PowerDNS OpenDBX Backend/Installation
Contents
Compilation
Before performing the steps to compile the PowerDNS server and the OpenDBX backend you have to install the OpenDBX library, the OpenDBX backend you would like to use and its development package, which includes the necessary header.
Apply these steps to the source pdns-x.xx.tar.gz file, if you don't want to use a precompiled package:
* Extract the pdns tar file
* Change into the newly created pdns directory
* Extract the opendbxbackend tar file
* Run "cat <patch> | patch -p1" (if available)
* Type ./configure --help for the available options
* For dynamic modules:
./configure
--prefix=/usr
--with-modules=""
--with-dynmodules="opendbx"
--enable-recursor
* For a static module:
./configure
--prefix=/usr
--with-modules="opendbx"
--with-dynmodules=""
--enable-recursor
* make && make install
Configuration options
There are a few options through the OpenDBX backend can be configured for your environment. Add them to the pdns.conf file located in /etc/powerdns or /usr/local/etc/ (depends on your configuration while compiling):
- opendbx-backend (default "mysql")
- Name of the backend used to connect to the database server. Currently mysql, pgsql, sqlite, sqlite3 and sybase are available.
- opendbx-host-read (default "127.0.0.1")
- One or more host names or IP addresses of the database servers. These hosts will be used for retrieving the records via SELECT queries.
- opendbx-host-write (default "127.0.0.1")
- Same as opendbx-host-read, except for INSERT/UPDATE statements (mostly used by zonetransfers).
- opendbx-port (default "")
- TCP/IP port number where the database server is listening to. Most databases will use their default port if you leave this empty.
- opendbx-database (default "powerdns")
- The database name where all domain and record entries are stored.
- opendbx-username (default "powerdns")
- Name of the user send to the DBMS for authentication.
- opendbx-password (default "")
- Clear text password for authentication in combination with the username.
- opendbx-host (deprecated, default "127.0.0.1")
- Host name or IP address of the database server. This parameter is deprecated in favor of opendbx-host-read and opendbx-host-write.
Example configuration
Configuring PowerDNS is straight forward. You only have to launch the opendbx backend and configure the database connection correctly. The lines below are an example for configuring PowerDNS to connect to a MySQL server:
launch=opendbx opendbx-backend=mysql opendbx-host-read=192.168.1.1 opendbx-host-write=192.168.1.1 opendbx-port=3306 opendbx-database=powerdns opendbx-username=powerdns opendbx-password=secret
Backend specific configuration
MySQL
Supported without changes since OpenDBX 1.0.0
PostgreSQL
Supported without changes since OpenDBX 1.0.0
SQLite and SQLite3
Supported without changes since OpenDBX 1.0.0 but requires to set opendbx-host to the path of the SQLite file (including the trailing slash or backslash, depending on your operating system) and opendbx-database to the name of the file, e.g.
opendbx-host-read = /path/to/file/ opendbx-host-write = /path/to/file/ opendbx-database = powerdns.sqlite
MS SQL Server
Supported by PowerDNS 2.9.20 (with latest patch) and OpenDBX 1.1.4 by using the FreeTDS library. It uses a different scheme for host configuration (requires the name of the host section in the configuration file of the dblib client library) and doesn't support the default statement for starting transactions. Please add the following lines to your pdns.conf:
opendbx-host-read = MSSQL2k opendbx-host-write = MSSQL2k opendbx-sql-transactbegin = BEGIN TRANSACTION
Sybase ASE
Supported by PowerDNS 2.9.20 (with latest patch) and OpenDBX 1.1.5 by using the native Sybase ctlib or the FreeTDS library. It uses a different scheme for host configuration (requires the name of the host section in the configuration file of the ctlib client library) and doesn't support the default statement for starting transactions. Please add the following lines to your pdns.conf:
opendbx-host-read = SYBASE opendbx-host-write = SYBASE opendbx-sql-transactbegin = BEGIN TRANSACTION
Oracle
Supported by PowerDNS 2.9.20 (with latest patch) and OpenDBX 1.1.6. It uses a different syntax for transactions and requires the following additional line in your pdns.conf:
opendbx-sql-transactbegin = SET TRANSACTION NAME 'AXFR'
Database setup
You need one of the DBMS supported by the OpenDBX library for storing your records and domain infomation. Please have a look at the documentation of your DBMS for the task of creating a database and an user.
After that you're almost done. Use the appropriate table definition below to create the tables in the new database after which you can populate your database with dns information with e.g. zone2sql.
Migration
To convert an existing gMySQL Database to an OpenDBX MySQL database, an additional status column is required since patch 2.9.20-3:
ALTER TABLE domains ADD ( status CHAR(1) NOT NULL DEFAULT 'A' )
Adding a foreign key constraint from records.domain_id to domains.id is a good idea too:
ALTER TABLE records ADD CONSTRAINT fk_records_domainid FOREIGN KEY (domain_id) REFERENCES domains (id) ON UPDATE CASCADE ON DELETE CASCADE
You should also recreate your indices for optimal performance. Please have a look in the appropriate file listed in the section above.
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