一、准备配置文件、目录

step1 准备数据目录

mkdir -p /data/330{
    7,8,9}/data

step2 准备配置文件

vim /data/3307/my.cnf
[mysqld]
basedir=/usr/local/mysql
datadir=/data/3307/data
socket=/data/3307/mysql.sock
log_error=/data/3307/mysql.log
port=3307
server_id=7
---------------------------
vim /data/3308/my.cnf
[mysqld]
basedir=/usr/local/mysql
datadir=/data/3308/data
socket=/data/3308/mysql.sock
log_error=/data/3308/mysql.log
port=3308
server_id=8
---------------------------
vim /data/3309/my.cnf
[mysqld]
basedir=/usr/local/mysql
datadir=/data/3309/data
socket=/data/3309/mysql.sock
log_error=/data/3309/mysql.log
port=3309
server_id=9

二、初始化数据

mv /etc/my.cnf /etc/my.cnf.bak
mysqld --initialize-insecure  --user=mysql --datadir=/data/3307/data --basedir=/usr/local/mysql
mysqld --initialize-insecure  --user=mysql --datadir=/data/3308/data --basedir=/usr/local/mysql
mysqld --initialize-insecure  --user=mysql --datadir=/data/3309/data --basedir=/usr/local/mysql

三、配置 systemd 管理

cd /etc/systemd/system
cp mysqld.service mysqld3307.service 
cp mysqld.service mysqld3308.service 
cp mysqld.service mysqld3309.service 

vim mysqld3307.service 
ExecStart=/usr/local/mysql/bin/mysqld --defaults-file=/data/3307/my.cnf
vim mysqld3308.service 
ExecStart=/usr/local/mysql/bin/mysqld --defaults-file=/data/3308/my.cnf
vim mysqld3309.service 
ExecStart=/usr/local/mysql/bin/mysqld --defaults-file=/data/3309/my.cnf

四、授权

chown -R mysql.mysql /data/*

五、启动服务

启动

systemctl start mysqld3307.service 
systemctl start mysqld3308.service 
systemctl start mysqld3309.service 

验证

netstat -lnp|grep 330
---------------------------
mysql -S /data/3307/mysql.sock -e "show variables like 'server_id'"
mysql -S /data/3308/mysql.sock -e "show variables like 'server_id'"
mysql -S /data/3309/mysql.sock -e "show variables like 'server_id'"