6.3 KiB
| title | date | lastmod | tags | showReadingTime | showWordCount | showPagination | showBreadcrumbs | feed_exclude | |
|---|---|---|---|---|---|---|---|---|---|
| Archlinux | 2023-11-29T20:33:48+0100 | 2024-05-26T06:31:47+0000 |
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false | false | false | true | true |
Systemd Unit files
A nice and informative article about unit files.
https://www.digitalocean.com/community/tutorials/understanding-systemd-units-and-unit-files
Predictable network interfaces
Get back the "old" interface names like eth0 or wlan0 with
{{< man systemd.link 5 >}}.
Ethernet
This makes my ethernet interface be called eth0 again.
Create /usr/lib/systemd/network/80-ether.link with this content:
[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:
[Match]
Type=wlan
[Link]
NamePolicy=keep kernel
Reboot.
Setup WiFi networks
Using iwctl
$ iwctl device list
$ iwctl station wlan0 scan
$ iwctl station wlan0 get-networks
$ iwctl station wlan0 connect {ssid}
Using nmcli (NetworkManager)
$ 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:
[device]
wifi.backend=iwd
Using dhcpcd as DHCP client
dhcp-client.conf:
[main]
dhcp=dhcpcd
Blocking IPs from a list with ipset
Using ipset should increase performance on the box, also using the raw table should not create useless states as for what I understand from the source article on serverfault.com.
$ sudo ipset -N badips iphash
$ while read ip; do sudo ipset -A badips "$ip"; done < blocked.txt
$ sudo iptables -t raw -I PREROUTING -m set --match-set badips src,dst -j DROP
$ sudo iptables-save -f /etc/iptables/iptables.rules
Enable iptables in case it is not running yet.
$ sudo systemctl enable --now iptables.service
Also make the ipset configuration persistent:
$ sudo ipset save -file /etc/ipset.conf
$ sudo systemctl enable ipset.service
Reboot to test its persistency.
Do not manage one specific USB dongle
99-unmanaged-devices.conf:
[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:
$ 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.
$ 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.
$ bundle install --force
Bigger font for systemd-boot
Edit /boot/loader/loader.conf:
console-mode 0
Possible settings are:
| Value | Description |
|---|---|
| 0 | Standard UEFI 80x25 mode |
| 1 | 80x50 mode, not supported by all devices |
| 2 | the first non-standard mode provided by the device firmware, if any |
| auto | Pick a suitable mode automatically using heuristics |
| max | Pick the highest-numbered available mode |
| keep | Keep the mode selected by firmware (the default) |
More details can be found in {{< man loader.conf 5 >}}.
Manual sections
| Section | Description |
|---|---|
| 1 | Section 1 of the manual describes user commands and tools, for example, file manipulation tools, shells, compilers, web browsers, file and image viewers and editors, and so on |
| 2 | Section 2 of the manual describes the Linux system calls. A system call is an entry point into the Linux kernel. Usually, system calls are not invoked directly: instead, most system calls have corresponding C library wrapper functions which perform the steps required (e.g., trapping to kernel mode) in order to invoke the system call. Thus, making a system call looks the same as invoking a normal library function. |
| 3 | Section 3 of the manual describes all library functions excluding the library functions (system call wrappers) described in Section 2, which implement system calls. |
| 4 | Section 4 of the manual describes special files (devices). |
| 5 | Section 5 of the manual describes various file formats, as well as the corresponding C structures, if any. |
| 6 | Section 6 of the manual describes the games and funny little programs available on the system. |
| 7 | Section 7 of the manual provides overviews on various topics, and describes conventions and protocols, character set standards, the standard filesystem layout, and miscellaneous other things. |
Encoding videos with ffmpeg
This is not an Arch way of encoding videos, but since I do this on my...
$ ffmpeg -i <input> -c:v libx264 -b:v 1M -maxrate 1M -bufsize 2M -pass 1 -f null /dev/null
$ ffmpeg -i <input> -c:v libx264 -b:v 1M -maxrate 1M -bufsize 2M -pass 2 <output>