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I have a freshly installed Ubuntu 12.04 x64 server and I installed Percona server from their official repositories.

Trouble is it will not start!

mysql-error.log shows nothing obvious.

121129 12:16:54 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql/
121129 12:16:54 [Note] Plugin 'FEDERATED' is disabled.
121129 12:16:54 InnoDB: The InnoDB memory heap is disabled
121129 12:16:54 InnoDB: Mutexes and rw_locks use GCC atomic builtins
121129 12:16:54 InnoDB: Compressed tables use zlib 1.2.3
121129 12:16:54 InnoDB: Using Linux native AIO
121129 12:16:54 InnoDB: Initializing buffer pool, size = 12.0G
121129 12:16:54 InnoDB: Completed initialization of buffer pool
121129 12:16:54 InnoDB: highest supported file format is Barracuda.
121129 12:16:55  InnoDB: Waiting for the background threads to start
121129 12:16:56 Percona XtraDB ( 1.1.8-rel29.1 started; log sequence number 1598476
121129 12:16:56 [Note] Server hostname (bind-address): ''; port: 3306
121129 12:16:56 [Note]   - '' resolves to '';
121129 12:16:56 [Note] Server socket created on IP: ''.
121129 12:16:56 [Note] Event Scheduler: Loaded 0 events
121129 12:16:56 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.5.28-29.1-log'  socket: '/var/run/mysqld/mysql.sock'  port: 3306  Percona Server (GPL), Release 29.1
121129 12:16:56 [Note] Event Scheduler: scheduler thread started with id 1

And the syslog shows...

Nov 29 12:17:07 V-PF-SQL1 /etc/init.d/mysql[2206]: 0 processes alive and '/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf ping' resulted in
Nov 29 12:17:07 V-PF-SQL1 /etc/init.d/mysql[2206]: #007/usr/bin/mysqladmin: connect to server at 'localhost' failed
Nov 29 12:17:07 V-PF-SQL1 /etc/init.d/mysql[2206]: error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)'
Nov 29 12:17:07 V-PF-SQL1 /etc/init.d/mysql[2206]: Check that mysqld is running and that the socket: '/var/run/mysqld/mysqld.sock' exists!
Nov 29 12:17:07 V-PF-SQL1 /etc/init.d/mysql[2206]: 

The socket file is being created and I can access the server NOT using the socket using

mysql -h -P 3306 -u root --pPASSWORD

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what are the permissions and ownership of the socket file? – Waleed Hamra Nov 29 '12 at 13:17
mysql:mysql 777 – Lee Armstrong Nov 29 '12 at 13:26
Can you add your my.cnf and any other configuration directive files you have to your post? This post might also help:… – Daemon of Chaos Nov 29 '12 at 13:49
In fact I just fixed it by removing the socket from the my.cnf. Strangely set to the same path as the default! – Lee Armstrong Nov 29 '12 at 14:00

Are you really sure you didn't touch any configuration? I spot this:

socket: '/var/run/mysqld/mysql.sock' (server log)

socket '/var/run/mysqld/mysqld.sock' (syslog)

I think you see it now too.

The actual default is to have the socket in /var/run/mysqld/mysqld.sock. Make sure there's no leftover config in /etc/mysql/conf.d for example.

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