dns not resolving without an internet connection under Yosemite

[mjroeleveld]

Since I have a new retina Macbook (late 2013, instead of my old late 2011 model), dnsmasq isn't working anymore when I am not connected to the internet. I saw you already implemented what should be a solution, but apparently this doesn't work for me.

The weird thing is, that I installed Aegir on a fresh Mavericks installation (which also ran on my previous Macbook), so I would guess that the problem lies in the hardware configuration; the new macbook has no longer an ethernet connection, only wireless.

The wireless adapter uses 127.0.0.1 as DNS, so that is not the source of the problem.

Any ideas?

[BrianGilbert]

^ this fixed it for me

[mjroeleveld]

Thanks, did it for me as well.

[brentratliff]

I ran the script after this commit and still have this problem.

[BrianGilbert]

Looks like this is due to a change in Yosemite, I can confirm it's happening again..

10007 > scutil --dns
DNS configuration

resolver #1
  nameserver[0] : 192.168.0.1
  if_index : 4 (en3)
  flags    : Request A records
  reach    : Reachable,Directly Reachable Address

resolver #2
  domain   : ld
  nameserver[0] : 127.0.0.1
  flags    : Request A records, Request AAAA records
  reach    : Reachable,Local Address

DNS configuration (for scoped queries)

resolver #1
  nameserver[0] : 192.168.0.1
  if_index : 4 (en3)
  flags    : Scoped, Request A records
  reach    : Reachable,Directly Reachable Address
[/etc/resolver]
[brian]
10008 > scutil --dns
No DNS configuration available

[BrianGilbert]

When connected to network:

10008 > dns-sd -G v4  aegir.ld
DATE: ---Wed 10 Dec 2014---
13:57:45.011  ...STARTING...
Timestamp     A/R Flags if Hostname                               Address                                      TTL
13:57:45.012  Add     2  0 aegir.ld.                              127.0.0.1                                    15

When disconnected

10009 > dns-sd -G v4  aegir.ld
DATE: ---Wed 10 Dec 2014---
13:57:56.497  ...STARTING...
Timestamp     A/R Flags if Hostname                               Address                                      TTL
13:57:56.498  Add     2  0 aegir.ld.                              0.0.0.0                                      60   No Such Record

[BrianGilbert]

also http://apple.stackexchange.com/questions/74639/do-etc-resolver-files-work-in-mountain-lion-for-dns-resolution#comment172533_82006

[BrianGilbert]

It looks like there won't be a quick fix for this.. multiple reports of this problem on the interwebs as of Yosemite

[BrianGilbert]

Supposed workaround: Enable your Ad-Hoc Wifi Network. (though it only appeared to allow terminal based DNS stuff, not browser)

[brentratliff]

That's confirmed. Browser definitely doesn't work. I have to do a lot of my work offline so I'm kind of stuck at the moment. I may have to have MAMP configure the sites off the same codebase for offline use.

[BrianGilbert]

@brentratliff you can always add a manual entry to /etc/hosts , that at least stops you from having to install another full stack.. I have a meeting with apple genius next weekend to see if this can get resolved.

[BrianGilbert]

you could also try this.. https://github.com/joedj/yosemite_dnsfix (didn't appear to work for me though)

[brentratliff]

I have been adding them in /etc/hosts. I meant to post that here for others. It wasn't working the first time I added them, so I looked into MAMP, but worked after a reboot.

[BrianGilbert]

@brentratliff to flush your local DNS execute the following (so you don't need to reboot when adding new host file entries)

sudo discoveryutil mdnsflushcache;sudo discoveryutil udnsflushcaches

[BrianGilbert]

This has been escalated to Apple engineers by myself and I am awaiting a response, a workaround that I've confirmed works (but am not electing to use myself) is available at: http://arstechnica.com/apple/2015/01/why-dns-in-os-x-10-10-is-broken-and-what-you-can-do-to-fix-it

[mjroeleveld]

Hmm, I don't think I want to take that risk either. Did you get a response?

[BrianGilbert]

Still awaiting a response, you can still use OSX Aegir, you'll just need to add a manual hosts entry for any hosts you want to access while disconnected.

[mjroeleveld]

Yes, I know. I still do all Drupal development on OSX Aegir. Indeed, for every site that I need to access offline, I add a line in the hosts file. Not ideal, but it works.

[BrianGilbert]

Response from applecare is that engineers said it's "Expected behaviour" no idea if they will ever fix it.. here is video I made showing the issue (no resolver available when you are disconnected from networks).

https://www.youtube.com/watch?v=3m9OI_AjCx8

https://news.ycombinator.com/item?id=8969581

[mjroeleveld]

Well, that's the second time I experience such behavior from Apple. Half a year ago they screwed me by not providing a solution for my fried #MacbookPro2011 and now this. I'm starting to dislike the company more and more.

[dave0783]

Any update on this?

[BrianGilbert]

@dave0783 supposedly you can workaround this using a loopback device, I've just not had enough time to try and figure it out.

[BrianGilbert]

Resolved as of 10.10.4 (14E26a), Apple have changed back to mDNSResponder instead of discoveryd!