CentOS on Windows Subsytem for Linux (WSL)

I read about the Windows Subsystem for Linux a while back, and thought it was only available using Ubuntu. Today I wanted to play around with it and fish shell, but I prefer centos to ubuntu. A quick google found this github project – WSL Distribution Switcher –

Excellent! It allows you to switch from ubuntu to other linux distro’s. I’m not going to pretend I have taken the time to understand how WSL works ‘under the hood’ but as WSL Switcher gets docker layers / images, I’m guessing it based on docker in some shape or form?

I enabled WSL on my W10 1703 (Creators Update) build, started bash and created myself a user. Installed Python 3 (a requirement for WSL Switcher). Then I cloned the WSL Switcher git project and used the following commands to switch to centos and confirm it worked :

  • get-prebuilt.py centos:latest
  • install.py centos:latest
  • bash
  • cat /etc/centos-release

Everything seemed fine, but then I tried to run yum (the centos package manager). It wouldn’t run as a non root user, fine – tried “sudo yum”. Command not found – grrrrrr

Then I tried su – got prompted for password and thought I had made progress – entered the password for my linux user… nope!

Luckily, I’m not the first person to run into this problem 🙂 I found an issue in the WSL Distro Switcher github with the information I needed. I needed to switch the default user that WSL used, enter WSL / bash, change the passwd, then change the default user back to my non root user.

  • lxrun /setdefaultuser root
  • Found UNIX user: root
    Default UNIX user set to: root
  • bash
  • passwd
    • (enter your desired root password)
  • exit
  • lxrun /setdefaultuser *username*

Now when I went into WSL, I was logged in as my normal user – I could “su” and run commands as root – perfect! However, I like to sudo rather than switch to root using su – more to be done…

I thought the next bits would be easy – but alas no. yum wont work, even now I have access to root user – looks like a network issue. Should be simple to figure out right? I wish, no ifconfig, so i tried “ip addr” – neither work. Why do people insist on taking so much stuff out of an OS as to make it almost useless!

 

I thought that the networking was messed up – it was fine, but DNS resolution was messed up – I ‘resolved’ this by editing resolv.conf, which had a really random IP set for the nameserver! I fixed this and then moved onto to sorting out sudo!

  • yum install sudo
  • exit (to exit su shell back to normal user)
  • sudo yum
    • user is not in the sudoers file. This incident will be reported.
    • so we need to add to the sudoers file
  • su
  • vi /etc/sudoers
    • add a line near the bottom
    • username ALL=(ALL) ALL
  • exit (exit su shell)
  • sudo yum (testing)
    • It works!

Now onto fish commandline…

Its not in the main repos – so I had to first install epel

  • sudo yum install epel-release
  • sudo yum install fish

Now I can enter fish shell after entering WSL bash – i tried a few things to try and set fish as the default shell – but none of them worked. Probably something to do with docker / wsl. I will update this post if i can figure out how to go straight into fish…

 

 

 

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2 thoughts on “CentOS on Windows Subsytem for Linux (WSL)”

  1. Cheers for the tutorial, was able to get the latest CentOS up and running on WSL pretty easily with your help!

    Like

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