MySQL多主一从同步
实验准备：主机A和主机B作为主，其IP地址分别为192.168.131.129和192.168.131.130，主机C作为从服务器，在从服务器上面配置MySQL多实例，其IP地址为192.168.131.136，三台服务器均关闭防火墙和SELINUX，MySQL版本为5.6.26，为通用二进制包
1.主机A和主机B主服务器MySQL通用二进制包安装和初始化
# tar xf mysql-5.6.26-linux-glibc2.5-x86_64.tar.gz
# mv mysql-5.6.26-linux-glibc2.5-x86_64 /usr/local/mysql
# useradd -M -s /sbin/nologin mysql
# chown -R root:root /usr/local/mysql/*
# chown -R mysql:mysql /usr/local/mysql/data/
# yum -y install libaio
# cd /usr/local/mysql/scripts/
# ./mysql_install_db --datadir=/usr/local/mysql/data/ --user=mysql --basedir=/usr/local/mysql/
# cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld
# echo 'export PATH=$PATH:/usr/local/mysql/bin' >>/etc/profile
# source /etc/profile
# vim /etc/my.cnf
[mysqld]
datadir=/usr/local/mysql/data
socket=/tmp/mysql.sock
user=mysql
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
# service mysqld start
#chkconfig mysqld on
# ss -tunlp | grep 3306
# mysqladmin -uroot password '123456' #设置数据库密码
2、主机A和主机B配置
①主机A
# vim /etc/my.cnf
server-id=129
port=3306
log-bin=mysql-bin
log-bin-index=mysql-bin.index
max-binlog-size=100M
# service mysqld restart
# mysql -uroot –p
mysql> GRANT REPLICATION SLAVE ON *.* TO 'wdd'@'192.168.131.136' IDENTIFIED BY '123456';
mysql> SHOW MASTER STATUS;
②主机B
# vim /etc/my.cnf
server-id=130
port=3306
log-bin=mysql-bin
log-bin-index= mysql-bin.index
max-binlog-size=100M
# service mysqld restart
# mysql -u root –p
mysql> GRANT REPLICATION SLAVE ON *.* TO 'wdd'@'192.168.131.136' IDENTIFIED BY '123456';
mysql> SHOW MASTER STATUS;
3、主机c从服务器安装MySQL多实例
# yum -y install libaio
# tar xf mysql-5.6.26-linux-glibc2.5-x86_64.tar.gz
# mv mysql-5.6.26-linux-glibc2.5-x86_64 /usr/local/mysql
# useradd -M -s /sbin/nologin mysql
# mkdir /data/{3306,3307} –pv
# chown -R mysql:mysql /data/
#vim /etc/my.cnf
[mysqld_multi]
mysqld=/usr/local/mysql/bin/mysqld_safe
mysqladmin=/usr/local/mysql/bin/mysqladmin
#user=mysql
#password=123456
log=/data/multi.log
[mysqld129]
port=3306
pid-file=/data/3306/mysql.pid
datadir=/data/3306/data
socket=/data/3306/mysql.sock
server-id=136
user=mysql
[mysqld130]
port=3307
pid-file=/data/3307/mysql.pid
datadir=/data/3307/data
socket=/data/3307/mysql.sock
server-id=136
user=mysql
1.# /usr/local/mysql/scripts/mysql_install_db --user=mysql --datadir=/data/3306/data --basedir=/usr/local/mysql/
2.# /usr/local/mysql/scripts/mysql_install_db --user=mysql --datadir=/data/3307/data --basedir=/usr/local/mysql/
3.# mysqld_multi --defaults-file=/etc/my.cnf start 129
# mysqld_multi --defaults-file=/etc/my.cnf start 130
4.# mysqld_multi --defaults-extra-file=/etc/my.cnf report
5.# ss -tunlp | grep 330
注：为了安全应该给MySQL实例设置密码，命令如下
# mysqladmin -uroot -S /data/3306/mysql.sock password '123456'
# mysqladmin -uroot -S /data/3307/mysql.sock password '123456'
4.主机c多实例试验操作
①# mysql -uroot -S /data/3306/mysql.sock
mysql> CHANGE MASTER TO
MASTER_HOST='192.168.131.129',
MASTER_USER='wdd',
MASTER_PASSWORD='123456',
MASTER_LOG_FILE='mysql-bin.000004',
MASTER_LOG_POS=120;
mysql> START SLAVE;
mysql>SHOW SLAVE STATUS;
②# mysql -u root -S /data/3307/mysql.sock
mysql> CHANGE MASTER TO
MASTER_HOST='192.168.131.130',
MASTER_USER='wdd',
MASTER_PASSWORD='123456',
MASTER_LOG_FILE='mysql-bin.000003',
MASTER_LOG_POS=331;
mysql> START SLAVE;
mysql>SHOW SLAVE STATUS;
5、测试
①登录主机A
mysql> create database wdd;
mysql> SHOW DATABASES;
②登录主机B
mysql> create database info;
mysql> show databases;
③查看MySQL实例，实例129和130
实例129
# mysql -uroot -S /data/3306/mysql.sock
mysql> START SLAVE;
实例130
# mysql -u root -S /data/3307/mysql.sock
mysql> show databases;
注：MySQL多实例登录时，其实不需要指定端口，也就是说可以省略-p选项，即使使用-p选项，端口也可以随意指定，也就是说可以随便写一个端口号，只要套接字不变，那么登录的还是同一个MySQL实例。