Linux系统MySQL数据库主从同步实战过程

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发布于 2020-09-16 16:19:07

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发布于 2020-09-16 16:19:07

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Linux系统MySQL数据库主从同步实战过程

安装环境说明

系统环境：

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

主库使用3306端口

从库使用3307端口

数据库数据目录/data

安装MySQL数据库服务

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

[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            = 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
           #主从同步的关键点，从库上不需要开启
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    #主库从库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
数据库启动脚本：
[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

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

配置主库

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.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)

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。

配置从库实现主从同步

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 status\G"|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

测试主从同步

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

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原始发表：2017-03-05，如有侵权请联系 cloudcommunity@tencent.com 删除

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