# System-related configuration

This Ansible playbook can install and configure various system-related things for you.
All the sections below relate to the host OS instead of the managed containers.

### swap

To enable [swap](https://en.wikipedia.org/wiki/Memory_paging) management (also read more in the [Swap](https://wiki.archlinux.org/title/Swap) article in the [Arch Linux Wiki](https://wiki.archlinux.org/)), add the following configuration to your `vars.yml` file and re-run the [installation](../installing.md) process:

```yaml
########################################################################
#                                                                      #
# system                                                               #
#                                                                      #
########################################################################

system_swap_enabled: true

########################################################################
#                                                                      #
# /system                                                              #
#                                                                      #
########################################################################
```

A swap file will be created in `/var/swap` (configured using the `system_swap_path` variable) and enabled in your `/etc/fstab` file.

By default, the swap file will have the following size:

- on systems with `<= 2GB` of RAM, swap file size = `total RAM * 2`
- on systems with `> 2GB` of RAM, swap file size = `1GB`

To avoid these calculations and set your own size explicitly, set the `system_swap_size` variable in megabytes, example (4gb):

```yaml
system_swap_size: 4096
```