[ic] Verisign double, triple charges, sendmail and pgp failing- SOLVED

[interchange-users@interchange.redhat.com (Orko)]

My sincerest thanks for all that Ron and Mike accomplished in the last
week.  My CEO thanks you, as well.

-- orko

On Wed, 2002-03-06 at 21:40, Ron Phipps wrote:
> Mike over the last few weeks worked closely with myself and Orko from
> the list to figure out and fix the problem I posted about back in
> September.  This problem caused PGP and Sendmail to fail abnormally.
> The problem also caused duplicate charges in verisign as well as single
> charges with no order being stored in IC.  This problem was not seen in
> IC 4.6.x but reared its ugly head in IC 4.8.x.
> 
> Orko graciously allowed us to send him fixes to be tested on his live
> server.  We went through several iterations of applying patches,
> changing process limits and adding logging to try and figure out what
> was going on.  Originally Mike suspected it was a problem with the
> Autouse setup in bin/interchange which changed from 4.6.x to 4.8.x for
> the Order (encrypt, send email, chare card) functions.  We were very
> excited to see this difference only to find out it was not the cause :(
> 
> Mike pressed on and went on to look at the per user process limits.
> After failing to find any messages that the limit was being hit and
> being unable to raise the maximum Mike decided we should move on.
> 
> One of the last things we tried was to set MaxServers to 0.  This change
> forces Interchange to not use signals to determine how many servers are
> running.  Mike's suspicion was that a well known problem with Perl
> signal handling was causing these external programs to fail.  After
> running this setting on a live server for two days we saw no orders with
> the problem (which was unheard for this server!).  Mike then asked us to
> try rpc mode with MaxServers set to 0.  The reasoning behind this was
> that a server could spin out of control in low or high traffic mode if
> MaxServers is set to 0 but in rpc mode this is not an issue.  Orko ran
> MaxServers 0 and RPC mode for another day without any problem orders
> occurring.
> 
> It's a mystery why this signal handling does not work in the current
> scenario and Mike came to the conclusion that this is the fix if you are
> experiencing the problems described above.  Please make the following
> change to interchange.cfg (notice the new MaxServers setting in the rpc
> mode):
> 
> Variable TRAFFIC rpc
> 
> ifdef TRAFFIC =~ /rpc/i
> Message RPC traffic settings.
> PreFork             Yes
> StartServers        5   
> MaxRequestsPerChild 100
> HouseKeeping        2
> PIDcheck            120
> MaxServers          0
> endif
> 
> Thank you to Orko for providing his live server for testing and to Mike
> for sticking with us until the problem was solved.
> 
> -Ron
> 
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