Re: [Nagios-users] Problems checking external host

[Morris, Patrick]

ReynierPM wrote:
> Morris, Patrick wrote:
>   
>> ReynierPM wrote:
>>
>> check_by_ssh does host key checking, and if one does not exist or it 
>> does not match what's in Nagios's known_hosts file, it will fail.
>>
>> The easy fix would be to SSH from the Nagios box to each of those hosts 
>> manually as the Nagios user, using the exact same address Nagios will 
>> use when checking, and let it save the host key.
>>
>> 
>
> I try both solution, make SSH key at Nagios server and copy RSA key to 
> /root/.ssh/authorized_keys and also login as r...@10.128.50.11 to the 
> remote server and the error still. Any other help?
>
>   
The part I'm fairly sure you're missing is that the name in 
authorized_keys must match the name or address Nagios uses, exactly. 
That's really the only reason you'd see that error.


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Re: [Nagios-users] Installing Nagios Server on a Virtual Machine

[Terry.Rankine]

Hi

We have an esx pool of about 120 VMs, and about 4-5 service checks per vm 
(disk/stock web/ssh/ldap/ssl certificate expiry/tomcat web apps/etc etc). The 
nagios monitor (also a vm) hits them all.

Only ‘unique’ issue we have since the vms are in a really aggressive load 
balancer, outages in networks with effect different VMS as they have vmotioned 
somewhere else in the cluster. We haven’t won that battle – and are happy to 
just live with it for now.

As for scaling – its a debian box with 256mb of memory also running our LDAP 
slave server, and looks at 600 different things. And we run nagiosgrapher to 
disk.
I think thats a win for nagios ☺

Terry



From: gmartin [mailto:gmar...@gmartin.org] 
Sent: Friday, 13 November 2009 9:19 AM
To: nagios-users@lists.sourceforge.net
Subject: Re: [Nagios-users] Installing Nagios Server on a Virtual Machine

This definitely a question of scale.  I suspect a virtual solution could 
support a couple thousand services or even more in a distributed environment.  
For a smaller environment it would be a no-brainer.

We virtualize everything by default so the next nagios server will go virtual 
in our MS Hyper-V pool.

\\Greg
On Thu, Nov 12, 2009 at 12:36 PM, Frost, Mark {PBG}  
wrote:
This was a year or two ago, but we found that when we ran Nagios in this way it 
worked in general, but because of the sort of variable size of a second on 
VMware, the latencies were kind of screwed up.  This was clearly evidenced when 
we looked at the performance statistics.  Nagios indicated that a lot of checks 
ran earlier or later than it had expected them to.

I don't know if somehow that's gone away or not, but it was a big issue for us 
and not within the realm of things we were able to tolerate so we want back to 
physical servers.

One of the arguments I know I've seen before on this list is the idea that 
you're doing your critical system monitoring inside an abstracted layer (the 
VM) which might alter your view of the world or fail to work should there be an 
issue with the ESX server.  But all possible acceptable depending on your 
site's needs.

Mark

>-Original Message-
>From: DE/HAM Hoppe, Leif [mailto:leif.ho...@hartrodt.com]
>Sent: Thursday, November 12, 2009 8:00 AM
>To: nagios-users@lists.sourceforge.net
>Subject: Re: [Nagios-users] Installing Nagios Server on a Virtual
>Machine
>
>Hi Juki,
>
>No problems here, either.
>OpenSuSe on Vmware ESX.
>
>regards from Hamburg
>
>cheers
>Leif
>
>-Original Message-
>From: Christian Schneemann [mailto:cschneem...@suse.de]
>Sent: Donnerstag, 12. November 2009 13:03
>To: nagios-users@lists.sourceforge.net
>Subject: Re: [Nagios-users] Installing Nagios Server on a Virtual
>Machine
>
>Hi,
>
>On Thursday November 12 2009 12:42:47 pm Juki wrote:
>> Hello people,
>>
>> I would like to know if it is advisable (or best practice) to install
>and
>> run a Nagios monitoring server on a virtual machine (in this case,
>with
>> OpenSuSE as the OS) with
>> the intention of monitoring physical hardware client machines on the
>same
>> LAN.
>
>we have our Nagios testsystem and some distributed Nagios' running in
>Xen
>guests. We are seeing no problems with doing that.
>
>>
>> If so, what known issues should I look out for in this case?
>>
>>
>> Thanks,
>> Juki
>
>Greetings,
> Christian
>
>--
>Christian Schneemann
>Operations & Services
\\Greg
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Re: [Nagios-users] Installing Nagios Server on a Virtual Machine

[Steve Shipway]

I would be very very wary of running Nagios on a VM (we use VMware here).  The 
reason for this is Clock Skew.

Clock Skew causes the virtual clock on the guest OS to lag behind then skip 
forward depending on the loading and sleep times of the guest.  Note that this 
will not affect 'Para-virtualised' guests as they share the hardware clock, but 
these are only possible in some Xen guests at the moment AFAIK and are not 
common.  VMWare can't do them.

On a lightly loaded physical machine your clock skew will be negligible but as 
load goes up you can get the guest clock lagging as much as 10sec or even more. 
 This can screw up latencies, scheduling, rate calculations (such as CPU use 
and net use) and so on.  In addition any monitoring of virtualised resource 
(CPU, Memory) will be completely wrong unless you obtain the values from a 
source which is aware of the virtualiasation (eg VMWare tools API or 
VirtualCentre API for vmware)

Clock skew and virtualised resource monitoring has caused too many problems in 
our tests and we now only use physical servers for Nagios (and MRTG).

I have a Nagios plugin check_vmware at 
www.steveshipway.org/forum for monitoring 
VMware virtualised resources via the API to get meaningful values - previous 
used check_esx3 but this has been superceeded by the use of the VC API in 
check_vmware

Steve


From: Juki [juki.e...@gmail.com]
Sent: Friday, 13 November 2009 12:42 a.m.
To: Nagios Users Mail-list
Subject: [Nagios-users] Installing Nagios Server on a Virtual Machine

Hello people,

I would like to know if it is advisable (or best practice) to install and run a 
Nagios monitoring server on a virtual machine (in this case, with OpenSuSE as 
the OS) with
the intention of monitoring physical hardware client machines on the same LAN.

If so, what known issues should I look out for in this case?


Thanks,
Juki
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Re: [Nagios-users] Installing Nagios Server on a Virtual Machine

[gmartin]

This definitely a question of scale.  I suspect a virtual solution could
support a couple thousand services or even more in a distributed
environment.  For a smaller environment it would be a no-brainer.

We virtualize everything by default so the next nagios server will go
virtual in our MS Hyper-V pool.

\\Greg

On Thu, Nov 12, 2009 at 12:36 PM, Frost, Mark {PBG}
wrote:

> This was a year or two ago, but we found that when we ran Nagios in this
> way it worked in general, but because of the sort of variable size of a
> second on VMware, the latencies were kind of screwed up.  This was clearly
> evidenced when we looked at the performance statistics.  Nagios indicated
> that a lot of checks ran earlier or later than it had expected them to.
>
> I don't know if somehow that's gone away or not, but it was a big issue for
> us and not within the realm of things we were able to tolerate so we want
> back to physical servers.
>
> One of the arguments I know I've seen before on this list is the idea that
> you're doing your critical system monitoring inside an abstracted layer (the
> VM) which might alter your view of the world or fail to work should there be
> an issue with the ESX server.  But all possible acceptable depending on your
> site's needs.
>
> Mark
>
> >-Original Message-
> >From: DE/HAM Hoppe, Leif [mailto:leif.ho...@hartrodt.com]
> >Sent: Thursday, November 12, 2009 8:00 AM
> >To: nagios-users@lists.sourceforge.net
> >Subject: Re: [Nagios-users] Installing Nagios Server on a Virtual
> >Machine
> >
> >Hi Juki,
> >
> >No problems here, either.
> >OpenSuSe on Vmware ESX.
> >
> >regards from Hamburg
> >
> >cheers
> >Leif
> >
> >-Original Message-
> >From: Christian Schneemann [mailto:cschneem...@suse.de]
> >Sent: Donnerstag, 12. November 2009 13:03
> >To: nagios-users@lists.sourceforge.net
> >Subject: Re: [Nagios-users] Installing Nagios Server on a Virtual
> >Machine
> >
> >Hi,
> >
> >On Thursday November 12 2009 12:42:47 pm Juki wrote:
> >> Hello people,
> >>
> >> I would like to know if it is advisable (or best practice) to install
> >and
> >> run a Nagios monitoring server on a virtual machine (in this case,
> >with
> >> OpenSuSE as the OS) with
> >> the intention of monitoring physical hardware client machines on the
> >same
> >> LAN.
> >
> >we have our Nagios testsystem and some distributed Nagios' running in
> >Xen
> >guests. We are seeing no problems with doing that.
> >
> >>
> >> If so, what known issues should I look out for in this case?
> >>
> >>
> >> Thanks,
> >> Juki
> >
> >Greetings,
> > Christian
> >
> >--
> >Christian Schneemann
> >Operations & Services
>
\\Greg
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[Nagios-users] Cisco's Application Control Engine [ACE] - performance monitoring via Nagios

[Jones, Stuart]

 
Has anyone had an opportunity or need to monitor the performance of
Cisco's ACE using Nagios typically via SNMP Get commands?
 
If so would you mind sharing your experiences, settings and impressions
please?
 
Thx, Stuart
 
 
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Re: [Nagios-users] Problems checking external host

[ReynierPM]

Morris, Patrick wrote:
> ReynierPM wrote:
> 
> check_by_ssh does host key checking, and if one does not exist or it 
> does not match what's in Nagios's known_hosts file, it will fail.
> 
> The easy fix would be to SSH from the Nagios box to each of those hosts 
> manually as the Nagios user, using the exact same address Nagios will 
> use when checking, and let it save the host key.
> 

I try both solution, make SSH key at Nagios server and copy RSA key to 
/root/.ssh/authorized_keys and also login as r...@10.128.50.11 to the 
remote server and the error still. Any other help?

-- 
Saludos
ReynierPM

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Re: [Nagios-users] Installing Nagios Server on a Virtual Machine

[Frost, Mark {PBG}]

This was a year or two ago, but we found that when we ran Nagios in this way it 
worked in general, but because of the sort of variable size of a second on 
VMware, the latencies were kind of screwed up.  This was clearly evidenced when 
we looked at the performance statistics.  Nagios indicated that a lot of checks 
ran earlier or later than it had expected them to.

I don't know if somehow that's gone away or not, but it was a big issue for us 
and not within the realm of things we were able to tolerate so we want back to 
physical servers.

One of the arguments I know I've seen before on this list is the idea that 
you're doing your critical system monitoring inside an abstracted layer (the 
VM) which might alter your view of the world or fail to work should there be an 
issue with the ESX server.  But all possible acceptable depending on your 
site's needs.

Mark

>-Original Message-
>From: DE/HAM Hoppe, Leif [mailto:leif.ho...@hartrodt.com]
>Sent: Thursday, November 12, 2009 8:00 AM
>To: nagios-users@lists.sourceforge.net
>Subject: Re: [Nagios-users] Installing Nagios Server on a Virtual
>Machine
>
>Hi Juki,
>
>No problems here, either.
>OpenSuSe on Vmware ESX.
>
>regards from Hamburg
>
>cheers
>Leif
>
>-Original Message-
>From: Christian Schneemann [mailto:cschneem...@suse.de]
>Sent: Donnerstag, 12. November 2009 13:03
>To: nagios-users@lists.sourceforge.net
>Subject: Re: [Nagios-users] Installing Nagios Server on a Virtual
>Machine
>
>Hi,
>
>On Thursday November 12 2009 12:42:47 pm Juki wrote:
>> Hello people,
>>
>> I would like to know if it is advisable (or best practice) to install
>and
>> run a Nagios monitoring server on a virtual machine (in this case,
>with
>> OpenSuSE as the OS) with
>> the intention of monitoring physical hardware client machines on the
>same
>> LAN.
>
>we have our Nagios testsystem and some distributed Nagios' running in
>Xen
>guests. We are seeing no problems with doing that.
>
>>
>> If so, what known issues should I look out for in this case?
>>
>>
>> Thanks,
>> Juki
>
>Greetings,
> Christian
>
>--
>Christian Schneemann
>Operations & Services
>-
>SUSE LINUX Products GmbH,
>Maxfeldstr. 5, D - 90409 Nürnberg
>
>Phone:  +49 (0)911 - 740 53 0
>e-mail: cschneem...@suse.de
>-
>SUSE LINUX Products GmbH, GF: Markus Rex
>HRB 16746 (AG Nürnberg)
>
>
>--
>Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-
>Day
>trial. Simplify your report design, integration and deployment - and
>focus on
>what you do best, core application coding. Discover what's new with
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>https://lists.sourceforge.net/lists/listinfo/nagios-users
>::: Please include Nagios version, plugin version (-v) and OS when
>reporting any issue.
>::: Messages without supporting info will risk being sent to /dev/null
>
>
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>Day
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Re: [Nagios-users] Monitoring Multiple Servers

[Morris, Patrick]

Kevin Holleran wrote:
> I am grouping a series of servers together (for example, all File and
> Print Servers).  I remember seeing in a post someone mentioning
> wildcards for setting up monitoring.  Can I define all the servers in
> a cfg file, and then set up a single monitor to cover all servers?  So
> instead of having a "monitor disk space on C: drive for server 1",
> "monitor disk space on C: drive for server 2" ... "monitor disk space
> on C: drive for server N", can I say "monitor disk space on C: drive
> for all servers in CFG file"?

Sure. Stick them in a hostgroup, and attach the monitor to that group 
using hostgroup_name



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Re: [Nagios-users] Monitoring Multiple Servers

[Adrian Chapela]

Kevin Holleran escribió:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> Hello,
>
> I am grouping a series of servers together (for example, all File and
> Print Servers).  I remember seeing in a post someone mentioning
> wildcards for setting up monitoring.  Can I define all the servers in
> a cfg file, and then set up a single monitor to cover all servers?  So
> instead of having a "monitor disk space on C: drive for server 1",
> "monitor disk space on C: drive for server 2" ... "monitor disk space
> on C: drive for server N", can I say "monitor disk space on C: drive
> for all servers in CFG file"?
>   

Are you looking for something like that ?

host_name   server1,server2, ... , serverN

> Thanks.  I have been trying to replace our network monitoring software
> with Nagios and I will say that though I have not completed the set up
> for our infrastructure, I have already changed many opinions from "No
> way" to "That looks great, what else can you do"
>
> Thanks for your continued support.
>
> Kevin
> -BEGIN PGP SIGNATURE-
> Version: GnuPG v1.4.9 (MingW32)
> Comment: Use GnuPG with Firefox : http://getfiregpg.org (Version: 0.7.10)
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> -END PGP SIGNATURE-
>
> --
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day 
> trial. Simplify your report design, integration and deployment - and focus on 
> what you do best, core application coding. Discover what's new with
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> ::: Please include Nagios version, plugin version (-v) and OS when reporting 
> any issue. 
> ::: Messages without supporting info will risk being sent to /dev/null
>
>   


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[Nagios-users] Monitoring Multiple Servers

[Kevin Holleran]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Hello,

I am grouping a series of servers together (for example, all File and
Print Servers).  I remember seeing in a post someone mentioning
wildcards for setting up monitoring.  Can I define all the servers in
a cfg file, and then set up a single monitor to cover all servers?  So
instead of having a "monitor disk space on C: drive for server 1",
"monitor disk space on C: drive for server 2" ... "monitor disk space
on C: drive for server N", can I say "monitor disk space on C: drive
for all servers in CFG file"?

Thanks.  I have been trying to replace our network monitoring software
with Nagios and I will say that though I have not completed the set up
for our infrastructure, I have already changed many opinions from "No
way" to "That looks great, what else can you do"

Thanks for your continued support.

Kevin
-BEGIN PGP SIGNATURE-
Version: GnuPG v1.4.9 (MingW32)
Comment: Use GnuPG with Firefox : http://getfiregpg.org (Version: 0.7.10)

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=3uyL
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Re: [Nagios-users] Installing Nagios Server on a Virtual Machine

[DE/HAM Hoppe, Leif]

Hi Juki,

No problems here, either.
OpenSuSe on Vmware ESX.

regards from Hamburg

cheers
Leif

-Original Message-
From: Christian Schneemann [mailto:cschneem...@suse.de]
Sent: Donnerstag, 12. November 2009 13:03
To: nagios-users@lists.sourceforge.net
Subject: Re: [Nagios-users] Installing Nagios Server on a Virtual Machine

Hi,

On Thursday November 12 2009 12:42:47 pm Juki wrote:
> Hello people,
>
> I would like to know if it is advisable (or best practice) to install and
> run a Nagios monitoring server on a virtual machine (in this case, with
> OpenSuSE as the OS) with
> the intention of monitoring physical hardware client machines on the same
> LAN.

we have our Nagios testsystem and some distributed Nagios' running in Xen
guests. We are seeing no problems with doing that.

>
> If so, what known issues should I look out for in this case?
>
>
> Thanks,
> Juki

Greetings,
 Christian

--
Christian Schneemann
Operations & Services
-
SUSE LINUX Products GmbH,
Maxfeldstr. 5, D - 90409 Nürnberg

Phone:  +49 (0)911 - 740 53 0
e-mail: cschneem...@suse.de
-
SUSE LINUX Products GmbH, GF: Markus Rex
HRB 16746 (AG Nürnberg)

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Re: [Nagios-users] Installing Nagios Server on a Virtual Machine

[Christian Schneemann]

Hi,

On Thursday November 12 2009 12:42:47 pm Juki wrote:
> Hello people,
>
> I would like to know if it is advisable (or best practice) to install and
> run a Nagios monitoring server on a virtual machine (in this case, with
> OpenSuSE as the OS) with
> the intention of monitoring physical hardware client machines on the same
> LAN.

we have our Nagios testsystem and some distributed Nagios' running in Xen 
guests. We are seeing no problems with doing that.

>
> If so, what known issues should I look out for in this case?
>
>
> Thanks,
> Juki

Greetings,
 Christian

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[Nagios-users] Installing Nagios Server on a Virtual Machine

[Juki]

Hello people,

I would like to know if it is advisable (or best practice) to install and
run a Nagios monitoring server on a virtual machine (in this case, with
OpenSuSE as the OS) with
the intention of monitoring physical hardware client machines on the same
LAN.

If so, what known issues should I look out for in this case?


Thanks,
Juki
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