On 18/01/2014 09:49, Alec Warner wrote: > On Fri, Jan 17, 2014 at 11:10 PM, Alan McKinnon <alan.mckin...@gmail.com > <mailto:alan.mckin...@gmail.com>> wrote: > > On 18/01/2014 09:04, Patrick Lauer wrote: > >> which could link to the > >> > infra page would be good here perhaps, so when an outage > occurred ( at > >> > least on the web side ) appropriate links to infra could be given. > > The more sane fix would be low DNS TTL and rotating DNS to a different > > IP if things are down. > > > > > > > That is already in place: > > $ dig overlays.gentoo.org <http://overlays.gentoo.org> > > ; <<>> DiG 9.9.4 <<>> overlays.gentoo.org <http://overlays.gentoo.org> > ;; global options: +cmd > ;; Got answer: > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49989 > ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1 > > ;; OPT PSEUDOSECTION: > ; EDNS: version: 0, flags:; udp: 4000 > ;; QUESTION SECTION: > ;overlays.gentoo.org <http://overlays.gentoo.org>. IN A > > ;; ANSWER SECTION: > overlays.gentoo.org <http://overlays.gentoo.org>. 600 IN > CNAME spoonbill.gentoo.org <http://spoonbill.gentoo.org>. > spoonbill.gentoo.org <http://spoonbill.gentoo.org>. 604800 IN > A 81.93.255.5 > > > > 5 minutes downtime max if a switch needs to be done. > 5 minutes is perfectly acceptable IMHO > > > infra TTL standards are 60 minutes for service CNAMEs and 30 minutes for > HA CNAMES. The TTL is 600 here (which is 10 minutes, not 5) because I > lowered it on 1/14 in anticipation of a machine failover, it was > previously 2 hours.
Thanks for the clarification. Obviously I ran dig after you'd made the change. 60 mins is still acceptable for a CNAME IMHO. Wait one hour max to be able to sync in event of a change is not at all unreasonable. -- Alan McKinnon alan.mckin...@gmail.com
