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Can't start mysql with:

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

Another mysql is not runnig:

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

my.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

Permissions on "/tmp" and "/var/lib/mysql" are 777/

Any suggestions?

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 and plugin.frm are exists in /var/lib/mysql/mysql/.

Nothing running on port 3306.

mysql.sock does not exist. I tried to create it myself, but after restart it was removed.

mount(all 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)

This problem appeared today when I tried to clone my site on a subdomain.

share|improve this question
    
run mysql_upgrade as suggested? –  NickW Apr 8 '13 at 10:05
    
No. touch /var/lib/mysql/mysql.sock - Also does not work –  Aldwin Apr 8 '13 at 10:14
    
Is there a plugin.MYD, plugin.MYI and plugin.frm file under /var/lib/mysql/mysql ? –  NickW Apr 8 '13 at 10:17
    
Also, does the mysql.sock file exist in the /var/lib/mysql directory? –  NickW Apr 8 '13 at 10:18
    
Is something already running on 3306 port? –  aardvark Apr 8 '13 at 10:26

3 Answers 3

up vote 2 down vote accepted

1) First make sure you delete the existing socket file using the rm command.

rm /var/lib/mysql/mysql.sock

2) Kill all existing MySQL processes via the following command.

service mysql stop

3) Very important: Make sure the permission for the MySQL database directory under /var/lib/ folder should be mysql:root

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

4) With the above information you should be able to start MySQL successfully and the socket file should be created successfully under the database directory.

service mysql start
share|improve this answer

Based on what you write, I would suggest that you check if your filesystem is mounted read-only.

130408 11:31:22 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql /usr/libexec/mysqld: Table 'plugin' is read only

share|improve this answer

Thank you all. It's my fall. I'm aciddenly put the right 644 on the root dir :(

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