(WIP) Python zenoss/nagios plugin utilizing python.re, lxml.etree and libcurl intended for effective http measurement and monitoring that check_http wasn't designed to do:
- Support for Xpath: path exists and value extractions
- Support for regex: subgroups and value extractions
- Multiple request measurements
- Single error performance variable
- Easy support for hostnames, http, https and ports
- Supports Basic Auth
- Custom Header Support (cookies, host, anything)
- Custom User Agents
- Proxy support
$ apt-get instal libxml2 libxml2-dev python-dev curl libcurl python-setuptools
$ easy_install pycurl lxml
$ git clone https://github.com/kmcminn/cmon.git
$ cmon/cmon/nagios/check_cmon.py -u www.google.com
SUCCESS cMon OK | curl_error=0;; time_total=0.172406;; time_dns=0.022489;; time_connect=0.040115;; size_download=101303.0;; http_code=200;;
$ cmon/nagios/check_cmon.py -h
usage: check_cmon.py [-h] [-u URL] [-p PROXY] [-a AGENT] [-v VERBOSE]
[--header HEADER [HEADER ...]] [-t TIMEOUT] [-l LOG]
[--nosslcheck] [--cookiejar COOKIEJAR] [--name-0 NAME_0]
[--regex-0 REGEX_0] [--xpath-0 XPATH_0] [--name-1 NAME_1]
[--regex-1 REGEX_1] [--xpath-1 XPATH_1] [--name-2 NAME_2]
[--regex-2 REGEX_2] [--xpath-2 XPATH_2] [--name-3 NAME_3]
[--regex-3 REGEX_3] [--xpath-3 XPATH_3] [--name-4 NAME_4]
[--regex-4 REGEX_4] [--xpath-4 XPATH_4]
optional arguments:
-h, --help show this help message and exit
-u URL, --url URL Hostname[:port] to connect to and check. Supports ssl.
Supports strings with and without http[s]://. Https
will error if server certificate is invalid. Supports
basic http auth i.e. http://user:pass@foo.com:8080/bar
-p PROXY, --proxy PROXY
Proxy to connect through, default proxy port is 1080.
Supports protocols specifications (socks5://, etc and
and user, password and port embedding in the url
-a AGENT, --agent AGENT
Browser agent to use for query. Default = chrome23.
Codes for other User Agents: [ ie6, ie7, ie8, ie9,
ie10, chrome23, firefox15, ios5, firefox3, safari,
opera ]
-v VERBOSE, --verbose VERBOSE
Enable debugging output, currently does nothing
--header HEADER [HEADER ...]
Add one or more HTTP header(s) to the request. Headers
can be removed by passing a header with a value of '.'
-t TIMEOUT, --timeout TIMEOUT
Set a timeout for request
-l LOG, --log LOG Optionally write parse commands to a file
--nosslcheck disable ssl cert and host validation
--cookiejar COOKIEJAR
reuse a curl cookie jar FILEPATH
--name-0 NAME_0 Variable name to use when returning results in the
performance results
--regex-0 REGEX_0 String regex to test. use groups to extract int values
--xpath-0 XPATH_0 Xpath string to parse. requires http resource to
return xml
--name-1 NAME_1 Variable name to use when returning results in the
performance results
--regex-1 REGEX_1 String regex to test. use groups to extract int values
--xpath-1 XPATH_1 Xpath string to parse. requires http resource to
return xml
--name-2 NAME_2 Variable name to use when returning results in the
performance results
--regex-2 REGEX_2 String regex to test. use groups to extract int values
--xpath-2 XPATH_2 Xpath string to parse. requires http resource to
return xml
--name-3 NAME_3 Variable name to use when returning results in the
performance results
--regex-3 REGEX_3 String regex to test. use groups to extract int values
--xpath-3 XPATH_3 Xpath string to parse. requires http resource to
return xml
--name-4 NAME_4 Variable name to use when returning results in the
performance results
--regex-4 REGEX_4 String regex to test. use groups to extract int values
--xpath-4 XPATH_4 Xpath string to parse. requires http resource to
return xml
$ python
Python 2.7.3 (default, Aug 1 2012, 05:14:39)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import check_cmon as cmon
>>> results = cmon.parse('www.google.com')
>>> results
[('curl_error', 0), ('time_total', '0.122839'), ('time_dns', '0.003245'), ('time_connect', '0.017699'), ('size_download', 94817.0), ('http_code', 200)]The plugin lacks warning and critical threshold abilities. Don't have a need for them at the moment.
cmon/cmon/zenoss3 is a non-developer mode zenpack that was last tested in zenoss3. See notes for zenoss4 for using as a command datasource.
use just the plugin as a command datasource in your monitoring templates. Performance variables are GAUGE types and in zenoss the datapoint name needs to match the performance variable name in the output of the script. You'd typically install this in $ZENHOME/bin
The nagios plugin's regex and xpath logic has been well vetted in large production environments. If you see any improvements, please let me know. The code is a bit rough around the edges but largely effective for the audiences that will use and maintain it. The zenoss3 zenpack has a twisted daemon that bolts into a zenoss collector which will save you cycles on spawning a python shell with every invocation and is fairly fast.
The plugin was initially written for zenoss2. In zenoss, thresholds are handled externally to a plugin. Returnning integers and floats regardless of what goes wrong is crucial to keeping things like graphs happy and thresholds working correctly.
- Optimize for use in nagios environments, namely passing warn and crit thresholds
- Write some tests