Sorry for my English;

I was trying to create db with rake in RoR application that has been configured for MySQL(gem installed, settings changed).
After that attempt mysql-server broke:
d@calister:~$ mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

mysqld is not running at all:
d@calister:~$ ps aux | grep mysql
d 3769 0.0 0.0 4368 832 pts/0 S+ 18:03 0:00 grep --color=auto mysql

And also it doesn't seem it would like to run:
d@calister:~$ sudo service mysql start
start: Job failed to start

Any suggestions?


d@calister:~$ sudo -u mysql mysqld
120520 18:45:11 [Note] Plugin 'FEDERATED' is disabled.
mysqld: Table 'mysql.plugin' doesn't exist
120520 18:45:11 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
120520 18:45:11 InnoDB: The InnoDB memory heap is disabled
120520 18:45:11 InnoDB: Mutexes and rw_locks use GCC atomic builtins
120520 18:45:11 InnoDB: Compressed tables use zlib
120520 18:45:11 InnoDB: Initializing buffer pool, size = 128.0M
120520 18:45:11 InnoDB: Completed initialization of buffer pool
120520 18:45:11 InnoDB: highest supported file format is Barracuda.
120520 18:45:12  InnoDB: Waiting for the background threads to start
120520 18:45:13 InnoDB: 1.1.8 started; log sequence number 1589459
120520 18:45:13 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
  • related question -> askubuntu.com/questions/69380/… – hhlp May 20 '12 at 15:19
  • first, just try sudo service mysql start or sudo service mysql restart, if this doesn' work, let's investigate further :P – vicd May 20 '12 at 15:20
  • @hhlp, mysqld is not running in my case. Besides, grep socket /etc/my.cnf -> grep: /etc/my.cnf: No such file or directory – ted May 20 '12 at 15:23
  • @vicd, ...start... is already in my post. – ted May 20 '12 at 15:25
  • em, any thing wrong in your /var/log/mysql.log? try to post it out. – vicd May 20 '12 at 15:52

try this command vi /etc/mysql/my.cnf and check your mysql configure file is well written, I mean make sure no port conflict or spelling errors.

if you're not sure how to configure it well, just reset it to the default.


port        = 3306
socket      = /var/run/mysqld/mysqld.sock

socket      = /var/run/mysqld/mysqld.sock
nice        = 0


user        = mysql
pid-file    = /var/run/mysqld/mysqld.pid
socket      = /var/run/mysqld/mysqld.sock
port        = 3306
basedir     = /usr
datadir     = /var/lib/mysql
tmpdir      = /tmp
lc-messages-dir = /usr/share/mysql

bind-address        =

key_buffer      = 16M
max_allowed_packet  = 16M
thread_stack        = 192K
thread_cache_size       = 8

myisam-recover         = BACKUP

query_cache_limit   = 1M
query_cache_size        = 16M

expire_logs_days    = 10
max_binlog_size         = 100M

max_allowed_packet  = 16M


key_buffer      = 16M

!includedir /etc/mysql/conf.d/
  • i just remove all comment in conf file to save the post space, just have a try to see if there's a configuration issue in your case. – vicd May 20 '12 at 16:25
  • Haven't checked my.cnf for errors, i may upload it for you. But I assume everything is fine there. The thing i miss -- mysql.host table. – ted May 20 '12 at 16:35
  • trying to upgrade it returned -- no mysql.host table found. Having no idea how to restore it i've reinstalled mysql-server with no lost of existing dbs. As a result everything is working fine now. Thanks for your help. – ted May 20 '12 at 16:56
  • ok, let's assume it's fine with your configuration file, but if you have time just have a try. from the logs you provided, you may lost a table "mysql.plugin", have you upgraded your mysql? the table "mysql.plugin" seems likely be newly added in mysql 5.1. If yes, just try mysqld --datadir=/var/data/ --user=mysql --skip-grant-tables to ignore table checking during start progress, to if this works? I got go, let's investigate it next day. Hope you're in lucky :D – vicd May 20 '12 at 16:56
  • well, re-installation is like the Weapons of Mass Destruction, :P, anyway it works fine for you, but maybe it lacks some fun with investigation, :D – vicd May 20 '12 at 17:00

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