Install PostgreSQL on Ubuntu for Rails developers

These instructions worked for Ubuntu 12-14.

Check the language in the system:

env | grep LC_

It should be “en_US.UTF-8”, if not you can configure in “System Setting > Language Support”.
Installing DDBB and libpq-dev to compile rails gem when bundling, with following command:

sudo apt-get install postgresql libpq-dev

To gain access from the server it-self, In /etc/postgresql/9.3/main/postgresql.conf, uncomment the following line:

listen_addresses = 'localhost'

To have access from rails app, modify the following line in /etc/postgresql/9.1/main/pg_hba.conf:

# "local" is for Unix domain socket connections only
local   all             all                                     md5

Restart the service:

sudo service postgresql restart

You will need to add a role:

sudo -u postgres psql
create role pg_user with createdb login password 'pg_user';

Be sure that your Gemfile includes: gem ‘pg’
Create your database.yml for dev and test:

common: &amp;common
  adapter: postgresql
  username: pg_user
  password: pg_user
 
development:
  &lt;

Create and fill the database:

rake db:create
rake db:migrate
rake db:seed

Some Postgre useful commands are:

List of databases: sudo -u postgres psql -l
Check server encoding: sudo -u postgres psql -c “SHOW SERVER_ENCODING”

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