Containers and Podman Flashcards

What is the primary container tool used in RHEL 8+ instead of Docker?

Answer: Podman

Red Hat replaced Docker with Podman in RHEL 8, offering a daemonless, rootless container experience compatible with Docker CLI syntax.

Which command runs a container from the `ubi8` image interactively with a bash shell?

Answer: podman run -it ubi8 bash

`podman run -it` creates and starts a container interactively (`-i`) with a pseudo-terminal (`-t`) and runs bash.

What is a key advantage of Podman over Docker in RHEL?

Answer: Supports rootless containers without a background daemon

Podman is daemonless and supports rootless containers, improving security by not requiring a privileged background service.

Which command lists all running containers in Podman?

Answer: podman ps

`podman ps` lists all currently running containers, similar to `docker ps`.

What command pulls the `httpd` image from the Red Hat registry?

Answer: podman pull registry.access.redhat.com/ubi8/httpd-24

`podman pull` downloads a container image from a specified registry, using the full image path for Red Hat registries.

Which Podman command maps host port 8080 to container port 80?

Answer: podman run -p 8080:80 httpd

The `-p host_port:container_port` flag maps a host port to the container's internal port.