MySQL数据库主从同步实战过程详解

本文实例讲述了MySQL数据库主从同步实战过程。分享给大家供大家参考，具体如下：

接上一篇：MySQL数据库入门之备份数据库

系统环境：

[root@~]# cat /etc/redhat-release CentOS release 6.5 (Final)[root@~]# uname -r2.6.32-431.el6.x86_64

数据库：

由于是模拟环境，主从库在同一台服务器上，服务器IP地址192.168.1.7

下载软件包

今天我们是用二进制安装包进行布署MySQL数据库服务，其它方式的安装布署方法请参考前面的文章

[root@~]#wget http://mirrors.sohu.com/mysql/MySQL-5.5/mysql-5.5.51-linux2.6-x86_64.tar.gz

创建数据目录、软件安装目录

[root@~]#mkdir /data｛3306，3307｝ -p[root@~]#mkdri /application

解压软件

[root@~]#tar zxf mysql-5.5.51-linux2.6-x86_64.tar.gz [root@~]#mv mysql-5.5.51-linux2.6-x86_64 /application/mysql-5.5.51[root@~]#ln -s /application/mysql-5.5.51 /application/mysql

创建用户

[root@~]#groupadd mysql[root@~]#useradd -g mysql -M mysql

初始化数据库

[root@~]#/application/mysql/scripts/mysql_install_db --basedir=/application/mysql --datadir=/data/3306/data --user=mysql[root@~]#/application/mysql/scripts/mysql_install_db --basedir=/application/mysql --datadir=/data/3307/data --user=mysql

创建配置文件

[root@~]#vi /data/3306/my.cnf[client]port = 3306socket = /data/3306/mysql.sock[mysql]no-auto-rehash[mysqld]user = mysqlport = 3306socket = /data/3306/mysql.sockbasedir = /application/mysqldatadir = /data/3306/dataopen_files_limit = 1024back_log = 600max_connections = 800max_connect_errors = 3000table_cache = 614external-locking = FALSEmax_allowed_packet =8Msort_buffer_size = 1Mjoin_buffer_size = 1Mthread_cache_size = 100thread_concurrency = 2query_cache_size = 2Mquery_cache_limit = 1Mquery_cache_min_res_unit = 2kthread_stack = 192Ktmp_table_size = 2Mmax_heap_table_size = 2Mlong_query_time = 1pid-file = /data/3306/mysql.pidlog-bin = /data/3306/mysql-bin#主从同步的关键点，从库上不需要开启relay-log = /data/3306/relay-binrelay-log-info-file = /data/3306/relay-log.infobinlog_cache_size = 1Mmax_binlog_cache_size = 1Mmax_binlog_size = 2Mexpire_logs_days = 7key_buffer_size = 16Mread_buffer_size = 1Mread_rnd_buffer_size = 1Mbulk_insert_buffer_size = 1Mlower_case_table_names = 1skip-name-resolveslave-skip-errors = 1032,1062replicate-ignore-db=mysqlserver-id = 1 #主库从库ID 不可相同[mysqldump]quickmax_allowed_packet = 2M[mysqld_safe]log-error=/data/3306/mysql3306.errpid-file=/data/3306/mysqld.pid

数据库启动脚本：

[root@~]#vi /data/3306/mysql#!/bin/shport=3306user='root'pwd='123456'Path='/application/mysql/bin'sock='/data/${port}/mysql.sock'start_mysql(){ if [ ! -e '$sock' ];then printf 'Starting MySQL...n' /bin/sh ${Path}/mysqld_safe --defaults-file=/data/${port}/my.cnf 2>&1 > /dev/null & else printf 'MySQL is running...n' exit fi}stop_mysql(){ if [ ! -e '$sock' ];then printf 'MySQL is stopped...n' exit else printf 'Stoping MySQL...n' ${Path}/mysqladmin -u ${user} -p${pwd} -S /data/${port}/mysql.sock shutdown fi}restart_mysql(){ printf 'Restarting MySQL...n' stop_mysql sleep 2 start_mysql}case $1 instart) start_mysql;;stop) stop_mysql;;restart) restart_mysql;;*) printf 'Usage: /data/${port}/mysql {start|stop|restart}n'esac

备注：主从库配置文件与启动文件一样，只需修改端口与server-id即可完成配置

授权目录并增加启动文件可执行权限

[root@~]#chown -R mysql.mysql /data[root@~]#find /data -name mysql -exex chmod +x {} ;

启动数据库

[root@~]#/data/3306/mysql start[root@~]#/data/3307/mysql start

修改默认数据库密码

[root@~]#mysqladmin -uroot password ’123456’ -S /data/3306/mysql.sock[root@~]#mysqladmin -uroot password ’123456’ -S /data/3307/mysql.sock

测试登陆，可以登陆两个数据库即可完成全部安装过程

1）备份主库

mkdir /backup

登陆主库创建用步同户并授权

[root@~]#mysql -uroot -p123456 -S /data/3306/mysql.sockmysql> grant replication slave on *.* to rep@’192.168.1.%’ identified by’123456’;Query OK, 0 rows affected (0.00 sec)mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)

执行锁表操作

[root@~]#/application/mysql/bin/mysql -uroot -p123456 -S /data/3306/mysql.sock -e 'flush table with read lock;'

备份主库

[root@~]#/application/mysql/bin/mysql -uroot -p123456 -S /data/3306/mysql.sock -e 'show master status;' >/backup/mysql.log[root@~]#/application/mysql/bin/mysqldump -uroot -p123456 -S /data/3306/mysql.sock -A -B |gzip >/backup/mysql.sql.gz

解除锁表状态

[root@~]#/application/mysql/bin/mysql -uroot -p123456 -S /data/3306/mysql.sock -e 'unlock tables;'

备注：以上操作也可以登陆主库进行，但是需要注意的是，执行锁表操作后，需要另开启一个窗口进行数据备份，不可直接退出，防止有数据写入导致备份的数据不完整。最好是使用非交互式操作。

将主库的备份文件解压并恢复数据库

[root@backup ]#gzip -d mysql.sql.gz[root@backup ]#/application/mysql/bin/mysql -uroot -p123456 -S /data/3307/mysql.sock < mysql.sql

查看LOG日志

[root@backup ]#cat mysql.log+------------------+----------+--------------+------------------+| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |+------------------+----------+--------------+------------------+| mysql-bin.000002 | 424 | | |+------------------+----------+--------------+------------------+

登陆从库执行下面的操作

mysql> CHANGE MASTER TO -> MASTER_HOST=’192.168.1.7’, #服务器IP -> MASTER_PORT=3306, #主库端口 -> MASTER_USER=’rep’, #同步的用户 -> MASTER_PASSWORD=’123456’, #同步的用户密码 -> MASTER_LOG_FILE=’ mysql-bin.000002’, #binlog文件 -> MASTER_LOG_POS=424; #位置点mysql> start slave; #开启同步

等待60S后查看同步状态

[root@backup ]# mysql -S /data/3307/mysql.sock -e 'show slave statusG'|egrep 'Seconds_Behind_Master|_Running' Slave_IO_Running: Yes Slave_SQL_Running: Yes Seconds_Behind_Master: 0

只要出现上述情况说明主从同步成功

主库创建一个数据库

[root@backup ~]# mysql -S /data/3306/mysql.sock -e 'create database tongbuku'[root@backup ~]# mysql -S /data/3306/mysql.sock -e 'show databases'+-----------------------------+| Database |+-----------------------------+| information_schema || mysql || performance_schema || test || tongbuku |+-----------------------------+

查看从库同步情况

[root@backup ~]# mysql -S /data/3307/mysql.sock -e 'show databases'+-----------------------------+| Database |+-----------------------------+| information_schema || mysql || performance_schema || test || tongbuku |+-----------------------------+

表明主从同步状态正常，也可以在主库新的数据表中创建表，再插入新的数据来测试主从同步状态

更多关于MySQL相关内容感兴趣的读者可查看本站专题：《MySQL查询技巧大全》、《MySQL常用函数大汇总》、《MySQL日志操作技巧大全》、《MySQL事务操作技巧汇总》、《MySQL存储过程技巧大全》及《MySQL数据库锁相关技巧汇总》

希望本文所述对大家MySQL数据库计有所帮助。