How to check slave zone freshness

[Mark Andrews]

With a modern nameserver that supports the expire edns option you can
also do "dig +expire soa zone @server" which will tell you how long
until the zone will expire on this server.

e.g.

;; BADCOOKIE, retrying.

; <<>> DiG 9.11.0pre-alpha <<>> +expire soa . +norec +noauth
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44442
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 11fa29d809bed1e5bad33ed956b8efad9c6914524fd2730f (good)
; EXPIRE: 577179 (6 days 16 hours 19 minutes 39 seconds)
;; QUESTION SECTION:
;.				IN	SOA

;; ANSWER SECTION:
.			86400	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2016020800 1800 900 604800 86400

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Feb 09 06:42:37 EST 2016
;; MSG SIZE  rcvd: 332

Mark

In message <56B8A65A.9030904 at pernau.at>, Klaus Darilion writes:
> 
> 
> Am 08.02.2016 um 14:58 schrieb Tony Finch:
> > Klaus Darilion <klaus.mailinglists at pernau.at> wrote:
> >>
> >> I want to monitor the freshness of my slaves zones. Is it somehow
> >> possible to extract the status of slave-zones from bind?
> > 
> > If you are running 9.10 or later you can use `rndc zonestatus`.
> 
> Ah. Nice, as updating to 9.10 is on my plan.
> 
> I guess I need to iterate over all configured zones, may be a bit slow
> for several thousand zones. I will seee ...
> 
> > I have an older script which just looks at the timestamp of the zone
> > files; BIND bumps the timestamp whenever it successfully refreshes the
> > zone, even if it didn't need to transfer any changes.
> 
> Thanks for the info
> Klaus
> 
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org