Posted By: Anonymous
I’m getting the error:
FATAL: Peer authentication failed for user "postgres"
when I try to make postgres work with Rails.
I changed authentication to md5 in pg_hba and tried different things, but none seem to work.
I also tried creating a new user and database as per Rails 3.2, FATAL: Peer authentication failed for user (PG::Error)
But they don’t show up on pgadmin or even when I run
sudo -u postgres psql -l.
Any idea where I’m going wrong?
The problem is still your
pg_hba.conf file (
local all postgres peer
local all postgres md5
* If you can’t find this file, running
locate pg_hba.conf should show you where the file is.
After altering this file, don’t forget to restart your PostgreSQL server. If you’re on Linux, that would be
sudo service postgresql restart.
These are brief descriptions of both options according to the official PostgreSQL docs on authentication methods.
The peer authentication method works by obtaining the client’s
operating system user name from the kernel and using it as the allowed
database user name (with optional user name mapping). This method is
only supported on local connections.
The password-based authentication methods are md5 and password. These
methods operate similarly except for the way that the password is sent
across the connection, namely MD5-hashed and clear-text respectively.
If you are at all concerned about password “sniffing” attacks then md5
is preferred. Plain password should always be avoided if possible.
However, md5 cannot be used with the db_user_namespace feature. If the
connection is protected by SSL encryption then password can be used
safely (though SSL certificate authentication might be a better choice
if one is depending on using SSL).
Sample location for