89 lines
2.9 KiB
ReStructuredText
89 lines
2.9 KiB
ReStructuredText
..
|
|
Copyright (c) 2014 OpenStack Foundation
|
|
|
|
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
|
|
=======================
|
|
|
|
Magnum contains a mechanism whereby developers and system administrators can
|
|
generate a report about the state of a running Magnum 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 Magnum process
|
|
with support (see below). The *GMR* will then be outputted as standard error
|
|
for that particular process.
|
|
|
|
For example, suppose that ``magnum-api`` has process id ``8675``, and was run
|
|
with ``2>/var/log/magnum/magnum-api-err.log``. Then, ``kill -USR2 8675`` will
|
|
trigger the Guru Meditation report to be printed to
|
|
``/var/log/magnum/magnum-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 informations.
|
|
|
|
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:
|
|
|
|
.. code-block:: python
|
|
|
|
from oslo_reports import guru_meditation_report as gmr
|
|
from nova 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
|
|
under :mod:`oslo.reports`
|