以下內(nèi)容為在學(xué)習(xí)MYSQL 過程中的實驗步驟，

mysql多實例（mysqld_multi方式）

1.建立各個實例的目錄

?? ?[root@mdw ~]# mkdir /mnt/data/mysql/3306 /mnt/data/mysql/3307 /mnt/data/mysql/3308 -p
?? ?[root@mdw ~]# chown -R mysql:mysql /mnt/data/mysql/3306 /mnt/data/mysql/3307 /mnt/data/mysql/3308
?? ?[root@mdw ~]#

2.初始化各個實例

?? ?/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/mnt/data/mysql/3306 --user=mysql
?? ?/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/mnt/data/mysql/3307 --user=mysql
?? ?/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/mnt/data/mysql/3308 --user=mysql

3.修改配置，my.cnf 配置文件修改后如下：

?? ?[root@mdw ~]# cat /etc/my.cnf
?? ?[mysqld_multi]
?? ?mysqld = /usr/local/mysql/bin/mysqld_safe
?? ?mysqladmin = /usr/local/mysql/bin/mysqladmin

?? ?user = root
?? ?password = sa123

?? ?[mysqld3306]
?? ?datadir = /mnt/data/mysql/3306
?? ?port = 3306
?? ?socket = /tmp/mysql3306.sock

?? ?log-bin = /mnt/data/mysql/3306/mysql-bin
?? ?pid-file = /mnt/data/mysql/3306/mysql_3306.pid
?? ?log-error=/var/log/3306.log


?? ?[mysqld3307]
?? ?datadir = /mnt/data/mysql/3307
?? ?port = 3307
?? ?socket = /tmp/mysql3307.sock

?? ?log-bin = /mnt/data/mysql/3307/mysql-bin
?? ?pid-file = /mnt/data/mysql/3307/mysql_3307.pid
?? ?log-error=/var/log/3307.log


?? ?[mysqld3308]
?? ?datadir = /mnt/data/mysql/3308
?? ?port = 3308
?? ?socket = /tmp/mysql3308.sock

?? ?log-bin = /mnt/data/mysql/3308/mysql-bin
?? ?pid-file = /mnt/data/mysql/3308/mysql_3308.pid
?? ?log-error=/var/log/3308.log



?? ?#[mysqld]
?? ?#datadir=/usr/local/mysql/data
?? ?#socket=/usr/local/mysql/data/mysql.sock
?? ?#user=mysql
?? ?# Disabling symbolic-links is recommended to prevent assorted security risks
?? ?#symbolic-links=0

?? ?#[mysqld_safe]
?? ?#log-error=/var/log/mysqld.log
?? ?#pid-file=/var/run/mysqld/mysqld.pid

?? ?#[client]
?? ?#socket=/usr/local/mysql/data/mysql.sock
?? ?[root@mdw ~]#

4.啟動 3306,3307,3308 各端口的mysql 實例

?? ?[root@mdw ~]# /usr/local/mysql/bin/mysqld_multi start 3306
?? ?[root@mdw ~]# /usr/local/mysql/bin/mysqld_multi start 3307
?? ?[root@mdw ~]# /usr/local/mysql/bin/mysqld_multi start 3308


?? ?#error 一個錯誤處理
?? ?[root@mdw ~]# /usr/local/mysql/bin/mysqld_multi start 3306
?? ?WARNING: my_print_defaults command not found.
?? ?Please make sure you have this command available and
?? ?in your path. The command is available from the latest
?? ?MySQL distribution.
?? ?ABORT: Can't find command 'my_print_defaults'.
?? ?This command is available from the latest MySQL
?? ?distribution. Please make sure you have the command
?? ?in your PATH.

?? ?在.bash_profile 添加路徑：

?? ??? ?MYSQL_PATH=/usr/local/mysql/bin;
?? ??? ?PATH=$PATH:$HOME/bin:$MYSQL_PATH
?? ??? ?
?? ??? ?export PATH

?? ?或者直接命令行輸入：export PATH=/usr/local/mysql/bin:$PATH

/usr/local/mysql/bin/mysqladmin -u root -h mdw password 'new-password'

5.查看端口狀態(tài)，看是否正常運行

?? ?[root@mdw ~]# netstat -anp | grep 3308
?? ?tcp??????? 0????? 0 :::3308???????????????????? :::*??????????????????????? LISTEN????? 31535/mysqld?????? ?
?? ?unix? 2????? [ ACC ]???? STREAM???? LISTENING???? 496621 31535/mysqld??????? /tmp/mysql3308.sock
?? ?[root@mdw ~]# netstat -anp | grep 3307
?? ?tcp??????? 0????? 0 :::3307???????????????????? :::*??????????????????????? LISTEN????? 31372/mysqld?????? ?
?? ?unix? 2????? [ ACC ]???? STREAM???? LISTENING???? 496593 31372/mysqld??????? /tmp/mysql3307.sock
?? ?[root@mdw ~]# netstat -anp | grep 3306
?? ?tcp??????? 0????? 0 :::3306???????????????????? :::*??????????????????????? LISTEN????? 31211/mysqld?????? ?
?? ?unix? 2????? [ ACC ]???? STREAM???? LISTENING???? 496460 31211/mysqld??????? /tmp/mysql3306.sock
?? ?[root@mdw ~]#

6.初始化密碼

?? ?6.1 實例：3306,
?? ?/usr/local/mysql/bin/mysqladmin -u root password "sa123" -S /tmp/mysql3306.sock


?? ?/usr/local/mysql/bin/mysql -uroot -pCleverCode123 -S? /tmp/mysql3306.sock
?? ?grant all privileges on? *.* to 'root'@'127.0.0.1' identified by 'sa123' with grant option;
?? ?flush privileges;

?? ?/usr/local/mysql/bin/mysqladmin -u root password "saPsd" -S /tmp/mysql3306.sock


?? ?實例：3307
?? ?/usr/local/mysql/bin/mysqladmin -u root password "sa123" -S /tmp/mysql3307.sock
?? ?/usr/local/mysql/bin/mysql -uroot -psa123 -S? /tmp/mysql3307.sock
?? ?grant all privileges on? *.* to 'root'@'127.0.0.1' identified by 'sa123' with grant option;
?? ?flush privileges;

?? ?實例：3308
?? ?/usr/local/mysql/bin/mysqladmin -u root password "sa123" -S /tmp/mysql3308.sock
?? ?/usr/local/mysql/bin/mysql -uroot -pCleverCode123 -S? /tmp/mysql3308.sock
?? ?grant all privileges on? *.* to 'root'@'127.0.0.1' identified by 'sa123' with grant option;
?? ?flush privileges;


?? ?操作明細：
?? ?[root@mdw ~]# /usr/local/mysql/bin/mysqladmin -u root password "sa123" -S /tmp/mysql3306.sock
?? ?Warning: Using a password on the command line interface can be insecure.

?? ?[root@mdw ~]# /usr/local/mysql/bin/mysql -uroot -psa123 -S? /tmp/mysql3306.sock
?? ?Warning: Using a password on the command line interface can be insecure.
?? ?Welcome to the MySQL monitor.? Commands end with ; or \g.
?? ?Your MySQL connection id is 4
?? ?Server version: 5.6.35-log Source distribution

?? ?Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

?? ?Oracle is a registered trademark of Oracle Corporation and/or its
?? ?affiliates. Other names may be trademarks of their respective
?? ?owners.

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

?? ?mysql> grant all privileges on? *.* to 'root'@'127.0.0.1' identified by 'sa123' with grant option;
?? ?Query OK, 0 rows affected (0.02 sec)

?? ?mysql> flush privileges;
?? ?Query OK, 0 rows affected (0.01 sec)

?? ?mysql>




參考：

http://blog.csdn.net/clevercode/article/details/47659457

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