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adripo/boot.sh

Forked from ThePlenkov/boot.sh
Created February 20, 2024 15:33
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Resolve WSL DNS automatically
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boot.sh
#!/bin/bash
# Remove existing "nameserver" lines from /etc/resolv.conf
sudo sed -i '/nameserver/d' /etc/resolv.conf
# Run the PowerShell command to generate "nameserver" lines and append to /etc/resolv.conf
# we use full path here to support boot command with root user
/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe -Command '(Get-DnsClientServerAddress -AddressFamily IPv4).ServerAddresses | ForEach-Object { "nameserver $_" }' | sudo tee -a /etc/resolv.conf > /dev/null
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resolve_wsl_dns.md

How to resolve DNS issue in WSL once and foreever

There are tons of gists available for this problem:

However even solution is there - I was not satisfied that this probalem alaways persists and I had to do same steps again from time to time

This guide describes the permanent solution using brand-new WSL boot command.

Prepare boot config

  • login to your wsl and run sudo bash. It's important that you do this with a root user because it's a user which executes this command during boot
  • change to ~ folder ( or use any folder you like )
  • create a new file for example boot.sh and update it with a content from boot.sh gist
  • make it executable with chmod +x boot.sh
  • create a symbolic link in one of PATH folders ( keep in mind, that for root user number of path folders is very limited by default )
/usr/local/sbin
/usr/local/bin
/usr/sbin
/usr/bin
/sbin
/bin
  • i have used ln -s ~/boot.sh /usr/local/bin/boot.sh
  • having such a limited list of folders makes root not aware of powershell.exe and rest of window utilities. I have preferred to use an absolute path like /mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe in my script - but you may think of creating a symlink for powershell too.
  • now let's add boot command to /etc/wsl.conf file. In my case it looks like this:
[network]
generateResolvConf=false
[boot]
systemd=true
command=boot.sh
  • now just exit from bash, from wsl as well. Terminate your wsl with a command like wsl -t Ubuntu and start again
  • if everything went well cat /etc/resolv.conf should have nameservers from your Windows
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