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Numerizen 28th May 2010 08:16

Another MySQL start problem
 
Hello all,

I recently upgraded my Etch server to Lenny.

At the same time, I also messed with the /var directory, trying to symlink it to another partition to save space.

At some point, mysql stopped working, and I can't manage to start it again.

Starting manually doesn't help :

Code:

Starting MySQL database server: mysqld . . . . . . . . . . . . . . failed!
Here's the syslog :

Code:

May 28 08:09:10 numerizen /etc/init.d/mysql[3635]: 0 processes alive and '/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf ping' resulted in
May 28 08:09:10 numerizen /etc/init.d/mysql[3635]: ^G/usr/bin/mysqladmin: connect to server at 'localhost' failed
May 28 08:09:10 numerizen /etc/init.d/mysql[3635]: error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)'
May 28 08:09:10 numerizen /etc/init.d/mysql[3635]: Check that mysqld is running and that the socket: '/var/run/mysqld/mysqld.sock' exists!
May 28 08:09:10 numerizen /etc/init.d/mysql[3635]:

Which is not really helpful.

I'm almost sure it's a permissions problem, as I had to fix some for other services.

I tried to purge the package and reinstall but no luck.

I tried to create /var/run/mysqld/mysqld.sock manually but it didn't do any good.

Code:


[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        = /var/lib/mysql
tmpdir          = /tmp
language        = /usr/share/mysql/english
skip-external-locking

# 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        = /var/lib/mysql
tmpdir          = /tmp
language        = /usr/share/mysql/english
skip-external-locking
#
# 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            = 128K
thread_cache_size      = 8
max_connections        = 15
table_cache            = 512
#thread_concurrency    = 10
#
# * Query Cache Configuration
#

query_cache_limit      = 16M
query_cache_size        = 64M
query_cache_type        = 1
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
#log            = /var/log/mysql/mysql.log
#
# Error logging goes to syslog. This is a Debian improvement :)
#
# 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.
#server-id              = 1
#log_bin                        = /var/log/mysql/mysql-bin.log
# WARNING: Using expire_logs_days without bin_log crashes the server! See README.Debian!
#expire_logs_days      = 10
#max_binlog_size        = 100M
#binlog_do_db          = include_database_name
#binlog_ignore_db      = include_database_name
#
# * BerkeleyDB
#
# Using BerkeleyDB is now discouraged as its support will cease in 5.1.12.
skip-bdb
#
# * 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!
# You might want to disable InnoDB to shrink the mysqld process by circa 100MB.
skip-innodb
#
# * 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

#
# * NDB Cluster
#
# See /usr/share/doc/mysql-server-*/README.Debian for more information.
#
# The following configuration is read by the NDB Data Nodes (ndbd processes)
# not from the NDB Management Nodes (ndb_mgmd processes).
#
# [MYSQL_CLUSTER]
# ndb-connectstring=127.0.0.1

 
#
# * IMPORTANT: Additional settings that can override those from this file!
#
!includedir /etc/mysql/conf.d/

My production server is down and any help or hint would be greatly appreciated.

Thanks for your time

Numerizen 28th May 2010 09:02

Fixed
 
Ok, sorry for the unneeded message.

It happened that bind working directory wasn't writable and bind didn't start.

Also, permissions in /var/lib/mysql were wrong.

A few chgrp and chmod fixed this.

Sorry again.

Numerizen 18th June 2012 09:41

I stumbled on this again : the /var/lib/mysql folder has wrong permissions (root:root instead of mysql:mysql).

This is easy enough to fix, but I wonder if anyone has an explanation as to why this directory keeps being reverted to root ownership ?


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