Disable Selinux
Edit this /etc/selinux/config file and follow instructions
posts/
Disable Wayland and switch to X11
By default fedora uses Wayland. Make sure the following section exists in /etc/gdm/custom.conf:
[daemon]
# Uncomment the line below to force the login screen to use Xorg
WaylandEnable=false
DefaultSession=gnome-xorg.desktop
Record all traffic on specific port
Create TCP dump of all traffic on localhost on port 8888
sudo tcpdump -i lo "port 8888" -w dump
tar: Archives cheatsheet
Create archive:
tar -czvf compressed_file.tar.gz original_file.sql
Extract files:
tar -xzvf compressed_file.tar.gz
Keep running ssh command after disconnecting from the server
nohup database_migration.sh &
nohupwill take care of running the command and forward command output tonohup.out&will run the command in the background
Use tail -f nohup.out to get the output from the command
Configure HP printer in fedora
Default Printer application in GNOME (fedora 33) is not able to successfully configure wireless printer, it needs to be done manually:
sudo dnf install hplip hplip-gui
sudo hp-setup
Select Network/Ethernet/Wireless network and your printer will appear in the list. Follow the instructions and add the printer.
List files installed by a package
To list all files installed by dnf package:
rpm -ql dnf
top-like application for intel GPU
Top-like application to monitor performance of intel GPU:
sudo dnf install igt-gpu-tools
sudo intel_gpu_top
Playing 4k video sample on youtube (intel i3-8100T):
intel-gpu-top: Intel Coffeelake (Gen9) @ /dev/dri/card0 - 1063/1083 MHz; 1% RC6; 7.35/19.18 W; 467 irqs/s
IMC reads: 6889 MiB/s
IMC writes: 3901 MiB/s
ENGINE BUSY MI_SEMA MI_WAIT
Render/3D/0 98.29% |██████████████████████████████████▍| 0% 0%
Blitter/0 0.00% | | 0% 0%
Video/0 0.00% | | 0% 0%
VideoEnhance/0 0.00% | | 0% 0%
Playing the same video in 1080p (intel i3-8100T)::
intel-gpu-top: Intel Coffeelake (Gen9) @ /dev/dri/card0 - 591/ 591 MHz; 30% RC6; 3.06/ 6.47 W; 474 irqs/s
IMC reads: 4058 MiB/s
IMC writes: 2654 MiB/s
ENGINE BUSY MI_SEMA MI_WAIT
Render/3D/0 55.64% |███████████████████▍ | 0% 0%
Blitter/0 0.00% | | 0% 0%
Video/0 0.00% | | 0% 0%
VideoEnhance/0 0.00% | | 0% 0%
Install multimedia codecs in fedora
If you are experiencing high CPU usage when watching videos on youtube, verify that the following packages are installed (requires RPMFusion repository):
# RPMFuison repositories
sudo dnf install https://mirrors.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm https://mirrors.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
# Codecs
sudo dnf install gstreamer1-plugins-{bad-\*,good-\*,base} gstreamer1-plugin-openh264 gstreamer1-libav --exclude=gstreamer1-plugins-bad-free-devel
sudo dnf install lame\* --exclude=lame-devel
sudo dnf group upgrade --with-optional Multimedia
CPU usage for i3-8100T is down from 80% to 50% with this video sample
Monitor thread count
watch -n 0.5 "ps -eLf | grep traffic_server | wc -l"