openstack/masakari
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Masakari developer's documentation

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Added documentation for how to get involved, development qucikstart
and masakari system architecture.

Change-Id: Ie2cbdde7698a79a1b996e485d141eb15dbded4cd
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Abhishek Kekane 2017-08-01 15:12:14 +05:30 committed by Abhishek Kekane
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..
Copyright 2017 NTT DATA
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.
Masakari System Architecture
============================
Masakari is comprised of two services api and engine, each performing different
functions. The user-facing interface is a REST API, while internally Masakari
communicates via an RPC message passing mechanism.
The API servers process REST requests, which typically involve database
reads/writes, sending RPC messages to other Masakari engine,
and generating responses to the REST calls.
RPC messaging is done via the **oslo.messaging** library,
an abstraction on top of message queues.
Masakari engine will run on same host where masakari api is running, and have
a `manager` that is listening for `RPC` messages.
The manager also, optionally, has periodic tasks.
Components
----------
Below you will find a helpful explanation of the key components
of a typical Masakari deployment.
.. image:: ./images/architecture.png
:width: 100%
* DB: sql database for data storage.
* API: component that receives HTTP requests, converts commands and
communicates with masakari engine via the **oslo.messaging** queue.
* Engine: Executes recovery workflow and communicates with nova via HTTP.

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============
Contributing
============
.. include:: ../../CONTRIBUTING.rst

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..
Copyright 2017 NTT DATA
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.
======================
Development Quickstart
======================
This page describes how to setup and use a working Python development
environment that can be used in developing masakari on Ubuntu.
These instructions assume you're already familiar with git.
Following these instructions will allow you to build the documentation
and run the masakari unit tests.
.. note:: For how to contribute to Masakari, see
`How To Contribute <http://docs.openstack.org/infra/manual/developers.html>`_.
Masakari uses the Gerrit code review system,
See `Gerrit Workflow <http://docs.openstack.org/infra/manual/developers.html#development-workflow>`_.
Setup
=====
There are two ways to create a development environment: using
DevStack, or explicitly installing and cloning just what you need.
Using DevStack
--------------
To enable Masakari in DevStack, perform the following steps:
Download DevStack
~~~~~~~~~~~~~~~~~
.. sourcecode:: bash
export DEVSTACK_DIR=~/devstack
git clone git://git.openstack.org/openstack-dev/devstack.git $DEVSTACK_DIR
Enable the Masakari plugin
~~~~~~~~~~~~~~~~~~~~~~~~~~
Enable the plugin by adding the following section to ``$DEVSTACK_DIR/local.conf``
.. sourcecode:: bash
[[local|localrc]]
enable_plugin masakari git://git.openstack.org/openstack/masakari
Optionally, a git refspec (branch or tag or commit) may be provided as follows:
.. sourcecode:: bash
[[local|localrc]]
enable_plugin masakari git://git.openstack.org/openstack/masakari <refspec>
Run the DevStack utility
~~~~~~~~~~~~~~~~~~~~~~~~
.. sourcecode:: bash
cd $DEVSTACK_DIR
./stack.sh
Explicit Install/Clone
----------------------
DevStack installs a complete OpenStack environment. Alternatively,
you can explicitly install and clone just what you need for Masakari
development.
Getting the code
~~~~~~~~~~~~~~~~
Grab the code from git::
git clone https://git.openstack.org/openstack/masakari
cd masakari
Linux Systems
~~~~~~~~~~~~~
The first step of this process is to install the system (not Python)
packages that are required. Following are instructions on how to do
this on Linux.
On Debian-based distributions (e.g., Debian/Mint/Ubuntu)::
sudo apt-get install python-pip
sudo pip install tox
tox -e bindep
sudo apt-get install <indicated missing package names>
Building the Documentation
==========================
Install the prerequisite packages: graphviz
To do a full documentation build, issue the following command while
the masakari directory is current.
.. code-block:: bash
tox -e docs
That will create a Python virtual environment, install the needed
Python prerequisites in that environment, and build all the
documentation in that environment.
Running unit tests
==================
See `Running Python Unit Tests <https://docs.openstack.org/project-team-guide/project-setup/python.html#running-python-unit-tests>`_.

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..
Copyright 2017 NTT DATA
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.
.. _getting_involved:
========================================
How to get (more) involved with Masakari
========================================
So you want to get more involved with Masakari? Or you are new to Masakari and
wondering where to start?
We are working on building easy ways for you to get help and ideas on
how to learn more about Masakari and how the Masakari community works.
How do I get started?
=====================
There are quite a few global docs on this:
- http://www.openstack.org/assets/welcome-guide/OpenStackWelcomeGuide.pdf
- https://wiki.openstack.org/wiki/How_To_Contribute
- http://www.openstack.org/community/
There is more general info, non Masakari specific info here:
- https://wiki.openstack.org/wiki/Mentors
- https://wiki.openstack.org/wiki/OpenStack_Upstream_Training
What should I work on?
~~~~~~~~~~~~~~~~~~~~~~
So you are starting out your Masakari journey, where is a good place to
start?
If you'd like to learn how Masakari works before changing anything
(good idea!), we recommend looking for reviews with -1s and -2s and seeing
why they got down voted. Once you have some understanding, start reviewing
patches. It's OK to ask people to explain things you don't understand. It's
also OK to see some potential problems but put a +0.
Once you're ready to write code, take a look at some of the work already marked
as low-hanging fruit:
* https://bugs.launchpad.net/masakari/+bugs?field.tag=low-hanging-fruit
How do I get my feature in?
~~~~~~~~~~~~~~~~~~~~~~~~~~~
The best way of getting your feature in is... well it depends.
First concentrate on solving your problem and/or use case, don't fixate
on getting the code you have working merged. It’s likely things will need
significant re-work after you discuss how your needs match up with all
the existing ways Masakari is currently being used. The good news, is this
process should leave you with a feature that's more flexible and doesn't
lock you into your current way of thinking.
A key part of getting code merged, is helping with reviewing other
people's code. Great reviews of others code will help free up more core
reviewer time to look at your own patches. In addition, you will
understand how the review is thinking when they review your code.
Also, work out if any ongoing efforts are blocking your feature and
helping out speeding those up. The spec review process should help with
this effort.
For more details on our process, please see: :ref:`process`.
What is expected of a good contributor?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TODO - need more info on this
Top Tips for working with the Masakari community
================================================
Here are some top tips around engaging with the Masakari community:
- IRC
- we talk a lot in #openstack-masakari
- do ask us questions in there, and we will try to help you
- not sure about asking questions? feel free to listen in around
other people's questions
- we recommend you setup an IRC bouncer:
https://wiki.openstack.org/wiki/IRC
- Email
- Use the [masakari] tag in the mailing lists
- Filtering on [masakari] and [all] can help tame the list
- Be Open
- i.e. don't review your teams code in private, do it publicly in
gerrit
- i.e. be ready to talk about openly about problems you are having,
not "theoretical" issues
- that way you can start to gain the trust of the wider community
- Got a problem? Please ask!
- Please raise any problems and ask questions early
- we want to help you before you are frustrated or annoyed
- unsure who to ask? Just ask in IRC.
- Talk about problems first, then solutions
- Don't think about "merging your patch", instead think about
"solving your problem"
- conversations are more productive that way
- It's not the decision that's important, it's the reason behind it that's
important
- Don't like the way the community is going?
- Please ask why we were going that way, and please engage with the
debate
- If you don't, we are unable to learn from what you have to offer
- No one will decide, this is stuck, who can help me?
- it's rare, but it happens
- ...but if you don't ask, it's hard for them to help you
Process
=======
It can feel like you are faced with a wall of process. We are a big
community, to make sure the right communication happens, we do use a
minimal amount of process.
If you find something that doesn't make sense, please:
- ask questions to find out \*why\* it happens
- if you know of a better way to do it, please speak up
- one "better way" might be to remove the process if it no longer helps
To learn more about Masakari's process, please read :ref:`process`.
Why bother with any process?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Why is it worth creating a bug or blueprint to track your code review?
This may seem like silly process, but there is usually a good reason
behind it.
We have lots of code to review, and we have tools to try and get to
really important code reviews first. If yours is really important, but
not picked up by our tools, it's possible you just get lost in the bottom
of a big queue.
If you have a bug fix, you have done loads of work to identify the
issue, and test out your fix, and submit it. By adding a bug report, you
are making it easier for other folks who hit the same problem to find
your work, possibly saving them the hours of pain you went through. With
any luck that gives all those people the time to fix different bugs, all
that might have affected you, if you had not given them the time go fix
it.
It's similar with blueprints. You have worked out how to scratch your
itch, lets tell others about that great new feature you have added, so
they can use that. Also, it stops someone with a similar idea going
through all the pain of creating a feature only to find you already have
that feature ready and up for review, or merged into the latest release.
Hopefully this gives you an idea why we have applied a small layer of
process to what we are doing. Having said all this, we need to unlearn
old habits to move forward, there may be better ways to do things, and
we are open to trying them. Please help be part of the solution.
.. _why_plus1:
Why do code reviews if I am not in masakari-core?
=================================================
Code reviews are the life blood of the developer community.
There is a good discussion on how you do good reviews, and how anyone
can be a reviewer:
http://docs.openstack.org/infra/manual/developers.html#peer-review
In the draft process guide, I discuss how doing reviews can help get
your code merged faster: :ref:`process`.
Let’s look at some of the top reasons why participating with code reviews
really helps you:
- Doing more reviews, and seeing what other reviewers notice, will help
you better understand what is expected of code that gets merged into
master
- Having more non-core people do great reviews, leaves less review work
for the core reviewers to do, so we are able get more code merged
- Empathy is one of the keys to a happy community. If you are used to
doing code reviews, you will better understand the comments you get
when people review your code. As you do more code reviews, and see
what others notice, you will get a better idea of what people are
looking for when then apply a +2 to your code.
What are the most useful types of code review comments? Well here are a
few to the top ones:
- Fundamental flaws are the biggest thing to spot. Does the patch break
a whole set of existing users, or an existing feature?
- Consistency of behavior is really important. Does this bit of code
do things differently to where similar things happen elsewhere in
Masakari?
- Is the code easy to maintain, well tested and easy to read? Code is
read order of magnitude times more than it is written, so optimize
for the reader of the code, not the writer.
Let's look at some problems people hit when starting out doing code
reviews:
- My +1 doesn't mean anything, why should I bother?
- So your +1 really does help. Some really useful -1 votes that lead
to a +1 vote helps get code into a position
- When to use -1 vs 0 vs +1
- Please see the guidelines here:
http://docs.openstack.org/infra/manual/developers.html#peer-review
- I have already reviewed this code internally, no point in adding a +1
externally?
- Please talk to your company about doing all code reviews in the
public, that is a much better way to get involved. Showing how the
code has evolved upstream, is much better than trying to 'perfect'
code internally, before uploading for public review. You can use
Draft mode, and mark things as WIP if you prefer, but please do
the reviews upstream.
- Where do I start? What should I review?
- There are various tools, but a good place to start is:
https://etherpad.openstack.org/p/masakari-pike-workitems
- Depending on the time in the cycle, it's worth looking at
NeedsCodeReview blueprints:
https://blueprints.launchpad.net/masakari/
- Maybe take a look at things you want to see merged, bug fixes and
features, or little code fixes
- Look for things that have been waiting a long time for a review:
- If you get through the above lists, try other tools, such as:
http://status.openstack.org/reviews
How to do great code reviews?
=============================
http://docs.openstack.org/infra/manual/developers.html#peer-review
For more tips, please see: `Why do code reviews if I am not in masakari-core?`_
How do I become masakari-core?
==============================
You don't have to be masakari-core to be a valued member of the Masakari
community. There are many, many ways you can help. Every quality review
that helps someone get their patch closer to being ready to merge helps
everyone get their code merged faster.
The first step to becoming masakari-core is learning how to be an active
member of the Masakari community, including learning how to do great code
reviews.
If you feel like you have the time to commit to all the masakari-core
membership expectations, reach out to the Masakari PTL who will be
able to find you an existing member of masakari-core to help mentor you. If
all goes well, and you seem like a good candidate, your mentor will
contact the rest of the masakari-core team to ask them to start looking at
your reviews, so they are able to vote for you, if you get nominated for
join masakari-core.
We encourage all mentoring, where possible, to occur on #openstack-masakari
so everyone can learn and benefit from your discussions.
The above mentoring is available to everyone who wants to learn how to
better code reviews, even if you don't ever want to commit to becoming
masakari-core. If you already have a mentor, that's great, the process is
only there for folks who are still trying to find a mentor. Being
admitted to the mentoring program no way guarantees you will become a
member of masakari-core eventually, it's here to help you improve, and help
you have the sort of involvement and conversations that can lead to
becoming a member of masakari-core.

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<text x="195.5178" xml:space="preserve" y="-871.639" clip-path="url(#clipPath2)" stroke="none">a feature?</text>
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.. masakari documentation master file, created by
sphinx-quickstart on Tue Jul 9 22:26:36 2013.
You can adapt this file completely to your liking, but it should at least
contain the root `toctree` directive.
..
Copyright 2017 NTT DATA
Welcome to masakari's documentation!
========================================================
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
Contents:
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.
=======================================================
Welcome to Masakari's developer/operator documentation!
=======================================================
Masakari is an OpenStack project designed to assure high availability of
instances and compute processes running on hosts.
The developer documentation provided here is continually kept up-to-date
based on the latest code, and may not represent the state of the project at
any specific prior release.
This documentation is intended to help explain what the Masakari developers
think is the current scope of the Masakari project, as well as the
architectural decisions we have made in order to support that scope. We also
document our plans for evolving our architecture over time. Finally, we
documented our current development process and policies.
Masakari API References
=======================
The Masakari API is quite large, we provide a concept guide which
gives some of the high level details, as well as a more detailed API
reference.
To generate API reference guide issue the following command while
the masakari directory is current.
.. code-block:: bash
$ tox -e api-ref
Developer Guide
===============
If you are new to Masakari, this should help you start to understand what
masakari actually does, and why.
.. toctree::
:maxdepth: 2
:maxdepth: 1
readme
installation
usage
contributing
how_to_get_involved
architecture
development.environment
Indices and tables
==================
* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`

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============
Installation
============
At the command line::
$ pip install masakari
Or, if you have virtualenvwrapper installed::
$ mkvirtualenv masakari
$ pip install masakari

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..
Copyright 2017 NTT DATA
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.
.. _process:
=====================
Masakari team process
=====================
Masakari is always evolving its processes, but it's important to explain why we
have them: so we can all work to ensure that the interactions we need to
happen do happen. The process exists to make productive communication between
all members of our community easier.
OpenStack Wide Patterns
=======================
Masakari follows most of the generally adopted norms for OpenStack projects.
You can get more details here:
* http://docs.openstack.org/infra/manual/developers.html
* http://docs.openstack.org/project-team-guide/
If you are new to Masakari, please read this first: :ref:`getting_involved`.
How do I get my code merged?
============================
OK, so you are new to Masakari, and you have been given a feature to
implement. How do I make that happen?
You can get most of your questions answered here:
- http://docs.openstack.org/infra/manual/developers.html
But let's put a Masakari specific twist on things...
Overview
~~~~~~~~
.. image:: ./images/Masakari_spec_process.svg
:alt: Flow chart showing the Masakari bug/feature process
Where do you track bugs?
~~~~~~~~~~~~~~~~~~~~~~~~
We track bugs here:
- http://bugs.launchpad.net/masakari
If you fix an issue, please raise a bug so others who spot that issue
can find the fix you kindly created for them.
Also before submitting your patch it's worth checking to see if someone
has already fixed it for you (Launchpad helps you with that, at little,
when you create the bug report).
When do I need a blueprint vs. a spec?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
To understand this question, we need to understand why blueprints and
specs are useful.
But here is the rough idea:
- if it needs a spec, it will need a blueprint.
- if it's an API change, it needs a spec.
- if it's a single small patch that touches a small amount of code,
with limited deployer and doc impact, it probably doesn't need a
spec.
If you are unsure, please ask PTL or one of the other
masakari-core on IRC.
How do I get my blueprint approved?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
So you need your blueprint approved? Here is how:
- if you don't need a spec, please add a link to your blueprint to the
agenda for the next masakari meeting:
https://wiki.openstack.org/wiki/Meetings/Masakari
- be sure your blueprint description has enough context for the
review in that meeting.
- if you need a spec, then please submit a masakari-spec for review.
Got any more questions? Contact samP or one of the other
masakari-core who are awake at the same time as you. IRC is best as
you will often get an immediate response, if they are too busy send
him/her an email.
How do I get a procedural -2 removed from my patch?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When feature freeze hits, any patches for blueprints that are still in review
get a procedural -2 to stop them merging. In Masakari a blueprint is only
approved for a single release. To have the -2 removed, you need to get the
blueprint approved for the current release
(see `How do I get my blueprint approved?`_).
My code review seems stuck, what can I do?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
First and foremost - address any -1s and -2s! A few tips:
- Be precise. Ensure you're not talking at cross purposes.
- Try to understand where the reviewer is coming from. They may have a
very different perspective and/or use-case to you.
- If you don't understand the problem, ask them to explain - this is
common and helpful behavior.
- Be positive. Everyone's patches have issues, including core
reviewers. No-one cares once the issues are fixed.
- Try not to flip-flop. When two reviewers are pulling you in different
directions, stop pushing code and negotiate the best way forward.
- If the reviewer does not respond to replies left on the patchset,
reach out to them on IRC or email. If they still don't respond, you
can try to ask their colleagues if they're on holiday (or simply
wait). Finally, you can ask for mediation in the Masakari meeting by
adding it to the agenda
(https://wiki.openstack.org/wiki/Meetings/Masakari). This is also what
you should do if you are unable to negotiate a resolution to an
issue.
Eventually you should get some +1s from people working through the
review queue. Expect to get -1s as well. You can ask for reviews within
your company, 1-2 are useful (not more), especially if those reviewers
are known to give good reviews. You can spend some time while you wait
reviewing other people's code - they may reciprocate and you may learn
something (:ref:`Why do code reviews when I'm not core? <why_plus1>`).
If you've waited an appropriate amount of time and you haven't had any
+1s, you can ask on IRC for reviews. Please don't ask for core review
straight away, especially not directly (IRC or email). Core reviewer
time is very valuable and gaining some +1s is a good way to show your
patch meets basic quality standards.
Once you have a few +1s, be patient. Remember the average wait times.
You can ask for reviews each week in IRC, it helps to ask when cores are
awake.
Bugs
----
It helps to apply correct tracking information.
- Put "Closes-Bug", "Partial-Bug" or "Related-Bug" in the commit
message tags as necessary.
- If you have to raise a bug in Launchpad first, do it - this helps
someone else find your fix.
- Make sure the bug has the correct priority and tag set.
Features
--------
Again, it helps to apply correct tracking information. For
blueprint-only features:
- Put your blueprint in the commit message, EG "blueprint
simple-feature".
- Mark the blueprint as NeedsCodeReview if you are finished.
- Maintain the whiteboard on the blueprint so it's easy to understand
which patches need reviews.
- Use a single topic for all related patches. All patches for one
blueprint should share a topic.
For blueprint and spec features, do everything for blueprint-only
features and also:
- If it's a project or subteam priority, add it to:
https://etherpad.openstack.org/p/masakari-pike-workitems
- Ensure your spec is approved for the current release cycle.
If it's not a priority, your blueprint/spec has been approved for the
cycle and you have been patient, you can raise it during the Masakari
meeting. The outcome may be that your spec gets unapproved for the
cycle, so that priority items can take focus. If this happens to you,
sorry - it should not have been approved in the first place, Masakari team
bit off more than they could chew, it is their mistake not yours. You
can re-propose it for the next cycle.
If it's not a priority and your spec has not been approved, your code
will not merge this cycle. Please re-propose your spec for the next
cycle.

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.. include:: ../../README.rst

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========
Usage
========
To use masakari in a project::
import masakari

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coverage report
[testenv:docs]
commands = python setup.py build_sphinx
basepython = python2.7
commands =
python setup.py build_sphinx
[testenv:releasenotes]
commands =