---
title: Archlinux
date: 2023-11-29T20:33:48+0100
lastmod: 2024-04-21T17:15:40+0000
tags:
  - archlinux

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---

## Predictable network interfaces

Get back the "old" interface names like `eth0` or `wlan0` with
[systemd.link](https://www.man.page/5/systemd.link).

### Ethernet

This makes my ethernet interface be called **eth0** again.

Create `/usr/lib/systemd/network/80-ether.link` with this content:

~~~systemd
[Match]
Type=ether

[Link]
NamePolicy=keep kernel
~~~

Reboot.

### Wireless

This makes my wireless interface be called **wlan0** again.

Create `/usr/lib/systemd/network/80-wlan.link` with this content:

~~~systemd
[Match]
Type=wlan

[Link]
NamePolicy=keep kernel
~~~

Reboot.

## Setup WiFi networks

### Using **iwctl**

~~~console
$ iwctl device list
$ iwctl station wlan0 scan
$ iwctl station wlan0 get-networks
$ iwctl station wlan0 connect {ssid}
~~~

### Using **nmcli** (NetworkManager)

~~~console
$ nmcli device wifi list
$ nmcli device wifi rescan
$ nmcli device wifi connect {ssid} --ask
$ nmcli device wifi show-password
~~~

Last command shows the connected SSID and a QR-code within the terminal.

## Using NetworkManager

We create some files in `/etc/NetworkManager/conf.d`:

## Using `iwd` as the WiFi backend

`wifi_backend.conf`:

~~~ini
[device]
wifi.backend=iwd
~~~

## Using `dhcpcd` as DHCP client

`dhcp-client.conf`:

~~~ini
[main]
dhcp=dhcpcd
~~~

## Do not manage one specific USB dongle

`99-unmanaged-devices.conf`:

~~~ini
[keyfile]
unmanaged-devices=mac:xx:xx:xx:xx:xx:xx
~~~

## Prefer local DNS instead of systemd-resolved defaults

<https://unix.stackexchange.com/a/442599>

## CPU frequency scaling

<https://wiki.archlinux.org/title/CPU_frequency_scaling>

## YubiKeys

<https://wiki.archlinux.org/title/YubiKey>

## LunarVim custom key mappings

I know, this is an Arch Linux post but hey, I don't care.

<https://github.com/LunarVim/LunarVim/issues/2602>

## Mounting nfs shares with systemd

<https://wiki.archlinux.org/title/NFS#Mount_using_/etc/fstab_with_systemd>

### Arch Linux ARM installation on a Raspberry Pi 2

The wiki page is for Raspberry Pi 4.

<https://archlinuxarm.org/platforms/armv8/broadcom/raspberry-pi-4>

## Create a 32-bit Wine prefix

I create my wine prefixes usually like this:

~~~console
$ export WINEPREFIX=/home/dominic/.wine-winlink
$ export WINEARCH=win32
$ wine wineboot
~~~

## Installing multiple ruby versions

I came to the point to test an older website from me and it was made with
Jekyll which I had to install quickly. Problems occured with OpenSSL and I
finally managed to install ruby version 2.7.1 and 3.0.0 in my home directory.

~~~console
$ rvm pkg install openssl
$ rvm install "ruby-3.0.0" --with-openssl-dir=$HOME/.rvm/usr
$ rvm install "ruby-2.7.1" --with-openssl-dir=$HOME/.rvm/usr
~~~

Later in the desired directory, I re-installed the gems because with ruby 2.7.1
I got another "Directory not found" error.

I had to do this because I used ruby 2.7.1 on one website.

~~~console
$ bundle install --force
~~~