Using Environment Variables in a Vagrant File

An easy way to parameterize a Vagrant file is to use environment variables. You simply need to export a variable and then refer to it in the Vagrant file with the following syntax.

Export the variable:

export SSH_PORT=22222

Sample Vagrant file that reads the exported variable

# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure("2") do |config|
  config.vm.box = "debian/bullseye64"
  config.vm.box_version = "11.20221219.1"

  config.vm.network "forwarded_port", guest: 22, host: ENV['SSH_PORT']
end