Re: [Nagios-users] High Availabilty with Nagios

[Jim Winkle]

On 05/09/13, Steve Shipway  wrote:

> Does anyone have an HA setup for Nagios that works?
> 
> I'm thinking of creating a NEB module that will link two Nagios setups, and 
> replicate over all status changes, config changes, downtime, comments, etc 
> etc and then set the 'standby' Nagios to be checks/notifications disabled 
> when in standby mode, and enabled when in active mode. Then put the two 
> behind a failover load balancer (F5, Foundry or apache reverse proxy).

We use rsync (run out of cron every minute) and a floating VIP between two 
hosts. Nagios is running on only one host at a time. It's a trivial (manual) 
process to switch between hosts.

Files which are synced: all Nagios files except logs and transient results. 
Files synced include Nagios configs, binaries and CGIs, helper apps, plugins, 
local plugins and NRPE configs, docs, HTML files, status files, all files in 
~nagios, and the crontab for user nagios. 

-- Jim

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Re: [Nagios-users] High Availabilty with Nagios

[frank]

While HA can be a great thing I've always been of the opinion that a 
monitoring setup needs to have as few moving parts as possible. The more 
complexity to the monitor, the more chance you'll be chasing monitoring 
issues rather than site issues. And everthing you add on top of the 
monitor also needs to be monitored. So somehow that F5 is going to need an 
out-of-band monitor because if it dies then your Nagios host may well not 
have a way to contact you about it unless you've dual homed it which 
brings up a whole other set of issues.


The closest I got to HA at my last gig was creating a CNAME for the active 
Nagios host so in a failover you point the CNAME to the new box and at 
least passive checks can still roll in (after DNS timeout of course, which 
I say is better than reconfiging every NSCA clent).


-f

On Thu, 9 May 2013, Steve Shipway wrote:


Date: Thu, 9 May 2013 09:19:17 +
From: Steve Shipway 
Reply-To: Nagios Users List 
To: "nagios-users@lists.sourceforge.net" 
Subject: [Nagios-users] High Availabilty with Nagios

Does anyone have an HA setup for Nagios that works?

I'm thinking of creating a NEB module that will link two Nagios setups, and 
replicate over all
status changes, config changes, downtime, comments, etc etc and then set the 
'standby' Nagios to
be checks/notifications disabled when in standby mode, and enabled when in 
active mode.  Then
put the two behind a failover load balancer (F5, Foundry or apache reverse 
proxy).

However this would be too much work if someone else has already found an 
equivalent solution.

I've looked at Merlin but it doesn't seem to do what I'm after (and the 
documentation is
practically nonexistant - much the same as the NEB API documentation, in fact). 
 Mod_gearman
lets me have redundant checks and replicate *active* checks, but not commands, 
downtime or
passive checks.

Does anyone out there have a workable way to get an active/standby or 
active/active Nagios
setup?  Would be interested in hearing all ideas...

Steve


Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
s.ship...@auckland.ac.nz
Ph: +64 9 373 7599 ext 86487
 

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Re: [Nagios-users] High Availabilty with Nagios

[Andrew Widdersheim]

I did a talk at last years conference that touches on HA Nagios setup which 
uses DRBD and pacemaker. There were also talks about mod_gearman and Merlin 
that might also be helpful. The slides (and maybe video?) are available on 
nagios.org. Here is a link to my slides:

http://www.slideshare.net/nagiosinc/andrew-widdersheim-nagiosisdownbosswantstosee-you
 
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Re: [Nagios-users] check_http with spaces problem

[Claudio Kuenzler]

>
> If I use -R "Web" the response is ok but if i use -R "Web somethin" it
> returns error!
>

Because the pattern needs to exist in the source code.

./check_http -H granma.gr -u /index.html -R "Web somethin"
HTTP CRITICAL: HTTP/1.1 200 OK - pattern not found - 4342 bytes in 0.126
second response time |time=0.125853s;;;0.00 size=4342B;;;0

./check_http -H granma.gr -u /index.html -R "Web Design"
HTTP OK: HTTP/1.1 200 OK - 4342 bytes in 0.125 second response time
|time=0.124846s;;;0.00 size=4342B;;;0




>
>
> 2013/5/9 Claudio Kuenzler 
>
>>
>> Sun May 5 22:29:03 EEST 2013 /usr/lib64/nagios/plugins/check_http -H
>>> granma.gr -u http://granma.gr/index.html -R "Web " -w 10 -c 20
>>> Name or service not known HTTP CRITICAL - Unable to open TCP socket
>>>
>>
>> You have to break up the -u argument. -u expects the path, not the
>> complete URI. So in this case:
>>
>> /usr/lib64/nagios/plugins/check_http -H granma.gr -u /index.html -R
>> "Web" -w 10 -c 20
>>
>>
>>
>> --
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>> "Graph Databases" is the definitive new guide to graph databases and
>> their applications. This 200-page book is written by three acclaimed
>> leaders in the field. The early access version is available now.
>> Download your free book today! http://p.sf.net/sfu/neotech_d2d_may
>>
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>>
>
>
>
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> leaders in the field. The early access version is available now.
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Re: [Nagios-users] check_http with spaces problem

[Κοκμάδης Δημήτριος]

Thank you for the answer,

The problem doesn't seem to be at the url but at the -R option

If I use -R "Web" the response is ok but if i use -R "Web somethin" it
returns error!


2013/5/9 Claudio Kuenzler 

>
> Sun May 5 22:29:03 EEST 2013 /usr/lib64/nagios/plugins/check_http -H
>> granma.gr -u http://granma.gr/index.html -R "Web " -w 10 -c 20
>> Name or service not known HTTP CRITICAL - Unable to open TCP socket
>>
>
> You have to break up the -u argument. -u expects the path, not the
> complete URI. So in this case:
>
> /usr/lib64/nagios/plugins/check_http -H granma.gr -u /index.html -R "Web"
> -w 10 -c 20
>
>
>
> --
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> "Graph Databases" is the definitive new guide to graph databases and
> their applications. This 200-page book is written by three acclaimed
> leaders in the field. The early access version is available now.
> Download your free book today! http://p.sf.net/sfu/neotech_d2d_may
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>
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Re: [Nagios-users] check_http with spaces problem

[Claudio Kuenzler]

> Sun May 5 22:29:03 EEST 2013 /usr/lib64/nagios/plugins/check_http -H
> granma.gr -u http://granma.gr/index.html -R "Web " -w 10 -c 20
> Name or service not known HTTP CRITICAL - Unable to open TCP socket
>

You have to break up the -u argument. -u expects the path, not the complete
URI. So in this case:

/usr/lib64/nagios/plugins/check_http -H granma.gr -u /index.html -R "Web"
-w 10 -c 20
--
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their applications. This 200-page book is written by three acclaimed 
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Re: [Nagios-users] High Availabilty with Nagios

[Edward St Pierre]

Hi,

I have done this before using drbd for block based replication and
clustering on Redhat, this also could be done with pacemaker/corrosync
clusters also.

Ed


On 9 May 2013 10:51, William Leibzon  wrote:

> On Thu, May 9, 2013 at 2:19 AM, Steve Shipway 
> wrote:
> > Does anyone have an HA setup for Nagios that works?
> >
> > I'm thinking of creating a NEB module that will link two Nagios setups,
> and
> > replicate over all status changes, config changes, downtime, comments,
> etc
> > etc and then set the 'standby' Nagios to be checks/notifications disabled
> > when in standby mode, and enabled when in active mode.  Then put the two
> > behind a failover load balancer (F5, Foundry or apache reverse proxy).
>
> I've thought several times of doing it but never actually get started
> although I have it all planned out kinda like you.
>
> In the mean time my HA setup which I've done for several customers
> involves config synced using git or svn (script run by cron that
> checks if its something new and then restart nagios if config passes
> tests). Both servers doing checks but config is such that for one
> server all notifications are disabled except for cross-checking of the
> other nagios This is achieved by having common template from which all
> services are derived and this template is in a file specific to each
> server and so one has notifications disabled and the other enabled.
> This is not a full HA in a way that if one server dies you have to
> execute a script that would enable the other servers for notifications
> (this can be done automatically too but I prefer people to do it).
>
> > However this would be too much work if someone else has already found an
> > equivalent solution.
> >
> > I've looked at Merlin but it doesn't seem to do what I'm after (and the
> > documentation is practically nonexistant - much the same as the NEB API
> > documentation, in fact).  Mod_gearman lets me have redundant checks and
> > replicate *active* checks, but not commands, downtime or passive checks.
> >
> > Does anyone out there have a workable way to get an active/standby or
> > active/active Nagios setup?  Would be interested in hearing all ideas...
> >
> > Steve
> >
> >
> > Steve Shipway
> > University of Auckland ITS
> > UNIX Systems Design Lead
> > s.ship...@auckland.ac.nz
> > Ph: +64 9 373 7599 ext 86487
> >
> >
> >
> --
> > Learn Graph Databases - Download FREE O'Reilly Book
> > "Graph Databases" is the definitive new guide to graph databases and
> > their applications. This 200-page book is written by three acclaimed
> > leaders in the field. The early access version is available now.
> > Download your free book today! http://p.sf.net/sfu/neotech_d2d_may
> > ___
> > Nagios-users mailing list
> > Nagios-users@lists.sourceforge.net
> > 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
>
>
> --
> Learn Graph Databases - Download FREE O'Reilly Book
> "Graph Databases" is the definitive new guide to graph databases and
> their applications. This 200-page book is written by three acclaimed
> leaders in the field. The early access version is available now.
> Download your free book today! http://p.sf.net/sfu/neotech_d2d_may
> ___
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>
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Re: [Nagios-users] High Availabilty with Nagios

[William Leibzon]

On Thu, May 9, 2013 at 2:19 AM, Steve Shipway  wrote:
> Does anyone have an HA setup for Nagios that works?
>
> I'm thinking of creating a NEB module that will link two Nagios setups, and
> replicate over all status changes, config changes, downtime, comments, etc
> etc and then set the 'standby' Nagios to be checks/notifications disabled
> when in standby mode, and enabled when in active mode.  Then put the two
> behind a failover load balancer (F5, Foundry or apache reverse proxy).

I've thought several times of doing it but never actually get started
although I have it all planned out kinda like you.

In the mean time my HA setup which I've done for several customers
involves config synced using git or svn (script run by cron that
checks if its something new and then restart nagios if config passes
tests). Both servers doing checks but config is such that for one
server all notifications are disabled except for cross-checking of the
other nagios This is achieved by having common template from which all
services are derived and this template is in a file specific to each
server and so one has notifications disabled and the other enabled.
This is not a full HA in a way that if one server dies you have to
execute a script that would enable the other servers for notifications
(this can be done automatically too but I prefer people to do it).

> However this would be too much work if someone else has already found an
> equivalent solution.
>
> I've looked at Merlin but it doesn't seem to do what I'm after (and the
> documentation is practically nonexistant - much the same as the NEB API
> documentation, in fact).  Mod_gearman lets me have redundant checks and
> replicate *active* checks, but not commands, downtime or passive checks.
>
> Does anyone out there have a workable way to get an active/standby or
> active/active Nagios setup?  Would be interested in hearing all ideas...
>
> Steve
>
>
> Steve Shipway
> University of Auckland ITS
> UNIX Systems Design Lead
> s.ship...@auckland.ac.nz
> Ph: +64 9 373 7599 ext 86487
>
>
> --
> Learn Graph Databases - Download FREE O'Reilly Book
> "Graph Databases" is the definitive new guide to graph databases and
> their applications. This 200-page book is written by three acclaimed
> leaders in the field. The early access version is available now.
> Download your free book today! http://p.sf.net/sfu/neotech_d2d_may
> ___
> Nagios-users mailing list
> Nagios-users@lists.sourceforge.net
> 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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Re: [Nagios-users] High Availabilty with Nagios

[Supporto Tecnico - Crazy Network]

I would be interested too, i'm actually using merlind for this right 
now, but i would like to dont have for example double notifications if a 
server goes down.. and i do want both nagios set for notify, since if 
one is down (for any reason) the other one should be able to check and 
notify and vice-versa

Regards


Il 09/05/2013 11:19, Steve Shipway ha scritto:
> Does anyone have an HA setup for Nagios that works?
>
> I'm thinking of creating a NEB module that will link two Nagios 
> setups, and replicate over all status changes, config changes, 
> downtime, comments, etc etc and then set the 'standby' Nagios to be 
> checks/notifications disabled when in standby mode, and enabled when 
> in active mode.  Then put the two behind a failover load balancer (F5, 
> Foundry or apache reverse proxy).
>
> However this would be too much work if someone else has already found 
> an equivalent solution.
>
> I've looked at Merlin but it doesn't seem to do what I'm after (and 
> the documentation is practically nonexistant - much the same as the 
> NEB API documentation, in fact).  Mod_gearman lets me have redundant 
> checks and replicate *active* checks, but not commands, downtime or 
> passive checks.
>
> Does anyone out there have a workable way to get an active/standby or 
> active/active Nagios setup?  Would be interested in hearing all ideas...
>
> Steve
>
>
> *Steve Shipway*
> University of Auckland ITS
> /UNIX Systems Design Lead/
> s.ship...@auckland.ac.nz 
> Ph: +64 9 373 7599 ext 86487
> //
>
>
> --
> Learn Graph Databases - Download FREE O'Reilly Book
> "Graph Databases" is the definitive new guide to graph databases and
> their applications. This 200-page book is written by three acclaimed
> leaders in the field. The early access version is available now.
> Download your free book today! http://p.sf.net/sfu/neotech_d2d_may
>
>
> ___
> Nagios-users mailing list
> Nagios-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nagios-users
> ::: Please include Nagios version, plugin version (-v) and OS when reporting 
> any issue.
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[Nagios-users] High Availabilty with Nagios

[Steve Shipway]

Does anyone have an HA setup for Nagios that works?

I'm thinking of creating a NEB module that will link two Nagios setups, and 
replicate over all status changes, config changes, downtime, comments, etc etc 
and then set the 'standby' Nagios to be checks/notifications disabled when in 
standby mode, and enabled when in active mode.  Then put the two behind a 
failover load balancer (F5, Foundry or apache reverse proxy).

However this would be too much work if someone else has already found an 
equivalent solution.

I've looked at Merlin but it doesn't seem to do what I'm after (and the 
documentation is practically nonexistant - much the same as the NEB API 
documentation, in fact).  Mod_gearman lets me have redundant checks and 
replicate *active* checks, but not commands, downtime or passive checks.

Does anyone out there have a workable way to get an active/standby or 
active/active Nagios setup?  Would be interested in hearing all ideas...

Steve


Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
s.ship...@auckland.ac.nz
Ph: +64 9 373 7599 ext 86487

--
Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and 
their applications. This 200-page book is written by three acclaimed 
leaders in the field. The early access version is available now. 
Download your free book today! http://p.sf.net/sfu/neotech_d2d_may___
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