I see the following errors in the error_log file of my VDS
[Date] [notice] caught SIGTERM, shutting down
[Date] [notice] Apache/1.3.26 (Unix) configured -- resuming normal operations
[Date] [notice] Accept mutex: fcntl (Default: fcntl)
[Date] [warn] (95)Operation not supported: setsockopt: (TCP_NODELAY)
This is a regular message in the error_log for name-based VDS.
When a name-based VDS is not receiving any http request, its apache will go down to reduce system usage. It will start again in the first browser request. This is a regular message and there is no problem with these VDSs.