4-mysql_configuration_primary

[mysqld]
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
datadir         = /var/lib/mysql
log-error       = /var/log/mysql/error.log
symbolic-links=0
server-id = 1
log_bin = /var/log/mysql/mysql-bin.log