Mysql主从同步部署

1、创建两台虚拟机

Master:172.10.12.248

Slave:172.10.12.249

2、安装mysql，我这里是通过脚本来安装二进制mysql5.5

#!/bin/bash####Author:lsy########Time:2017/07/25########一键安装Mysql-5.5版本####

####查询mysql用户是否存在####

user=mysqlgroup=mysql#create group if not exists  egrep "^$group" /etc/group >& /dev/nullif [ $? -ne 0 ]then    groupadd $groupfi#create user if not exists  egrep "^$user" /etc/passwd >& /dev/nullif [ $? -ne 0 ]then    useradd -g $group $userfi####安装依赖####yum -y install autoconf libaio*####源码包存放路径####if [ -d /tools ]then    echo "Dir already exists"else    echo "Dir don't exists"    mkdir /toolsficd /tools####下载Mysql源码包#####if [ -e /tools/mysql-5.6.36-linux-glibc2.5-x86_64.tar.gz ]#then#       echo "Mysql源码包已存在"#else#       wget http://mirrors.sohu.com/mysql/MySQL-5.6/mysql-5.6.36-linux-glibc2.5-x86_64.tar.gz#fi####二进制安装mysql####m_name="mysql-5.5.22-linux2.6-x86_64"package="${m_name}.tar.gz"M_dir=`ls -l /usr/local |egrep  "^d" |awk '{print $9}' |egrep "^mysql"`if [ $? -eq 0 ]then        echo "Mysql already exists"else        tar xf $package -C /usr/local        cd /usr/local        mv $m_name mysql        cd mysql        chown -R mysql .        chgrp -R mysql .        #mkdir -p /data/mydb        #chown -R mysql:mysql /data/mydb        scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data        cp support-files/mysql.server /etc/init.d/mysqldficd /etc/if [ -e /etc/my.cnf ]then    echo "File already exists"        > /etc/my.cnf        cat >> /etc/my.cnf  << EOF[mysqld]user = mysqlbasedir = /usr/local/mysqldatadir = /usr/local/mysql/dataport = 3306server_id = 1socket = /tmp/mysql.sockEOFelse    echo "File don't exists"        cat >> /etc/my.cnf  << EOF[mysqld]user = mysqlbasedir = /usr/local/mysqldatadir = /usr/local/mysql/dataport = 3306server_id = 1socket = /tmp/mysql.sockEOFfiln -s /usr/local/mysql/bin/* /usr/bin####启动mysql####/etc/init.d/mysqld start####判断mysql是否正常启动####ps -ef |grep mysql |grep -v grep  >/dev/nullif [ $? -eq 0 ]then        echo "Mysqld started successfully"else        echo "Mysqld started failed"fi

3、安装好mysql后，我们需要给mysql设置密码 

#mysqlmysql> USE mysql ;mysql> UPDATE user SET Password = password('123456') WHERE User='root';mysql> flush privileges ;mysql> quit

主库操作

4、创建主从同步的账号

mysql> GRANT REPLICATION SLAVE,RELOAD,SUPER ON *.* TO 'slave'@'172.10.12.249' IDENTIFIED BY '123456';Query OK, 0 rows affected (0.00 sec)REPLICATION SLAVE用于复制型从属服务器（从主服务器中读取二进制日志事件）RELOAD允许使用FLUSHSUPER允许使用CHANGE MASTER, KILL, PURGE MASTER LOGS和SET GLOBAL语句172.10.12.249是从库的地址slave是需要同步的用户名123456为远程同步密码

5、主从同步的账号创建好了，我们就要锁住主数据库的表 

mysql>flush table with read lock;

查询一次master状态 

mysql>show master status;

6、这步我备份了主数据库所有库，用于导入从数据库。 

#mysqldump -uroot -p123456 --all-databases > /work/all.sql

从库操作

在从数据库上有以下几步

1)修改server-id

2)启用中继日志

3)连接主服务器

4)启动复制线程

7、修改从服务器的相关配置文件信息

# vim /etc/my.cnfserver-id = 2relay-log = /usr/local/mysql/log/relay-binMysql使用的相应目录都需要授权为mysql 用户的chown -R mysql:mysql /var/log/mysql/logs/relay-bin重启Mysql服务/etc/init.d/mysqld restart连接到从服务器的Mysql上mysql -uroot -pits123查看从服务器的中继日志是否在启动状态mysql>show global variables like '%relay%'

8、在从库服务器上执行 

mysql> CHANGE MASTER TO MASTER_HOST='172.10.12.248', MASTER_USER='slave', MASTER_PASSWORD='123456', MASTER_PORT=3306, MASTER_LOG_FILE='mysql-bin.000004', MASTER_LOG_POS=330, MASTER_CONNECT_RETRY=10;参数说明MASTER_HOST                主服务器的IPMASTER_USER                主服务器上授权复制的用户名MASTER_PASSWORD            主服务器上授权用名的密码MASTER_PORT                主服务器的Mysql端口MASTER_LOG_FILE            主服务器上的日志文件MASTER_LOG_POS             主服务器上日志文件的位置MASTER_CONNECT_RETRY       重连次数

9、启动进程 

mysql>start slave;

10、检查主从同步状态，主要检查Slave_IO_Running和Slave_SQL_Running的值，两个都是YES，才说明主从连接正确。如果有一个是no，需要重新确定刚才在从服务器上执行的命令，停掉"stop slave;"，查询主库master状态，然后重新进行配置主从连接。 

11、进行测试

在主库随意创建一个库

mysql>CREATE DATABASE IF NOT EXISTS tongbu DEFAULT CHARSET utf8 COLLATE utf8_general_ci;

从库查询 

mysql>show databases;

tongbu库存在说明，Mysql主从同步完成了。