Service mysql shutdown
It's a WARNING and a NOTICE, not an ERROR. Neither of them are responsible for the shutdown. I assume however you're getting this message because in your /etc/hostname (or dns) you have a polluted entry.

As for why mysql cares what the name resolves to, here is a post on the mailing list.


  This warning seems to come from MySQL ACL code. The reason is that 
  reverse DNS lookup returns hostname which resembles IPv4 address 
  (hostname starts with '98.158.'). One way to get rid of this warning 
  and DNS lookups is to put 
  
  skip-name-resolve 
  
  in my.cnf. However, in this case you can use only IP addresses in 
  MySQL grant tables. For more information see http://dev.mysql.com/doc/refman/5.5/en/dns.html.


If this is by intent, you may want to read this bug