Linux下修改MySQL数据库数据文件路径的步骤

使用rpm安装方式安装完mysql数据库后，数据文件的默认路径为/var/lib/mysql，然而根目录并不适合用于存储数据文件。

原路径：/var/lib/mysql

目标路径：/home/mysql_data/mysql

linux系统版本：centos7.6

mysql数据库版本：5.7.25

步骤：

1、创建目标路径

mkdir -p /home/mysql_data

2、关闭mysql

systemctl stop mysqld

3、复制数据文件

cp -arp /var/lib/mysql /home/mysql_data

4、修改配置文件/etc/my.cnf

将datadir和socket中的原路径修改为目标路径

datadir=/home/mysql_data/mysql
socket=/home/mysql_data/mysql/mysql.sock

5、启动mysql服务

systemctl start mysqld

note:

1、报错如下：

2019-12-22t08:32:42.430564z 0 [error] innodb: operating system error number 13 in a file operation.
2019-12-22t08:32:42.430599z 0 [error] innodb: the error means mysqld does not have the access rights to the directory.
2019-12-22t08:32:42.430616z 0 [note] innodb: creating shared tablespace for temporary tables
2019-12-22t08:32:42.430898z 0 [error] innodb: the innodb_temporary data file 'ibtmp1' must be writable
2019-12-22t08:32:42.430923z 0 [error] innodb: the innodb_temporary data file 'ibtmp1' must be writable
2019-12-22t08:32:42.430936z 0 [error] innodb: could not create the shared innodb_temporary.
2019-12-22t08:32:42.430952z 0 [error] innodb: plugin initialization aborted with error generic error
2019-12-22t08:32:43.038973z 0 [error] innodb: operating system error number 13 in a file operation.
2019-12-22t08:32:43.039021z 0 [error] innodb: the error means mysqld does not have the access rights to the directory.
2019-12-22t08:32:43.039037z 0 [error] plugin 'innodb' init function returned error.
2019-12-22t08:32:43.039046z 0 [error] plugin 'innodb' registration as a storage engine failed.
2019-12-22t08:32:43.039056z 0 [error] failed to initialize builtin plugins.
2019-12-22t08:32:43.039063z 0 [error] aborting

解决：

执行命令：

setenforce 1

再重新启动

2、报错如下：

can't connect to local mysql server through socket '/var/lib/mysql/mysql.sock'

解决：

修改配置文件my.cnf,添加或修改如下配置：

[client]
socket = /home/mysql_data/mysql/mysql.sock

总结

以上所述是小编给大家介绍的linux下修改mysql数据库数据文件路径，希望对大家有所帮助