Can't start MySQL server if the .sock file is changed in /etc/mysql/my.cnf

[pravsemilo]

have installed MySQL server 5.5 on Ubuntu 12.04. I am trying to start MySQL server on a different sock file. By default MySQL runs on /var/run/mysqld/mysqld.sock.

I am trying to run the same server on /var/run/mysqld/mysqld1.sock.

For this I have made the following changes:

Changes to /etc/mysql/my.cnf


[client]
port = 3306
socket = /var/run/mysqld/mysqld1.sock
[mysqld_safe]
socket = /var/run/mysqld/mysqld1.sock
nice = 0

[mysqld]
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld1.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
lc-messages-dir = /usr/share/mysql I also added the following line to /etc/apparmor.d/usr/sbin.mysqld


/var/run/mysqld/mysqld1.sock w,
/var/run/mysqld/mysqld[1-9].sock w, I also changed the ownership for the directory /var/run/mysqld to mysql user.


ls -lA /var/run/ | grep mysqld
drwxrwxrwx 2 mysql mysql 40 Dec 31 17:24 mysqld However when I try to start MySQL server I get the following error (As a root user)


mysqld --user=mysql --verbose
121231 18:40:56 [Note] Plugin 'FEDERATED' is disabled.
121231 18:40:56 InnoDB: The InnoDB memory heap is disabled
121231 18:40:56 InnoDB: Mutexes and rw_locks use GCC atomic builtins
121231 18:40:56 InnoDB: Compressed tables use zlib 1.2.3.4
121231 18:40:56 InnoDB: Initializing buffer pool, size = 128.0M
121231 18:40:56 InnoDB: Completed initialization of buffer pool
121231 18:40:56 InnoDB: highest supported file format is Barracuda.
121231 18:40:57 InnoDB: Waiting for the background threads to start
121231 18:40:58 InnoDB: 1.1.8 started; log sequence number 1595685
121231 18:40:58 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306
121231 18:40:58 [Note] - '127.0.0.1' resolves to '127.0.0.1';
121231 18:40:58 [Note] Server socket created on IP: '127.0.0.1'.
121231 18:40:58 [ERROR] Can't start server : Bind on unix socket: Permission denied 121231 18:40:58 [ERROR] Do you already have another mysqld server running on socket: /var/run/mysqld/mysqld1.sock ? 121231 18:40:58 [ERROR] Aborting
121231 18:40:58 InnoDB: Starting shutdown...
121231 18:40:58 InnoDB: Shutdown completed; log sequence number 1595685
121231 18:40:58 [Note] mysqld: Shutdown complete If I start the server with the default socket file, I am able to start the server. I have googled about this issue but only found solutions suggesting it to be permissions issue. However the permissions seems fine. Some have suggested that AppArmor might be a cause, but I have checked that too - snippet is pasted above.

Can someone provide some clues?

[pravsemilo]

I have resolved the problem. The fix was to add a new entry to the /etc/apparmor.d/usr.sbin.mysqld file.

/var/run/mysqld/mysqld1.sock w,

This fixed the issue.

[vksingh]

It looks like a port conflict