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This record only allows the postgres user account to connect to any database from the single network host address of 192168010 The postgres user account will not be allowed to log in from any other network address Finally, take a look at this example:
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This record allows any client on the local 19216810 subnetwork to connect as any user to any database using plain-text authentication Of course, once the client connection is made, PostgreSQL database restrictions still apply for database access (discussed in 4) Again, be very careful when using the password authentication method, as it can be susceptible to network snooping
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The pg_identconf File
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As discussed earlier in the The pg_hbaconf file section, the pg_identconf configuration file provides a method for you to map remote client user accounts to PostgreSQL user accounts The format of records in this configuration file is
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The map-name field contains the name associated with the pg_hbaconf ident field option This allows you to set up different maps if you have users accessing the system using the same userids from different remote host systems The ident-name field contains the userid that is passed from the client system to PostgreSQL in the connection The account is mapped to the specific PostgreSQL user account specified in the record As an example, assume you have the following record in your pg_hbaconf file:
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host all all 192168010/32 ident testhost
All users from the host 192168010 will have access to all PostgreSQL databases User accounts from this host are mapped to PostgreSQL user accounts using the testhost ident mapping Now, we need to look at how the pg_identconf file maps these user accounts Assume you have the following records in your pg_indentconf file:
testhost testhost testhost rich mike dan richard michael daniel
When the user rich connects from the host 192168010, he is automatically mapped to the richard PostgreSQL user account on the system The same process happens for users mike and dan If any user other than rich, mike, or dan attempts to connect from this host, they will be denied access to the PostgreSQL system
PROGRAMS
All of the PostgreSQL main program files are located in the bin directory While most Unix administrators live and die by these utilities, Windows administrators will want to use the graphical tools available in the pgAdmin III application (discussed next in 4) However, even in Windows it is sometimes easier to just use a simple command-line program than to start up a full Windows program just to perform a single function To run the PostgreSQL utilities, you either need to be in the PostgreSQL bin directory or set your Windows PATH environment variable to include this directory The easiest method to run these programs is to use the Command Prompt item in the PostgreSQL menu (Start | Programs | PostgreSQL 82 | Command Prompt) This creates a command prompt window that defaults to the bin directory This section describes some of the more popular PostgreSQL command-line utilities that are available, and demonstrates how to use them
PostgreSQL Server Commands
PostgreSQL provides several server commands that are used to perform specific system functions directly on the PostgreSQL server These commands are stand-alone programs, interacting directly with the PostgreSQL server Obviously, for these commands to work, the PostgreSQL server must be running
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pg_config
The pg_config program provides a quick way to see the current configuration values on the running PostgreSQL system These are not the configuration values that are defined in the three configuration files shown earlier Instead, these are configuration values that were used to compile and install the PostgreSQL package
pg_ctl
The pg_ctl program is used to control the PostgreSQL system It is used to stop, start, or reload the configuration files for PostgreSQL To perform one of these functions, though, you must specify the database cluster area used by PostgreSQL using the -D commandline option:
C:\>pg_ctl stop -D "c:\Program Files\PostgreSQL\82\data" waiting for postmaster to shut down done postmaster stopped C:\>
Notice that if the database cluster pathname includes spaces, you must enclose the pathname with double quotes To start the database, you must either be logged in as a user account without administrator privileges or use the Windows runas command to run as another user:
C:\>runas /user:postgres "pg_ctl start -D \"c:\Program Files\PostgreSQL \82\data\"" Enter the password for postgres: Attempting to start pg_ctl start -D "c:\Program Files\PostgreSQL\82\data" as user "EZEKIEL\postgres" C:\>
If you use the runas command to run pg_ctl, the command line gets even more complicated Since the runas command line includes spaces, you must enclose the entire command in double quotes However, the pg_ctl command also requires double quotes As you can see in the preceding code, the solution is to use the backslash character (\) to escape out the double quotes required for the pg_ctl command
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