Re: [Xen-users] Monitoring Xen via Nagios

[Jason Long <hack3rcon@xxxxxxxxx>]

On Sunday, July 17, 2016 10:13 AM, Adam Goryachev 
<mailinglists@xxxxxxxxxxxxxxxxxxxxxx> wrote:


On 17/07/2016 14:56, Jason Long wrote:
> I installed NRPE and my problem is that I don't know how can I define my 
> server and... to Nagios.
>

>Please don't top post.

>I think your issues at the moment are how to use Nagios, and have 
>nothing to do with Xen. It would be best if you review the Nagios 
>documentation, and/or discuss any issues with the Nagios mailing 
>list/forums/etc.

>When you reach the stage where you are having Xen specific monitoring 
>requirement to add to Nagios, then you may need to come back here to 
>discuss further.

OK, I installed Nagios successfully and now, How can check my Xen health via it?

>
> On Sunday, July 17, 2016 12:15 AM, Simon Hobson <linux@xxxxxxxxxxxxxxxx> 
> wrote:
> JP Pozzi <jpp@xxxxxxxxxxxxxxxxxx> wrote:
>
>> You will have to learn things about Nagios :
>> - Nagios has to know about the hosts you want to monitor
>> - Nagios has to know what services yuo will monitor on every host
>> So you will have to describe all your hosts and services plus the limits
>> (warning or critical) for everything.
> Beat me to it ...
>
> To give the OP a bit of a starter ...
> Typically you will designate one system to do your monitoring - this does not 
> have to be one of your Xen hosts. In my case I run a dedicated machine for 
> this, but you could run it as a Xen guest with the obvious limitation that if 
> the host goes down then so does the monitoring.
>
> The base install of Nagios will probably only be set to monitor the local 
> machine (CPU load, RAM usage, logged in users). You need to define anything 
> you want monitoring - and it's a really good idea to see what templates can 
> do for you. Don't worry too much at the beginning - just experiment a bit, 
> and be prepared to undo stuff and do it a different way as you get the hang 
> of it.
>
> To monitor anything but the local machine, means doing stuff across the 
> network. A simple "is this host there" can be done with ping (as long as ping 
> responses aren't turned off or firewalled). For stuff on the local network, 
> it's also possible to monitor ARP mappings (IIRC I had to write my own plugin 
> for this) - not really useful for most networks, but I do it on our hosting 
> setup so I can detect various things, not least, when someone sets up a 
> device with a duplicate IP address.
>
> You can also monitor services (eg http and smtp) to detect if a remote 
> service is down.
>
> Beyond that, you need to "do stuff" remotely - and there are two main ways to 
> do that.
>
> One is to use SNMP - basically, if the device does SNMP and you know the 
> right OID to use, you can monitor anything covered by the SNMP agent on the 
> device. That could be detecting a link down on a switch, or the operating 
> mode of a UPS, or ...
>
> For "computers", you can also install NRPE - Nagios Remote Plugin Execute. 
> Basically a remote tool which can run Nagios plugins on the target device and 
> return the results. Typically (the safe way) you pre-define everything on the 
> remote device, but it's possible (at the cost of exposing a potential 
> security hole) to pass parameters to the NRPE service - allowing arbitrary 
> plugin execution (the security hole being the possibility of arbitrary remote 
> code execution if you don't secure the communications channel).
>
> So I would start with the basics.
> Get Nagios running and check that the builtin checks are working.
> Add some hosts (your Xen hosts, and some guests), and define some services - 
> ping is a basic one, after that SMTP for mail servers, HTTP for web servers, 
> and so on. It's possible to do a lot of monitoring of your Xen system simply 
> by monitoring the guests as though they were standalone machines - if they 
> are there on the network, then they are running !
> If you wanted more detailed monitoring, then you'd be looking at setting up 
> NRPE or SNMP on the Xen hosts and/or Guests. Eg, if you want to monitor disk 
> space on a guest, use SNMP or NRPE on the guest to do that.
>
> Just don't try and do everything at once. Get some basics working, and go 
> from there.
>
>
>
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