数据库的安装路径：/usr/local/MySQL 
数据目录:/data/mysql/data
(此处mysql的解压就不再列出来了）                                  

在原来的环境上已经有安装了一个实例port3306
在此处要新进2个实例（端口为3307,3308）
[root@master2 mysql]# pwd
/data/mysql
# mkdir data3307
# mkdir data3308
chown -R mysql:mysql .
# cd scripts/
# ls
mysql_install_db
./mysql_install_db  --user=mysql datadir=/data/mysql/data3307 
./scripts/mysql_install_db  --user=mysql --datadir=/data/mysql/data3307/
./scripts/mysql_install_db  --user=mysql --datadir=/data/mysql/data3308/




配置文件（/etc/my.cnf）
[mysqld_multi]
mysqld=/usr/local/mysql/bin/mysqld
mysqladmin=/usr/local/mysql/bin/mysqladmin
user=admin   
password=123456
[mysqld3306]
port=3306
pid-file=/data/mysql/data/master2.pid
datadir=/data/mysql/data
basedir=/usr/local/mysql
socket=/tmp/mysql.sock
user = mysql
server-id = 3306
[mysqld3307]
socket=/tmp/mysql3307.sock
port=3307
datadir=/data/mysql/data3307
pid-file=/data/mysql/data/mysql3307.pid
basedir=/usr/local/mysql
user = mysql
server-id = 3307
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES 
[mysqld3308]
socket=/tmp/mysql3308.sock
port=3308
datadir=/data/mysql/data3308
pid-file=/data/mysql/data/mysql3308.pid
basedir=/usr/local/mysql
user = mysql
server-id = 3308






启动三个mysql服务
mysqld_multi start 3306
mysqld_multi start 3307
mysqld_multi start 3308




#mysql -uroot -p123456 -S ./mysql.sock(3306端口的已经设置了密码了）
mysql -uroot -p -S ./mysql3307.sock     #登录mysql
mysql -uroot -p -S ./mysql3308.sock 




netstat -ntlp |grep mysql #查看mysql端口监听
[root@master2 lib]# netstat -ntlp |grep mysql
tcp        0      0 :::3307                     :::*                        LISTEN      15878/mysqld        
tcp        0      0 :::3308                     :::*                        LISTEN      15968/mysqld        
tcp        0      0 :::3306                     :::*                        LISTEN      15819/mysqld    






设置新密码
 mysqladmin -uroot -S /tmp/mysql_3307.sock password 123456


 mysqladmin -uroot -S /tmp/mysql_3308.sock password 123456
 
 
 
 设置权限（3307,3308,3306）都要设置
 grant all on *.* to admin@'%' identified by 'root' with grant option;
 
 
 查看日志
 
 cd  /usr/local/mysql/share
 # tail -f mysqld_multi.log 

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