sflow/mod-sflow
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Copyright (c) 2002-2010 InMon Corp. Licensed under the terms of the InMon sFlow licence: http://www.inmon.com/technology/sflowlicense.txt mod_sflow ========= A binary, random-sampling Apache module designed for: lightweight, centralized, continuous, real-time monitoring of very large and very busy web farms. Installation (from rpm) ======================= Make sure the httpd-devel package is installed (to get the "apxs" command), then try this: $ rpmbuild -ba mod_sflow.spec (You might have to copy the mod-sflow-<vesrion>.tar.gz file into whatever SOURCES directory rpmbuild looks in, and try again) rpmbuild will write the rpm into its RPMS/<arch>/ directory. To install mod-sflow on this server (and any other server with the same architecture, OS and apache version): $ rpm -Uvh mod-sflow-<version>.<os>.<arch>.rpm confirm that the mod_sflow.so file and related httpd.conf config went to the right place, then restart apache via: $ apachectl restart Installation (direct from sources) ================================== Compile and install the module into Apache's modules directory and add it to the apache httpd.conf config file by running: $ rm -f `apxs -q LIBEXECDIR`/mod_sflow.so $ apxs -c -i -a mod_sflow.c sflow_api.c Then restart Apache via: $ apachectl restart Note: the first step where the module is removed is important as a workaround for Apache bug #47951. For debug logging, set "LogLevel debug" in your apache httpd.conf file and then compile with this extra option: $ apxs -Wc,-DSFWB_DEBUG -c -i -a mod_sflow.c sflow_api.c Configuration ============= This module reads it sFlow configuration from the /etc/hsflowd.auto file that is generated automatically when you run the host-sflow daemon "hsflowd" on the same server: http://host-sflow.sourceforge.net Optionally, you can also install a handler that will return the latest counter values. This goes into your httpd.conf file, or in a separate file .../httpd/conf.d/sflow.conf: <IfModule mod_sflow.c> <Location /sflow> SetHandler sflow </Location> </IfModule> After restarting apache again, you should now be able to visit http://<server>/sflow/ and see text/plain output like this: counter method_option_count 0 counter method_get_count 34 counter method_head_count 0 counter method_post_count 0 counter method_put_count 0 counter method_delete_count 0 counter method_trace_count 0 counter method_connect_count 0 counter method_other_count 0 counter status_1XX_count 0 counter status_2XX_count 17 counter status_3XX_count 0 counter status_4XX_count 17 counter status_5XX_count 0 counter status_other_count 0 string hostname 10.0.0.119 gauge sampling_n 400 Output ====== The sFlow output goes to a UDP port on your sFlow collector host. There you can examine it using a number of tools, including the freeware "sflowtool", which can be downloaded as source code from: http://www.inmon.com/technology/sflowTools.php For example, to log all the fields in ASCII: $ sflowtool Or to log the HTTP samples in common-log-file format: $ sflowtool -H Example output from sflowtool: startDatagram ================================= datagramSourceIP 10.0.0.150 datagramSize 192 unixSecondsUTC 1294168545 datagramVersion 5 agentSubId 32576 agent 10.0.0.150 packetSequenceNo 7 sysUpTime 25000 samplesInPacket 1 startSample ---------------------- sampleType_tag 0:1 sampleType FLOWSAMPLE sampleSequenceNo 1 sourceId 3:65537 meanSkipCount 400 samplePool 124 dropEvents 0 inputPort 0 outputPort 1073741823 flowBlock_tag 0:2100 extendedType socket4 socket4_ip_protocol 6 socket4_local_ip 10.0.0.150 socket4_remote_ip 10.0.0.70 socket4_local_port 80 socket4_remote_port 63023 flowBlock_tag 0:2201 flowSampleType http http_method 2 http_protocol 1001 http_uri /membase.php http_host 10.0.0.150 http_useragent Java/1.6.0_22 http_bytes 3487 http_duration_uS 24278 http_status 200 endSample ---------------------- endDatagram ================================= startDatagram ================================= datagramSourceIP 10.0.0.150 datagramSize 116 unixSecondsUTC 1294168501 datagramVersion 5 agentSubId 32576 agent 10.0.0.150 packetSequenceNo 3 sysUpTime 42000 samplesInPacket 1 startSample ---------------------- sampleType_tag 0:2 sampleType COUNTERSSAMPLE sampleSequenceNo 3 sourceId 3:65537 counterBlock_tag 0:2201 http_method_option_count 0 http_method_get_count 113 http_method_head_count 0 http_method_post_count 0 http_method_put_count 0 http_method_delete_count 0 http_method_trace_count 0 http_methd_connect_count 0 http_method_other_count 0 http_status_1XX_count 0 http_status_2XX_count 112 http_status_3XX_count 0 http_status_4XX_count 1 http_status_5XX_count 0 http_status_other_count 0 endSample ---------------------- endDatagram ================================= AUTHORS: Neil McKee <neil.mckee@inmon.com> Ian Meyer <ianmeyer@gmail.com>
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