一.基本环境
主库1: 10.24.65.30 3306MySQL5.7.14
主库2: 10.24.65.30 3307 mysql 5.7.14
从库：10.24.65.33 3306 mysql 5.7.14
基于gtid复制

二.搭建注意事项
1.每个实例上DB名字不能一样。
2.创建或是复制用户时名字不能一样，如果经常遇到一样的帐号若是为了规范创建的帐
号是一样的，考虑在slave的过滤规则把mysql复制忽略掉。
[stop slave sql_thread;change replication filter replicate_ignore_db=mysql;]

3307启停：
mysqld_safe --defaults-file=/data/mysql/mysql3307/data/my3307.cnf &
mysqladmin shutdown -S /tmp/mysql3307.sock
mysql -S /tmp/mysql3307.sock

三.主库配置
1.master1参数设置
gtid-mode=on
enforce-gtid-consistency=1
skip_slave_start=1
2.master2参数设置
gtid-mode=on
enforce-gtid-consistency=1
skip_slave_start=1
3.复制帐号建立
grant replication slave on *.* torepl@'10.24%'identified by 'replsafe';
flush privileges;
4.slave参数设置
gtid-mode=on
enforce-gtid-consistency=1
skip_slave_start=1
master-info-repository=table
relay-log-info-repository=table
5.slave配置连接主库
change master to
master_host='10.24.65.30',
master_port=3306,
master_user='repl',
master_password='replsafe',
master_auto_position=1 for channel 'master-65303306';

change master to
master_host='10.24.65.30',
master_port=3307,
master_user='repl',
master_password='replsafe',
master_auto_position=1 for channel 'master-65303307';

四.常用命令：
1.开关复制
start slave io_thread|sql_thread for channel 'master-65303306';
stop slave io_thread|sql_thread for channel 'master-65303306'

2.监控复制
show slave status for channel 'master-65303306';

五.校验
master1：
create database mdb1;
use mdb1;
create table t1(id int);

master2:
create database mdb2;
use mdb2;
create table t2(id int);

slave:
(product)root@localhost [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mdb1 |
| mdb2 |
| mysql |
| performance_schema |
| sys |
+--------------------+
6 rows in set (0.00 sec)

(product)root@localhost [(none)]> use mdb1;
Database changed
(product)root@localhost [mdb1]> show tables;
+----------------+
| Tables_in_mdb1 |
+----------------+
| t1 |
+----------------+
1 row in set (0.00 sec)

(product)root@localhost [mdb1]> use mdb2;
Database changed
(product)root@localhost [mdb2]> show tables;
+----------------+
| Tables_in_mdb2 |
+----------------+
| t2 |
+----------------+
1 row in set (0.00 sec)

六.相关问题
1.多源复制处理之一：
binlog+position:
stop slave sql_thread for channel 'master-65303306';
set sql_slave_skip_counter=n;
start slave sql_thread for channel 'master-65303306';

gtid:
stop slave sql_thread for channel 'master-65303306';
set gtid_next='uuid-N';
begin;commit;
set gtid_next='automatic';
start slave sql_thread for channel 'master-65303306';
2.从多源复制处理之二：
Last_IO_Errno: 1236
Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'A slave with the same server_uuid/server_id as this slave has connected to the master;
the first event 'mysql-bin.000181' at 154, the last event read from '/data/mysql/mysql3306/logs/mysql-bin.000181' at 123, the last byte read from '/data/mysql/mysql3306/logs/mysql-bin.000181' at 154.'

解决方法：
a.由于两主库的server-uuid相同，更改其中一个auto.cnf中的server-uuid号
b.并在从库上执行reset slave all清除slave信息
c.重新change master

补充： 1.dump master1 master2 数据文件（master-data=2）注释掉set_gtid——purged 2.scp master1.sql至slave ，reset master 并且导入master1.sql，master_auto=0搭建复制步骤 3.scp master2.sql 至slave ，reset master 并且导入master2.sql，master_auto=0搭建复制步骤4.搭建复制通道
change master to master_host='127.0.0.1',master_user='repluser',master_password='replpass',master_port=3308，MASTER_LOG_FILE='mysql-bin.000005', MASTER_LOG_POS=9460 for channel 'master_3308';

5.检查无误