一、环境介绍

（1）系统环境介绍：
[root@linux-node2 ~]# uname -a
Linux linux-node2 3.10.0-693.5.2.el7.x86_64 #1 SMP Fri Oct 20 20:32:50 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
[root@linux-node2 ~]# cat /etc/redhat-release 
CentOS Linux release 7.4.1708 (Core) 
（2）MySQL 5.6.x版本下载
下载地址：http://mirrors.sohu.com/mysql/MySQL-5.6/

二、MySQL安装

（1）解压

[root@linux-node2 ~]# tar -zxvf mysql-5.6.12-linux-glibc2.5-x86_64.tar.gz -C /usr/local/mysql-5.6.12

（2）创建软链接

[root@linux-node2 ~]# ln -sv /usr/local/mysql-5.6.12 /usr/local/mysql

（3）创建mysql 用户

[root@linux-node2 ~]# useradd -M -s /sbin/nologin mysql

（4）创建目录结构和授权

[root@linux-node2 ~]# mkdir /data/{3306,3307}/ -p
[root@linux-node2 ~]# chown -R mysql.mysql /data

（5）初始化数据库

[root@linux-node2 ~]# /usr/local/mysql/scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/data/3306/data
[root@linux-node2 ~]# /usr/local/mysql/scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/data/3307/data

（6）修改配置

[root@linux-node2 mysql]# vim /data/3306/my.cnf 
[client]    
port        = 3306     
socket      = /data/3306/mysql3306.sock

[mysqld]    
port        = 3306     
socket      = /data/3306/mysql3306.sock     
datadir     = /data/3306/data

[root@linux-node2 mysql]# vim /data/3307/my.cnf 
[client]    
port        = 3307     
socket      = /data/3307/mysql3307.sock

[mysqld]    
port        = 3307     
socket      = /data/3307/mysql3307.sock     
datadir     = /data/3307/data

（7）启动多实例

[root@linux-node2 mysql]# /usr/local/mysql/bin/mysqld_safe --defaults-file=/data/3306/my.cnf &
[root@linux-node2 mysql]# /usr/local/mysql/bin/mysqld_safe --defaults-file=/data/3307/my.cnf &
[root@linux-node2 mysql]# netstat -tulnp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      1865/nginx: worker  
tcp        0      0 0.0.0.0:8081            0.0.0.0:*               LISTEN      1865/nginx: worker  
tcp        0      0 0.0.0.0:8082            0.0.0.0:*               LISTEN      1865/nginx: worker  
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      866/sshd            
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      2235/master         
tcp        0      0 127.0.0.1:9000          0.0.0.0:*               LISTEN      22597/php-fpm: mast 
tcp6       0      0 :::3307                 :::*                    LISTEN      11221/mysqld        
tcp6       0      0 :::22                   :::*                    LISTEN      866/sshd            
tcp6       0      0 ::1:25                  :::*                    LISTEN      2235/master         
tcp6       0      0 :::3306                 :::*                    LISTEN      10903/mysqld

（8）修改密码

[root@linux-node2 ~]# mysqladmin -u root password "123456" -S /data/3306/mysql3306.sock 
[root@linux-node2 ~]# mysqladmin -u root password "654321" -S /data/3307/mysql3307.sock

（9）登陆数据库

[root@linux-node2 ~]# mysql -uroot -p -S /data/3306/mysql3306.sock 
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.6.12 MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MySQL [(none)]> quit;
Bye
[root@linux-node2 ~]# mysql -uroot -p -S /data/3307/mysql3307.sock 
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.6.12 MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MySQL [(none)]> quit;
Bye

三、MySQL多实例启动脚本

[root@linux-node2 ~]# cat /data/3306/mysql
#!/bin/sh
#init
port=3306
mysql_user="root"
mysql_pwd="123456"
CmdPath="/usr/local/mysql/bin"
mysql_sock="/data/${port}/mysql3306.sock"
#startup function
function_start_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "Starting MySQL...\n"
${CmdPath}/mysqld_safe --defaults-file=/data/${port}/my.cnf 2>&1 >/dev/null &
else
printf "MySQL is running...\n"
exit
fi
}
#stop function
function_stop_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "MySQL is stopped...\n"
exit
else
printf "Stoping MySQL...\n"
${CmdPath}/mysqladmin -u ${mysql_user} -p${mysql_pwd} -S /data/${port}/mysql3306.sock shutdown
fi
}
#restart function
function_restart_mysql()
{
printf "Restarting MySQL...\n"
function_stop_mysql
sleep 2
function_start_mysql
}
case $1 in
start)
function_start_mysql
;;
stop)
function_stop_mysql
;;
restart)
function_restart_mysql
;;
*)
printf "Usage: /data/${port}/mysql {start|stop|restart}\n"
esac
[root@linux-node2 ~]# cat /data/3307/mysql
#!/bin/sh
#init
port=3307
mysql_user="root"
mysql_pwd="654321"
CmdPath="/usr/local/mysql/bin"
mysql_sock="/data/${port}/mysql3307.sock"
#startup function
function_start_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "Starting MySQL...\n"
${CmdPath}/mysqld_safe --defaults-file=/data/${port}/my.cnf 2>&1 >/dev/null &
else
printf "MySQL is running...\n"
exit
fi
}
#stop function
function_stop_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "MySQL is stopped...\n"
exit
else
printf "Stoping MySQL...\n"
${CmdPath}/mysqladmin -u ${mysql_user} -p${mysql_pwd} -S /data/${port}/mysql3307.sock shutdown
fi
}
#restart function
function_restart_mysql()
{
printf "Restarting MySQL...\n"
function_stop_mysql
sleep 2
function_start_mysql
}
case $1 in
start)
function_start_mysql
;;
stop)
function_stop_mysql
;;
restart)
function_restart_mysql
;;
*)
printf "Usage: /data/${port}/mysql {start|stop|restart}\n"
esac