Hello,
First my system information is:
OS - Debian Etch
SA version - 3.2.3
I am trying to use SpamAssassin in the following setup to accomplish
load balancing:
I have 3 testing servers with spamd installed and configured to accept
network connections from a whole /24 network.
On an another testing machine I invoke spamc with the following options:
cat test-email.txt | spamc -c -t 120 -p 783 -H -d
server1.com,server2.com,server3.com
In that scenario everything is ok and works as expected.
The spamc client connects to a random server from the round robin pool
and receives an answer with the spam score for the email from every server.
Ok then I tried to make some trouble.
On server1.com I stopped the Spamd so there was no service listening on
port 783.
On server2.com I added a firewall rule using iptables to DROP requests
to port 783.
On server3.com I left the Spamd working without any intervention.
I executed again the spamc command written above several times and
everything was perfect.
Depending on which server is accessed first from the spamc, sooner or
later I always received an answer from server3.com (the only server that
is operational).
I reverted all the servers back to fully operational mode and decided to
check what will happen if one of the servers is heavily loaded and don't
respond to the spamc request in the timeout limit.
On server3.com I executed:
killall -STOP spamd
and the effect was that the server was with port 783 open and you can
establish a successful TCP connection but the server doesn't return
anything to the spamc client.
So when I invoked the spamc again and it accessed server3.com the spamc
waited for response from the server and when it didn't received one for
120 seconds it returned spam score 0/0, instead of connecting to another
server from the pool.
Could you tell me is that behavior indented and if not what can I do to
make the spamc to connect to another server in this scenario?
Thank You
Iavor Stoev
