"Splitting traffic evenly" may not be in the interest of your clients - suppose their locations are skewed?
In any case, this seems like a lot of work - including committing to ongoing maintenance - for not much gain. Consider setting up an anycast address - let the network do the work. This will route to the server closest to the client. You can do this with two DNS servers - pair each with a webserver, have the zone file select the corresponding webserver. And/Or the webservers - works well for static content; there's a distributed DB challenge. (It might be nice if someone with experience could write an end-to-end tutorial on how to do this - from obtaining a suitable address - at a reasonable cost - to setting up the BGP routing to the servers...) Of course the simplest way out is to use a CDN - as this is a previously solved problem. It trades money for effort, which may be worthwhile if it allows you to concentrate on your unique value proposition. Timothe Litt ACM Distinguished Engineer -------------------------- This communication may not represent the ACM or my employer's views, if any, on the matters discussed. On 22-Feb-20 20:25, Scott A. Wozny wrote: > Greetings BIND gurus, > > I’m setting up hot-hot webserver clusters hosted on the west and east > coasts of the US and would like to use Bind 9.11.4 with the Maxmind > GeoIP database to split the traffic about evenly between those > clusters. Most of the traffic will be from the US so what I would > like most to do is set up my ACLs to use the longitude parameter in > the city DB and send traffic less than X (let's say -85) to a zone > file that prioritizes the west coast servers and those greater than X > to the east coast servers. However, when I look through the 9.11.4 > ARM it doesn’t include the longitude field in the geoip available > field list in section 7.1. Has anyone tried this and it actually > works as an undocumented feature or, because it’s not an “exact match” > type operation, this is a non-starter? > > If this isn’t an option at all, does anyone have any suggestions on > how to get a reasonably close split with ACLs using the geoIP > database? My first thought is to do continent based assignments to > west and east coast zone files for all the non North American IPs with > country based assignments of the non-US North American countries and > then region (which, in the US, I believe translates to states) based > assignments within the US. I would need to do some balancing, but it > seems fairly straightforward. The downside is that the list would be > fairly long and ACLs in most software can be kind of a performance hit. > > The other alternative I was considering was doing splits by time zone, > but there are a little over 400 TZs in the MaxMind GeoLite DB last > time I checked and that also seems like it would be a performance hit > UNLESS I could use wildcards in the ACL to group overseas time zones. > While I’ve not seen a wildcard in a geoip ACL, that doesn’t > necessarily mean it can’t be done so I was wondering if anyone was > able to make that work. > > Finally, I could try a hybrid of continent matches outside North > America and then the North American timezones which seems like a > reasonable compromise, but only if my preferred options of longitude < > > isn’t available nor is wildcarding tz matches. OR am I overthinking > all of this and there is a simple answer for splitting my load that I > haven’t thought of? The documentation and examples available online > are fairly limited so I thought I’d check with the people most likely > to have actually done this. > > Any thoughts or suggestions would be appreciated. > > Thanks, > > Scott
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