XR 'freezes'

[pvdleek]

I'm experiencing an annoying issue with XR where it appears to freeze. The webinterface shows that all backends are available, it's even distributing users across the backends. But in the browser all you see is an "Internal server error".
I've checked everything during that problem, the backends are fine, heartbeat is working fine. Restarting XR immediately solves the problem.

The load is not extremely high the moment the problem occurs, the webinterface shows about 5 or 6 sessions being distributed.

The messages log only shows this every now and then (not always related to the problem):
Mar 11 13:56:35 vps263 kernel: [73276.685295] possible SYN flooding on port 80. Sending cookies.

-bash-3.2# xr -V
XR version : 2.62
Written by : Karel Kubat <karel@kubat.nl>
Maintained by : Karel Kubat <karel@kubat.nl>
Primary site : http://crossroads.e-tunity.com
Compiled with : /usr/bin/g++
Optimization : -O3
System : Linux
Libraries : -L/usr/lib -lnsl -lpthread -lm
Type sizes : ssize_t=4, int=4, long=4, double=8, ptr=4
getopt.h : present
INADDR_NONE : present
getopt_long() : present
inet_aton() : present
strnstr() : absent

-bash-3.2# ps ax | grep xr
14046 ? Rl 0:00 xr-web_http --server http:0:80 --web-interface 0:8001 --dispatch-mode lax-stored-ip:600 --max-connections 300 --checkup-interval 60 --time-interval 3 --hard-maxconnrate 200 --soft-maxconnrate 100 --defer-time 1000000 --close-sockets-fast --add-x-forwarded-for --host-match . --url-match . --backend-check get:194.145.200.82:80/sanity_check.php --backend 194.145.200.82:80:0:1 --backend-check get:194.145.200.98:80/sanity_check.php --backend 194.145.200.98:80:0:1 --backend-check get:194.145.200.99:80/sanity_check.php --backend 194.145.200.99:80:0:1 --backend-check get:194.145.200.101:80/sanity_check.php --backend 194.145.200.101:80:0:1 --backend-check get:194.145.200.251:80/sanity_check.php --backend 194.145.200.251:80:0:1 --backend-check get:194.145.200.252:80/sanity_check.php --backend 194.145.200.252:80:0:1

[pvdleek]

* Ding dong *

[pvdleek]

Again a whole night down due to a freezing XR. I have already got "xrctl force" running each minute, which is basically a ridiculous workaround, but even that doesn't work because the service is still running (but only serving 500 error pages).
I'm gonna start searching for alternatives now, for I haven't had any response for 9 days now

[Rene]

Dear Peter, sorry we weren't able to reply in a timely fashion on your request. Normally we're very keen picking up support requests as you can see on all other topics and I've no idea why we've missed out on this one. If we can be of any further assistance please let us know.

[pvdleek]

No thanks, in the meantime I started using Squid load balancing. I haven't had a single minute of downtime due to Squid.

[Karel]

Hi,

So sorry for missing this post... while the fix would've been pretty simple I think. There was a bug in version 2.62 that's fixed now. Well if Squid works for you then you're all set to go, good luck! If we can help in any other way, let me know.

Karel