Hi,
I have 2 questions about a haproxy setup I configured.
This is the setup:
LB server (haproxy 1.4.20, debian squeeze 64-bit) in http mode, forwarding
requests to a single nginx web server, that resides on a different machine.
I'll paste the haproxy config at the end of this message.
1. Benchmarking:
When doing some benchmarking with 'ab' or 'siege', for a small (2 bytes,
single char) file:
ab -n 10000 -c 40 http://lb/test.html
VS
ab -n 10000 -c 40 http://web-01/test.html
web-01 directly gets 6000-6500 requests/sec. haproxy->nginx gets 3000
requests/sec.
When using ab -k to enable keepalives, nginx is getting >12,000
requests/sec, and haproxy gets around 6000-7000 requests/sec.
I wanted to ask if the x2 difference is normal? I tried to remove the ACL
for checking if the path ends with PHP, the results were not different.
2. As you can see, I separate the dynamic (PHP) requests from other
(static) requests.
a. Is this the way to do it (path_end .php) ?
b. I limit the number of connections to the dynamic backend server(s).
I just set it according to the number of FastCGI PHP processes available on
that machine. How do I check/benchmark what is the limit for the static
backend? Or is it not needed?
My nginx config is quite trivial.
Here is my haproxy config:
global
daemon
user haproxy
group proxy
log 127.0.0.1 local0
log-send-hostname
maxconn 20000
defaults
mode http
log global
retries 2
timeout client 90s # Client and server timeout must match the
longest.
timeout server 90s # Time we may wait for a response from the
server.
timeout queue 90s # Don't queue requests too long if saturated.
timeout connect 4s # There's no reason to change this one.
option abortonclose # Close aborted connections if they still didn't
reach a backend (e.g still in a queue).
option http-server-close # Enable HTTP connection closing on the server
(backend) side.
frontend public
bind :80
maxconn 19500
option httplog
# Add the backend server ID as a response header
rspadd X-Backend:\ 0 if { srv_id 1 }
rspadd X-Backend:\ 1 if { srv_id 2 }
# Use dynamic backend if the request path ends with .php, fallback to the
default static otherwise
acl url_dynamic path_end .php
use_backend dynamic if url_dynamic
default_backend static
backend dynamic
balance roundrobin
option forwardfor except 127.0.0.1 # Set the client IP in
X-Forwarded-For except for when the client IP is loopback (nginx SSL
termination).
server web web:80 maxconn 50 check disabled
server web-01 web-01:80 maxconn 50 check
backend static
balance roundrobin
server web web:80 check disabled
server web-01 web-01:80 check
# Enable the stats page on a dedicated port (8888)
listen stats
# Uncomment 'disabled' below to disable the stats page
# disabled
bind :8888
stats uri /
stats realm HAProxy\ Statistics
stats auth admin:mypassword
Thanks!
Bar.
