98 lines
5.2 KiB
Markdown
98 lines
5.2 KiB
Markdown
# System-related configuration
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This Ansible playbook can install and configure various system-related things for you.
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All the sections below relate to the host OS instead of the managed containers.
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### swap
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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:
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```yaml
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########################################################################
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# #
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# system #
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# #
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########################################################################
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system_swap_enabled: true
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########################################################################
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# #
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# /system #
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# #
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########################################################################
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```
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A swap file will be created in `/var/swap` (configured using the `system_swap_path` variable) and enabled in your `/etc/fstab` file.
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By default, the swap file will have the following size:
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- on systems with `<= 2GB` of RAM, swap file size = `total RAM * 2`
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- on systems with `> 2GB` of RAM, swap file size = `1GB`
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To avoid these calculations and set your own size explicitly, set the `system_swap_size` variable in megabytes, example (4gb):
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```yaml
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system_swap_size: 4096
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```
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**Warning**: changing `system_swap_size` subsequently will not recreate the SWAP file with the new size. You will need to disable swap, re-run the playbook (to make it clean up), then enable it again with the new size.
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### ssh
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> **Warning**: advanced functionality! While the default config with a few adjustments was battle tested on hundreds of servers,
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> you should use it with caution and verify everything before you apply the changes!
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To enable [ssh server](https://www.openssh.com/) config and authorized/unauthorized keys management, add the following configuration to your `vars.yml` file and re-run the [installation](../installing.md) process:
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```yaml
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########################################################################
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# #
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# system #
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# #
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########################################################################
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system_security_ssh_enabled: true
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system_security_ssh_port: 22
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system_security_ssh_authorizedkeys: [] # list of authorized public keys
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system_security_ssh_unauthorizedkeys: [] # list of unauthorized/revoked public keys
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########################################################################
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# #
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# /system #
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# #
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########################################################################
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```
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The [default configuration](https://gitlab.com/etke.cc/roles/ssh/-/blob/main/defaults/main.yml) is good enough as-is, but we strongly suggest you to **verify everything before applying any changes!**, otherwise you may lock yourself out of the server.
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With this configuration, the default `/etc/ssh/sshd_config` file on your server will be replaced by a new one, managed by the [ssh role](https://gitlab.com/etke.cc/roles/ssh) (see its [templates/etc/ssh/sshd_config.j2](https://gitlab.com/etke.cc/roles/ssh/-/blob/main/templates/etc/ssh/sshd_config.j2) file).
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There are various configuration options - check the defaults and adjust them to your needs.
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### fail2ban
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To enable [fail2ban](https://fail2ban.org/wiki/index.php/Main_Page) installation, management and integration with SSHd, add the following configuration to your `vars.yml` file and re-run the [installation](../installing.md) process:
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```yaml
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########################################################################
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# #
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# system #
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# #
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########################################################################
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system_security_fail2ban_enabled: true
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system_security_fail2ban_sshd_port: 22
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# If you enabled playbook-managed ssh as described above,
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# you can replace the line above with the following:
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# system_security_fail2ban_sshd_port: "{{ system_security_ssh_port }}"
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########################################################################
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# #
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# /system #
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# #
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########################################################################
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```
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