Podman in WSL2

For Debian 11 distro in WSL2, following are the commands to install podman (v3.0.1) and configuring it in order to avoid error during execution of podman commands. As in WSL2 there is no systemd so need to update 'cgroup_manager' and 'event_logger'.

 

$ sudo apt-get install podman

$ sudo vim /etc/containers/registries.conf

unqualified-search-registries = ["docker.io"]

 

$ sudo cp /usr/share/containers/containers.conf ${HOME}/.config/containers/libpod.conf 

[engine]
cgroup_manager = "cgroupfs"
events_logger = "file"
 

$ sudo cp ${HOME}/.config/containers/libpod.conf /etc/containers/containers.conf

 

For running Flask application in container, use tiangolo/uwsgi-nginx:python3.8 as base image hosted on docker.io. 

 

$ podman build -t test02

$ podman run --rm --name tester -p 8080:80 localhost/test02

 

Since by default, podman is not allowed to run container on privileged ports like 80, in above example running it on 8080 or else need to edit sysctl.conf

 

$ sudo vim /etc/sysctl.conf

net.ipv4.ip_unprivileged_port_start=0

$ sudo sysctl -p    # to apply changes

It can be accessed from web-browser on host as http://localhost:8080

 

For error "/" is not shared mount:

$ findmnt -o PROPAGATION /
PROPAGATION
private

$ uname -r
5.10.16.3-microsoft-standard-WSL2 

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04 LTS
Release:        22.04
Codename:       jammy

# add in /etc/rc.local or /etc/rc.conf 

$ sudo mount --make-rshared / 

 

$ sudo usermod --add-subuids 10000-75535 USERNAME

$ sudo usermod --add-subgids 10000-75535 USERNAME 

 

gEdit via rdesktop

 gedit via rdesktop unable to change the preference, this is valid if installed in wsl2 on Windows 11 (that support WSLg).

In such cases we can change the gEdit settings via terminal using gsettings command. Following command will output all the available keys in all schemas.

for example,

gsettings list-recursively | grep 'org.gnome.gedit.preferences.editor'

• schema:  org.gnome.gedit.preferences.editor
• key      :  insert-spaces
• value   :  true
  

It is useful to quickly set up gedit on newly installed machine by keeping settings in a bash shell scrip and execute it. Here is my custom gedit settings.

VPN: OpenConnect

For connecting to vpn using openconnect command, we need to install three packages:

• openvpn
• easy-rsa
• openconnect
  

 

In RedHat or CentOS based Linux system:

• $ sudo yum install epel-release                            
• $ sudo yum install -y openvpn easy-rsa
• $ sudo yum install -y openconnect

 

In Debian based Linux system:

• $ sudo apt install -y openvpn easy-rsa
• $ sudo apt install -y openconnect

 

Before connecting to vpn, create tunneling device using openvpn command and make it active. If 'ip' command is not available (on older system) use "sudo ifconfig tun1 up" in step 2

• $ sudo openvpn --mktun --dev tun1
• $ sudo ip link set tun1 up
• $ sudo openconnect <IP-Address> --interface=tun1

Once done, remove the tun1 using following commands:

• $ sudo ip link set tun1 down
  
• $ sudo openvpn --rmtun --dev tun1

ASUS e203MAH

Entering Bootloader of ASUS E203 MAH laptop:

1. Power on the Asus S200e laptop
2. Press and hold F2 key when powering on the Asus S200e laptop to enter the bios.
3. Switch to the “Boot” tab and set “Launch CSM” to Enabled.
4. Switch to the “Security” tab and set “Secure Boot Control” to Disabled.
5. Press F10 to save and exit.
6. Press and hold ESC key to launch the boot menu while the Asus S200e laptop is powering up.

source: https://www.rgb.ie/2015/03/26/how-to-boot-from-usb-drive-on-a-asus-s200e-laptop/
 

Python3 on CentOS 7

• yum -y install https://centos7.iuscommunity.org/ius-release.rpm
• yum -y install python36u
• yum -y install python36u-pip
• yum -y install python36u-devel

 

Create python3 virtual environment:

• python3.6 -m venv myWorkEnvironment
  
• source myWorkEnvironment/bin/activate

Note: python3 is now available by default distros repository and no need to install iuscommunity. Its available directly "sudo yum install -y python3"


Raspberry Pi 3 - Led status

cat /sys/class/leds/led0/trigger
none rc-feedback kbd-scrolllock kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock timer oneshot heartbeat backlight gpio cpu cpu0 cpu1 cpu2 cpu3 default-on input panic mmc1 [mmc0] rfkill-any rfkill0 rfkill1

echo none > /sys/class/leds/led0/trigger

will turn off the led completely (if it becomes annoying)

echo heartbeat > /sys/class/leds/led0/trigger

will cause the led to flash with the linux heartbeat pattern

echo timer > /sys/class/leds/led0/trigger

will cause the led to flash once a second

BerryBoot

Default cmdline.txt

elevator=deadline quiet bootmenutimeout=10


Parameter setting for config.txt

hdmi_force_hotplug=1
hdmi_drive=2
hdmi_group=2
hdmi_mode=81

.