In addition to the postgresql.conf
file already mentioned, PostgreSQL uses two other manually-edited configuration files, which control client authentication (their use is discussed in Chapter 20). By default, all three configuration files are stored in the database cluster's data directory. The parameters described in this section allow the configuration files to be placed elsewhere. (Doing so can ease administration. In particular it is often easier to ensure that the configuration files are properly backed-up when they are kept separate.)
-
data_directory
(string
) -
Specifies the directory to use for data storage. This parameter can only be set at server start.
-
config_file
(string
) -
Specifies the main server configuration file (customarily called
postgresql.conf
). This parameter can only be set on thepostgres
command line. -
hba_file
(string
) -
Specifies the configuration file for host-based authentication (customarily called
pg_hba.conf
). This parameter can only be set at server start. -
ident_file
(string
) -
Specifies the configuration file for Section 20.2 user name mapping (customarily called
pg_ident.conf
). This parameter can only be set at server start. -
external_pid_file
(string
) -
Specifies the name of an additional process-ID (PID) file that the server should create for use by server administration programs. This parameter can only be set at server start.
In a default installation, none of the above parameters are set explicitly. Instead, the data directory is specified by the -D
command-line option or the PGDATA
environment variable, and the configuration files are all found within the data directory.
If you wish to keep the configuration files elsewhere than the data directory, the postgres
-D
command-line option or PGDATA
environment variable must point to the directory containing the configuration files, and the data_directory
parameter must be set in postgresql.conf
(or on the command line) to show where the data directory is actually located. Notice that data_directory
overrides -D
and PGDATA
for the location of the data directory, but not for the location of the configuration files.
If you wish, you can specify the configuration file names and locations individually using the parameters config_file
, hba_file
and/or ident_file
. config_file
can only be specified on the postgres
command line, but the others can be set within the main configuration file. If all three parameters plus data_directory
are explicitly set, then it is not necessary to specify -D
or PGDATA
.
When setting any of these parameters, a relative path will be interpreted with respect to the directory in which postgres
is started.
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