[knot-dns-users] Weighted records

Hi there! At work, we make use something often referred to as "weighted records", a feature offered by many managed DNS vendors. We use it to implement e.g. a canary environment, where we test changes on a small portion of production traffic. I played around with knot-dns for a bit (quite impressed), and figured it might be nice to implement such a feature for it. Turns out, the code is so amazing that if you abuse the infrastructure of the geoip module, it only takes an hour (very impressed). If you are interested in trying it, read on further below, but just to state my intention: I was wondering if such a feature would be of interest at all? I realize the geoip module may not be the appropriate for such an implementation, consider this merely a demo of sorts. So here goes nothing: 1. apply attached patch 2. config file snippet: mod-geoip: - id: test config-file: /etc/knot/test.conf ttl: 600 mode: weighted zone: - domain: example.com. file: "/var/lib/knot/example.com.zone" module: mod-geoip/test 3. /etc/knot/test.conf: lb.example.com: - weight: 10 CNAME: www1.example.com. - weight: 5 CNAME: www2.example.com. Results in this: conrad@deltree ~/hack/knot-dns $ for i in $(seq 1 100); do dig @192.168.1.242 A lb.example.com +short; done | sort | uniq -c 68 www1.example.com. 32 www2.example.com. conrad@deltree ~/hack/knot-dns $ for i in $(seq 1 100); do dig @192.168.1.242 A lb.example.com +short; done | sort | uniq -c 72 www1.example.com. 28 www2.example.com. conrad@deltree ~/hack/knot-dns $ for i in $(seq 1 100); do dig @192.168.1.242 A lb.example.com +short; done | sort | uniq -c 66 www1.example.com. 34 www2.example.com. You get the idea. Anyways, any thoughts and feedback would be greatly appreciated. Thanks a lot, Conrad