Uptime error
Andy Shellam (Mailing Lists)
andy.shellam-lists at mailnetwork.co.uk
Wed Feb 28 11:01:45 CET 2007
Again, as I and Patrick have said, your host's check_command is only
getting run when a service is deemed to have problems.
You're getting the difference in the uptime output in Nagios and the
console because Nagios hasn't run the uptime command for the host for
over a day.
If you're not retaining status information, then when you restart
Nagios, it re-runs all it's checks, hence why it then gets updated.
After that it is only run when a service fails.
What I still don't understand is how your uptime command ensures the
router is up? If the router is not up, then Nagios won't be running (as
you're running it on the same host) so it seems quite pointless really.
If the Lanlink checks that the LAN interface is up and connected - that
makes sense, but then a check_ping to 127.0.0.1 as your host
check_command would give the same result as the uptime, then you could
have an "Uptime" service with your check_uptime command.
That way you could be confident that the status detail in Nagios is
reasonably up-to-date.
Andy.
sujith h wrote:
> Ok let me explain the scenario in detail.
> I have my router in which nagios is installed.
> I have to monitor a few services like Lanstatus of
> net1 interface, Webserver, and DNS.
> Well now for this I have a host.cfg and services.cfg file
> where I had configured this way:
> Host.cfg
> define hostgroup{
> hostgroup_name Enpaq
> alias Enpaq
> members sujith
> }
>
> define host{
> host_name sujith
> alias Enpaq Router
> address 127.0.0.1 <http://127.0.0.1>
> max_check_attempts 1
> check_command check_uptime
> check_period 24x7
> contact_groups admin
> notification_interval 0
> notification_period 24x7
> notification_options d,u,r,f
> }
>
> And services.cfg
> define service{
> host_name sujith
> service_description LAN LINK
> check_command check_link!net1
> max_check_attempts 1
> normal_check_interval 1
> retry_check_interval 1
> check_period 24x7
> notification_interval 2
> notification_period 24x7
> notification_options w,u,c,r,f
> contact_groups admin
> }
>
> define service{
> host_name sujith
> service_description WEB SERVER
> check_command check_procs!1:!1:!apache2!SNSlSsRl
> max_check_attempts 1
> normal_check_interval 1
> retry_check_interval 1
> check_period 24x7
> notification_interval 2
> notification_period 24x7
> notification_options w,u,c,r,f
> contact_groups admin
> }
>
>
> define service{
> host_name sujith
> service_description DNS
> check_command check_dig!sujith.elina.in
> max_check_attempts 1
> normal_check_interval 1
> retry_check_interval 1
> check_period 24x7
> notification_interval 2
> notification_period 24x7
> notification_options w,u,c,r,f
> contact_groups admin
> }
>
> This is all about the 2 files. And let me give the output also.
> When I type the command uptime in my router I see like this:
> sujith at sujith:~$uptime
> 15:15:50 up 4 days, 4:54, 1 user, load average: 0.76, 0.70, 0.59
>
> And when I see the nagios page for the Host Detail section, the Status
> Information shows me:
>
> 20:17:46 up 3 days, 9:56, 1 user, load average: 0.89, 0.86, 0.71
>
> But the output that I had given you is from the running nagios page.
> If i would restart nagios then everything will be ok for a while.
> This is what I want to know why this output comes like this.
> Again in the /var/nagios/status.dat file is there which when I do
> ls -lt command , it shows me that its getting updated in each and
> every minute. Now if u again have any doubt on what I am trying to
> tell please do mail me. Again I do repeat that when I do
> /usr/local/nagios/bin/nagios -v /etc/nagios/etc/nagios.cfg
> It doesn't give me any error. But this misbehaviour is worrying
> me....
>
>
> Sujith
>
> Bangalore
>
> On 2/28/07, *Andy Shellam (Mailing Lists)*
> <andy.shellam-lists at mailnetwork.co.uk
> <mailto:andy.shellam-lists at mailnetwork.co.uk>> wrote:
>
> I think you need to explain what you're trying to do overall, as
> this isn't making any sense to me!
>
> You cannot possibly determine which server is responding using
> it's uptime output.
> A more sensible option surely would be it's hostname?
>
> #!/bin/bash
> hostname
> exit 0
>
> However you're going to run into a lot of trouble trying to use
> Nagios to monitor a server using its dynamic IP address.
> I think to start with you need to be looking at a solution such as
> Dynamic DNS (e.g. No-IP, DynDNS for commercial services, or Bind
> with DNSSEC/TSIG if you use Bind within your organisation.)
> Your machines would then change their DNS address when they detect
> their IP address has changed, and you would definite it's dynamic
> DNS hostname as the host_name directive to Nagios.
> Only thing you'd have to watch would be if your DNS service fails,
> Nagios will fail on everything.
>
> Re your last e-mail, please give example outputs of what you see
> on the command-line and what Nagios says.
>
> Andy.
>
> sujith h wrote:
>> Actually the problem with the ping is that we are giving dynamic
>> IP address
>> so when the ip address changes its difficult to know who is
>> responding to the
>> ping. And so we moved to ssh and uptime...
>>
>> Sujith
>>
>> Bangalore.
>>
>> On 2/28/07, *sujith h* < sujith.linux at gmail.com
>> <mailto:sujith.linux at gmail.com>> wrote:
>>
>> Hi Andy,
>>
>> Actually my problem is that it works for some 1 day or more.
>> But after that I get these sort of
>> results. So thats what makes me worry...
>>
>> Sujith
>> Bangalore
>>
>>
>> On 2/28/07, *Andy Shellam (Mailing Lists)* <
>> andy.shellam-lists at mailnetwork.co.uk
>> <mailto:andy.shellam-lists at mailnetwork.co.uk>> wrote:
>>
>> As Patrick said, this plugin (as a host check) will only
>> get run if a service goes into a non-OK state, therefore
>> showing old information until it a service fails.
>>
>> I have exactly the same plugin (written myself with a
>> couple of differences to yours) which runs as a service
>> called "Uptime" on every host - this way it is always run
>> every 5 minutes and shows up-to-date info.
>>
>> The host check is a simple check_ping.
>>
>> HTH
>>
>> Andy.
>>
>> sujith h wrote:
>>>
>>> No am running this plugin for host check only
>>>
>>> Sujith
>>> On 2/28/07, *Morris, Patrick* < patrick.morris at hp.com
>>> <mailto:patrick.morris at hp.com>> wrote:
>>>
>>> > when I click the Host Detail I can see that
>>> > in the status information section we have a
>>> different output.. such
>>> aser
>>> > 20:17:46 up 3 days, 9:56, 1 user, load average:
>>> 0.89, 0.86, 0.71
>>>
>>> > Here u can see that am not getting the output
>>> synchronized.
>>>
>>> > But the problem I had found with
>>> uptime only in
>>> > the Host Detail. The Service Details
>>> > are running good as if now.
>>>
>>> Are you running this command as both a host check
>>> and a service check?
>>> If so, that's why you're seeing different output.
>>> The host check will
>>> only run if a service on it goes to a non-OK state,
>>> and probably hasn't
>>> run for a few days, when the host had only been up
>>> for two minutes.
>>>
>>> It looks like you've defined the same plugin for two
>>> checks. If that's
>>> the case, they are never going to match.
>>>
>>>
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>>
>>
>> --
>> Andy Shellam
>> NetServe Support Team
>>
>> the Mail Network
>> "an alternative in a standardised world"
>>
>> p: +44 (0) 121 288 0832/0839
>> m: +44 (0) 7818 000834
>>
>>
>>
>> !DSPAM:37,45e545e1103007241816293!
>
>
> --
> Andy Shellam
> NetServe Support Team
>
> the Mail Network
> "an alternative in a standardised world"
>
> p: +44 (0) 121 288 0832/0839
> m: +44 (0) 7818 000834
>
>
> !DSPAM:37,45e55161103009057313425!
--
Andy Shellam
NetServe Support Team
the Mail Network
"an alternative in a standardised world"
p: +44 (0) 121 288 0832/0839
m: +44 (0) 7818 000834
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