数据库主从配置心得：

master : 192.168.16.247
slave1 : 192.168.16.248

1 修改配置文件 /etc/mysql/my.cnf(如果my.cnf已有该配置项，则相应的进行修改)
	主数据库：
	server-id               = 1
	log-bin                 = mysql-bin
	log-bin-index           = mysql-bin.index
	#log_bin                 = /var/log/mysql/mysql-bin.log
	binlog_do_db            = flyticket_safe
	从数据库：
	server-id               = 2
	master-host             = 192.168.16.247[主数据库IP地址]
	master-user             = newbackup[连接主数据库的用户名]
	master-password         = backup[连接主数据库的密码]
	master-port             = 3306[端口]
	master-connect-retry    = 60
	log-slave-updates
	replicate-do-db         = flyticket_safe[数据库]
	log-bin                 = mysql-bin
	binlog_format           = mixed
	#log_bin                = /var/log/mysql/mysql-bin.log
	expire_logs_days        = 10
	max_binlog_size         = 100M
2 在master机器上分别添加用户和授权，如：在247上执行：
   GRANT REPLICATION SLAVE ON *.* TO ‘newbackup‘@‘192.168.16.248‘ IDENTIFIED BY ‘backup‘;
3 在master上执行：
   flush tables with read lock;
   SHOW MASTER STATUS;
   +------------------+----------+--------------+------------------+
   | File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
   +------------------+----------+--------------+------------------+
   | mysql-bin.000003 |     1049 |              |                  |
   +------------------+----------+--------------+------------------+
   unlock tables;
4 在slave上执行
	change master to MASTER_HOST=‘192.168.16.235‘, MASTER_USER=‘newbackup247‘,MASTER_PASSWORD=‘backup‘,MASTER_LOG_FILE=‘mysql-bin.000001‘,MASTER_LOG_POS=107;

	[mysql-bin.000003 1049 改成主数据库中SHOW MASTER STATUS;的值]

	slave start;
5 配置半同步:[有些不支持]
   主库上安装：
	install plugin rpl_semi_sync_master soname ‘semisync_master.so‘;
   查询是否安装成功：
	SELECT * FROM information_schema.PLUGINS WHERE PLUGIN_NAME=‘rpl_semi_sync_master‘\G
   从库上安装：
	install plugin rpl_semi_sync_slave soname ‘semisync_slave.so‘;
   主库上配置：
	set global rpl_semi_sync_master_enabled=1;
	set global rpl_semi_sync_master_timeout=1000;
   从库上配置：
	set global rpl_semi_sync_slave_enabled=1;

6 查看从数据库上的配置情况
   show slave status \G