?
Solved

How to monitor web sites properly via Nagios

Posted on 2010-08-19
6
Medium Priority
?
667 Views
Last Modified: 2012-05-10
Hi Experts,

We have an issue with Nagios at the moment attempting to monitor Web sites.

Nagios reports as ok if port 80 is open - if the site is parked, Nagios wouldn't know.

Is there a better solution to check if the website is down or changed?

Can you monitor a particular picture or text in the site?

Perhaps a more powerful plugin is available?

Please help...
Thanks!
0
Comment
Question by:bossagroup
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 12

Assisted Solution

by:hfraser
hfraser earned 1332 total points
ID: 33481765
The check_http plugin allows you to search the content for a specific string (--string) or regular expression (--regex or --eregi). If the site is a secure site (SSL), you can check for a valid certificate. Finally, you can check to see if the page is re-directed.
0
 

Author Comment

by:bossagroup
ID: 33481774
so can a specific string be a image on the webpage?

If so can you please show me the command to use?
0
 
LVL 12

Assisted Solution

by:hfraser
hfraser earned 1332 total points
ID: 33482090
The check_http command can look for any string in the content of a web page. For example, the command:

check_http --string "Welcome to my site" mywebsite.,com -u welcome.html

would check for the string "Welcome to my web site" on http://mywebsite.com/welcome.html

This plugin is designed to search the entire content of a web page (including mime-encoded image files) for a specific string, but not well suited to tell if the web page has changed in any way. If you want to do this, you could do a simple check to see if the page size has changed (check_http -m min:max) or write a simple script to compare an md5 hash of the image file.

0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
LVL 9

Accepted Solution

by:
jeremycrussell earned 668 total points
ID: 33485605
To add to hfraser's response... To check for an image, just use the --string reponse and check for the image path/name

i.e  check_http -H host --string "/path/to/images/image.jpg"
0
 
LVL 12

Expert Comment

by:hfraser
ID: 33488140
Checking for a change to a link to an included image file isn't the same as checking for a change to the image file itself (ie. it's a different image). But it depends upon what you want to check.
0
 

Author Closing Comment

by:bossagroup
ID: 33527534
Thanks guys,

Exactly what I was after!
0

Featured Post

Threat Trends for MSPs to Watch

See the findings.
Despite its humble beginnings, phishing has come a long way since those first crudely constructed emails. Today, phishing sites can appear and disappear in the length of a coffee break, and it takes more than a little know-how to keep your clients secure.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Is your computer hacked? learn how to detect and delete malware in your PC
David Varnum recently wrote up his impressions of PRTG, based on a presentation by my colleague Christian at Tech Field Day at VMworld in Barcelona. Thanks David, for your detailed and honest evaluation!
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…
Suggested Courses
Course of the Month15 days, 10 hours left to enroll

741 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question