4 MySQL 5.7 高可用
MySQL 5.7主从复制https://dev.mysql.com/doc/refman/5.7/en/replication-gtids-howto.html
GTID(GlobalTransaction> 设置gtid模式，在my.cnf里面的mysqld选项卡里面设置，设置完后，重启mysql服务生效：
gtid_mode=ON
log-slave-updates=ON
enforce-gtid-consistency=ON
mysql> change master to
master_host=‘主库IP',
master_port=主库端口,
master_user='repl',
master_password=‘repl密码',
master_auto_position=1;
mysql> start slave;
PS：其中这里有差别，以前非gtid的是用master_log_file='mysql-bin.000009',master_log_pos=154;而gtid就采用了master_auto_positon=1;来自动同步主库的binlog了。
查看从库复制状态，是双YES，而且Seconds_Behind_Master: 0：
Tell the slave to use the master with GTID based transactions as the replication data source, and to use GTID-based auto-positioning rather than file-based positioning. Issue a CHANGE MASTER TO statement on the slave, including the MASTER_AUTO_POSITION option in the statement to tell the slave that the master's transactions are> 查看备机信息
1.主库show slave hosts;
[*]SELECT * FROM information_schema.PROCESSLIST WHERE COMMAND = 'Binlog Dump'; 查看同步状态
1.Show slave status\G
[*]SELECT SERVICE_STATE FROM performance_schema.replication_connection_status;
搭建级联备库
[*]需设置log_slave_updates=1，使备库生成binlog
[*]备份数据库并通过备份建立新数据库
[*]新数据库与备库同步
[*] 新数据库改为与主库同步
reset slave;
change master to
master_host=‘主库IP',
master_port=主库端口,
master_user='repl',
master_password=‘repl密码',
master_auto_position=1;
[*]su - mysql 2.登录默认(3306)端口的实例
source .profile
mysql –uroot –p –h127.0.0.1 –P3306
3.登录3307端口的实例
source .p3307
mysql –uroot –p –h127.0.0.1 –P3307
知识点整理：
1、.mysql_history文件记录mysql用户执行的命令，存在安全隐患，需要进行软连接处理。lns -l /dev/null $HOME/.mysql_history
2、mysql 如何搭建半同步和异步备库。
3、mysql环境安装。注意修改/relay_log文件夹的属主，VIP配置。
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