有时候我们需要快速的部署一套集群环境，但是在机器不允许的情况下只能在单机上实现。单机实现就会使用到多个端口了，同时为了保证服务的互不影响就要做文件或数据目录独立分开。本文记录Mysql单机多实例部署方法；

简单、快速在已经安装Mysql的服务器上，添加几个实例：

mysql的安装目录： /usr/local/mysql-5.6.28/

数据存放目录：/data/mysql/

部署多实例前先把数据库停止：

service mysql stop

添加三个实例：分别为mysql-01 、mysql-02、 mysql-03

创建目录：

mkdir -p /data/{mysql-01,mysql-02,mysql-03}

授权：

chwon -R mysql:mysql /data/mysql-0*

复制原来的数据库文件：

cp -rf /data/mysql/mysql/ /data/mysql-01/

cp -rf /data/mysql/mysql/ /data/mysql-02/

cp -rf /data/mysql/mysql/ /data/mysql-03/

原来的my.cnf配置文件备份一下,再修改：

cp /etc/my.cnf /etc/my.cnf.$(date +%F)

修改配置文件：

cat >/etc/my.cnf<

[client]

port = 3306

socket = /tmp/mysql.sock

[mysqld]

max-connections=800

[mysqld_multi]

mysqld = /usr/local/mysql-5.6.28/bin/mysqld_safe

mysqladmin = /usr/local/mysql-5.6.28/bin/mysqladmin

log = /usr/local/mysql-5.6.28/mysql_multi.log

[mysqld1]

datadir = /data/mysql-01

socket = /tmp/mysql.sock-01

port = 3306

user = mysql

performance_schema = off

innodb_buffer_pool_size = 32M

bind_address = 0.0.0.0

skip_name_resolve

[mysqld2]

datadir = /data/mysql-02

socket = /tmp/mysql.sock-02

port = 3307

user = mysql

performance_schema = off

innodb_buffer_pool_size = 32M

bind_address = 0.0.0.0

skip_name_resolve

EOF

要注意以上配置中的目录，并保证端口和socket文件不冲突。

[root@lamp-11 ~]# mysqld_multi report

Reporting MySQL servers

MySQL server from group: mysqld1 is not running

MySQL server from group: mysqld2 is not running

MySQL server from group: mysqld3 is not running

启动实例：可以使用mysqld_multi start 1 一个个启动；

也可以直接：mysqld_multi start 全部一齐启动：

检查效果：

[root@lamp-11 ~]# mysqld_multi report

Reporting MySQL servers

MySQL server from group: mysqld1 is running

MySQL server from group: mysqld2 is running

MySQL server from group: mysqld3 is running

连接数据库时使用指定的socket文件：

[root@lamp-11 ~]# ll /tmp/mysql.sock*

srwxrwxrwx 1 mysql mysql 0 Dec 26 15:57 /tmp/mysql.sock-01

srwxrwxrwx 1 mysql mysql 0 Dec 26 15:57 /tmp/mysql.sock-02

srwxrwxrwx 1 mysql mysql 0 Dec 26 15:57 /tmp/mysql.sock-03