[stunnel-users] Redis with stunnel, need to reset a client connection if the remote server drops

Michal Trojnara Michal.Trojnara at mirt.net
Mon Apr 20 20:58:15 CEST 2015


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Cocytus wrote:
> If the remote EC2 node goes dark for a bit (ie: reboot), the local 
> stunnel client will reconnect, however the internal process which
> is establishing its connection to the local stunnel client does not
> get disconnected and therefore doesn't know that redis became
> unavailable and needs to re-subscribe to the redis stream. I need
> to invalidate the established session when the remote reconnects.

Do you see anything in your log files indicating that stunnel gets
notified about the peer being disconnected?  If not then stunnel does
not make any difference for you.  You would bump into the same issue
without stunnel.

Either way, you need some kind of keepalive.  It may be implemented
either at the application level by periodically sending a command
(some no-op) to your redis server, or at the TCP level.  Stunnel can
help you with it.  The stunnel.conf option is:
    socket = r:SO_KEEPALIVE=1

Mike
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