https://bugzilla.wikimedia.org/show_bug.cgi?id=70084
Bug ID: 70084
Summary: DNS can resolve to IPv6 address despite lack of IPv6
connectivity
Product: Wikimedia Labs
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: Infrastructure
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Web browser: ---
Mobile Platform: ---
On deployment-bastion.eqiad.wmflabs we have a job pulling from Gerrit. It
errored out with:
INFO:mwextpull:cwd: /srv/scap-stage-dir/php-master/extensions
INFO:mwextpull:running: git pull
error: Failed to connect to 2620:0:861:3:208:80:154:81: Network is
unreachable while accessing
https://gerrit.wikimedia.org/r/p/mediawiki/extensions.git/info/refs
Ref:
https://integration.wikimedia.org/ci/job/beta-code-update-eqiad/21755/consoleFull
The eth0 has both IPv4 and IPv6 address, the later being a local one only
though:
inet addr:10.68.16.58 Bcast:10.68.23.255 Mask:255.255.248.0
inet6 addr: fe80::f816:3eff:fe85:123f/64 Scope:Link
And:
$ host gerrit.wikimedia.org
gerrit.wikimedia.org has address 208.80.154.81
gerrit.wikimedia.org has IPv6 address 2620:0:861:3:208:80:154:81
$
The workaround would be to force ssh to IPv4 with GIT_SSH='ssh -4'. But there
is probably a better fix that needs to be done in the way instances resolve DNS
entry, they should only use A entry or the DNS server only yield A entries when
queried over IPv4.
A possibility is that ssh first try the IPv4 address, if it fails to connect,
fallback to the next DNS entry which is the IPv6 address. The error message
would mean that the service did not respond properly on the IPv4 address.
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