» Forwarded Ports

Network identifier: forwarded_port

Vagrant forwarded ports allow you to access a port on your host machine and haveall data forwarded to a port on the guest machine, over either TCP or UDP.

For example: If the guest machine is running a web server listening on port 80,you can make a forwarded port mapping to port 8080 (or anything) on your hostmachine. You can then open your browser to localhost:8080 and browse thewebsite, while all actual network data is being sent to the guest.

» Defining a Forwarded Port

The forwarded port configuration expects two parameters, the port on theguest and the port on the host. Example:

  1. Vagrant.configure("2") do |config|
  2.   config.vm.network "forwarded_port", guest: 80, host: 8080
  3. end

This will allow accessing port 80 on the guest via port 8080 on the host.

For most providers, forwarded ports by default bind to all interfaces. Thismeans that other devices on your network can access the forwarded ports.If you want to restrict access, see the guest_ip and host_ip settingsbelow.

» Options Reference

This is a complete list of the options that are available for forwardedports. Only the guest and host options are required. Below this section,there are more detailed examples of using these options.

  • auto_correct (boolean) - If true, the host port will be changed automatically in case it collides with a port already in use. By default, this is false.

  • guest (int) - The port on the guest that you want to be exposed onthe host. This can be any port.

  • guest_ip (string) - The guest IP to bind the forwarded port to. Ifthis is not set, the port will go to every IP interface. By default,this is empty.

  • host (int) - The port on the host that you want to use to access theport on the guest. This must be greater than port 1024 unless Vagrantis running as root (which is not recommended).

  • host_ip (string) - The IP on the host you want to bind the forwardedport to. If not specified, it will be bound to every IP. By default,this is empty.

  • protocol (string) - Either "udp" or "tcp". This specifies the protocolthat will be allowed through the forwarded port. By default this is "tcp".

  • id (string) - Name of the rule (can be visible in VirtualBox). By default this is "protocol""guest" (example : "tcp123").

» Forwarded Port Protocols

By default, any defined port will only forward the TCP protocol. As an optionalthird parameter, you may specify protocol: 'udp' in order to pass UDPtraffic. If a given port needs to be able to listen to the same port on bothprotocols, you must define the port twice with each protocol specified, likeso:

  1. Vagrant.configure("2") do |config|
  2.   config.vm.network "forwarded_port", guest: 2003, host: 12003, protocol: "tcp"
  3.   config.vm.network "forwarded_port", guest: 2003, host: 12003, protocol: "udp"
  4. end

» Port Collisions and Correction

It is common when running multiple Vagrant machines to unknowingly createforwarded port definitions that collide with each other (two separateVagrant projects forwarded to port 8080, for example). Vagrant includesbuilt-in mechanism to detect this and correct it, automatically.

Port collision detection is always done. Vagrant will not allow you todefine a forwarded port where the port on the host appears to be acceptingtraffic or connections.

Port collision auto-correction must be manually enabled for each forwardedport, since it is often surprising when it occurs and can lead the Vagrantuser to think that the port was not properly forwarded. Enabling auto correctis easy:

  1. Vagrant.configure("2") do |config|
  2.   config.vm.network "forwarded_port", guest: 80, host: 8080,
  3.     auto_correct: true
  4. end

The final :auto_correct parameter set to true tells Vagrant to autocorrect any collisions. During a vagrant up or vagrant reload, Vagrantwill output information about any collisions detections and auto correctionsmade, so you can take notice and act accordingly.

You can define allowed port range assignable by Vagrant when port collision isdetected via config.vm.usable_port_range property.

  1. Vagrant.configure("2") do |config|
  2.   config.vm.usable_port_range = 8000..8999
  3. end