stucky wrote: > I use the check_by_ssh plugin for most of my stuff and I noticed that > if the primary nameserver is unavailable nagios starts freaking out. > All of a sudden all plugins time out. I tested it using the 'host' > command and it only takes about 1 second longer to lookup hosts using > the secondary nameserver. > The default timeout for check_by_ssh is 10 seconds. I cranked it up to > 30 and still I get timeouts. I'm not sure I understand that one. > Has anyone else seen this. We had a similar issue in that our primary DNS was doing strange things, and it quite often took 5 or even 10 seconds to perform a DNS lookup. What we were seeing was 70% of service checks (and subsequently host checks) failing by timing out. The key was the multiple of 5 seconds. The resolver timeout on, say, RHEL3 is based on RES_TIMEOUT in resolv.h... which was 5 seconds.
We added the following to our resolv.conf, and found the problems went away: options timeout:2 rotate This sets the timeout for waiting for a reply to 2 seconds, and tells the resolve to rotate through your 'nameserver' entries rather than always hitting #1, then #2, etc. Cheers. ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ 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