mysql Module

Jan Janak

Edited by

Daniel-Constantin Mierla

Revision History
Revision $Revision: 5901 $$Date$

Table of Contents

1. Admin Guide
1.1. Overview
1.2. Dependencies
1.2.1. OpenSIPS Modules
1.2.2. External Libraries or Applications
1.3. Exported Parameters
1.3.1. exec_query_threshold (integer)
1.3.2. timeout_interval (integer)
1.3.3. max_db_queries (integer)
1.3.4. max_db_retries (integer)
1.3.5. tls_client_domain (string)
1.4. Exported Functions
1.5. Installation
1.6. Exported Events

List of Examples

1.1. Set exec_query_threshold parameter
1.2. Set timeout_interval parameter
1.3. Set max_db_queries parameter
1.4. Set max_db_retries parameter
1.5. Set the tls_client_domain parameter

Chapter 1. Admin Guide

1.1. Overview

This is a module which provides MySQL connectivity for OpenSIPS. It implements the DB API defined in OpenSIPS.

1.2. Dependencies

1.2.1. OpenSIPS Modules

The following modules must be loaded before this module:

  • If a tls_client_domain is defined, the tls_mgm module will need to be loaded as well.

1.2.2. External Libraries or Applications

The following libraries or applications must be installed before running OpenSIPS with this module loaded:

  • libmysqlclient-dev - the development libraries of mysql-client.

1.3. Exported Parameters

1.3.1. exec_query_threshold (integer)

If queries take longer than 'exec_query_threshold' microseconds, warning messages will be written to logging facility.

Default value is 0 - disabled.

Example 1.1. Set exec_query_threshold parameter

modparam("db_mysql", "exec_query_threshold", 60000)

1.3.2. timeout_interval (integer)

Time interval after which a connection attempt (read or write request) is aborted. The value counts three times, as several retries are done from the driver before it gives up.

The read timeout parameter is ignored on driver versions prior to 5.1.12, 5.0.25 and 4.1.22. The write timeout parameter is ignored on version prior to 5.1.12 and 5.0.25, the 4.1 release don't support it at all.

Default value is 2 (6 sec).

Example 1.2. Set timeout_interval parameter

modparam("db_mysql", "timeout_interval", 2)

1.3.3. max_db_queries (integer)

The maximum number of database queries to be executed. If this parameter is set improperly, it is set to default value.

Default value is 2.

Example 1.3. Set max_db_queries parameter

modparam("db_mysql", "max_db_queries", 2)

1.3.4. max_db_retries (integer)

The maximum number of database connection retries. If this parameter is set improperly, it is set to default value.

Default value is 3.

Example 1.4. Set max_db_retries parameter

modparam("db_mysql", "max_db_retries", 2)

1.3.5. tls_client_domain (string)

Setting this parameter will enable TLS for all MySQL connections established by the module. Refer to the tls_mgm module for additional info regarding TLS client domains.

If using this parameter, you must also ensure that tls_mgm is loaded and properly configured.

Note that if you want to use this feature, the certificate must be provisioned in the configuration file, NOT in the database. In case you are loading TLS certificates from the database, you must at least define the default domain in the configuration script, where is currently the only place you can define it.

Default value is NULL (not set)

Example 1.5. Set the tls_client_domain parameter

modparam("tls_mgm", "client_domain", "1=")
modparam("tls_mgm", "certificate", "1:/etc/pki/tls/certs/opensips.pem")
modparam("tls_mgm", "private_key", "1:/etc/pki/tls/private/opensips.key")
modparam("tls_mgm", "ca_list",     "1:/etc/pki/tls/certs/ca.pem")
modparam("db_mysql", "tls_client_domain", "1=")

1.4. Exported Functions

No function exported to be used from configuration file.

1.5. Installation

Because it dependes on an external library, the mysql module is not compiled and installed by default. You can use one of the next options.

  • - edit the "Makefile" and remove "db_mysql" from "excluded_modules" list. Then follow the standard procedure to install OpenSIPS: "make all; make install".

  • - from command line use: 'make all include_modules="db_mysql"; make install include_modules="db_mysql"'.

1.6. Exported Events


This event is raised when a MySQL connection is lost or recovered.


  • url - the URL of the connection as specified by the db_url parameter.

  • status - connected if the connection recovered, or disconnected if the connection was lost.