By default, PostgreSQL only allow connections from the same machine the server
is installed (
localhost). The reason for this is security: if all connections
were allowed, anyone connected in the same network (like wi-fi) would have
access to your databases (if they know the password, of course).
But allowing external access is necessary when you are building applications that will access any database, or for debugging reasons. To do so, follow the following steps:
Find pg_hba.conf and postgresql.conf files and backup them
On Windows, you will probably find them at
C:\Program Files\PostgreSQL\9.4\data. On Ubuntu, search for
/etc/postgresql/9.3/main. If you can’t find them, a quick search on Google
should help. Backup both files.
Edit the files
postgresql.conf file and search for the line containing:
# listen_addresses = 'localhost'
Uncomment the line and change
listen_addresses = '*'
pg_hba.conf file and add the following to the end of the file:
host all all samenet md5
Restart the PostgreSQL server service
On Ubuntu, just run:
sudo service postgresql restart
On Windows, open “services” from the control panel, search for the PostgreSQL service, and restart it.
Make sure the user you intent to use have a password
When accessing a local PostgreSQL instance in Linux, a password usually isn’t
necessary: you can login with you operating sistem user account.
But since we choose
md5 as login method, you will need to have a user with a
password to remotely access the database. You can either crete a new user, or
create a password for an existing user:
CREATE USER myuser WITH PASSWORD 'mypassword';
ALTER USER myuser WITH PASSWORD 'mypassword';
Make sure the user is allowed to login
To allow to user to login, run the following command:
ALTER USER myuser WITH LOGIN;
For more information about permissions in PostgreSQL see this article.
Test the connection
The easier way to test the connection is throught PgAdmin. Just click on “Add a connection to a server” button, type the IP, user and password, and try to connect.