There will be two major Toolforge outages this coming week. Each outage
will cause tool downtime and may require manual restarts afterwards.
The first outage is an NFS migration [0] and will take place on Monday,
beginning at around 0:00 UTC and lasting well into the day, possibly as
late as 19:00 UTC. During this long period, Toolforge NFS will be
read-only. This will cause most tools (for example, anything that writes
a log file) to fail.
The second outage will be a database migration [1] and will take place
on Thursday at 17:00UTC. During this window ToolsDBwill be read-only.
This migration should take about an hour but unexpected side-effects may
extend the downtime.
We try very hard to avoid outages of this magnitude, but at this point
we need to choose downtime over the increasing risk of data loss.
More details can be found below.
[0] NFS Outage and system reboots Monday: The existing toolforge NFS
server is running on aging hardware and lacks a straightforward path for
maintenance or upgrading. To improve this we are moving NFS to a
cinder+VM platform which should support easier upgrades, migrations, and
expansions in the future. In order to maintain data integrity during the
migration, the old server will need to be made read-only while the last
set of file changes is synchronized with the new server. Because the NFS
service is actively used, it will take many hours to complete the final
sync.
To ensure stable mounts of the new server, every node in Toolforge will
be rebooted as part of this migration. That means that even tools which
do not use NFS will be affected, although most tools should restart
gracefully.
This task is documented as
https://phabricator.wikimedia.org/T333477.
[1] DB outage Thursday: As part of the ongoing effortto upgrade
user-created Toolforge databases, we willmigrate ToolsDB to a new VM
that will have a more recent version of Debian and MariaDB and will use
a more resilient storage solution.
The new VM is ready, and we plan to point all tools to use it on *Apr, 6
2023 at 17:00 UTC*.
This will involve about *1 hour of read-only time*for the database. Any
existing database connection will be terminated, and if your tool does
not reconnect automatically you might have to restart it manually.
An email will be sent shortly before starting the migration, and when
it's finished.
Please also make sure your tool is connecting to the database using the
canonical hostname *tools.db.svc.wikimedia.cloud*and not any other
hostname or IP address.
For more details, and to report any issue, you can read or leave a
comment at
https://phabricator.wikimedia.org/T333471
For more context you can also check out the parent task
https://phabricator.wikimedia.org/T301949
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