VMware vCenter Server Appliance 5.0 service stops unexpectedly

Sometimes VMware vCenter Server Appliance 5.0 stops unexpectedly
There are two ways to resolve this problem,

1) Restarting the service which is a workaround and it will occur again soon.
Login to vcenter via ssh with root credentials and run command below
service vmware-vpxd restart
This will restart the vcenter services and it will probably work.

2) This solution is reccomended to solve issue permanently,
Login to vcenter via ssh as root
   a)    Stop the vcenter services: 
   service vmware-vpxd stop
   b)    Connect to DB
   su db2inst1
   db2 connect to vcdb
   c)    Update the DB log size
   db2 update db CFG FOR VCDB USING logprimary 16 logsecond 112 logfilsiz 8192
   d)    Type exit to exit db config
   e)    Start the vcenter services:
   service vmware-vpxd start

You are done, log file size set to higher value. That should fix the issue.
Good luck