opendev/system-config
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Merge "Add Zuul restart documentation"

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Jenkins 2016-04-04 07:34:40 +00:00 committed by Gerrit Code Review
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doc/source/zuul.rst
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@ -97,3 +97,52 @@ host keys as the zuul user. e.g.::
sudo su - zuul
ssh -p 29418 review.openstack.org
Restarts
--------
Zuul restarts are disruptive, so non-emergency restarts should always be
scheduled for quieter times of the day, week and cycle. To be as
courteous to developers as possible, just prior to a restart the `Zuul
Status Page <http://status.openstack.org/zuul/>`_ should be checked to
see the status of the gate. If there is a series of changes nearly
merged, wait until that has been completed.
Since Zuul is stateless, some work needs to be done to save and then
re-enqueue patches when restarts are done. To accomplish this, start by
running `zuul-changes.py
<https://git.openstack.org/cgit/openstack-infra/zuul/tree/tools/zuul-changes.py>`_
to save the check and gate queues::
python /opt/zuul/tools/zuul-changes.py http://zuul.openstack.org \
check >check.sh
python /opt/zuul/tools/zuul-changes.py http://zuul.openstack.org \
gate >gate.sh
These check.sh and gate.sh scripts will be used after the restart to
re-enqueue the changes.
Now use `service zuul stop` to stop zuul and then run ps to make sure
the process has actually stopped, it may take several seconds for it to
finally go away.
With Zuul stopped, delete all the used nodes in nodepool. Wait for one
of each variety to come up before using `service zuul start` to start
zuul again.
Once Zuul is started, run netcat against localhost 4730 port to confirm
that all the node types (particularly the uncommon ones) are registered
with Gearman before re-enqueuing patches. For instance::
echo "status" | nc localhost 4730 | grep :centos7
When you are satisfied that all the node types have returned, first run
the gate.sh script and then check.sh to re-enqueue the changes from
before the restart::
./gate.sh
./check.sh
You may watch the `Zuul Status Page
<http://status.openstack.org/zuul/>`_ to confirm that changes are
returning to the queues.