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WSL generates wrong /etc/hosts file when host system is not part of domain #12275

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jonasPoehler opened this issue Nov 15, 2024 · 3 comments
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@jonasPoehler
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Windows Version

Microsoft Windows [Version 10.0.22631.4460]

WSL Version

2.3.26.0

Are you using WSL 1 or WSL 2?

  • WSL 2
  • WSL 1

Kernel Version

5.15.167.4-1

Distro Version

Ubuntu 24.04

Other Software

No response

Repro Steps

I have a Windows device with the following local hostname (FQDN)

PS C:> [System.Net.Dns]::GetHostByName($env:computerName).HostName
DESKTOP-30N6MHG

Install a Ubuntu 24.04 (maybe even other distros) via wsl --import.

Expected Behavior

The /etc/hosts/ file should contain only one entry for the host, meaning the "regular" hostname:

# This file was automatically generated by WSL. To stop automatic generation of this file, add the following entry to /etc/wsl.conf:
# [network]
# generateHosts = false
127.0.0.1       localhost
127.0.1.1       DESKTOP-30N6MHG
 
# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

Actual Behavior

When I install a new WSL-Ubuntu-Distro via wsl --import and then start the system, the /etc/hosts/ (generated by WSL) file looks like this:

# This file was automatically generated by WSL. To stop automatic generation of this file, add the following entry to /etc/wsl.conf:
# [network]
# generateHosts = false
127.0.0.1       localhost
127.0.1.1       DESKTOP-30N6MHG.        DESKTOP-30N6MHG
 
# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

As you can see, the entry with the hostname contains two entries: DESKTOP-30N6MHG. (yes, with a trailing dot) and DESKTOP-30N6MHG. This results in the FQDN inside WSL to be DESKTOP-30N6MHG., which some software (e.g. Postfix) cannot handle. Additionally according to the manpage of hosts, hostnames have to end in an alphanumeric character, which is probably why software cannot handle this behaviour.

Diagnostic Logs

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Logs are required for review from WSL team

If this a feature request, please reply with '/feature'. If this is a question, reply with '/question'.
Otherwise please attach logs by following the instructions below, your issue will not be reviewed unless they are added. These logs will help us understand what is going on in your machine.

How to collect WSL logs

Download and execute collect-wsl-logs.ps1 in an administrative powershell prompt:

Invoke-WebRequest -UseBasicParsing "https://raw.githubusercontent.com/microsoft/WSL/master/diagnostics/collect-wsl-logs.ps1" -OutFile collect-wsl-logs.ps1
Set-ExecutionPolicy Bypass -Scope Process -Force
.\collect-wsl-logs.ps1

The script will output the path of the log file once done.

If this is a networking issue, please use collect-networking-logs.ps1, following the instructions here

Once completed please upload the output files to this Github issue.

Click here for more info on logging
If you choose to email these logs instead of attaching to the bug, please send them to [email protected] with the number of the github issue in the subject, and in the message a link to your comment in the github issue and reply with '/emailed-logs'.

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@focknecht
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Here are the logs:

https://aka.ms/AAtgi7o

@jonasPoehler
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Maybe I need to point to the logs, in order for the bot to remove the label?

Here are the logs:

https://aka.ms/AAtgi7o

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