mysql。在 unix 套接字上绑定：权限被拒绝

Question

无法启动 mysql：

130408 11:31:22 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
/usr/libexec/mysqld: Table 'plugin' is read only
130408 11:31:22 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
130408 11:31:22  InnoDB: Initializing buffer pool, size = 8.0M
130408 11:31:22  InnoDB: Completed initialization of buffer pool
130408 11:31:23  InnoDB: Started; log sequence number 0 19514977
130408 11:31:23 [ERROR] Can't start server : Bind on unix socket: Permission denied
130408 11:31:23 [ERROR] Do you already have another mysqld server running on socket: /var/lib/mysql/mysql.sock ?
130408 11:31:23 [ERROR] Aborting

130408 11:31:23  InnoDB: Starting shutdown...
130408 11:31:28  InnoDB: Shutdown completed; log sequence number 0 19514977
130408 11:31:28 [Note] /usr/libexec/mysqld: Shutdown complete
130408 11:31:28 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

另一个 mysql 没有运行：

[root@triton667 etc]# ps ax | grep mysql
 9195 pts/1    S+     0:00 grep mysql

我的.cnf：

    [mysqld]
    datadir=/var/lib/mysql
    socket=/var/lib/mysql/mysql.sock
    user=mysql
    tmpdir=/tmp
    # Disabling symbolic-links is recommended to prevent assorted security risks
    symbolic-links=0
    max_allowed_packet=256M

    [mysqld_safe]

    log-error=/var/log/mysqld.log
    pid-file=/var/run/mysqld/mysqld.pid

“/tmp”和“/var/lib/mysql”的权限为 777/

有什么建议？

UPD1：

[root@triton667 etc]# mysql_upgrade
Looking for 'mysql' as: mysql
Looking for 'mysqlcheck' as: mysqlcheck
Running 'mysqlcheck with default connection arguments
mysqlcheck: Got error: 2002: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) trying to connect
FATAL ERROR: Upgrade failed

UPD2 : plugin.MYD、plugin.MYI 和 plugin.frm 存在于 /var/lib/mysql/mysql/ 中。

端口 3306 上没有任何运行。

mysql.sock 不存在。我试图自己创建它，但在重新启动后它被删除了。

安装（所有 rw）：

[root@triton667 mysql]# mount
/dev/md1 on / type ext4 (rw,noatime,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/md0 on /boot type ext2 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
nfsd on /proc/fs/nfsd type nfsd (rw)

今天当我尝试在子域上克隆我的网站时出现了这个问题。

Answer 1

1) 首先确保使用 rm 命令删除现有的套接字文件。

rm /var/lib/mysql/mysql.sock

2) 通过以下命令杀死所有现有的 MySQL 进程。

service mysql stop

3）非常重要：确保/var/lib/文件夹下MySQL数据库目录的权限应该是mysql:root

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

4) 有了以上信息，你应该可以成功启动MySQL，并且在数据库目录下成功创建了socket文件。

service mysql start

Answer 2

感谢@Abhishek 的回答结合 mysqld 输出（不能使用 /var/run/mysqld/mysqld.sock）我设法用一个命令解决了这个问题：

chown -R mysql:root /var/run/mysqld

然后它正常启动：

root@***:~# service mysql start
df: Warning: cannot read table of mounted file systems: No such file or directory
[ ok ] Starting MySQL database server: mysqld ..
[info] Checking for tables which need an upgrade, are corrupt or were 
not closed cleanly..