Vagrant and Windows Subsystem for Linux

Vagrant and Windows Subsystem for Linux

Windows has recently introduced a new feature called the Windows Subsystem for Linux (WSL). This is a beta feature available in developer mode on recent releases of Windows 10. It is important to note that this feature is still in beta on Windows, and Vagrant support should be considered alpha.

Warning: Advanced Topic! Using Vagrant within the Windows Subsystem for Linux is an advanced topic that only experienced Vagrant users who are reasonably comfortable with Windows, WSL, and Linux should approach.

Installation

Installation requires WSL, Ubuntu on Windows, and Vagrant. Read on for installation instructions for each item.

Windows Subsystem for Linux and Ubuntu on Windows

First install the Windows Subsystem for Linux, followed by Ubuntu on Windows. This guide from Microsoft walks through the process:

• https://msdn.microsoft.com/en-us/commandline/wsl/install_guide

Vagrant Installation

Vagrant must be installed within Ubuntu on Windows. Even though the vagrant.exe file can be executed from within the WSL, it will not function as expected. To install Vagrant into the WSL, follow these steps:

• Download the 64-bit Debian package from the downloads page.
• Open a cmd or powershell window
• Enter the command: bash
• Install vagrant: sudo dpkg -i vagrant_VERSION_x86_64.deb

C:\Users\vagrant> bash
vagrant@vagrant-10:/mnt/c/Users/vagrant$ sudo dpkg -i vagrant_VERSION_x86_64.deb
[sudo] password for vagrant:
(Reading database ... 31885 files and directories currently installed.)
Preparing to unpack vagrant_VERSION_x86_64.deb ...
Unpacking vagrant (1:VERSION) ...
Setting up vagrant (1:VERSION) ...
vagrant@vagrant-10:/mnt/c/Users/vagrant$ vagrant help
Usage: vagrant [options] <command> [<args>]

Vagrant Usage

Vagrant will detect when it is being run within the WSL and adjust how it locates and executes third party executables. For example, when using the VirtualBox provider Vagrant will interact with VirtualBox installed on the Windows system, not within the WSL. It is important to ensure that any required Windows executable is available within your PATH to allow Vagrant to access them.

Windows Access

Working within the WSL provides a layer of isolation from the actual Windows system. In most cases Vagrant will need access to the actual Windows system to function correctly. As most Vagrant providers will need to be installed on Windows directly (not within the WSL) Vagrant will require Windows access. Access to the Windows system is controlled via an environment variable: VAGRANT_WSL_ENABLE_WINDOWS_ACCESS. If this environment variable is set, Vagrant will access the Windows system to run executables and enable things like synced folders. When running in a bash shell within WSL, the environment variable can be setup like so:

$ export VAGRANT_WSL_ENABLE_WINDOWS_ACCESS="1"

This will enable Vagrant to access the Windows system outside of the WSL and properly interact with Windows executables. This will automatically modify the VAGRANT_HOME environment variable if it is not already defined, setting it to be within the user's home directory on Windows.

It is important to note that paths shared with the Windows system will not have Linux permissions enforced. For example, when a directory within the WSL is synced to a guest using the VirtualBox provider, any local permissions defined on that directory (or its contents) will not be visible from the guest. Likewise, any files created from the guest within the synced folder will be world readable/writeable in WSL.

Other useful WSL related environment variables:

• VAGRANT_WSL_WINDOWS_ACCESS_USER - Override current Windows username
• VAGRANT_WSL_DISABLE_VAGRANT_HOME - Do not modify the VAGRANT_HOME variable
• VAGRANT_WSL_WINDOWS_ACCESS_USER_HOME_PATH - Custom Windows system home path

Using Docker

The docker daemon cannot be run inside the Windows Subsystem for Linux. However, the daemon can be run on Windows and accessed by Vagrant while running in the WSL. Once docker is installed and running on Windows, export the following environment variable to give Vagrant access:

$ vagrant@vagrant-10:/mnt/c/Users/vagrant$ export DOCKER_HOST=tcp://127.0.0.1:2375