On Wed, 18 Aug 2004, Visser, Martin wrote:
> I know it might seem to be a sledgehammer to crack a nut, but Nagios is > a good service oriented monitoring tool that is OSS. I've taken a quick look at this, but *for my purposes* I can't see it's an improvement on just pinging. Problem: I've changed providors, and suddenly I'm getting outages that THEY can't explain. We all suspect routing issues upstream, but no one seems to be able to put a finger on it. My current solution: Run a script once per minute which pings Powertel's border gateway (border-gw015-ge02.powertel.net.au) and emails me if two consecutive pings fail. Result: Averaging one failure/hour.. sometimes several consecutively. Question: Is it reasonable to expect <ping -c 1> to be a true indication of the network status? I understand that ping waits one second before giving an error. That sounds like a network problem to me. The "normal" ping is about 7 ms. I ran this same script for 3 years with my previous providor (optus) and it only complained on the rare occasions that there was a genuine, serious problem. BTW: Nagios looks terrific, but I have complete control of the various services so they are less of a problem for me. It's the network status that's giving me grief. As far as I can tell, to prove the network is up Nagios basically does something similar to what I'm already doing. David. > > BTW Most load-balancing devices that need to do service monitoring > simply open the service port and try to get a basic response that proves > that the service is up and operating. For instance for a web service > with a DB backend you might first do a simple HTTP GET of a static page > (and compare with a known result) and then do a simple DB query via the > web service to make sure the DB is running. Clearly some sort of > algorithm needs to be determined of when to declare a service "down" > (and when to declare it available again). > > (Of course if you want a slightly bigger sledgehammer there is HP > OpenView.... (though not OSS) ) > > Martin Visser ,CISSP > Network and Security Consultant > Consulting & Integration > Technology Solutions Group - HP Services > > 3 Richardson Place > North Ryde, Sydney NSW 2113, Australia > > Phone: +61-2-9022-1670 > Mobile: +61-411-254-513 > Fax: +61-2-9022-1800 > E-mail: martin.visserAThp.com > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of Terry Collins > > Sent: Tuesday, 17 August 2004 10:06 PM > > To: Slug List > > Subject: [SLUG] Network Testing > > > > Curiosity question. > > > > everyone seems to be only using pings to test network connectivity. > > what do people do when they need to test a service? > > telnet IP PORT? > > > > Thinking of cheops functionality. > > -- > > Terry Collins {:-)}}} email: terryc at woa.com.au www: > > http://www.woa.com.au > > Wombat Outdoor Adventures <Bicycles, Computers, GIS, Printing, > > Publishing> > > > > "People without trees are like fish without clean water" > > -- > > SLUG - Sydney Linux User's Group Mailing List - > > http://slug.org.au/ Subscription info and FAQs: > > http://slug.org.au/faq/mailinglists.html > > > > > -- > SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ > Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html > -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
