MySQL两主配置

双主模式：两台服务器互为主从，任何一台服务器数据变更，都会通过复制应用到另外一方的数据库中。

安装wget依赖

yum install wget -y
下载MysqL5.7.26到data目录

wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.26-linux-glibc2.12-x86_64.tar.gz
解压MysqL

tar -zxvf MysqL-5.7.26-linux-glibc2.12-x86_64.tar.gz
修改 MysqL 文件夹

mv MysqL-5.7.26-linux-glibc2.12-x86_64.tar.gz MysqL-5.7.26
创建MysqL数据存储文件

cd /MysqL-5.7.26

mkdir data

chmod -R 777 /data/MysqL-5.7.26/data/
创建组和用户，并将用户加入组

groupadd MysqL

useradd -g MysqL MysqL

vi /etc/my.cnf

[MysqLd]
bind-address=0.0.0.0
port=3306
log-bin=MysqL-bin
sync-binlog=1
#双主配置
relay_log=MysqL-relay-bin
log_slave_updates=1
auto_increment_offset=1
auto_increment_increment=2
#skip-grant-tables
user=MysqL
basedir=/data/MysqL-5.7.26
datadir=/data/MysqL-5.7.26/data
socket=/tmp/MysqL.sock
log-error=/data/MysqL-5.7.26/data/MysqL.err
pid-file=/data/MysqL-5.7.26/data/MysqL.pid
#character config
character_set_server=utf8mb4
symbolic-links=0
explicit_defaults_for_timestamp=true

修改Master2 my.cnf文件

[MysqLd]
server-id=2
log-bin=MysqL-bin
sync-binlog=1
relay_log=MysqL-relay-bin
log_slave_updates=1
auto_increment_offset=2
auto_increment_increment=2
bind-address=0.0.0.0
port=3306
#skip-grant-tables
user=MysqL
basedir=/data/MysqL-5.7.26
datadir=/data/MysqL-5.7.26/data
socket=/tmp/MysqL.sock
log-error=/data/MysqL-5.7.26/data/MysqL.err
pid-file=/data/MysqL-5.7.26/data/MysqL.pid
log-slave-updates =  1
#character config
character_set_server=utf8mb4
symbolic-links=0
explicit_defaults_for_timestamp=true

进入bin目录，初始化MysqL

cd /data/MysqL-5.7.26/bin

./MysqLd --initialize --user=MysqL --datadir=/data/MysqL-5.7.26/data/ --basedir=/data/MysqL-5.7.26/
查看MysqL初始化密码

cat /data/MysqL-5.7.26/data/MysqL.err
添加软链接，可以在任意目录执行MySQL命令

ln -s /data/MysqL-5.7.26/support-files/MysqL.server /etc/init.d/MysqL

ln -s /data/MysqL-5.7.26/bin/MysqL /usr/bin/MysqL

service MysqL restart
登录 MysqL 修改密码

vi /etc/my.cnf

去掉#skip-grant-tables的注释

MysqL -u root -p

use MysqL

修改密码

update user set authentication_string=password('Pw!123456') where user='root';

|alter user USER() identified by 'Pw!123456';

开启远程访问权限

update user set host ='%' where user ='root';

刷新权限

flush privileges;

重启MysqL

service MysqL restart
将MysqL端口加入防火墙的白名单

firewall-cmd --zone=public --add-port=3306/tcp --permanent

systemctl restart firewalld.service
重启MysqL验证

service MysqL restart

MysqL -u root -p

查看二进制日志是否开启

show global variables like '%log_bin%';

log_bin value 等于ON 说明开启

查看主节点二进制日志列表（以后会有多个）

show master logs;

查看主节点的serverid

show global variables like '%server%';
在MysqL中创建从服务器的用户和权限

GRANT REPLICATION SLAVE ON . TO 'root'@'%' IDENTIFIED BY 'abc123';

flush privileges;
查看状态

show master status;

配置双主关系

Maser01
MysqL> stop slave;
MysqL> change master to master_host='192.168.0.103',master_port=3306,master_user='root',master_password='Pw!123456',master_log_file='MysqL-bin.000003',master_log_pos=403;



master02
MysqL> stop slave;
MysqL> change master to master_host='192.168.0.102',master_port=3306,master_user='root',master_password='123456',master_log_file='MysqL-bin.000004',master_log_pos=403;

#查看状态
MysqL> start slave;
MysqL> show slave status \G;

注意没报错并且Slave_IO_Running和Slave_sql_Running都为YES，则配置成功。

设置开机自启动

查看自启动的服务

chkconfig --list
设置自启动

cd /etc/rc.d/init.d

cp /data/MysqL-5.7.26/support-files/MysqL.server /etc/rc.d/init.d/

赋予可执行权限：chmod +x /etc/init.d/MysqL.server

添加为服务: chkconfig --add MysqL.server

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