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Update containers documentation to mention XDG_CONFIG_HOME for configuration #133

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Jun 5, 2025
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Update containers documentation to mention XDG_CONFIG_HOME for configuration #133

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10 changes: 9 additions & 1 deletion docs/build-install/containers.md
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Expand Up @@ -6,7 +6,7 @@ Its command-line interface (CLI) closely mirrors Docker’s, providing a consist

## Preliminary step: configuring Podman's storage

The first step in order to use Podman on Alps is to create a valid Container Storage configuration file at `$HOME/.config/containers/storage.conf`, according to the following minimal template:
The first step in order to use Podman on Alps is to create a valid Container Storage configuration file at `$HOME/.config/containers/storage.conf` (or `$XDG_CONFIG_HOME/containers/storage.conf`, if you have `$XDG_CONFIG_HOME` set), according to the following minimal template:

```toml
[storage]
Expand All @@ -21,6 +21,14 @@ graphroot = "/dev/shm/$USER/root"
The limitation of this approach is that container images created during a job allocation are deleted when the job ends.
Therefore, the image needs to either be pushed to a container registry or imported by the Container Engine before the job allocation finishes.

You can use

```bash
podman info | grep -A 2 "store:"
```

to check that the correct `storage.conf` file is used by Podman (`store:configFile` field).

## Building images with Podman

The easiest way to build a container image is to rely on a Containerfile (a more generic name for a container image recipe, but essentially equivalent to Dockerfile):
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