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On Thu, 12 Dec 2002, Peter Mueller wrote:
This is what Akamai does. They use BGP table information to build a
network map and then announced DNS information based on the closest
server. For example, I have 3 akamai servers in my network. When I use
DNS to lookup a.1234.akamai.net I get the IP address of my servers. If I
go into some equipment on a different network the same name gives me
different IPs. It is always the IP closest to me network wise.
Go to www.msnbc.com, view source and search for akamai.net You'll see
the reference a799.g.akamai.net. Traceroute to that name from home it
= 63.240.15.152, 12 hops away. From work it is one of my IP's and 2 hops
away :). Pretty cool actually.
Using DNS to load-balance between clusters based on network BGP data.
Then have each cluster setup as a LVS HA cluster to load balance locally.
> > We've never done this before. But if it works, it would sure increase
> > our claimed reliability as we can talk about multihomed,
> > geographically
> > separate, entirely redundant systems.
>
> I think there were a few posts along this thread in the past. There was
> some talk about using BGP with LVS integration using a tool Horms wrote
> called Supersparrow (http://www.supersparrow.org/). I'm not sure if it's
> production ready, but if it was that's your best choice by far. Routing LVS
> connections based on BGP is a great idea!
>
> > My questions are - what do we do with the Linux Director at the main
> > site to have a failover solution. If the internet service to the main
> > site fails, how does the alternate site know to take over receiving
> > requests? Given that it is elsewhere on the WAN, how does the backup
> > site update local routers with the virtual IP? Do we need a
> > backup Linux
>
> If Supersparrow isn't production ready try looking into a DNS / geographic
> solution. I think F5 sells a box that will do this called "3 DNS". Here's
> the link - http://f5.com/f5products/3dns/. I don't know of any open-source
> alternative other than Supersparrow. (FYI Supersparrow's solution would be
> better than 3dns if it worked... BGP rocks!)
>
> > Thanks in advance.
>
> NP, hope it helps
>
> Peter
>
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