How to automatically select bridged network interfaces in Vagrant?

Question

What should I add in Vagrant file to prevent asking (after vagrant up command)

Which interface should the network bridge to?

Answer 1

in your Vagrantfile, you should add

config.vm.network "public_network", bridge: "Intel(R) 82579LM Gigabit Network Connection"

Then it should make vagrant happy (actually its more VirtualBox that is getting happy in this case) and select the correct network adapter for the VM

Answer 2

I simply just took out the config.vm.network :public_network from the vagrant config file.

And vagrant booted up without asking me that weird question about bridge interface to connect to the internet.

Answer 3

You can actually provide a list of bridges and Virtualbox will cycle through them until it finds one that it can use. Put these in order of how you want them to be tried:

For example on my OSX Macbook:

  config.vm.network "public_network", bridge: [
      "en0: Wi-Fi (AirPort)",    
      "en1: Wi-Fi (AirPort)",
  ]

So in your case:

config.vm.network "public_network", bridge: [
    "Intel(R) 82579LM Gigabit Network Connection",
    "VMware Virtual Ethernet Adapter for VMnet1",
    "VMware Virtual Ethernet Adapter for VMnet8",
]

Answer 4

For Linux, I use the fact that this file is a Ruby script to detect the default route and use the name of that interface. This allows our whole team to use the Vagrantfile as is, without having to hard code interface names or constantly update a list. I would imagine that you could do something similar on Windows or Mac (guessing Mac might actually be the same, since it is *nix).

As a note, if no default network interface is detected, you will still be prompted to select one.

# Grab the name of the default interface
$default_network_interface = `ip route | awk '/^default/ {printf "%s", $5; exit 0}'`
...
Vagrant.configure("2") do |config|
    # Specify the interface when creating the public network
    config.vm.network "public_network", bridge: "#$default_network_interface"
    ...
end