17.1.3. Replication and Binary Logging Options and Variables

The next few sections contain information about mysqld options and server variables that are used in replication and for controlling the binary log. Options and variables for use on replication masters and replication slaves are covered separately, as are options and variables relating to binary logging. A set of quick-reference tables providing basic information about these options and variables is also included (in the next section following this one).

Of particular importance is the --server-id option.

Command-Line Format--server-id=#
Option-File Formatserver-id
Option Sets VariableYes, server_id
Variable Nameserver_id
Variable ScopeGlobal
Dynamic VariableYes
 Permitted Values

This option is common to both master and slave replication servers, and is used in replication to enable master and slave servers to identify themselves uniquely. For additional information, see Section, “Replication Master Options and Variables”, and Section, “Replication Slave Options and Variables”.

On the master and each slave, you must use the --server-id option to establish a unique replication ID in the range from 1 to 232 – 1. “Unique”, means that each ID must be different from every other ID in use by any other replication master or slave. Example: server-id=3.

If you omit --server-id, the default ID is 0, in which case a master refuses connections from all slaves, and a slave refuses to connect to a master. For more information, see Section, “Setting the Replication Slave Configuration”.

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