# phpman > man > user_clusters(5)

[USER_CLUSTERS(5)](https://www.chedong.com/phpMan.php/man/USERCLUSTERS/5/markdown)                  Debian PostgreSQL infrastructure                  [USER_CLUSTERS(5)](https://www.chedong.com/phpMan.php/man/USERCLUSTERS/5/markdown)



## NAME
       user_clusters - File linking users to PostgreSQL clusters


## DESCRIPTION
       The  file  **/etc/postgresql-common/user**___**clusters**  maps  users against the database clusters to
       which they will connect by default. However,  every  user  can  override  these  settings  in
       **~/.postgresqlrc**.

       When  scanning this file, the first matching line will be used.  It is a good idea to provide
       a default explicitly, with a final line where both user and group are set to *****.

       If there is no default, the implicit default is to connect to the cluster listening  on  port
       5432 and to the database matching the user's login name.


## FORMAT
       Comments  are  introduced  by the character **#**.  Comments may follow data on a line; the first
       comment character terminates the data. Leading whitespace and blank lines are ignored.

       Each uncommented, non-blank line must describe a user, group or the default (where both  user
       and group are set to *****).

       Fields must be given in the following order, separated by white space:


       **USER**   The  login  id  of  the  Unix user to whom this line applies. The wildcard character *****
              means any user.

       **GROUP**  The group name of the Unix group to which this line applies. The wildcard character  *****
              means any group.

       **VERSION**
              The major PostgreSQL version of the cluster to connect to.

       **CLUSTER**
              The  name of a cluster to connect to. A remote cluster is specified with _host_:_port_. If
              port is empty, it defaults to 5432.

       **DATABASE**
              Within the cluster, the database to which the user will connect by default if he  does
              not  specify  a database on the command line.  If this is *****, the default database will
              be the one named by the user's login id.


## NOTES
       Since the first matching line is used, the default line must come last.

## SEE ALSO
       **pg**___**[wrapper**(1)](https://www.chedong.com/phpMan.php/man/wrapper/1/markdown), [**postgresqlrc**(5)](https://www.chedong.com/phpMan.php/man/postgresqlrc/5/markdown)



Debian                                      Feburary 2005                           [USER_CLUSTERS(5)](https://www.chedong.com/phpMan.php/man/USERCLUSTERS/5/markdown)