check_ping is a pig :) It's okay for services since they can run in parallel but host checks are serialized which can b0rk your whole system if many hosts go down at the same time.
A faster way to do this is to use check_icmp, which does 5 pings at the same time (concurrently) as opposed to 5 in a row (consecutive) like check_ping does. An even faster check is using check_host as a symlink to check_icmp, which still sends the 5 concurrent pings but only requires one to be okay, which is great for hostchecks IMHO. There is a slight security hit using check_icmp or check_host as you must SetUID it. Read the docs, this is all from memory but should be correct, hope this helps! Here is an example: ######################################################################## ### bash-3.1# time ./check_ping -H 192.168.22.1 -w 100.0,20% -c 500.0,60%, 100 PING OK - Packet loss = 0%, RTA = 0.31 ms real 0m4.009s user 0m0.000s sys 0m0.000s ######################################################################## ### bash-3.1# time ./check_icmp -H 192.168.22.1 -w 100.0,20% -c 500.0,60%, 100 OK - 192.168.22.1: rta 0.225ms, lost 0%|rta=0.225ms; 100.000;500.000;0; pl=0%;20;100;; real 0m0.004s user 0m0.000s sys 0m0.004s ######################################################################## ### bash-3.1# time ./check_host -H 192.168.22.1 -w 100.0,20% -c 500.0,60%, 100 OK - 192.168.22.1 responds to ICMP. Packet 1, rta 0.666ms|pkt=1;;0;5 rta=0.666;100.000;500.000;; real 0m0.003s user 0m0.000s sys 0m0.004s ######################################################################## ### On Jun 7, 2007, at 8:07 AM, Jonathan Call wrote: > Is there any reason why Nagios stops running all service checks > while it > executes check-host-alive/ping on hosts? Can I change that? I cannot > find a setting to do it. > > With the large number of service checks I'm running (1300+) whenever a > host goes down (or in some cases just stops answering ICMP) it kills > performance on the Nagios server. > > > Jonathan Call > > > ---------------------------------------------------------------------- > --- > This SF.net email is sponsored by DB2 Express > Download DB2 Express C - the FREE version of DB2 express and take > control of your XML. No limits. Just data. Click to get it now. > http://sourceforge.net/powerbar/db2/ > _______________________________________________ > 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 > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ 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
