Not a direct answer to your question, but you may want to try an 
alternative approach I used for testing.

You can leave the OSSEC agent running, but simply use a separate process to 
pull IIS logs from Azure and append it line by line to the monitored local 
file. 


On Tuesday, March 4, 2014 6:58:16 AM UTC-8, James Whittington wrote:
>
> How does OSSEC keep track of a logfile and what events have not been seen 
> yet? 
> I am pulling down hourly based IIS logs every 15 minutes from Windows 
> Azure 
> Blob storage to flat files that are identical to native IIS logs. 
>
> It appears OSSEC was putting a file lock on the IIS log being read 
> (preventing it from being overwritten) so I am stopping the OSSEC agent, 
> pulling the latest log then starting the OSSEC agent every 15 minutes. 
>
> OSSEC says it is analyzing the file but I've yet to see any events 
> generated 
> from that log source. 
>
> On a OSSEC restart 
> - will OSSEC read where is left off in the file 
> - or is it somehow listening for only new data being written to the log? 
>
> I don't think it's possible to run an OSSEC agent in the Azure cloud, at 
> least I haven't seen anyone say they have been able to do it, but I would 
> still like to use OSSEC to watch over some of the web applications we have 
> in the cloud. 
>
> Thanks, 
>
> James Whittington 
>
>

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