When I start haproxy server, it always starts a random UDP port. What is this UDP port used to ? And can i set it to a static port?
Below is the haproxy.cfg file content:
global
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
stats socket /var/lib/haproxy/stats
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
frontend main *:5000
acl url_static path_beg -i /static /images /javascript
/stylesheets
acl url_static path_end -i .jpg .gif .png .css .js
use_backend static if url_static
default_backend app
backend static
balance roundrobin
server static 127.0.0.1:4331 check
backend app
balance roundrobin
server app1 127.0.0.1:5001 check
server app2 127.0.0.1:5002 check
server app3 127.0.0.1:5003 check
server app4 127.0.0.1:5004 check
And below is the netstat result;
# netstat -anp| grep udp | grep haproxy
udp 0 0 0.0.0.0:43367 0.0.0.0:* 3067/haproxy
Thanks a lot!
I have found out the port's purpose, after config the log section, haproxy start a random udp port to connect syslog udp port 514. I think it is for performance that it starts the udp port immediately after process started.