PostgreSQL – How to Map a Linux User to Login

linuxpostgresqlpsql

I want to map Linux's root user to Postgres user, like if I enter psql in root user it should go the PostgreSQL cli without asking any authentication.

I tried to add an entry in pg_ident.conf and make the necessary changes in pg_hba.conf, but it didn't work.

psql: FATAL:  role "root" does not exist

Postgresql Version 9.6

pg_ident.conf
# MAPNAME       SYSTEM-USERNAME PG-USERNAME
root                 root            postgres

pg_hba.conf
# TYPE  DATABASE USER   ADDRESS         METHOD
local   all     all                     peer map=root 
host    all     all     127.0.0.1/32    ident map=root

Any suggestions to achieve this?

I need to map multiple Linux users. The above one is for who all are using root user.

Best Answer

Finally, it comes to end.

The problem is I need to replace the below line.

local   all             postgres                                peer

 to 

local   all             postgres                                peer  map=root

Thats it, no more changes.

Got this from:

This link

Related Solutions

Postgresql – Authentification failure for PostgreSQL server (9.3)

I found a temporary solution to my problem. I edited the pg_hba.conf of the 9.3 server to say trust in the first two active lines. And after restarting (sudo service postgresql restart) I can connect to the server again using pgadmin. The downside is that the server might now not be password protected (I will open a separate question if I encounter any problems with that).

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

    # TYPE  DATABASE        USER            ADDRESS                 METHOD

    # "local" is for Unix domain socket connections only
    local   all             all                                     trust
    # IPv4 local connections:
    host    all             all             127.0.0.1/32            md5
    # IPv6 local connections:
    host    all             all             ::1/128                 md5
    # Allow replication connections from localhost, by a user with the
    # replication privilege.
    #local   replication     postgres                                peer
    #host    replication     postgres        127.0.0.1/32            md5
    #host    replication     postgres        ::1/128                 md5

Postgresql – Connect to PgAdmin III via localhost

The basic misunderstanding: "localhost" is not a local connection. Your "trust" line in pg_hba.conf is not applicable for your connection:

local   all   all   trust

That only applies for connections via Unix-domain socket. Best choice for you is to connect via this route. Per pgAdmin documentation:

The host is the IP address of the machine to contact, or the fully qualified domain name. On Unix based systems, the address field may be left blank to use the default PostgreSQL Unix Domain Socket on the local machine, or be set to an alternate path containing a PostgreSQL socket. If a path is entered, it must begin with a “/”. The port number may also be specified.

Bold emphasis mine.

More about connecting without password in this related answer on SO:
Run batch file with psql command without password

Best Answer

Related Solutions

Postgresql – Authentification failure for PostgreSQL server (9.3)

Postgresql – Connect to PgAdmin III via localhost

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