On a replication master, you must enable binary logging and establish a unique server ID. If this has not already been done, a server restart is required.
Binary logging must be enabled on the
master because the binary log is the basis for replicating
changes from the master to its slaves. If binary logging is not
enabled using the
log-bin option, replication
is not possible.
Each server within a replication group must be configured with a unique server ID. This ID is used to identify individual servers within the group, and must be a positive integer between 1 and (232)−1. How you organize and select the numbers is your choice.
To configure the binary log and server ID options, shut down the
MySQL server and edit the
my.ini file. Within the
[mysqld] section of the configuration file,
server-id options. If these options already
exist, but are commented out, uncomment the options and alter
them according to your needs. For example, to enable binary
logging using a log file name prefix of
mysql-bin, and configure a server ID of 1,
use these lines:
[mysqld] log-bin=mysql-bin server-id=1
After making the changes, restart the server.
If you do not set
(or set it explicitly to its default value of 0), the master
refuses any connections from slaves.
For the greatest possible durability and consistency in a
replication setup using
transactions, you should use
sync_binlog=1 in the master
Ensure that the
variable is not enabled on your replication master. If
networking has been disabled, the slave can not communicate
with the master and replication fails.