1618283 - DNS tiles.services.mozilla.com has no A record

Status: RESOLVED FIXED

(Data Platform and Tools Graveyard :: Operations, defect)

Description

[nrostagni]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:72.0) Gecko/20100101 Firefox/72.0

Steps to reproduce:

$ dig @8.8.8.8 tiles.services.mozilla.com

; <<>> DiG 9.16.0 <<>> @8.8.8.8 tiles.services.mozilla.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53447
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;tiles.services.mozilla.com. IN A

;; ANSWER SECTION:
tiles.services.mozilla.com. 54 IN CNAME tiles.r53-2.services.mozilla.com.

;; AUTHORITY SECTION:
r53-2.services.mozilla.com. 118 IN SOA ns-1507.awsdns-60.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

;; Query time: 4 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: mer. févr. 26 19:06:39 CET 2020
;; MSG SIZE rcvd: 163

Actual results:

no A answer in response

Expected results:

expected A answer in response

Comment 1

[nrostagni]

.. same with your current authoritative server

$ dig @ns-1507.awsdns-60.org. tiles.r53-2.services.mozilla.com.

; <<>> DiG 9.16.0 <<>> @ns-1507.awsdns-60.org. tiles.r53-2.services.mozilla.com.
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45761
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;tiles.r53-2.services.mozilla.com. IN A

;; AUTHORITY SECTION:
r53-2.services.mozilla.com. 300 IN SOA ns-1507.awsdns-60.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

;; Query time: 8 msec
;; SERVER: 205.251.197.227#53(205.251.197.227)
;; WHEN: mer. févr. 26 19:15:10 CET 2020
;; MSG SIZE rcvd: 143

According to https://securitytrails.com/domain/tiles.services.mozilla.com/history/a
last seen ( 2020-02-20 ) 5 days ago

confuses browser ( & proxies ) that still issue lots of reqs.

could not see any news about end of this service

Comment 2

[nrostagni]

related to https://bugzilla.mozilla.org/show_bug.cgi?id=1594143 ?

Comment 3

[Nan Jiang [:nanj]]

:nrostagni - Hi, thanks for the report!

Just a little bit context. tiles.services.mozilla.com was the endpoint for the Tiles data pipeline used for Activity Stream and Messaging System. As we had migrated all the telemetry from AWS to GCP in Firefox 72, the Tiles pipeline was decommissioned in Bug 1594143. We're aware that once the pipeline is torn down, all the old Firefox versions won't be able to reach the endpoint, and we will lose the telemetry from that group. And in Firefox (<=71), the impact would be that it will log an error in the browser console, but it won't affect other functionalities.

Please let me know if you have any other concerns about this change.

Thanks!

Comment 4

[Jason Thomas [:jason]]

We should clean up these records. :jbuck can you assist?

Comment 5

[nrostagni]

thanks four your reply.

the concern is a nasty side effect on http connexions trough proxy ( such as squid ) observed :

• unwanted queries on proxies and FF connexion engine, that keep and cache context for an unreachable/half-resolvable URL with looong timeout ( > 80s )
• DNS cache / negative cache pollution for everybody

can you reply NXDOMAIN ( = remove the CNAME entry ) , instead of CNAME that points to .. nothing ?

Regards,

Comment 6

[Jon Buckley [:jbuck]]

Hi there, thanks for reporting this bug! I guess the domain names weren't in the cloudformation templates that I deleted to decommission the service - I've manually deleted the domains and it now correctly returns NXDOMAIN:

$ dig @8.8.8.8 tiles.services.mozilla.com

; <<>> DiG 9.10.6 <<>> @8.8.8.8 tiles.services.mozilla.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 11590
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;tiles.services.mozilla.com.	IN	A

;; AUTHORITY SECTION:
services.mozilla.com.	897	IN	SOA	ns-679.awsdns-20.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

;; Query time: 2 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Feb 27 16:53:03 EST 2020
;; MSG SIZE  rcvd: 136