Hi.
I've got such a scheme on the shared hosting:
+- apache_pool1
|
apache_fe -> haproxy -|- apache_pool2
|
+- apache_pool3
...
haproxy.conf:
====
defaults
log 127.0.0.1 local1 notice
mode http
retries 10
maxconn 2000
timeout client 50000
timeout connect 5000
timeout server 5m
balance roundrobin
option forwardfor except 111.111.111.111/32
stats enable
stats uri /haproxy-1gb?stats
listen backend_pool1 111.111.111.111:9099
option httplog
log 127.0.0.1 local2
cookie SERVERID
option httpchk
capture request header Host len 40
server pool1 111.111.111.111:8099 weight 256 cookie pool1 check inter 800
fall 3 rise 2 maxconn 500
server pool2 111.111.111.111:8100 weight 1 cookie pool2 check inter 800
fall 3 rise 2 maxconn 250
server pool3 111.111.111.111:8101 backup
====
Unfortunately, I can't understand myself the cause of these errors:
1. log from apache_fe:
===
217.212.230.49 - - [12/Jul/2011:22:28:02 +0400] "GET
/?option=com_sobi2&sobi2Task=sobi2Details&sobi2Id=80&default=80&Itemid=7
HTTP/1.1" 502 107
"http://clientvhost.com/index.php?option=com_sobi2&Itemid=7&catid=1529";
"Opera/9.80 (J2ME/MIDP; Opera Mini/4.3.24214/25.669; U; ru) Presto/2.5.25
Version/10.54"
===
2. haproxy access.log:
Jul 12 22:28:04 l19 haproxy_aux2_pools[4944]: 111.111.111.111:42001
[12/Jul/2011:22:28:02.281] backend_pool1 backend_pool1/pool1 0/0/0/-1/2084 502
204 - - SH-- 24/6/6/6/0 0/0 {clientvhost.com:9099} "GET
/?option=com_sobi2&sobi2Task=sobi2Details&sobi2Id=80&default=80&Itemid=7
HTTP/1.1"
3. apache_pool1:
10 217.212.230.49 - - [12/Jul/2011:22:28:19 +0400] www.clientvhost.com "GET
/?option=com_sobi2&sobi2Task=sobi2Details&sobi2Id=20&default=20&Itemid=7
HTTP/1.1" 200 425885
"http://clientvhost.com/index.php?option=com_sobi2&Itemid=7&catid=1529";
"Opera/9.80 (J2ME/MIDP; Opera Mini/4.3.24214/25.669; U; ru) Presto/2.5.25
Version/10.54"
there are few of them (taking into account 10k sites on the server),
but still. Moreover users sometimes complain on such problems.
Right from the log you can see that the request has been processed
normally (normal size of a response, 425885 bytes - apache_pool1 log)
for 10 seconds , but haproxy somehow returned to the client 502-th error.
"show errors" doesn't show anything.
Does anyone know what else can be added into the options of haproxy
logging? Or maybe somebody just knows how this can be fixed.
Thank you in advance.
--
BRGDS. Alexey Vlasov.
