Peer authentication failed for user "postgres" by Sachin Gevariya

ERROR: Peer authentication failed for user "postgres"

Solution:

The problem is in your pg_hba file. 

You can locate it inside /etc/postgresql/9.1/main.

If you are not able to look at inside it then search location with this command. This will help you a lot!!

            locate pg_hba

Then open this file with this command and press i for insert.

            vi pg_hba.conf

If it will give alert like read only file then change permission with this command:

          sudo chmod 666 pg_hba.conf

Then again open file with 

            vi pg_hba.conf

And change this line :

# Database administrative login by Unix domain socket
local   all             postgres                                peer

with this line:

# Database administrative login by Unix domain socket
local   all             postgres                                md5




If this not work then use this for trust:

# Database administrative login by Unix domain socket
local   all             postgres                                trust
 
then restart postgresql with this command:

sudo service postgresql restart


And its working fine!!! Have a fun!!!