test-net-dns-custom-lookup failing on many machines

[rvagg]

One for @evanlucas I think, see https://jenkins-iojs.nodesource.com/job/iojs+any-pr+multi/591/ - perhaps make it more flexible than just ::1 as some similar tests are.

[rvagg]

(edited to say that it's failing on many machines, I just happened to be focusing on Ubuntu 15.04 as a new addition and assumed this was a new failure)

[evanlucas]

On it. Can I get access to be able to kick off a build?

[evanlucas]

hm I must be missing something. It looks like some of those machines are unable to resolve localhost. Getting ENOTFOUND error. It seems like more tests would be failing if that is the case though...

[rvagg]

I think @jbergstroem was recently tackling this with the FreeBSD machines, related perhaps?

[evanlucas]

Very well could be. The ones in particular I was looking at are the Ubuntu boxes. https://jenkins-iojs.nodesource.com/job/iojs+any-pr+multi/nodes=ubuntu1204-64/607/tapTestReport/test.tap-460/.

Wonder if it's possible that they do not really support IPv6?

[rvagg]

eth0      Link encap:Ethernet  HWaddr 04:01:38:31:df:01  
          inet addr:104.131.89.49  Bcast:104.131.127.255  Mask:255.255.192.0
          inet6 addr: fe80::601:38ff:fe31:df01/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:11608277 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14097153 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:4108361600 (4.1 GB)  TX bytes:3687280248 (3.6 GB)

also in /etc/hosts:

127.0.0.1   localhost
::1     ip6-localhost ip6-loopback

[evanlucas]

ahh that could be it. The test is trying to lookup localhost as an IPv6 address. Should I maybe add a check like in https://github.com/iojs/io.js/blob/master/test/parallel/test-net-connect-options-ipv6.js#L14-L19 before trying the running the test for IPv6?

[rvagg]

yes, or you could use ip6-localhost as a fallback case, it's fairly common on Linux I think

[wolfeidau]

@rvagg what is that hosts file from? as it looks incorrect.

This is from a 14.04 host for example, from what i understand ::1 and 127.0.0.1 should point to localhost. see http://tools.ietf.org/html/rfc6761#section-6.3

127.0.0.1   localhost
127.0.1.1   crusty

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

As long as the work around "falls back" that should be ok, but ip6-localhost isn't configured on OSX for example, see the hosts file below.

##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1   localhost
255.255.255.255 broadcasthost
::1             localhost

[jbergstroem]

I'm not sure if this is distro default, but yeah - I can confirm that hosts lack a ::1 record for localhost.

[jbergstroem]

@rvagg said:
I think @jbergstroem was recently tackling this with the FreeBSD machines, related perhaps?

That's slightly different. In FreeBSD jails we couldn't control routing of 127.0.0.1 which means there were no way of handling the situation other than passing an expected result -- in that case through an environment variable. In this case I'd suggest we do as mentioned above, edit hosts to add a ipv6 default for localhost.