本文實例講述了MySQL數據庫主從同步實戰過程。分享給大家供大家參考，具體如下：

接上一篇：MySQL數據庫入門之備份數據庫

系統環境：

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

數據庫：

由于是模擬環境，主從庫在同一臺服務器上，服務器IP地址192.168.1.7

下載軟件包

今天我們是用二進制安裝包進行布署MySQL數據庫服務，其它方式的安裝布署方法請參考前面的文章

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

創建數據目錄、軟件安裝目錄

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

解壓軟件

[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

創建用戶

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

初始化數據庫

[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

創建配置文件

[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#主從同步的關鍵點，從庫上不需要開啟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 #主庫從庫ID 不可相同[mysqldump]quickmax_allowed_packet = 2M[mysqld_safe]log-error=/data/3306/mysql3306.errpid-file=/data/3306/mysqld.pid

數據庫啟動腳本：

[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

備注：主從庫配置文件與啟動文件一樣，只需修改端口與server-id即可完成配置

授權目錄并增加啟動文件可執行權限

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

啟動數據庫

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

修改默認數據庫密碼

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

測試登陸，可以登陸兩個數據庫即可完成全部安裝過程

1）備份主庫

mkdir /backup

登陸主庫創建用步同戶并授權

[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)

執行鎖表操作

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

備份主庫

[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

解除鎖表狀態

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

備注：以上操作也可以登陸主庫進行，但是需要注意的是，執行鎖表操作后，需要另開啟一個窗口進行數據備份，不可直接退出，防止有數據寫入導致備份的數據不完整。最好是使用非交互式操作。

將主庫的備份文件解壓并恢復數據庫

[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 | | |+------------------+----------+--------------+------------------+

登陸從庫執行下面的操作

mysql> CHANGE MASTER TO -> MASTER_HOST=’192.168.1.7’, #服務器IP -> MASTER_PORT=3306, #主庫端口 -> MASTER_USER=’rep’, #同步的用戶 -> MASTER_PASSWORD=’123456’, #同步的用戶密碼 -> MASTER_LOG_FILE=’ mysql-bin.000002’, #binlog文件 -> MASTER_LOG_POS=424; #位置點mysql> start slave; #開啟同步

等待60S后查看同步狀態

[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

只要出現上述情況說明主從同步成功

主庫創建一個數據庫

[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 |+-----------------------------+

查看從庫同步情況

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

表明主從同步狀態正常，也可以在主庫新的數據表中創建表，再插入新的數據來測試主從同步狀態

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希望本文所述對大家MySQL數據庫計有所幫助。