[LINUX] [Note] WSL2 kernel build and use

Overview

On Ubuntu 20.04 of WSL2, build the kernel source brought from kernel.org and use it as the kernel of WSL2.

environment

• Windows 10 (2004)
• Ubuntu 20.04 on WSL2 --Try using stable: 5.9.6 2020-11-05

procedure

1. Install build tool

   sudo apt update && \
   sudo apt install -y build-essential flex bison libssl-dev libelf-dev pkg-config libncurses-dev
   

2. Download kernel source

   • https://www.kernel.org/
     > stable: 5.9.6 2020-11-05 [tarball]

   cd ~
   wget https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.9.6.tar.xz
   tar xvf linux-5.9.6.tar.xz
   cd linux-5.9.6
   

3. Get .config

   • https://github.com/microsoft/WSL2-Linux-Kernel/blob/master/Microsoft/config-wsl

   rm -rfv .config
   wget https://raw.githubusercontent.com/microsoft/WSL2-Linux-Kernel/master/Microsoft/config-wsl -O .config
   

4. make menuconfig Exit with <Exit> => <Yes>

5. Build

   make -j 5 && sudo make modules_install`
   

6. Copy the kernel image (eg C: \ wslkernel \ kernel-5.9.6)

   mkdir -p /mnt/c/wslkernel
   cp -v arch/x86/boot/bzImage /mnt/c/wslkernel/kernel-5.9.6
   

7. C:\Users\<username>\.wslconfig

   [wsl2]
   #memory=2GB
   #processors=2
   kernel=C:\\wslkernel\kernel-5.9.6
   localhostForwarding=true
   swap=0
   

Note that there are two backslashes (\\) in the path specification.

8. Open PowerShell as an administrator and shut down the kernel.

   wsl --shutdown
   

   

9. Restart Ubuntu

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