Kernel info:
root@lb1:/etc/haproxy# uname -a
Linux lb1 3.13.0-52-generic #86-Ubuntu SMP Mon May 4 04:32:59 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux
Here's the haproxy version output:
root@lb1:/etc/haproxy# haproxy -vv
HA-Proxy version 1.5.12 2015/05/02
Copyright 2000-2015 Willy Tarreau <w...@1wt.eu>
Build options :
TARGET = linux2628
CPU = native
CC = gcc
CFLAGS = -O2 -march=native -g -fno-strict-aliasing
OPTIONS = USE_ZLIB=1 USE_OPENSSL=1 USE_PCRE= USE_PCRE_JIT=1
Default settings :
maxconn = 2000, bufsize = 16384, maxrewrite = 8192, maxpollevents = 200
Encrypted password support via crypt(3): yes
Built with zlib version : 1.2.8
Compression algorithms supported : identity, deflate, gzip
Built with OpenSSL version : OpenSSL 1.0.2j 26 Sep 2016
Running on OpenSSL version : OpenSSL 1.0.2j 26 Sep 2016
OpenSSL library supports TLS extensions : yes
OpenSSL library supports SNI : yes
OpenSSL library supports prefer-server-ciphers : yes
Built with PCRE version : 8.31 2012-07-06
PCRE library supports JIT : no (libpcre build without JIT?)
Built with transparent proxy support using: IP_TRANSPARENT
IPV6_TRANSPARENT IP_FREEBIND
Available polling systems :
epoll : pref=300, test result OK
poll : pref=200, test result OK
select : pref=150, test result OK
Total: 3 (3 usable), will use epoll.
The configuration I had is with a backend that has two servers, one of
them tagged as backup. This is the actual config:
backend be-cdn-9000
description Back end for the thumbs CDN
cookie MSDSRVHA insert indirect nocache
server planet 10.100.2.123:9000 weight 100 cookie planet track
chk-cdn-9000/planet
server hollywood 10.100.2.124:9000 weight 100 backup cookie
hollywood track chk-cdn-9000/hollywood
My check interval is 9990 milliseconds and the check timeout is 10 seconds.
I did not do any precise timing, but it seems to take about ten seconds
between the primary server going down and the backup server changing to
active, and during that time, clients get "no server available" errors.
It is my expectation that as soon as the primary server goes down,
haproxy will promote the backup server(s) with the highest weight to
active and send requests there.
I know that I'm running an out of date version and can't expect any
changes in 1.5.x.
As a workaround, I have removed the "backup" keyword. For this backend
that's an acceptable solution, but I am using that configuration
elsewhere in cases where I only want the traffic to go to one server as
long as that server is up.
Thanks,
Shawn
