Gemstones: Add Podman entry

docs/gemstones/containers/podman.md

@@ -0,0 +1,60 @@
+---
+title: Podman
+author: Neel Chauhan
+contributors: Steven Spencer
+date: 2024-03-07
+tags:
+  - docker
+  - podman
+---
+
+# Introduction
+
+[Podman](https://podman.io/) is a Docker-compatible alternative container runtime that, unlike Docker, is included in the Rocky Linux repositories and can run containers as a `systemd` service.
+
+## Install Podman
+
+Use the `dnf` utility to install Podman:
+
+```
+dnf install podman
+```
+
+## Adding a container
+
+Let us run a [Nextcloud](https://nextcloud.com/) self-hosted cloud platform as an example:
+
+```
+podman run -d -p 8080:80 nextcloud
+```
+
+You will receive a prompt to select the container registry to download from. We will use `docker.io/library/nextcloud:latest` in our example.
+
+Once you have downloaded the Nextcloud container, it will run.
+
+Enter **ip_address:8080** in your web browser (assuming you opened the port in `firewalld`) and set up Nextcloud:
+
+![Nextcloud in container](../images/podman_nextcloud.png)
+
+## Running containers as `systemd` services
+
+As mentioned earlier, you can run Podman containers as `systemd` services. Let us now do it with Nextcloud. Run:
+
+```bash
+podman ps
+``
+
+You will get a list of running containers:
+
+```bash
+04f7553f431a  docker.io/library/nextcloud:latest  apache2-foregroun...  5 minutes ago  Up 5 minutes  0.0.0.0:8080->80/tcp  compassionate_meninsky
+```
+
+To make a `systemd` container and enable it on reboot, run:
+
+```bash
+podman generate systemd --name compassionate_meninsky > /usr/lib/systemd/system/nextcloud.service
+systemctl enable nextcloud
+```
+
+When your system reboots, Nextcloud will restart in Podman.