WSL v2 windows hosts sync (powershell - updates domains to wsl2 ip)

wsl2-hosts-sync.ps1

# Requires -RunAsAdministrator
# Only works for WSL v2,  this is completely not needed for WSL v1 where u always can use 127.0.0.1 in hosts file

Clear-Host

if ((Get-InstalledModule "Carbon" -ErrorAction SilentlyContinue) -eq $null) {
    Install-Module -Name 'Carbon' -AllowClobber
}

Import-Module 'Carbon'

$wslIp = (wsl hostname -I) -replace ' ',''

Write-Host "Setting wsl v2 hosts entries to $wslIp"

$domains = @(
    'wsl2.local'
    # add more domains if necessary
)

foreach($domain in $domains) {
    Set-HostsEntry -IPAddress $wslIp -HostName $domain
}

Write-Host "Done!"

# Requires -RunAsAdministrator
# Only works for WSL v2,  this is completely not needed for WSL v1 where u always can use 127.0.0.1 in hosts file
$currentUser = New-Object Security.Principal.WindowsPrincipal $([Security.Principal.WindowsIdentity]::GetCurrent())
$testadmin = $currentUser.IsInRole([Security.Principal.WindowsBuiltinRole]::Administrator)
if ($testadmin -eq $false) {
Start-Process powershell.exe -Verb RunAs -ArgumentList ('-noprofile -noexit -file "{0}" -elevated' -f ($myinvocation.MyCommand.Definition))
exit $LASTEXITCODE
}


Clear-Host

if ((Get-InstalledModule "Carbon" -ErrorAction SilentlyContinue) -eq $null) {
    Install-Module -Name 'Carbon' -AllowClobber
}

Import-Module 'Carbon'

$wslHostIp = (wsl cat /etc/resolv.conf | Select-String -Pattern "\d{1,3}(\.\d{1,3}){3}" -AllMatches).Matches.Value
$wslSelfIp = (wsl hostname -I) -replace ' ',''

Write-Host "Setting wsl v2 host ip to $wslHostIp"
Write-Host "Setting wsl v2 self ip to $wslSelfIp"

$wsl_host_domains = @(
    'wsl2.host'
)
$wsl_self_domains = @(
    'wsl2.self'
)

foreach($domain in $wsl_host_domains) {
    Set-HostsEntry -IPAddress $wslHostIp -HostName $domain
}

foreach($domain in $wsl_self_domains) {
    Set-HostsEntry -IPAddress $wslSelfIp -HostName $domain
}

Write-Host "Done!"

This is the script that I changed a little bit.

#!/bin/sh
export WINIP=$(cat /etc/resolv.conf | grep 'nameserver' | cut -f 2 -d ' ') 
export WSLIP=$(ip addr show eth0 | grep 'inet ' | cut -f 6 -d ' ' | cut -f 1 -d '/')
echo WINIP $WINIP
echo WSLIP $WSLIP

echo <Your Password> | sudo -S sed -i "/winip/c $WINIP\twinip" /etc/hosts
echo <Your Password> | sudo -S sed -i "/wslip/c $WSLIP\twslip" /etc/hosts

vim "+:%s/^.*winip/$WINIP\t\twinip/g" "+:%s/^.*wslip/$WSLIP\t\twslip/g" '+:wq' -E /mnt/c/Windows/System32/drivers/etc/hosts 

This is another solution. Run this script in ~/.bashrc can set hosts file both in win and linux.

Hi Guys!
The @derik007 bash version not working. :(
This is my version using Powershell; https://github.com/kallookoo/lamp/blob/feccb3e3c507f2d97afcc0962cb7e449ec0eeffb/src/win/hosts.ps1

Amazing. Thank you. It's perfect for my use case.

just for info, the @derik007 solution needs to use PowerShell as admin and execute "wsl", I've changed the last line :

vim "+:%s/^.*winip/$WINIP\t\twinip/g" "+:%s/^.*wslip/$WSLIP\t\twslip/g" '+:wq' -E /mnt/c/Windows/System32/drivers/etc/hosts

to

vi "+:%s/^.*wsl2.local/^$WSLIP wsl2.local/g" "+:wq" -E /mnt/c/Windows/System32/drivers/etc/hosts

I forked: https://gist.github.com/kakkun61/2139c240ac0dce1bb1606c1e8bc8038c

Added features:

• admin check
• run as admin
• install Carbon module if necessary
• remove old hosts entry
• multiple ip addr support

FWIW, my take can be found at https://gist.github.com/petski/1414048ca2db37592da2e7af13d718f5