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Discourse Advanced Developer Install Guide

This guide is aimed at advanced Rails developers who have installed their own Rails apps before.

Note: If you are developing on a Mac, you will probably want to look at these instructions as well.

Preparing a fresh Ubuntu install

To get your Ubuntu 16.04 or 18.04 LTS install up and running to develop Discourse and Discourse plugins follow the commands below. We assume an English install of Ubuntu.

# Basics
whoami > /tmp/username
sudo add-apt-repository ppa:chris-lea/redis-server
sudo apt-get -yqq update
sudo apt-get -yqq install software-properties-common vim curl expect debconf-utils git-core build-essential zlib1g-dev libssl-dev openssl libcurl4-openssl-dev libreadline6-dev libpcre3 libpcre3-dev imagemagick redis-server advancecomp jhead jpegoptim libjpeg-turbo-progs optipng pngcrush pngquant gnupg2

# Ruby
curl -sSL https://rvm.io/mpapis.asc | gpg2 --import -
curl -sSL https://rvm.io/pkuczynski.asc | gpg2 --import -
curl -sSL https://get.rvm.io | bash -s stable
echo 'gem: --no-document' >> ~/.gemrc

# exit the terminal and open it again to activate RVM

rvm install 2.6.2
rvm --default use 2.6.2 # If this error out check https://rvm.io/integration/gnome-terminal
gem install bundler mailcatcher rake

# Download and install postgresql-10 from https://wiki.postgresql.org/wiki/Apt

# Postgresql
sudo -u postgres -i
createuser --superuser -Upostgres $(cat /tmp/username)
psql -c "ALTER USER $(cat /tmp/username) WITH PASSWORD 'password';"
exit

# Node
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.2/install.sh | bash

# exit the terminal and open it again to activate NVM

nvm install node
nvm alias default node
npm install -g svgo

If everything goes alright, let's clone Discourse and start hacking:

git clone https://github.com/discourse/discourse.git ~/discourse
cd ~/discourse
bundle install

# run this if there was a pre-existing database
bundle exec rake db:drop
RAILS_ENV=test bundle exec rake db:drop

# time to create the database and run migrations
bundle exec rake db:create
bundle exec rake db:migrate
RAILS_ENV=test bundle exec rake db:create db:migrate

# run the specs (optional)
bundle exec rake autospec # CTRL + C to stop

# launch discourse
bundle exec rails s -b 0.0.0.0 # open browser on http://localhost:3000 and you should see Discourse

Create an admin account with:

bundle exec rake admin:create

If you ever need to recreate your database:

bundle exec rake db:drop db:create db:migrate
bundle exec rake admin:create
RAILS_ENV=test bundle exec rake db:drop db:create db:migrate

Discourse does a lot of stuff async, so it's better to run sidekiq even on development mode:

mailcatcher # open http://localhost:1080 to see the emails, stop with pkill -f mailcatcher
bundle exec sidekiq # open http://localhost:3000/sidekiq to see queues
bundle exec rails server

And happy hacking!