Re: [gentoo-dev] overlays.gentoo.org restoration & post-mortem

[Alan McKinnon]

On 18/01/2014 09:49, Alec Warner wrote:
> On Fri, Jan 17, 2014 at 11:10 PM, Alan McKinnon <alan.mckinnon@×××××.com
> <mailto:alan.mckinnon@×××××.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.mckinnon@×××××.com