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Simon Foster
Asked: 2011-07-04 00:48:30 +0800 CST

How to check HTTP response code of a secured website with Nagios?

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I want to create a nagios check of my secure website. All the check needs to do is login to the site with login details that I pass the script.

Does anyone know of a plugin or script that will allow me to do this?

I have tried using check_http, but I get success even if the website is redirected to an error page.

website ssl nagios http-status-code

2 Answers

  1. Best Answer

    I have tried using check_http but I get success even if the website is redirected to an error page

    This can be solved with check_http --expect. Here is the documentation from check_http --help:

    -e, --expect=STRING Comma-delimited list of strings, at least one of them is expected in the first (status) line of the server response (default: HTTP/1.) If specified skips all other status line logic (ex: 3xx, 4xx, 5xx processing)

    The following example will return an 'OK' for a 200 OK HTTP response code, but will give a critical error for a 302 redirect.

    host % check_http --expect=200
HTTP CRITICAL - Invalid HTTP response received from host: HTTP/1.0 301 OK

    For a secure website (over SSL), and authentication, also check out the check_http --ssl and the --authorization flags.

    -S, --ssl Connect via SSL. Port defaults to 443

    -a, --authorization=AUTH_PAIR Username:password on sites with basic authentication

    Or, perhaps you don't actually want to log into the system but just want to make sure that the page requires a username/password, because that username/password can become a security concern. In that case, try something like the following/ 401 is the HTTP response code for 'Unauthorized' or 'Authorization Required'-- the 401 is mandatory, the text string afterwards is optional and may say one of several different things, so I just tell Nagios to expect 401.

    check_http --expect="401"
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  2. You can create more complex checks (in the spirit of Behavior Driven Development/Monitoring) with Cucumber-Nagios.

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