Containers and Podman Flashcards

What is a Pod in the context of Podman?

Answer: A group of containers sharing network and IPC namespaces

A Podman Pod is a group of containers that share a network namespace, IPC namespace, and optionally other namespaces, similar to a Kubernetes Pod.

Which command creates a Pod named `mypod` with port 8080 exposed?

Answer: podman pod create --name mypod -p 8080:8080

`podman pod create --name mypod -p 8080:8080` creates a new Pod and configures port mapping on the infra container.

What is the purpose of `skopeo` in a RHEL container workflow?

Answer: Inspects and copies container images between registries without running them

`skopeo` is a tool for inspecting, copying, and deleting container images in various registries without needing to pull them locally.

What is `buildah` used for in the RHEL container toolchain?

Answer: Building and modifying OCI container images

`buildah` is a tool for building OCI-compliant container images, used as the build backend for Podman.

How do you enable a Podman container to start automatically at system boot (as root)?

Answer: Generate a systemd unit with `podman generate systemd`, copy to `/etc/systemd/system/`, then `systemctl enable`

Generate the systemd unit file with `podman generate systemd`, place it in `/etc/systemd/system/`, and enable it with `systemctl enable --now`.

Which registry configuration file defines trusted registries for Podman image pulls?

Answer: /etc/containers/registries.conf

`/etc/containers/registries.conf` defines trusted registries, unqualified search registries, and blocked registries for container tools.