Sample HAProxy config with logging.

haproxy.config

global
    pidfile /var/run/haproxy.pid
    log 127.0.0.1 local0 info
    ulimit-n        65536

defaults
    mode http

    clitimeout          600000   # maximum inactivity time on the client side
    srvtimeout          600000   # maximum inactivity time on the server side
    timeout connect     8000     # maximum time to wait for a connection attempt to a server to succeed

    stats enable
    stats auth		admin:password
    stats uri		/monitor
    stats refresh	5s
    option httpchk	GET /status
    retries		5
    option redispatch
    errorfile 503 /path/to/503.text.file

    balance roundrobin	# each server is used in turns, according to assigned weight

frontend http
    bind :80
    monitor-uri   /haproxy  # end point to monitor HAProxy status (returns 200)

    acl api1 path_reg ^/api1/?
    acl api2 path_reg ^/api2/?

    use_backend api1 if api1
    use_backend api2 if api2

backend api1
    # option httpclose
    server srv0 127.0.0.1:9000 weight 1 maxconn 100 check inter 4000
    server srv1 127.0.0.1:9001 weight 1 maxconn 100 check inter 4000
    server srv2 127.0.0.1:9002 weight 1 maxconn 100 check inter 4000

backend api2
    option httpclose
    server srv01 127.0.0.1:9003 weight 1 maxconn 50 check inter 4000

haproxy.rotate

# .. otherwise consider putting these two in /etc/rsyslog.conf instead:
$ModLoad imudp
$UDPServerAddress 127.0.0.1
$UDPServerRun 514
# ..and in any case, put these two in /etc/rsyslog.d/49-haproxy.conf:
local1.* -/var/log/haproxy_1.log
& ~
# & ~ means not to put what matched in the above line anywhere else for the rest of the rules
# http://serverfault.com/questions/214312/how-to-keep-haproxy-log-messages-out-of-var-log-syslog
# Don’t forget to tweak the debug level in /etc/haproxy/haproxy.conf.




# Now do a quick:
>>> restart rsyslog
# And you’re done. Check for HAProxy logs in:
>>> tail -f /var/log/haproxy*.log




# Maybe set up a logrotate right away in "/etc/logrotate.d/haproxy":
/var/log/haproxy*.log
{
    rotate 4
    weekly
    missingok
    notifempty
    compress
    delaycompress
    sharedscripts
    postrotate
        reload rsyslog >/dev/null 2>&1 || true
    endscript
}