mariadb将系统数据库移到新位置

Question

我刚刚在Ubuntu16.04上安装了MariaDB10.1.16，但是由于空间不足，默认的数据目录不合适，我需要将它移到另一个卷。我已经将datadir条目添加到我的mysql.cnf文件中，但是当我尝试加载mysql服务时，我得到了以下结果：

ago 12 08:27:40 aristotle mysqld[13786]: 2016-08-12  8:27:40 140584295778560 [Note] Plugin 'FEEDBACK' is disabled.
ago 12 08:27:40 aristotle mysqld[13786]: 2016-08-12  8:27:40 140583574173440 [Note] InnoDB: Dumping buffer pool(s) not yet started
ago 12 08:27:40 aristotle mysqld[13786]: 2016-08-12  8:27:40 140584295778560 [ERROR] Could not open mysql.plugin table. Some plugins may be not loaded
ago 12 08:27:40 aristotle mysqld[13786]: 2016-08-12  8:27:40 140584295778560 [ERROR] Can't open and lock privilege tables: Table 'mysql.servers' doesn't exist
ago 12 08:27:40 aristotle mysqld[13786]: 2016-08-12  8:27:40 140584295778560 [Note] Server socket created on IP: '::'.
ago 12 08:27:40 aristotle mysqld[13786]: 2016-08-12  8:27:40 140584295778560 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.user' doesn't 
ago 12 08:27:40 aristotle systemd[1]: mariadb.service: Main process exited, code=exited, status=1/FAILURE
ago 12 08:27:40 aristotle systemd[1]: Failed to start MariaDB database server.
ago 12 08:27:40 aristotle systemd[1]: mariadb.service: Unit entered failed state.
ago 12 08:27:40 aristotle systemd[1]: mariadb.service: Failed with result 'exit-code'.

我的配置文件是：

[client]
# Default is Latin1, if you need UTF-8 set this (also in server section)
default-character-set = utf8 

[mysqld]
#
# * Character sets
# 
# Default is Latin1, if you need UTF-8 set all this (also in client section)
#
character-set-server  = utf8 
collation-server      = utf8_general_ci 
character_set_server   = utf8 
collation_server       = utf8_general_ci
datadir               = /BulkData/Mariadb 

我需要做什么才能使我的数据库在不同的卷上？

Answer 1

在这种情况下，您有两个选项，增加分区大小(root)，或者复制到另一个目录并创建一个symbolic link。第一种选择似乎更自然，但是，如果你做错了什么，这可能会损害你的整个系统。第二个是我的选择，因为它不涉及太多的风险，而且更容易。如果您真的想使用第一个链接，可以检查以下链接：http://www.hiroom2.com/2016/05/19/ubuntu-16-04-extend-and-reduce-lvm-root-filesystem/

如果您想使用第二种选择，只需：

• 标识目标分区(足够大的空间)，运行命令：df -h
• 检查目标分区后，停止MySQLservice：service mysql stop
• 移动文件夹(它比复制和删除它更短，也不需要检查权限)：mv /var/lib/mysql /usr/lib/mysql
• 创建符号链接：ln -s /usr/lib/mysql /var/lib/mysql
• 启动服务：service mysql start