mattiaslundberg

# Install ARCH Linux with encrypted file-system and UEFI
# The official installation guide (https://wiki.archlinux.org/index.php/Installation_Guide) contains a more verbose description.

# Download the archiso image from https://www.archlinux.org/
# Copy to a usb-drive
dd if=archlinux.img of=/dev/sdX bs=16M && sync # on linux

# Boot from the usb. If the usb fails to boot, make sure that secure boot is disabled in the BIOS configuration.

# Set swedish keymap

drmalex07

#!/bin/bash

#
# Example using getopt (vs builtin getopts) that can also handle long options.
# Another clean example can be found at:
# http://www.bahmanm.com/blogs/command-line-options-how-to-parse-in-bash-using-getopt
#

aflag=n
bflag=n

AgentOak

Last updated: April 2021

Also known as itag or format codes and way back they could be specified with the fmt parameter (e.g. &fmt=22). Depending on the age and/or popularity of the video, not all formats will be available.

DASH video

Resolution	AV1 HFR High	AV1 HFR	AV1	VP9.2 HDR HFR	VP9 HFR	VP9	H.264 HFR	H.264
	MP4	MP4	MP4	WebM	WebM	WebM	MP4	MP4

mcastelino

Tracing QEMU-KVM Interactions

But default in linux you can figure out how many times and for what reasons there is a VM Exit from a VM into the kvm kernel module. However given the ubiquity of vhost and the ability of kvm to emulate most device models directly in the kernel, most of those VM exits do not result in a transition from host kernel into the QEMU. The transitions from VM -> kvm -> QEMU are typically the most expensive.

Here we try to figure out how many of the VM Exits result in the invocation of QEMU.

Tracking VM-KVM Interactions

This can be done very simply with perf

jbsulli

Demo:

Spoiler warning

Spoiler text. Note that it's important to have a space after the summary tag. You should be able to write any markdown you want inside the <details> tag... just make sure you close <details> afterward.

console.log("I'm a code block!");

magnetikonline

Bash getopt long options with values usage example

#!/bin/bash -e

ARGUMENT_LIST=(
  "arg-one"
  "arg-two"
  "arg-three"
)

thaJeztah

Silly experiments with RUN --mount

relates to moby/moby#32507, moby/buildkit#442

Doing some silly experimenting with RUN --mount:

# syntax=docker/dockerfile:1

FROM alpine AS stage1

caruccio

This example shows how to read options and positional arguments from a bash script (same principle can be applied for other shells).

# some global var we want to overwrite with options
force=false
help=false
log=info
ARGS=() ### this array holds any positional arguments, i.e., arguments not started with dash

while [ $# -gt 0 ]; do

CRTified

VFIO Setup on NixOS

Disclaimer: Nobody else tested my setup so far, so this is a "works on my machine" scenario. I am not responsible for anything you break on your machine (although I'd not expect much harm).

Hardware

My system has the following hardware:

• Board: ASRock X570 Pro4

eoli3n

# Install docker or podman package on your distro (podman doesn't need a daemon like dockerd to work). All args are exactly same, just replace ``podman`` with ``docker`` in command if you want to.
sudo pacman -S podman

# Run an archlinux container with dbus and wayland sockets.
sudo podman run                                                    \
  --volume "$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY":/tmp/wayland-0 \
  --device /dev/dri                                           \
  --volume /run/user/1000/bus:/tmp/bus              \
  --rm -it archlinux /bin/bash