Search Again: Re: Load Balancing question From: Men & Mice Support Date: Wednesday, July 3, 2002 Time: 12:22:16 pm OK, let's go over the various problems present. 1. Not all of these domains use load balancing. For example, officefurniturerep.com does not. 2. Only one of your DNS servers has the load balance record, ns1.infoedg.com. The others, including ns2.infoedg.com, do not, meaning that if ns1 goes down, all load balancing stops. 3. The TTL of your load balance record is 86400. This is far too high for a load balance record. Change it to something short, such as 300 seconds. The combination of items 2 and 3 means that your slave servers, of which you have three, will cache one of the IP addresses of your websites, and they'll do so for up to 24 hours. Thus even when the master server is working, there isn't much load balancing or fault tolerance going on. If the main web server goes down, the master DNS server will start giving out the IP address of the other web server. If this goes on for a sufficiently long time, the slave DNS servers will eventually cache this IP address, and will then continue to give it out for the following 24 hours, regardless of whether the main web server comes back up again. ____________________________________________________________________ Chris Buxton Men & Mice support@menandmice.com Making DNS Easy At 2:55 PM +0800 7/3/02, Suzanne Swift wrote: >Here are the names we were testing: > >yoma.com >boydlighting.com >riviera-usa.com >furniture-office.com >infoedg.com >officefurniturerep.com >adi-artdesign.com > >>This sounds like a misconfiguration of the slave DNS server, along >>with possibly a caching issue. Can you give us one or more of the >>website names in question? >>____________________________________________________________________ >>Chris Buxton Men & Mice >>support@menandmice.com Making DNS Easy >> >>At 9:19 AM +0800 7/3/02, Suzanne Swift wrote: >>>I have two Web servers A and B. Quick DNS is set up to load balance so that >>>99% of the load goes to A and 1 % to B. >>> >>>I ran a DNS system test and took my primary DNS server off-line. >>>Both Web server A & B were still on-line. When I did a DNS >>>look-up for four of my host names - all were being pointed at >>>server B (the 1% server). >>> >>>I then turned the primary DNS server back on and checked 7 hosts. 5 were >>>now pointing at server B and two at server A. >>> >>>I checked again the next morning and six domains were pointing at >>>server B and >>>only one at server A. >>> >>>Finally, approximately 24 hours or so after turning the primary load server >>>on and off, I checked the seven host names again: all seven were now >>>pointing at server A. >>> >>>My primary host name settings (I run virtual hosting) are: >>> >>>Refresh: 28800 >>>Retry: 7200 >>>Expire: 604800 >>>Minimum: 86400 >>>Time-to-live: 86400 >>> >>>The Load balance record settings are: >>> >>>Interval: 30 >>>Hostlife: 60 >>> >>> >>>My question is: Why does the DNS shift the load to Server B when >>>the Primary DNS machine goes down? Is there any way to prevent >>>this from happening? >>>-- >>>Thanks, >>>Suzanne

Messages In This Thread: Load Balancing Question by Kirk Samuelson on Oct 14, 1999 at 11:07:00 am Re: Load Balancing Question by Paul Willis on Oct 14, 1999 at 11:41:00 am Re: Load Balancing Question by Kirk Samuelson on Oct 14, 1999 at 8:50:00 pm Re: Load Balancing Question by Paul Willis on Oct 15, 1999 at 10:38:00 am Re: Load Balancing Question by Peter Lalor on Oct 16, 1999 at 6:55:00 pm Re: Load Balancing Question by Kirk Samuelson on Oct 18, 1999 at 8:49:00 pm Re: Load Balancing Question by Rob Thiemann on Oct 18, 1999 at 9:46:00 pm Re: Load Balancing Question by Kirk Samuelson on Oct 19, 1999 at 1:26:00 am Re: Load Balancing Question by Rob Thiemann on Oct 19, 1999 at 1:49:00 am Re: Load Balancing Question by Paul Willis on Oct 19, 1999 at 12:23:00 pm Re: Load Balancing Question by Steinar Engedahl Rossing on Oct 19, 1999 at 2:22:00 pm Re: Load Balancing Question by Men & Mice Support on Oct 21, 1999 at 1:11:00 pm Load Balancing Question by Steve Dannaway on Apr 20, 2000 at 2:16:06 pm Re: Load Balancing Question by Men & Mice Support on Apr 20, 2000 at 3:37:00 pm Load Balancing question by Dennis J. Bonsall, Jr. on Jun 10, 2000 at 7:00:12 pm Re: Load Balancing question by Men & Mice Support on Jun 10, 2000 at 7:16:14 pm Re: Load Balancing question by Dennis J. Bonsall, Jr. on Jun 10, 2000 at 7:49:55 pm Re: Load Balancing question by Men & Mice Support on Jun 10, 2000 at 10:52:11 pm Load Balancing question by Suzanne Swift on Jul 3, 2002 at 6:19:56 am Re: Load Balancing question by Men & Mice Support on Jul 3, 2002 at 9:20:30 am Re: Load Balancing question by Suzanne Swift on Jul 3, 2002 at 11:57:39 am Re: Load Balancing question by Men & Mice Support on Jul 3, 2002 at 12:22:16 pm Re: Load Balancing question by Suzanne Swift on Jul 3, 2002 at 1:24:14 pm Re: Load Balancing question by Men & Mice Support on Jul 3, 2002 at 4:17:17 pm