Turning down expiration times for a maintenance isn't unusual. It allows sites to redirect everyone to an alternate location for a very short duration.
As for an anycast, I doubt that would be cost effective. After all the Foundation gets upwards of 400mil unique visitors a month and (I've heard) roughly 12 billion hits. DnsMadeEasy is one of the bigger any cast sites and their biggest listed plan [1] is 50mil queries a month for $125 + as low as 1.60 for each million after that. So that would be something like $20,000 a month (give or take, not every hit would require a new query due to caching, but that's worse case). That isn't a huge number, but the Foundation will soon have 3 separate data centers to answer DNS from, and it only costs a few servers every few years. -Jon On Tue, May 24, 2011 at 07:27, William Allen Simpson < [email protected]> wrote: > Today, for those of us paying attention from the outside, the downtime > became impossible to monitor. One problem is that the TTL on the DNS > server and maintenance records themselves is set much too short! > > Maybe you never thought you'd be inaccessible for an hour? > > Any chance master records could be moved to an anycast DNS provider? > > The SOA is pretty reasonable: > > wikimedia.org. 86400 IN SOA ns0.wikimedia.org. > hostmaster.wikimedia.org. 2011052410 43200 7200 1209600 600 > > But the actual records are all 1 hour, so they disappeared during > the downtime. And ganglia, while it looks OK: > > ns0.wikimedia.org. 3600 IN A 208.80.152.130 > ns1.wikimedia.org. 3600 IN A 208.80.152.142 > ns2.wikimedia.org. 3600 IN A 91.198.174.4 > > secure.wikimedia.org. 3600 IN A 208.80.152.134 > > ganglia.wikimedia.org. 3600 IN CNAME spence.wikimedia.org. > spence.wikimedia.org. 3600 IN A 208.80.152.161 > > Had completely timed out in both my local cache and the Google servers > while I was looking at it, and wasn't able to contact a NS anywhere to > refresh. Here's the last time I saw it: > > ganglia.wikimedia.org. 473 IN CNAME spence.wikimedia.org. > spence.wikimedia.org. 473 IN A 208.80.152.161 > > ;; Query time: 2 msec > ;; SERVER: 10.0.1.1#53(10.0.1.1) > ;; WHEN: Tue May 24 10:06:13 2011 > > ganglia.wikimedia.org. 287 IN CNAME spence.wikimedia.org. > spence.wikimedia.org. 287 IN A 208.80.152.161 > > ;; Query time: 68 msec > ;; SERVER: 8.8.8.8#53(8.8.8.8) > ;; WHEN: Tue May 24 10:09:19 2011 > > _______________________________________________ > Wikitech-l mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/wikitech-l > -- Jon [[User:ShakataGaNai]] / KJ6FNQ http://snowulf.com/ http://ipv6wiki.net/ _______________________________________________ Wikitech-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikitech-l
