Benjamin Smith wrote: >Using multiple A records is good for performance balancing, but what if one of >the systems fails? > >Using your cocnfiguration, the delivering mail server has an "a" record and a >single MX, so it wouldn't try the other mail server in the case of a failure, >right? > >Whereas, by listing multiple IPs and mx1/mx2, wouldn't the delivering mail >server try the other address? > >Thanks, > >-Ben > >On Tuesday 25 October 2005 16:02, you wrote: > > >>I once did this and it worked great: >> >> IN MX 10 mx.example.com. >> >>mx IN A 192.168.1.1 >> IN A 192.168.1.2 >> >>...etc. Perfect DNS load balancing. >> >>Jack >> >>Benjamin Smith wrote: >> >> >> >>>Currently, we have two mail relays for inbound messages, and a third for >>> >>> >POP. > > >>>The inbound messages go thru all the CPU-intensive anti-spam stuff, and >>> >>> >then > > >>>they relay it to the POP server for pickup. >>> >>>Currently, one of these is the "primary", and the other is "secondary", and >>>I'd like them to be considered more or less as equals, since the "primary" >>>system is getting beaten pretty hard. >>> >>>The DNS zone file says something like this: >>> >>>############################### >>>@isp.com >>><SNIP> >>> IN MX 100 mx1.isp.com. >>> IN MX 1100 mx2.isp.com. >>><SNIP >>>################################ >>> >>>I seem to recall that I make them act as "equals" by simply changing this >>> >>> >to > > >>>############################### >>>@isp.com >>><SNIP> >>> IN MX 100 mx1.isp.com. >>> IN MX 100 mx2.isp.com. >>><SNIP >>>################################ >>> >>>so that they both get about the same amount of inbound messages. Has >>> >>> >anybody > > >>>here actually done this? How well does this work as far as failover if >>> >>> >either > > >>>system fails? >>> >>>-Ben >>>-- >>>"The best way to predict the future is to invent it." >>>- XEROX PARC slogan, circa 1978 >>>_______________________________________________ >>>CentOS mailing list >>>CentOS at centos.org >>>http://lists.centos.org/mailman/listinfo/centos >>> >>> >>> >>> > > > In addition to the entire Cyrus system, we have 3 MX records. All are set to 0 with the exception of the lists server, which is set to 10. -- Nathaniel Hall, GSEC -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20051025/3d477564/attachment-0004.html>