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Discourse Developer Install Guide (Vagrant)

We require Vagrant 1.1.2+ for our Vagrant image to work. You may have to upgrade if you are running an earlier release.

If you'd like to set up a development environment for Discourse, the easiest way is by using a virtual machine. If you have experience setting up Rails projects, you might want to take a look at our Discourse Advanced Developer Guide. It also contains instructions on building your own Vagrant VM.

The following instructions will automatically download and provision a virtual machine for you to begin hacking on Discourse with:

Getting Started

  1. Install Git: http://git-scm.com/downloads (or GitHub for Windows if you want a GUI)
  2. Install VirtualBox: https://www.virtualbox.org/wiki/Downloads
  3. Install Vagrant: http://www.vagrantup.com/
  4. Open a terminal
  5. Clone the project: git clone git@github.com:discourse/discourse.git
  6. Enter the project directory: cd discourse

Using Vagrant

When you're ready to start working, boot the VM:

vagrant up

Vagrant will prompt you for your admin password. This is so it can mount your local files inside the VM for an easy workflow.

(The first time you do this, it will take a while as it downloads the VM image and installs it. Go grab a coffee.)

If you are having trouble downloading the VM:

Note to OSX/Linux users: Vagrant will mount your local files via an NFS share. Therefore, make sure that NFS is installed or else you'll receive the error message:

Mounting NFS shared folders failed. This is most often caused by the NFS
client software not being installed on the guest machine. Please verify
that the NFS client software is properly installed, and consult any resources
specific to the linux distro you're using for more information on how to
do this.

Once the machine has booted up, you can shell into it by typing:

vagrant ssh

Note to Windows users: You cannot run vagrant ssh from a cmd prompt; you'll receive the error message:

`vagrant ssh` isn't available on the Windows platform. You are still able
to SSH into the virtual machine if you get a Windows SSH client (such as
PuTTY). The authentication information is shown below:

Host: 127.0.0.1
Port: 2222
Username: vagrant
Private key: C:/Users/Your Name/.vagrant.d/insecure_private_key

At this point, you will want to get an SSH client, and use it to connect to your Vagrant VM instead. We recommend PuTTY:

PuTTY Download Link

You may use this client to connect to the VM by using vagrant/vagrant as your username/password, or by using PuTTYGen to import the insecure_private_key file (mentioned above) into a PuTTY profile to quickly access your VM.

Keeping your VM up to date

Now you're in a virtual machine is almost ready to start developing. It's a good idea to perform the following instructions every time you pull from master to ensure your environment is still up to date.

bundle install
bundle exec rake db:migrate
bundle exec rake db:seed_fu

Starting Rails

Once your VM is up to date, you can start a rails instance using the following command:

bundle exec rails s

In a few seconds, rails will start serving pages. To access them, open a web browser to http://localhost:4000 - if it all worked you should see discourse! Congratulations, you are ready to start working!

You can now edit files on your local file system, using your favorite text editor or IDE. When you reload your web browser, it should have the latest changes.

Changing the Seed Data

By default, the Vagrant virtual machine comes seeded with test data. You'll have a few topics to play around with and some user accounts. If you'd like to use the default production seed data instead you can execute the following commands:

vagrant ssh
cd /vagrant
psql discourse_development < pg_dumps/production-image.sql
rake db:migrate
rake db:test:prepare

If you change your mind and want to use the test data again, just execute the above but using pg_dumps/development-image.sql instead.

Guard + Rspec

If you're actively working on Discourse, we recommend that you run Guard. It'll automatically run our unit tests over and over, and includes support for live CSS reloading.

To use it, follow all the above steps. Once rails is running, open a new terminal window or tab, and then do this:

vagrant ssh
bundle exec rake db:test:prepare
bundle exec guard -p

Wait a minute while it runs all our unit tests. Once it has completed, live reloading should start working. Simply save a file locally, wait a couple of seconds and you'll see it change in your browser. No reloading of pages should be necessary for the most part, although if something doesn't update you should refresh to confirm.

Sending Email

Mail is sent asynchronously by Sidekiq, so you'll need to have sidekiq running to process jobs. Run it with this command:

bundle exec sidekiq

Mailcatcher is used to avoid the whole issue of actually sending emails: https://github.com/sj26/mailcatcher

To start mailcatcher, run the following command in the vagrant image:

mailcatcher --http-ip 0.0.0.0

Then in a browser, go to http://localhost:4080

Sent emails will be received by mailcatcher and shown in its web ui.

Shutting down the VM

When you're done working on Discourse, you can shut down Vagrant like so:

vagrant halt