#error 28

 sudo service mysqld start

Timeout error occurred trying to start MySQL Daemon.

Starting MySQL:                                            [FAILED]

Logs /var/log/mysqld :

mysqld  Error: unable to create temporary file; errno: 28

Can't start server : Bind on unix socket: No space left on device

1. Check /tmp for permissions and space availability

2. df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/xvd               37G   35G  0M    100% /

...

tmpfs                 2.0G     0  2.0G   0% /dev/shm

Now, /tmp is under / which has 0 M available and is 100% used.

3. ls -lrt /tmp . Its lined up with loads of RackMultipart files

Reason: Paperclip Issue 

Check the no. of such files 

> ls -lrt /tmp/RackMultipart* | wc -l

> 297

4. Remove these files 

rm -f /tmp/RackMultipart*

5. Try again

sudo service mysqld start

Starting MySQL:                                            [  OK  ]

sudo service mysqld status

mysqld (pid 17048) is running...

If you're getting an EHCP Error with code 28, regardless of whether your login credentials are correct, it would look something like this:

Some Error Occured. Error Occured (source:query, caller: ) err: query: SHOW COLUMNS FROM panelusers (Got error 28 from storage engine) Got error 28 from storage engine last db error:Got error 28 from storage engine  If you just upgraded your ehcp, try to logout, login back.