Hello All, I had a go at adding standard sFlow instrumentation to haproxy: https://github.com/sflow/haproxy
This implements the exact same binary-logging-over-UDP export that you get from mod-sflow for apache, nginx-sflow-module, tomcat-sflow-valve, and more. It supports random 1-in-N sampling for scalability, and it is designed to be integrated with host performance counters from hsflowd, along with sFlow traffic monitoring from most network switches. (The goal being holistic end-to-end visibility). Anyone want to try it out? (If you would need it on a particular branch of haproxy, let me know.) These would be the "getting started" steps: (1) make TARGET=linux26 USE_SFLOW=yes (2) install hsflowd from http://host-sflow.sourceforge.net (3) edit /etc/hsflowd.conf to set DNSSD=off, configure manual collector for "collector { ip = 127.0.0.1 } ", and add a line with "sampling.http = 1" (4) /etc/init.d/hsflowd start (5) download sflowtool sources from http://www.inmon.com/technology/sflowTools.php (a simple tool for ASCIIfying the binary feed) (6) configure; make; make install (7) run "sflowtool" (8) generate some requests through haproxy (9) you should see output in sflowtool looking something like this: extendedType proxy_socket4 proxy_socket4_ip_protocol 6 proxy_socket4_local_ip 0.0.0.0 proxy_socket4_remote_ip 10.0.0.160 proxy_socket4_local_port 0 proxy_socket4_remote_port 80 flowBlock_tag 0:2100 extendedType socket4 socket4_ip_protocol 6 socket4_local_ip 0.0.0.0 socket4_remote_ip 10.1.3.2 socket4_local_port 0 socket4_remote_port 62902 flowBlock_tag 0:2206 flowSampleType http http_method 2 http_protocol 1001 http_uri GET /inmsf/Widget?id=base.categorytrend.1&height=200&width=320&ms=1362731388006 HTTP/1.1 http_host 10.0.0.153:8080 http_referrer http://10.0.0.153:8080/inmsf/Home?action=widgets http_useragent Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:19.0) Gecko/20100101 Firefox/19.0 http_mimetype image/png http_request_bytes 11292 http_bytes 481 http_duration_uS 1434000 http_status 200 (10) Ganglia will accept this feed and display the host and http counters. Other sFlow collectors are listed here: http://sflow.org/products/collectors.php (Though not all of these will recognize the sFlow-HTTP structures). More background and documentation here: http://blog.sflow.com/search?q=HTTP Neil
