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MySQL數據庫主從同步實戰過程詳解

安裝環境說明

系統環境：

[root@~]# cat /etc/redhat-release 
CentOS release 6.5 (Final)
[root@~]# uname -r
2.6.32-431.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

主庫使用3306端口
從庫使用3307端口
數據庫數據目錄/data

安裝MySQL數據庫服務

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

[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   = 3306
socket   = /data/3306/mysql.sock

[mysql]
no-auto-rehash

[mysqld]
user = mysql
port = 3306
socket = /data/3306/mysql.sock
basedir = /application/mysql
datadir = /data/3306/data
open_files_limit = 1024
back_log = 600

max_connections = 800
max_connect_errors = 3000
table_cache = 614
external-locking = FALSE
max_allowed_packet =8M
sort_buffer_size = 1M
join_buffer_size = 1M
thread_cache_size = 100
thread_concurrency = 2
query_cache_size = 2M
query_cache_limit = 1M
query_cache_min_res_unit = 2k
thread_stack = 192K
tmp_table_size = 2M
max_heap_table_size = 2M
long_query_time = 1

pid-file = /data/3306/mysql.pid
log-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-bin
relay-log-info-file = /data/3306/relay-log.info
binlog_cache_size = 1M
max_binlog_cache_size = 1M
max_binlog_size = 2M
expire_logs_days = 7
key_buffer_size = 16M
read_buffer_size = 1M
read_rnd_buffer_size = 1M
bulk_insert_buffer_size = 1M
lower_case_table_names = 1
skip-name-resolve
slave-skip-errors = 1032,1062
replicate-ignore-db=mysql
server-id = 1 #主庫從庫ID 不可相同

[mysqldump]
quick
max_allowed_packet = 2M

[mysqld_safe]
log-error=/data/3306/mysql3306.err
pid-file=/data/3306/mysqld.pid

數據庫啟動腳本：

[root@~]#vi /data/3306/mysql
#!/bin/sh
port=3306
user="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 $1 in
start)
 start_mysql
;;
stop)
 stop_mysql
;;
restart)
 restart_mysql
;;
*)
 printf "Usage: /data/${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

配置主庫

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.sock

mysql> 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。

配置從庫實現主從同步

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 status\G"|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

測試主從同步

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。

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