginx:1.30, host port 8080 to port 80) and cache (redis:8). Bring it up with podman-compose, check it with ps, curl and the logs, and leave it running. (The chapter then runs podman-compose down; skip that here.)
2. Create a pod lab that publishes host port 8081 to port 80, and run nginx:1.30 in it. Generate Kubernetes YAML for it as ~/stack/lab.yaml, remove the pod, and start it again from the YAML with podman kube play. Leave it running.

Hints

• dnf install podman-compose (EPEL), apt install podman-compose; podman-compose up -d, podman-compose ps, podman-compose logs web, curl -sI http://127.0.0.1:8080.
• podman pod create --name lab -p 8081:80, podman run -d --pod lab, podman kube generate lab > lab.yaml, podman pod rm -f lab, podman kube play lab.yaml, podman pod ps.