The slow march to update labs dns will hit a few milestones this week.
If all goes well, labs users won't notice anything at all. If we run
into trouble there may be brief outages; if you notice an outage please
notify me immediately.
2015-06-02: Starting tomorrow, new instances will use the new dns
system by default.
2015-06-02 through -05: During the week, Yuvi will be moving a few
critical hosts (proxies, mostly) over to the new system.
2015-06-09: On Monday I'll switch remaining instances to the new system.
If you have an instance using self-hosted puppet, today is a good day to
rebase your puppet code so that you're set up to cope with these
changes. Honestly, every day is a good day to rebase your puppet code :)
Details, for the technically interested:
During each of the above steps, sets of instances will be moved over to
using a new dns server. That server is named
'labs-recursor0.wikimedia.org' and uses pdns-recursor. Pdns-recursor is
backed in turn by a pdns implementation running on the same server. The
records in pdns are populated via openstack designate-sink, a tool which
hooks instance creation and creates an A record.
Use of the old (dnsmasq) system is maintained via the puppet setting
'use_dnsmasq'. So when I say I'm 'moving' an instance, in reality I'm
just removing the use_dnsmasq flag.
The new system supports old-school names (name.eqiad.wmflabs) as well as
project-qualified names (name.projectname.eqiad.wmflabs) and also
supports rudimentary reverse lookups.
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