我知道这里有同样的线程，How to change MySQL data directory?，但是当我尝试了所有我能找到的方法（当然包括这个方法）并且仍然没有运气。
我想将我的数据库存储在＆＃34; / dlab / data / MYSQL＆＃34;中。 如果重要的话，这个目录（/ dlab）实际上是一个NFS文件夹。
我的/etc/mysql/my.cnf文件：
#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
# Here is entries for some specific programs
# The following values assume you have at least 32M ram
# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
#
# * Basic Settings
#
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /dlab/data/MYSQL
tmpdir = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 16M
max_allowed_packet = 16M
thread_stack = 192K
thread_cache_size = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover = BACKUP
#max_connections = 100
#table_cache = 64
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
query_cache_size = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file = /var/log/mysql/mysql.log
#general_log = 1
#
# Error log - should be very few entries.
#
log_error = /var/log/mysql/error.log
#
# Here you can see queries with especially long duration
#log_slow_queries = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
# other settings you may need to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completition
[isamchk]
key_buffer = 16M
#
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/
根据我提到的线程，我试过：
编辑/etc/apparmor.d/usr.sbin.mysqld文件，它看起来像这样：
# vim:syntax=apparmor
# Last Modified: Tue Jun 19 17:37:30 2007
#include <tunables/global>
/usr/sbin/mysqld {
#include <abstractions/base>
#include <abstractions/nameservice>
#include <abstractions/user-tmp>
#include <abstractions/mysql>
#include <abstractions/winbind>
capability dac_override,
capability sys_resource,
capability setgid,
capability setuid,
network tcp,
/etc/hosts.allow r,
/etc/hosts.deny r,
/etc/mysql/*.pem r,
/etc/mysql/conf.d/ r,
/etc/mysql/conf.d/* r,
/etc/mysql/*.cnf r,
/usr/lib/mysql/plugin/ r,
/usr/lib/mysql/plugin/*.so* mr,
/usr/sbin/mysqld mr,
/usr/share/mysql/** r,
/var/log/mysql.log rw,
/var/log/mysql.err rw,
# /var/lib/mysql/ r,
# /var/lib/mysql/** rwk,
/dlab/data/MYSQL/ r,
/dlab/data/MYSQL/** rwk,
/var/log/mysql/ r,
/var/log/mysql/* rw,
/var/run/mysqld/mysqld.pid rw,
/var/run/mysqld/mysqld.sock w,
/run/mysqld/mysqld.pid rw,
/run/mysqld/mysqld.sock w,
/sys/devices/system/cpu/ r,
# Site-specific additions and overrides. See local/README for details.
#include <local/usr.sbin.mysqld>
}
这不起作用，当我启动MYSQL时，它失败了。
我绑定将文件夹的所有权更改为mysql：mysql，也没有帮助。
尝试了上面提到的别名，我的/etc/apparmor.d/tunables/alias文件：
# ------------------------------------------------------------------
#
# Copyright (C) 2010 Canonical Ltd.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License published by the Free Software Foundation.
#
# ------------------------------------------------------------------
# Alias rules can be used to rewrite paths and are done after variable
# resolution. For example, if '/usr' is on removable media:
# alias /usr/ -> /mnt/usr/,
#
# Or if mysql databases are stored in /home:
alias /var/lib/mysql/ -> /dlab/data/MYSQL,
如果有人对我有任何解决方案，那将是非常好的！
编辑1：
这是错误日志，它似乎是具有权限的东西......
151230 13:30:22 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
151230 13:35:11 mysqld_safe Starting mysqld daemon with databases from /dlab/data/MYSQL
151230 13:35:11 [Warning] Using unique option prefix key_buffer instead of key_buffer_size is deprecated and will be removed in a future release. Please use the full name instead.
151230 13:35:11 [Note] /usr/sbin/mysqld (mysqld 5.5.46-0ubuntu0.14.04.2) starting as process 12902 ...
151230 13:35:11 [Warning] Can't create test file /dlab/data/MYSQL/dlab5.lower-test
151230 13:35:11 [Warning] Can't create test file /dlab/data/MYSQL/dlab5.lower-test
151230 13:35:11 [Warning] Using unique option prefix myisam-recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead.
151230 13:35:11 [Note] Plugin 'FEDERATED' is disabled.
151230 13:35:11 InnoDB: The InnoDB memory heap is disabled
151230 13:35:11 InnoDB: Mutexes and rw_locks use GCC atomic builtins
151230 13:35:11 InnoDB: Compressed tables use zlib 1.2.8
151230 13:35:11 InnoDB: Using Linux native AIO
151230 13:35:11 InnoDB: Initializing buffer pool, size = 128.0M
151230 13:35:11 InnoDB: Completed initialization of buffer pool
151230 13:35:11 InnoDB: Operating system error number 13 in a file operation.
InnoDB: The error means mysqld does not have the access rights to
InnoDB: the directory.
InnoDB: File name ./ibdata1
InnoDB: File operation call: 'open'.
InnoDB: Cannot continue operation.
给定的文件夹具有适当的权限（我猜）：
drwxrwxr-x 4 mysql mysql 4096 Dec 30 13:09 MYSQL
答案 0 :(得分：0)
问题在于Richard St-Cyr在给出文件夹777并遵循How to change MySQL data directory?提示解决问题后的提示时所指出的许可！