cinder/doc/source/devref/gmr.rst
Sean McGinnis a77335012f Update docs to generate Guru Meditation Report
Guru Meditation Reports (GMR) code in oslo.reports was recently updated
to expect SIGUSR2 as opposed to SIGUSR1, because it is reserved by
Apache 'mod_wsgi' for its own use.

Signal was changed and merged in change:
I9d3b6079ba2cca41fe4723723a6f80b2c3c0b9c0

Change-Id: Id58dd3c32b095f4c6b14caf650d36f2fc7dfb12c
2015-10-21 17:41:06 -05:00

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Copyright (c) 2013 OpenStack Foundation
All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may
not use this file except in compliance with the License. You may obtain
a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations
under the License.
Guru Meditation Reports
=======================
Cinder contains a mechanism whereby developers and system administrators can
generate a report about the state of a running Cinder executable.
This report is called a *Guru Meditation Report* (*GMR* for short).
Generating a GMR
----------------
A *GMR* can be generated by sending the *USR2* signal to any Cinder process
with support (see below).
The *GMR* will then be outputted standard error for that particular process.
For example, suppose that ``cinder-api`` has process id ``8675``, and was run
with ``2>/var/log/cinder/cinder-api-err.log``.
Then, ``kill -USR2 8675`` will trigger the Guru Meditation report to be printed
to ``/var/log/cinder/cinder-api-err.log``.
Structure of a GMR
------------------
The *GMR* is designed to be extensible; any particular executable may add
its own sections. However, the base *GMR* consists of several sections:
Package
Shows information about the package to which this process belongs,
including version information
Threads
Shows stack traces and thread ids for each of the threads within this process
Green Threads
Shows stack traces for each of the green threads within this process
(green threads don't have thread ids)
Configuration
Lists all the configuration options currently accessible via the CONF object
for the current process
Adding Support for GMRs to New Executables
------------------------------------------
Adding support for a *GMR* to a given executable is fairly easy.
First import the module (currently residing in oslo-incubator), as well as the
Cinder version module:
.. code-block:: python
from oslo_reports import guru_meditation_report as gmr
from cinder import version
Then, register any additional sections (optional):
.. code-block:: python
TextGuruMeditation.register_section('Some Special Section',
some_section_generator)
Finally (under main), before running the "main loop" of the executable
(usually ``service.server(server)`` or something similar), register the *GMR*
hook:
.. code-block:: python
TextGuruMeditation.setup_autorun(version)
Extending the GMR
-----------------
As mentioned above, additional sections can be added to the GMR for a
particular executable. For more information, see the inline documentation
about oslo.reports:
`oslo.reports <http://docs.openstack.org/developer/oslo.reports/>`_