tl;dr: Minor change to DNS resolution[0] for toolforge and cloud-vps
services are coming on Monday. Should have no effect but please yell if
you see things break.
The whole story:
Back in 2020[1] we stopped associated new VMs with the .wmflabs
top-level domain; since then all VMs have been accessed via
.wikimedia.cloud instead. As of a few weeks ago, the last remaining
.wmflabs VM was deleted, so we're now cleaning up code and config that
supported that domain.
Right now if you try to resolve a stand-alone hostname (e.g. by typing
"ping mycoolserver") the resolver will try three different fqdns: first
'mycoolserver.<projectname>.eqiad1.wikimedia.cloud.' and, failing that,
'mycoolserver.<projectname>.eqiad.wmflabs.' and, failing that, the
simple name 'mycoolserver.'.
After Monday, that second fallback won't happen, so it'll either be
'mycoolserver.<projectname>.eqiad1.wikimedia.cloud.' or 'mycoolserver.'.
Most people don't use simple hostnames anyway; for those users this
change will have no effect. Some toolforge applications still use the
old-fashioned 'tools-redis' or 'tools-db' hostnames; we already have
changes in place to resolve those correctly after the change. If there
are single hostname edge cases that I don't know about and can't find,
their behavior may change or break in surprising ways.
Note that fully qualified service names (for example
gurwiki.analytics.db.svc.eqiad.wmflabs) are unaffected by this update. I
would love to eliminate them too, but it's unclear how to identify and
remove all uses so that cleanup will be left for another day.
[0] https://gerrit.wikimedia.org/r/c/operations/puppet/+/1118151
[1]
https://wikitech.wikimedia.org/wiki/News/2020_Phasing_out_the_.wmflabs_domain
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