check_multi advice to check "Internet available"
Marc Haber
mh+nagios-users at zugschlus.de
Mon May 24 11:37:57 CEST 2010
Hi,
I am checking a number of servers which are "on the Internet", and are
thus likely to become unreachable for my Nagios installations in case
of an outage out there on the Internet. I would like to have a "host"
which I could use as parent host for all those servers so that I don't
get buried under an avalanche of HOST DOWN alarms should my Internet
go partly or fully down.
I have investigated using check_multi do help me with that, and have
come up with a solution which can help me with this task. I would like
to solicit your comments to that solution.
I have defined a number of hosts which are checked by Nagios proper,
just as normal hosts are. Their individual notifications may be
switched off, but I haven't done so since I like to see what's going
on at least in the start phase. Their hostnames all start with
mh-internet, so I can use a single check_multi config line to pull
them all into a single check_multi check. check_multi is then used as
service and host check on a "virtual host" called internet, which goes
CRITICAL when more than one mh-internet-foo host is CRITICAL.
Here is my detailed configuration:
/etc/nagios3/conf.d/internet.cmd:
statusdat [ internet ] = /^mh-internet-.*$/:my-defaultping
state[WARNING] = COUNT(WARNING) > 1
state[CRITICAL] = COUNT(CRITICAL) > 1
state[UNKNOWN] = COUNT(UNKNOWN) > 1
Nagios configuration:
define host {
use mh-host
host_name mh-internet
alias internet
address 127.0.0.1
parents localhost
check_command check_multi!-f /etc/nagios3/conf.d/internet.cmd
}
define service {
name my-internet
use my-service
service_description my-internet
check_command check_multi!-f /etc/nagios3/conf.d/internet.cmd
host_name mh-internet
}
define command {
command_name check_multi
command_line /usr/lib/nagios/plugins/check_multi $ARG1$ $ARG2$ $ARG3$ $ARG4$
}
define host {
use mh-host
host_name mh-internet-torres
hostgroups mh, ping
alias torres.zugschlus.de
address 85.214.68.41
parents mh-internet
}
define host {
use mh-host
host_name mh-internet-heise
hostgroups mh, ping
alias www.heise.de
address www.heise.de
parents mh-internet
}
define host {
use mh-host
host_name mh-internet-google-de
hostgroups mh, ping
alias www.google.de
address www.google.de
parents mh-internet
}
I am wondering whether this is a valid approach, or whether there
are better solutions for this challenge. If somebody familiar with
check_multi configuration, I would like to know whether there are any
possible issues hiding in my use of check_multi. Any comments will be
appreciated.
Greetings
Marc
--
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Marc Haber | "I don't trust Computers. They | Mailadresse im Header
Mannheim, Germany | lose things." Winona Ryder | Fon: *49 621 72739834
Nordisch by Nature | How to make an American Quilt | Fax: *49 3221 2323190
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