MySQL守护进程无法启动 - centos 6

Question

编辑:查看勾选的答案评论以解决您的问题.

每当我尝试启动SQLD服务时,我都会得到MySQL守护进程无法启动.我实际上试图通过执行以下操作来"启动"服务:

service mysqld start

也

当我输入:mysql

我明白了:

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

我知道该目录中应该有一个mysql.sock文件,所以我创建一个.但该文件只是自动删除其自我,我继续得到错误2002.

由于错误,我也无法登录PHPMyAdmin.我可以访问phpmyadmin页面但登录时我得到:#2002 Cannot log in to the MySQL server

编辑:

这是我的mysql.log文件:

131201 13:05:07 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
131201 13:18:18 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
131201 13:18:18 [Note] Plugin 'FEDERATED' is disabled.
/usr/libexec/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
131201 13:18:18 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
131201 13:18:18 InnoDB: The InnoDB memory heap is disabled
131201 13:18:18 InnoDB: Mutexes and rw_locks use GCC atomic builtins
131201 13:18:18 InnoDB: Compressed tables use zlib 1.2.3
131201 13:18:18 InnoDB: Using Linux native AIO
131201 13:18:18 InnoDB: Initializing buffer pool, size = 128.0M
131201 13:18:18 InnoDB: Completed initialization of buffer pool
131201 13:18:18  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.
131201 13:18:18 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

我跑了mysql_upgrade并得到了

Looking for 'mysql' as: mysql
Looking for 'mysqlcheck' as: mysqlcheck
FATAL ERROR: Upgrade failed

Answer 1

尝试重启apache sudo service httpd restart.为我工作.

Answer 2

导致此错误的最可能原因是您的mysql服务器未运行.当你输入mysql你正在执行mysql客户端.

尝试:

# sudo service mysql start
# mysql

更新(在OP包含登录问题之后;取自以下评论):

谢谢,看到你的日志.日志说mysql用户没有适当的访问权限.我假设你的mysql用户是mysql(可以验证/etc/my.cnf,执行

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

并尝试mysqld重新开始.

Answer 3

运行这个:

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

然后再试一次!

Answer 4

您可能需要从根（/）分区释放一些空间。通过以下方式停止mysql进程：

/etc/init.d/mysql stop

通过以下命令从mySql中删除未使用的数据库：

rm -rf [Database-Directory]

在中执行它/var/lib/mysql。现在，如果您运行df -h，您可能会对仍然充满空间感到困惑。为了删除未使用的数据库的目录，您需要使用当前目录/分区来终止进程。

停止mysql_safe或mysqld_safe然后mysqld：

ps -A

然后找到mysql的进程号（例如2234）。然后执行：

kill 2234

现在再次启动mysql：

/etc/init.d/mysql start

Answer 5

 /etc/init.d/mysqld stop

  mysqld_safe --skip-grant-tables &

  mysql_upgrade

 /etc/init.d/mysqld stop

 /etc/init.d/mysqld start