<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <meta name="Generator" content="Microsoft Word 14 (filtered medium)"> <style></style> </head> <body lang="EN-US" link="blue" vlink="purple"> <div class="WordSection1"> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">That depends on your definition of dynamically. I would like to see it be able to add/remove hosts without requiring a restart of the service. I currently use puppet, but it’s still just updating files and then you have to restart to pickup the changes.<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dan<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> ranjib dey [mailto:dey.ranjib@gmail.com] <br> <b>Sent:</b> Friday, February 10, 2012 11:42 PM<br> <b>To:</b> Nagios Users List<br> <b>Subject:</b> Re: [Nagios-users] Dynamically add/remove hosts on Nagios<o:p></o:p></span></p> <p class="MsoNormal"><o:p> </o:p></p> <p>Have you considered using a configuration management tool like chef or puppet ? They address the exact usecase <o:p></o:p></p> <div> <p class="MsoNormal">On Feb 10, 2012 7:08 AM, "Felipe Cecagno" <<a href="mailto:fcecagno@gmail.com">fcecagno@gmail.com</a>> wrote:<o:p></o:p></p> <p class="MsoNormal">Hi everybody,<o:p></o:p></p> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">This is the first time I'm posting on this mailing list, so I'm sorry if my question was already discussed here - I tried to find information about it on the mailing list and also on Nagios documentation + googling, but couldn't find it.<o:p></o:p></p> </div> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">Well, I'm setting up Nagios to monitor a group of servers in a cloud environment. I decided to use passive checks, so I will have one Nagios central monitor and all servers push statistics to Nagios using NSCA. Everything is OK so far.<o:p></o:p></p> </div> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">The problem is that I want to add and remove instances dynamically, I don't want to manually modify hosts.cfg on the central each time I change my infrastructure. So my idea was that when a new instance gets up, it will send to Nagios something like (always using NSCA):<o:p></o:p></p> </div> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">"localhost Server UP 0 <new instance IP>"<o:p></o:p></p> </div> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">On Nagios I would create a new service on localhost to handle this passive check.<o:p></o:p></p> </div> <div> <p class="MsoNormal">I've created a Python script (that uses pynag) to modify the hosts.cfg file in order to add and remove host definitions. When Nagios receives this passive check, I would call the script to modify the hosts definition files, and a cron job would execute every minute to look for modifications on hosts.cfg and make Nagios reload the definition files.<o:p></o:p></p> </div> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">My doubts are:<o:p></o:p></p> </div> <div> <p class="MsoNormal">- is there a smarter way to do that (dynamically add and remove hosts from Nagios)?<o:p></o:p></p> </div> <div> <p class="MsoNormal">- since my "Server UP" service uses passive checks only, how do I make Nagios call my script to modify hosts.cfg every time it receives the passive check?<o:p></o:p></p> </div> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">Any thoughts/suggestions would be appreciated. :)<o:p></o:p></p> </div> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">Thank you in advance,<o:p></o:p></p> </div> <div> <p class="MsoNormal">Best regards,<br clear="all"> <o:p></o:p></p> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">--<o:p></o:p></p> </div> <p class="MsoNormal"> Felipe Cecagno<o:p></o:p></p> <div> <p class="MsoNormal"> Mconf Development Team<o:p></o:p></p> </div> <div> <p class="MsoNormal"> <a href="https://mconf.org/" target="_blank">https://mconf.org</a><o:p></o:p></p> </div> <p class="MsoNormal"><o:p> </o:p></p> </div> <p class="MsoNormal"><br> ------------------------------------------------------------------------------<br> Virtualization & Cloud Management Using Capacity Planning<br> Cloud computing makes use of virtualization - but cloud computing<br> also focuses on allowing computing to be delivered as a service.<br> <a href="http://www.accelacomm.com/jaw/sfnl/114/51521223/" target="_blank">http://www.accelacomm.com/jaw/sfnl/114/51521223/</a><br> _______________________________________________<br> Nagios-users mailing list<br> <a href="mailto:Nagios-users@lists.sourceforge.net">Nagios-users@lists.sourceforge.net</a><br> <a href="https://lists.sourceforge.net/lists/listinfo/nagios-users" target="_blank">https://lists.sourceforge.net/lists/listinfo/nagios-users</a><br> ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue.<br> ::: Messages without supporting info will risk being sent to /dev/null<o:p></o:p></p> </div> </div> </body> </html>