guys,
we have customized the 503 and added google analytcs on it to know
how many errors we get. So far we are seeing few errors and I would
like to know if this is because backed servers are full or what.
Also I would like to know if you have any advice for the haproxy
configuration based on the hardware we have because.
this is our setup:
we have 2 virtual servers running over a XEN host with apache 2.3 with
1gb of RAM each
apaches are compiled with prefork and this is the current configuration:
StartServers 8
MinSpareServers 5
MaxSpareServers 20
ServerLimit 256
MaxClients 256
MaxRequestsPerChild 4000
haproxy configuration:
Pentium D930 2gb of RAM
global
maxconn 15000 # Total Max Connections.
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
daemon
nbproc 1 # Number of processes
user haproxy
group haproxy
stats socket /var/run/haproxy.sock mode 666
defaults
log global
mode tcp
clitimeout 60000
srvtimeout 18000000
contimeout 15000
retries 3
option redispatch
errorfile 503 /etc/haproxy/errorfiles/503sorry.html
listen tracking ZZZ.ZZZ.ZZZ.ZZZ:80
balance roundrobin
mode http
option forwardfor
option httplog
server www3-tracking XXX.XXX.XXX.XXX weight 1 maxconn 240 check
server www2-tracking YYY.YYY.YYY.YYY weight 1 maxconn 240 check
listen load_balanced_http AAA.AAA.AAA.AAA:80
balance roundrobin
mode http
option forwardfor
option httplog
server www3-http XXX.XXX.XXX.XXX weight 1 maxconn 240 check
server www2-http YYY.YYY.YYY.YYY weight 1 maxconn 240 check
listen load_balanced_https AAA.AAA.AAA.AAA:443
balance source
option ssl-hello-chk
mode tcp
option tcplog
server www2-https YYY.YYY.YYY.YYY weight 1 maxconn 240 check
server www3-https XXX.XXX.XXX.XXX weight 1 maxconn 240 check
as you saw the three frontends shares the same backends but the
highest traffic is comming form the "load_balanced_http" frontend. all
backends have 240 as connection limit (pretty next to the "MaxClients"
values on each apache)
Do you think this is a right configuration? I'm a little worried about
these errors because I can't see if the apaches reach the connection
limit and haproxy queue (and hold) the connections until any backed
its free or drops the connection
thank you
