Metrics with Ganglia

gareth rushgrove | morethanseven.net

Collecting MetricsWith Ganglia and Friends

Cambridge Geek Night 28th March 2011

http://www.flickr.com/photos/memestate/45986749

http://flickr.com/photos/psd/102332391/


Gareth Rushgrove


Work at FreeAgent


freeagentcentral.com

http://opencoffee.ning.com


Blog at morethanseven.net


Curate devopsweekly.com


Covering (Business Version)


- Capacity planning metrics

- Metrics for your application- Business analytics

- Having everything in one place

Covering (Tech Version)


- Ganglia Store metrics and view graphs

- Logster Get log files into Ganglia

- Gmetric Get anything into Ganglia

- Syslog Using Loggly to view individual log items

Everyone Uses Something Like?


Use Something Like This Too


What is Ganglia?


Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids.ganglia.sourceforge.net

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Example: vagrantbox.es


Load Averages


CPU


Aggregate Graphs


Across Entire Cluster


Predicting When Your System Will Fail


A strategy for anticipating future workloads of your computers, with the aim of creating a computing environment that can handle future workloadIBM

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Disk Space


Monitoring Your Application


86.26.7.33 - - [26/Mar/2011:20:39:52 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.1" 200 2081 "-" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_7; en-us) AppleWebKit/533.20.25 (KHTML, like Gecko) Version/5.0.4 Safari/533.20.27"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5466 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5466 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5466 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5466 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5466 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5466 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5466 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5970 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5466 "-" "FunkLoad/1.14.0"86.26.7.33 - - [26/Mar/2011:20:39:53 +0000] "GET / HTTP/1.0" 200 5466 "-" "FunkLoad/1.14.0"

Web Server Logs


Logster from Etsy


Tail a log file and filter each line to generate metrics that can be sent tocommon monitoring packages.

Options: -p METRIC_PREFIX, --metric-prefix=METRIC_PREFIX Add prefix to all published metrics. This is for people that may multiple instances of same service on same host. --gmetric-options=GMETRIC_OPTIONS Options to pass to gmetric such as -d 180 -c /etc/ganglia/gmond.conf (default). These are passed directly to gmetric. --graphite-host=GRAPHITE_HOST Hostname and port for Graphite collector, e.g. graphite.example.com:2003 -s STATE_DIR, --state-dir=STATE_DIR Where to store the logtail state file. Default location /var/run -d, --dry-run Parse the log file but send stats to standard output. -D, --debug Provide more verbose logging for debugging.

Logster


logster SampleGangliaLogster /../access.log

Logster Command Line


HTTP Responses with a 2xx Status Code


The Ganglia Metric Client (gmetric) announces a metricon the list of defined send channels defined in a configuration file

Usage: gmetric [OPTIONS]... -V, --version Print version and exit -c, --conf=STRING The configuration file to use for finding send channels (default='/etc/ganglia/gmond.conf') -n, --name=STRING Name of the metric -v, --value=STRING Value of the metric -t, --type=STRING Either string|int8|uint8|int16|uint16|int32|uint32|float|double -u, --units=STRING Unit of measure for the value e.g. Kilobytes, Celcius (default='') -s, --slope=STRING Either zero|positive|negative|both (default='both') -x, --tmax=INT The maximum time in seconds between gmetric calls (default='60') -d, --dmax=INT The lifetime in seconds of this metric (default='0') -S, --spoof=STRING IP address and name of host/device (colon separated) we are spoofing (default='') -H, --heartbeat spoof a heartbeat message (use with spoof option)

Gmetric


Gmetric Scripts for Common Applications


gmetric -n sales -v 200 -t float

Gmetric Command Line


Our Custom Metric in Ganglia


import subprocess

from bottle import route, run, abort, default_app

@route('/:name/:value')def index(name, value): try: cmd = 'gmetric -n %s -v %s -t float' % (name, value) subprocess.check_call( cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE) return "Success: %s" % cmd except subprocess.CalledProcessError: abort(500, "Error")

app = default_app()

Gmetric HTTP Interface


http://../sales/200

Gmetric URL


import subprocessimport SocketServer

class GmetricTCPHandler(SocketServer.BaseRequestHandler):

def handle(self): self.data = self.request.recv(1024).strip() items = self.data.split(' ') try: cmd = 'gmetric -n %s -v %s -t float' % (items[0], items[1]) subprocess.check_call( cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE) return "Success: %s" % cmd except Exception: return "Error"

if __name__ == "__main__": HOST, PORT = "0.0.0.0", 8001 server = SocketServer.TCPServer((HOST, PORT), GmetricTCPHandler) server.serve_forever()

Gmetric TCP Interface


sales 200

Gmetric TCP


Syslog


Syslog is a standard for logging program messages. It allows separation of the software that generates messages from the system that stores them and the software that reports and analyzes them.Wikipedia

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Loggly - Logging as a Service


View logs


Logstash


Graylog2


Other Things You Could Monitor


- Database table sizes

- Cache hits- Time taken for test runs

- Codebase size

- Signups, sales, subscriptions

- Twitter followers

What Next?


- Wikipedia http://ganglia.wikimedia.org/

- Install Ganglia deb and rpm packages available

- Add system metrics web servers, databases

- Add business metrics users, sales, tweets

- Try Loggly or at least investigate syslog


Reading

CBGN11

2 months free on FreeAgent




Questions?

gareth rushgrove | morethanseven.net http://flickr.com/photos/psd/102332391/



Metrics with Ganglia

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