Cannot Start mySQL Daemon with Error "mysqld from pid file ... ended" I cannot get MySQL to run. It was working just fine hours ago, but upon starting, repeatedly ends without telling me very much. Here are my logs

[myusername@location ~/mysql]$ ./bin/mysqld_safe --log-error=my-errors &amp;
[2] 14747
[1]    Done                          ./bin/mysqld_safe
[myusername@location ~/mysql]$ 150708 20:55:25 mysqld_safe Logging to '/rc00/d84/myusername/mysql/data/my-errors.err'.
150708 20:55:25 mysqld_safe Starting mysqld daemon with databases from /rc00/d84/myusername/mysql/data
150708 20:57:06 mysqld_safe mysqld from pid file /rc00/d84/myusername/mysql/data/ovid03.u.washington.edu.pid ended


Attempting to start the regular way leads to the following:

[myusername@location bin]$ mysqld
mysqld: Command not found.
[myusername@location bin]$ cd ..
[myusername@location mysqlver]$ ./bin/mysqld
150708 21:04:09 [Note] Plugin 'FEDERATED' is disabled.
150708 21:04:09 InnoDB: The InnoDB memory heap is disabled
150708 21:04:09 InnoDB: Mutexes and rw_locks use GCC atomic builtins
150708 21:04:09 InnoDB: Compressed tables use zlib 1.2.3
150708 21:04:09 InnoDB: Initializing buffer pool, size = 128.0M
150708 21:04:09 InnoDB: Completed initialization of buffer pool
InnoDB: Unable to lock ./ibdata1, error: 11


The last few lines repeat over and over again, as it tries to start.

I was reading around that there could be problems with ownership of files and folders, could this be it? 

[myusername@location ~]$ ls -l mysql
total 0
lrwxrwxrwx 1 myusername nousers 12 Jul  1  2013 bin -&gt; mysqlver/bin
lrwxrwxrwx 1 myusername nousers 29 Jul  1  2013 data -&gt; /rc00/d84/myusername/mysql-data
lrwxrwxrwx 1 myusername nousers 13 Jul  1  2013 docs -&gt; mysqlver/docs
lrwxrwxrwx 1 myusername nousers 16 Jul  1  2013 include -&gt; mysqlver/include
lrwxrwxrwx 1 myusername nousers 12 Jul  1  2013 lib -&gt; mysqlver/lib
lrwxrwxrwx 1 myusername nousers 12 Jul  1  2013 man -&gt; mysqlver/man
lrwxrwxrwx 1 myusername users   40 Jul  1  2013 mysqlver -&gt; /usr/local/mysql-5.5.18-linux2.6-x86_64/
lrwxrwxrwx 1 myusername nousers 16 Jul  1  2013 scripts -&gt; mysqlver/scripts
lrwxrwxrwx 1 myusername nousers 14 Jul  1  2013 share -&gt; mysqlver/share
lrwxrwxrwx 1 myusername nousers 18 Jul  1  2013 sql-bench -&gt; mysqlver/sql-bench
lrwxrwxrwx 1 myusername nousers 22 Jul  1  2013 support-files -&gt; mysqlver/support-files
lrwxrwxrwx 1 myusername nousers 14 Jul  1  2013 tests -&gt; mysqlver/tests
lrwxrwxrwx 1 myusername nousers 12 Jul  1  2013 usr -&gt; mysqlver/usr


I feel really lost right now and thank you in advance for your help. I do have a backup of the sql folder from a week ago, but am not yet ready to try putting that on to the server just yet.
InnoDB: Unable to lock ./ibdata1, error: 11


Perhaps another copy of mysqld is still running?

Only run it as a service.