Installing Discourse on Ubuntu

Setting Up PostgreSQL

PostgreSQL is an integral part of Discourse, so naturally it is important that we set up the PostgreSQL server properly.

    Install the server:

            sudo apt-get install postgresql postgresql-contrib postgresql-server-dev-9.1

    Open a terminal and run the following command:
           sudo -u postgres psql postgres

   We now have a PostgreSQL interactive prompt, which we can use to create the user and database we will need later.
   Enter the following command at the prompt:
           CREATE USER xxx WITH PASSWORD '123' SUPERUSER;
Replace xxx with your username. If you're not sure what your username is, run the appropriately named whoami command. The password is not important and can be set to any value.

Now create the database that Discourse will later use with the following command:

CREATE DATABASE xxx;

Replace xxx with your username. This creates the database and assigns the discourse user we previously created as the owner.



Setting Up Redis




Redis acts as a key/value store, providing a simple but extremely efficient means of caching data.



Install Redis:



sudo apt-get install redis-server



Setting Up Ruby



Discourse is written in Ruby, so it only follows that we need the interpreter to run the application.

In addition to the ruby package, we also need bundler. Note that we use a specific version of Ruby:





sudo apt-get install ruby1.9.3 bundler



Setting Up Discourse

Navigate to a directory of your choice where the Discourse source 

code will be installed. For the sake of this example, we will use ~/discourse.

Clone the Discourse Git repository:

      sudo apt-get install git

             git clone git://github.com/discourse/discourse.git

Copy the configuration templates to their appropriate locations:
             cp config/database.yml.development-sample config/database.yml
             cp config/redis.yml.sample config/redis.yml

Open the config/database.yml file in a text editor of your choice. Edit the contents to match what you see below:

development:
  adapter: postgresql
  database: xxx
  pool: 5
  timeout: 5000
  host_names:
    - localhost

Again, replace xxx with your username.



Open the config/redis.yml file and edit the contents to match what you see below:



development:
  uri: redis://localhost:6379
  host: localhost
  port: 6379
  password:
  db: 0
  cache_db: 2



Next run the following command to install all required gems:



bundle install
rake db:migrate



Launch the server with the following command:
bundle exec rails server


If everything installed without error, then you should be able to open 
the following link in your browser to view your new installation:

http://localhost:3000



For more detail
use following links


http://www.rosehosting.com/blog/how-to-install-and-setup-discourse-on-an-ubuntu-12-04-vps

https://meta.discourse.org/t/beginners-guide-to-install-discourse-on-ubuntu-for-development/14727