修改MySQL的数据目录

环境：CentOS Linux release 7.1.1503 (Core)

1. 安装MYSQL　　

wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
rpm -ivh mysql-community-release-el7-5.noarch.rpm 
yum install mysql-community-server
serivce mysqld start

　　此时查看数据目录，是/var/lib/mysql

2. 修改配置

2.1 修改安全限制

vim /etc/selinux/config

     将内容修改如下：

# SELINUX=enforcing
SELINUX=permissive

2.2 修改数据库配置

      首先停用MySQL。

　　1. 复制数据目录

cp -R /var/lib/mysql /data/
chown -R mysql:mysql /data/mysql

　　2. 修改配置

　　　　备份/etc/my.cnf

cp /etc/my.cnf /etc/my.cnf-bk

             修改/etc/my.cnf为

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

[mysqld]
log_error = /var/log/mysql-error.log
user = mysql
datadir = /data/mysql
socket = /data/mysql/mysql.sock

[mysql]
socket = /data/mysql/mysql.sock
user = mysql

3. 验证

　　重启mysql服务，mysql客户端登录，查看datadir

mysql>   show variables like '%dir%';
+-----------------------------------------+----------------------------+
| Variable_name                           | Value                      |
+-----------------------------------------+----------------------------+
| basedir                                 | /usr                       |
| binlog_direct_non_transactional_updates | OFF                        |
| character_sets_dir                      | /usr/share/mysql/charsets/ |
| datadir                                 | /data/mysql/               |
| ignore_db_dirs                          |                            |
| innodb_data_home_dir                    |                            |
| innodb_log_group_home_dir               | ./                         |
| innodb_max_dirty_pages_pct              | 75                         |
| innodb_max_dirty_pages_pct_lwm          | 0                          |
| innodb_undo_directory                   | .                          |
| lc_messages_dir                         | /usr/share/mysql/          |
| plugin_dir                              | /usr/lib64/mysql/plugin/   |
| slave_load_tmpdir                       | /tmp                       |
| tmpdir                                  | /tmp                       |
+-----------------------------------------+----------------------------+
14 rows in set (0.03 sec)

    配置成功！！！