注意：最好不要用innodedb来同步数据库，要用databus来同步数据库，数据量大要用上mycat中间件
Mysql主主同步环境部署:
centos 7.4
三台云主机：
mysql1 ：10.1.1.142
mysql2 ：10.1.1.106
nginx： 10.1.1.152 外网地址：114.115.174.210
两台都安装mysql
1 . 安装新版mysql前，需将系统自带的mariadb-lib卸载
[root@slave mytmp]# rpm -qa|grep mariadb
mariadb-libs-5.5.44-2.el7.centos.x86_64
[root@slave mytmp]# rpm -e --nodeps mariadb-libs-5.5.44-2.el7.centos.x86_64
2 . 解压安装mysql
mysql官方网站：http://www.mysql.com
下载 tar -zxf mysql-5.7.16-1.el7.x86_64.rpm-bundle.tar
[root@slave mytmp]# tar -zxf mysql-5.7.16-1.el7.x86_64.rpm-bundle.tar
[root@slave mytmp]# ls
mysql-5.7.16-1.el7.x86_64.rpm-bundle.tar mysql-community-libs-5.7.16-1.el7.x86_64.rpm
mysql-community-client-5.7.16-1.el7.x86_64.rpm mysql-community-libs-compat-5.7.16-1.el7.x86_64.rpm
mysql-community-common-5.7.16-1.el7.x86_64.rpm mysql-community-minimal-debuginfo-5.7.16-1.el7.x86_64.rpm
mysql-community-devel-5.7.16-1.el7.x86_64.rpm mysql-community-server-5.7.16-1.el7.x86_64.rpm
mysql-community-embedded-5.7.16-1.el7.x86_64.rpm mysql-community-server-minimal-5.7.16-1.el7.x86_64.rpm
mysql-community-embedded-compat-5.7.16-1.el7.x86_64.rpm mysql-community-test-5.7.16-1.el7.x86_64.rpm
mysql-community-embedded-devel-5.7.16-1.el7.x86_64.rpm
使用rpm -ivh命令依次进行安装
rpm -ivh mysql-community-common-5.7.16-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.16-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-5.7.16-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-5.7.16-1.el7.x86_64.rpm
3 . 登录到mysql，更改root用户的密码
通过 cat ~/.mysql_secret 命令可以查看初始密码
[root@slave mytmp]# mysql -uroot -p
Enter password:
mysql> set password=password('1234');
4 . 创建用户，及作权限分配
mysql> CREATE USER 'zz'@'%' IDENTIFIED BY '1234';
mysql> GRANT ALL PRIVILEGES ON *.* TO 'zz'@'%';
mysql> FULSH PRIVILEGES;
5 . 远程登陆授权
mysql> grant all privileges on *.* to 'root'@'%' identified by 'j0!uN@Da12tA&*ba3S&e';
mysql> flush privileges;
6 . 设置mysql开机启动
开机启动
systemctl enable mysqld.service
mysql双主模式配置：
要实现互为主从，就必须 mster1-->master2设置主从同步 同时 master2--->master1 也设置主从同步
四、Mysql主主同步环境部署
---------mysql1服务器操作记录----------
在my.cnf文件的[mysqld]配置区域添加下面内容：
[root@master1 ~]# vim /usr/local/mysql/my.cnf
server-id = 1
log-bin = mysql-bin
sync_binlog = 1
binlog_checksum = none
binlog_format = mixed
auto-increment-increment = 2
auto-increment-offset = 1
slave-skip-errors = all
[root@master1 ~]# /etc/init.d/mysql restart
Shutting down MySQL. SUCCESS!
Starting MySQL.. SUCCESS!
创建一个复制用户
出了小问题，由于之前root用户的密码设置过于简单在创建复制用户时报如下错误
mysql> grant replication slave on *.* to 'root'@'10.1.1.%' identified by 'j0!uN@Da12tA&*ba3S&e';
mysql> alter user 'root'@'localhost' identified by 'j0!uN@Da12tA&*ba3S&e';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> grant replication slave on *.* to 'root'@'10.1.1.%' identified by 'j0!uN@Da12tA&*ba3S&e';
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
锁表，待同步配置完成在解锁
mysql> flush tables with read lock;
Query OK, 0 rows affected (0.00 sec)
查看当前的binlog以及数据所在位置
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000006 | 996 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
-------master2服务器操作记录-------
在my.cnf文件的[mysqld]配置区域添加下面内容：
[root@master2 ~]# vim /usr/local/mysql/my.cnf
server-id = 2
log-bin = mysql-bin
sync_binlog = 1
binlog_checksum = none
binlog_format = mixed
auto-increment-increment = 2
auto-increment-offset = 2
slave-skip-errors = all
[root@master2 ~]# /etc/init.d/mysql restart
Shutting down MySQL.. SUCCESS!
Starting MySQL.. SUCCESS!
mysql> grant replication slave on *.* to repl@'10.0.0.%' identified by '1qaz@WSX';
Query OK, 0 rows affected, 1 warning (0.01 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
? mysql> flush tables with read lock;
? Query OK, 0 rows affected (0.00 sec)
查看 master情况
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 150 | | | |
+------------------+----------+--------------+------------------+-------------------+
分别开启同步对方
---------------master1服务器做同步操作---------------
mysql> unlock tables; //先解锁，将对方数据同步到自己的数据库中
mysql> stop slave；
mysql> change master to master_host='10.1.1.142',master_user='root',master_password='j0!uN@Da12tA&*ba3S&e',master_log_file='mysql-bin.000002',master_log_pos=150;
Query OK, 0 rows affected, 2 warnings (0.01 sec)
mysql> start slave;
Query OK, 0 rows affected (0.01 sec)
?
查看两个线程状态是否为YES?
mysql> show slave status \G;
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
-------------master2服务器做同步操作---------------
mysql> unlock tables; //先解锁，将对方数据同步到自己的数据库中
mysql> slave stop；
mysql> change master to master_host='10.1.1.106',master_user='root',master_password='j0!uN@Da12tA&*ba3S&e',master_log_file='mysql-bin.000002',master_log_pos=150;
Query OK, 0 rows affected, 2 warnings (0.06 sec)
mysql> start slave;
Query OK, 0 rows affected (0.01 sec)
mysql> show slave status \G;
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 996
Relay_Log_File: master2-relay-bin.000002
Relay_Log_Pos: 312
Relay_Master_Log_File: mysql-bin.000006
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
以上表明双方已经实现了mysql主主同步。
在master1数据库上写入新数据
mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)
mysql> create database test;
Query OK, 1 row affected (0.01 sec)
mysql> grant all privileges on test.* TO 'root'@'%' identified by 'jenkins@123' with grant option;
Query OK, 0 rows affected, 1 warning (0.01 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> use test;
Database changed
mysql> create table if not exists kaifa ( id int(10) PRIMARY KEY AUTO_INCREMENT, name varchar(50) NOT NULL);
Query OK, 0 rows affected (0.04 sec)
mysql> insert into kaifa values(2,'join');
Query OK, 1 row affected (0.00 sec)
mysql> insert into kaifa values(1,'bob');
Query OK, 1 row affected (0.00 sec)
mysql> select * from kaifa;
+----+-----------+
| id | name |
+----+-----------+
| 1 | bob |
| 2 | join |
+----+-----------+
2 rows in set (0.00 sec)
然后在master2数据库上查看，发现数据已经同步过来了!
mysql> select * from test.kaifa;
+----+-----------+
| id | name |
+----+-----------+
| 1 | bob |
| 2 | join |
+----+-----------+
2 rows in set (0.00 sec)
2）在master2数据库上写入新数据
mysql> create database ceshi;
Query OK, 1 row affected (0.00 sec)
mysql> insert into test.kaifa values(3,'nginx'),(4,'hadoop');
Query OK, 2 rows affected (0.00 sec)
Records: 2 Duplicates: 0 Warnings: 0
然后在master1数据库上查看，发现数据也已经同步过来了!
mysql> show databases;+--------------------+
| Database |
+--------------------+
| information_schema |
| ceshi |
| test |
| mysql |
| performance_schema |
| test |
+--------------------+6 rows in set (0.00 sec)
mysql> select * from test.kaifa;
+----+-----------+
| id | name |
+----+-----------+
| 1 | bob |
| 2 | join |
| 3 | kaifa |
| 4 | kaifa |
+----+-----------+
4 rows in set (0.00 sec)
至此，Mysql主主同步环境已经实现。
nginx搭建;
1.在两台数据库添加权限
GRANT ALL ON *.* TO 'root'@'10.1.1.152.%' IDENTIFIED BY 'j0!uN@Da12tA&*ba3S&e';
FLUSH PRIVILEGES;
2.
[root@ecs-01 ~]# wget http://nginx.org/download/nginx-1.9.9.tar.gz
[root@ecs-01 ~]# tar xf nginx-1.9.9.tar.gz
[root@ecs-01 ~]# cd nginx-1.9.9
[root@ecs-01 nginx-1.9.9]# ./configure --prefix=/usr/local/nginx --with-stream ----with-http_stub_status_module --with-http_ssl_module
[root@ecs-01 nginx-1.9.9]# make
[root@ecs-01 nginx-1.9.9]# make install
--with-stream ---支持TCP的意思
[root@ecs-01 conf]# vi /usr/local/nginx/conf/nginx.conf
加入类似于http一样的模块：
stream {
upstream mysql {
#hash $remote_addr consistent;
server 10.1.1.124:3306 weight=5;
server 10.1.1.204:3306 weight=5;
}
server {
listen 3306;
proxy_connect_timeout 1s;
proxy_timeout 3s;
proxy_pass mysql;
}
}
/usr/local/nginx/sbin/nginx 启动
/usr/local/nginx/sbin/nginx -s reload 重启
测试：
在192.168.43.75 这台上远程连接nginx服务器
mysql -uroot -pj0!uN@Da12tA&*ba3S&e -h 192.168.88 -P 7306
