为轻便地学习mysql主从，就搞个单机启动多实例来操作，记录下操作步骤：

1、编辑一个新的 my.cnf 文件用于新的server

复制代码 代码如下:

cp -p /etc/my.cnf /etc/my3307.cnf###-p是保留权限

修改配置，防止和原有配置冲突。主要需要修改的有：

端口(port)、socket 文件路径 (socket)、数据文件路径 (datadir)；

如果用到 InnoDB(一般都会用到)，则要修改 InnoDB 数据文件路径 (innodb_data_home_dir)、InnoDB 日志文件路径 (innodb_log_group_home_dir)；

如果用到replication时，还要修改server的唯一id (server-id)、下载到master的binlog的存放路径 (relay-log)等。其他配置修改，则根据具体情况自行调整。

以我测试环境修改为例：

less /etc/my.cnf

复制代码 代码如下:

[mysqld]

datadir=/data/dbdata/

skip-name-resolve

#lower_case_table_names=1

character-set-server = utf8

event_scheduler=ON

skip-name-resolve

innodb_file_per_table=1

log_bin_trust_function_creators=1

wait_timeout=300

interactive_timeout=300

#federated

# generic configuration options

port = 3306

socket = /usr/local/mysql/tmp/mysql.sock

修改my3307.cnf

vi /etc/my3307.cnf

复制代码 代码如下:

[mysqld]

datadir=/data/dbdata3307/

skip-name-resolve

#lower_case_table_names=1

character-set-server = utf8

event_scheduler=ON

skip-name-resolve

innodb_file_per_table=1

log_bin_trust_function_creators=1

wait_timeout=300

interactive_timeout=300

#federated

# generic configuration options

port = 3307

socket = /tmp/mysql3307.sock

2、初始化DB

复制代码 代码如下:

/usr/local/mysql/bin/mysql_install_db --defaults-file=/etc/my3307.cnf

chown -R mysql.mysql /data/dbdata3307

3、启动mysql

复制代码 代码如下:

mysqld_safe --defaults-file=/etc/my3307.cnf &

---登陆

mysql -S /tmp/mysql3307.sock

mysql -S /tmp/mysql3307.sock

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.1.50-log Source distribution

Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

This software comes with ABSOLUTELY NO WARRANTY. This is free software,

and you are welcome to modify and redistribute it under the GPL v2 license

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

root@(none) 15:12>show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| mysql |

| test |

+--------------------+

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