20.3 Connecting to a PostgreSQL Database with an ODBC Driver

This documentation shows how to set up and configure Moab to connect to a PostgreSQL database using the ODBC driver. This document assumes the necessary ODBC drivers have already been installed and configured.

To set up and configure Moab to connect to a PostgreSQL database using the ODBC driver, do the following:

Note This solution has been tested and works with these file versions:
  • odbc-postgresql - 1:08.03.0200-1.2
  • unixodbc - 2.2.14

For a Debian-based system, unixodbc-dev is required, but it might not be required for Red Hat flavors (such as CentOS and RHEL).

  1. Configure the PostgreSQL and ODBC driver. The /etc/odbcinst.ini file should contain content similar to what follows:

    Description = PostgreSQL ODBC driver
    Driver = /usr/lib/odbc/psqlodbca.so
    Setup = /usr/lib/odbc/libodbcpsqlS.so
    Debug = 0
    CommLog = 1
    UsageCount = 2
  2. Configure Moab to use the PostgreSQL ODBC driver. Moab uses an ODBC datastore file to connect to PostgreSQL using ODBC. This file must be located in the Moab home directory (/opt/moab by default) and be named dsninfo.dsn, which is used by Moab. If the following content, which follows the standard ODBC driver file syntax, is not already included in the /etc/odbc.ini file, make sure that you include it. Also, include the same content in the dsninfo.dsn file.

    Driver = PostgreSQL
    Description = PostgreSQL Data Source
    Servername = localhost
    Port = 5432
    Protocol = 8.4
    UserName = postgres
    Password = moab
    Database = Moab
    Note The user should have read/write privileges on the Moab database.
  3. The preceding example file tells ODBC to use the PostgreSQL driver, postgres user, moab password, and to connect to PostgreSQL running on the localhost on port 5432. ODBC uses this information and connects to the database called Moab.

  4. Test the ODBC to PostgreSQL connection by running the isql command, which reads the /etc/odbc.ini file:

    $ isql -v ODBC
    | Connected! |
    | |
    | sql-statement |
    | help [tablename] |
    | quit |
    | |
    SQL> show tables;
    | Tables_in_Moab |
    | EventType |
    | Events |
    | GeneralStats |
    | GenericMetrics |
    | Moab |
    | NodeStats |
    | NodeStatsGenericResources |
    | ObjectType |
    | mcheckpoint |
    SQLRowCount returns 10
    10 rows fetched

    If you encounter any errors using the isql command, then there were problems setting up the ODBC to PostgreSQL connection.

  5. Create the database in PostgreSQL using the moab-db-postgresql.sh setup script contained in the contrib/sql directory at the root of the binary.
    • Run the script and provide the DB username that will attach to the Moab database (you must supply a DB username or the script will exit). The default admin user is postgres, but you can make a new user at this time:
      > ./moab-db-postgresql.sh postgres
      Create db user "postgres" in postgreSQL? (y/n)>
    • The script asks if you want to create the DB user you specified in postgreSQL. If the DB user already exists, answer 'n'. Otherwise, the DB user is created and it asks for the new user's password.
    • The script then creates the database "Moab".
    • Finally, as the DB user you provided, the script imports the DB schema from moab-db-postgresql-create.sql into the Moab database.
  6. Download and install the ODBC version of Moab. Install and configure Moab as normal but add the following in the Moab configuration file (moab.cfg):

    USEDATABASE             ODBC
    # Turn on stat profiling
  7. With the ODBC driver configured, the database created, and Moab configured to use the database, start Moab for it to begin storing information in the created database.
    Note> moabd is a safe and recommended method of starting Moab if things are not installed in their default locations.

See Also

Copyright © 2012 Adaptive Computing Enterprises, Inc.®