问题
I have a domain with 123-reg.co.uk and I've created a TXT record:
I have tried to verify it has been applied by using both the dig and host shell commands, but it appears the TXT record isn't being found.
For example...
host -t txt integralist.co.uk
...returns: integralist.co.uk has no TXT record
At first I assumed it might be a TTL issue and so I tried to use dig to query one of the authoritative name servers directly (thus avoiding a TTL caching concern), like so
dig txt integralist.co.uk @ns.123-reg.co.uk.
...but this returns no ANSWER section.
I'm not sure what I'm missing in order to side step any TTL/propagation issues that might be preventing me from querying an authoritative name server directly and seeing the record.
Note: It's currently 4pm Mon 12th Oct 2015 and I added the TXT record around 9am this morning, so by the time someone replies any propagation time frame preventing the record from appearing when querying the domain may well have passed
回答1:
DNS records (contrary to popular belief) don't propagate, they are being cached (and that is why sometimes you have to wait for the cache to expire when you make DNS changes). That being said, when you create a new record there was nothing in the cache to expire, so new records should be visible immediately.
Now, to shed some light on your issue, everything is working exactly as you configured it:
; <<>> DiG 9 <<>> @8.8.8.8 my-service-description.integralist.co.uk TXT
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1490
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;my-service-description.integralist.co.uk. IN TXT
;; ANSWER SECTION:
my-service-description.integralist.co.uk. 14399 IN TXT "integralist.co.uk is a tech blog"
;; Query time: 39 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Oct 12 19:48:28 2015
;; MSG SIZE rcvd: 103
Maybe you wanted to create TXT record for the zone apex:
@ TXT "integralist.co.uk is a tech blog"
来源：https://stackoverflow.com/questions/33084192/how-to-query-authoritative-name-server-to-side-step-propagation-times