Merge "Add README.md and LICENSE"

This commit is contained in:
Jenkins 2015-10-15 11:26:09 +00:00 committed by Gerrit Code Review
commit d7f052ecc8
2 changed files with 378 additions and 0 deletions

176
LICENSE Normal file
View File

@ -0,0 +1,176 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
represent, as a whole, an original work of authorship. For the purposes
of this License, Derivative Works shall not include works that remain
separable from, or merely link (or bind by name) to the interfaces of,
the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including
the original version of the Work and any modifications or additions
to that Work or Derivative Works thereof, that is intentionally
submitted to Licensor for inclusion in the Work by the copyright owner
or by an individual or Legal Entity authorized to submit on behalf of
the copyright owner. For the purposes of this definition, "submitted"
means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems,
and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work, but
excluding communication that is conspicuously marked or otherwise
designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity
on behalf of whom a Contribution has been received by Licensor and
subsequently incorporated within the Work.
2. Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.
3. Grant of Patent License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
(except as stated in this section) patent license to make, have made,
use, offer to sell, sell, import, and otherwise transfer the Work,
where such license applies only to those patent claims licensable
by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted. If You
institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
modifications, and in Source or Object form, provided that You
meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
that You distribute, all copyright, patent, trademark, and
attribution notices from the Source form of the Work,
excluding those notices that do not pertain to any part of
the Derivative Works; and
(d) If the Work includes a "NOTICE" text file as part of its
distribution, then any Derivative Works that You distribute must
include a readable copy of the attribution notices contained
within such NOTICE file, excluding those notices that do not
pertain to any part of the Derivative Works, in at least one
of the following places: within a NOTICE text file distributed
as part of the Derivative Works; within the Source form or
documentation, if provided along with the Derivative Works; or,
within a display generated by the Derivative Works, if and
wherever such third-party notices normally appear. The contents
of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
notices within Derivative Works that You distribute, alongside
or as an addendum to the NOTICE text from the Work, provided
that such additional attribution notices cannot be construed
as modifying the License.
You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
for any such Derivative Works as a whole, provided Your use,
reproduction, and distribution of the Work otherwise complies with
the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
origin of the Work and reproducing the content of the NOTICE file.
7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied, including, without limitation, any warranties or conditions
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.

202
README.md Normal file
View File

@ -0,0 +1,202 @@
fuel-agent README
=================
## Table of Contents
- [Overview](#overview)
- [Structure](#structure)
- [Usage](#usage)
- [Development](#development)
- [Core Reviewers](#core-reviewers)
- [Contributors](#contributors)
## Overview
fuel-agent is nothing more than just a set of data driven executable
scripts.
- One of these scripts is used for building operating system images. One can run
this script on wherever needed passing a set of repository URIs and a set of
package names that are to be installed into the image.
- Another script is used for the actual provisioning. This script being installed
into a ramdisk (live image) can be run to provision an operating system on a hard drive.
When running one needs to pass input data that contain information about disk
partitions, initial node configuration, operating system image location, etc.
This script is to prepare disk partitions according to the input data, download
operating system images and put these images on partitions.
### Motivation
- Native operating installation tools like anaconda and debian-installer are:
* hard to customize (if the case is really non-trivial)
* hard to troubleshoot (it is usually quite difficult to understand which log file
contains necessary information and how to run those tools in debug mode)
- Image based approach to operating system installation allows to make this
process really scalable. For example, we can use BitTorrent based image
delivery scheme when provisioning that makes the process easily scalable up
to thousands of nodes.
- When provisioning we can check hash sum of the image and use other validation
mechanisms that can make the process more stable.
### Designed to address requirements
- Support various input data formats (pluggable input data drivers)
- Support plain partitions, lvm, md, root on lvm, etc.
- Be able to do initial node configuration (network, mcollective, puppet, ntp)
- Be able to deploy standalone OS (local kernel, local bootloader)
- Support various image storages (tftp, http, torrent)
- Support various image formats (compressed, disk image, fs image, tar image)
### Design outline
- Use cloud-init for initial node configuration
- Avoid using parted and lvm native python bindings (to make it easy to
troubleshoot and modify for deployment engineers)
- No REST API, just executable entry points (like /usr/bin/fa_*)
- Passing input data either via file (--input_data_file) or CLI parameter (--input_data)
- Detailed logging of all components
## Structure
### Basic Repository Layout
```
fuel-agent
├── cloud-init-templates
├── contrib
├── debian
├── etc
├── fuel_agent
│   ├── cmd
│   ├── drivers
│   ├── objects
│   ├── openstack
│   ├── tests
│   ├── utils
├── openstack-common.conf
├── README.md
├── LICENSE
├── requirements.txt
├── run_tests.sh
├── setup.cfg
├── setup.py
├── specs
├── test-requirements.txt
```
### root
The root level contains important repository documentation and license information.
It also contais files which are typical for the infracture of python project such
as requirements.txt and setup.py
### cloud-init-templates
This folder contains Jinja2 templates to prepare [cloud-init](https://cloudinit.readthedocs.org/en/latest/) related data for [nocloud](http://cloudinit.readthedocs.org/en/latest/topics/datasources.html#no-cloud) [datasource](http://cloudinit.readthedocs.org/en/latest/topics/datasources.html#what-is-a-datasource).
### contrib
This directory contains third party code that is not a part of fuel-agent itself but
can be used together with fuel-agent.
### debian
This folder contains the DEB package specification.
Included debian rules are mainly suitable for Ubuntu 12.04 or higher.
### etc
This folder contains the sample config file for fuel-agent. Every parameter is well documented.
We use oslo-config as a configuration module.
### fuel_agent
This folder contains the python code: drivers, objects, unit tests and utils, manager and entry points.
- fuel_agent/cmd/agent.py
* That is where executable entry points are. It reads input data and
instantiates Manager class with these data.
- fuel_agent/manager.py
* That is the file where the top level agent logic is implemented.
It contains all those methods which do something useful (do_*)
- fuel_agent/drivers
* That is where input data drivers are located.
(Nailgun, NailgunBuildImage, Simple etc.)
Data drivers convert json into a set of python objects.
- fuel_agent/objects
* Here is the place where python objects are defined. fuel-agent manager
does not understand any particular data format except these objects.
For example, to do disk partitioning we need PartitionScheme object.
PartitionScheme object in turn contains disk labels, plain partitions,
lvm, md, fs objects. This PartitionScheme object is to be created by input
data driver.
- fuel_agent/utils
* That is the place where we put the code which does something useful on the OS
level. Here we have simple parted, lvm, md, grub bindings, etc.
### specs
This folder contains the RPM package specfication file.
Included RPM spec is mainly suitable for Centos 6.x or higher.
## Usage
### Use case #1 (Fuel)
fuel-agent is used in Fuel project as a part of operating system provisioning scheme.
When a user starts deployment of OpenStack cluster, the first task is to install
an operating system on slave nodes. First, Fuel runs fuel-agent on the master node
to build OS images. Once images are built, Fuel then runs fuel-agent on slave nodes
using Mcollective. Slave nodes are supposed to be booted with so called bootstrap ramdisk.
Bootstrap ramdisk is an in-memory OS where fuel-agent is installed.
Detailed documentation on this case is available here:
* [Image based provisionig](https://docs.mirantis.com/openstack/fuel/fuel-master/reference-architecture.html#image-based-provisioning)
* [fuel-agent](https://docs.mirantis.com/openstack/fuel/fuel-master/reference-architecture.html#fuel-agent)
* [Operating system provisioning](https://docs.mirantis.com/openstack/fuel/fuel-master/reference-architecture.html#operating-system-provisioning)
* [Image building](https://docs.mirantis.com/openstack/fuel/fuel-master/reference-architecture.html#image-building)
### Use case #2 (Independent on Fuel)
fuel-agent can easily be used in third party projects as a convenient operating system
provisioning tool. As described above fuel-agent is fully data driven and supports
various input data formats using pluggable input data drivers. Currently there are three
input data drivers available. Those are
- NailgunBuildImage and Nailgun
* Build image and provisioning input data drivers used in Fuel project. To use them
independently read Fuel documentation.
- NailgunSimpleDriver
* fuel-agent native partitioning input data driver. It is just a de-serializer for
fuel-agent PartitionScheme object.
In order to be able to use another specific data format one can implement his own data
driver and install it independently. fuel-agent uses stevedore to find installed drivers.
A new driver needs to be exposed via fuel_agent.driver setuptools name space. See for example
setup.cfg file where entry points are defined.
One can also take a look at ```contrib``` directory for some additional examples.
### How to install
fuel-agent can be installed either using RPM/DEB packages or using ```python setup.py install```.
## Development
fuel-agent currently is a subproject of Fuel project. So, we follow the same development
practices as Fuel itself.
* [Fuel Development Documentation](https://docs.fuel-infra.org/fuel-dev/)
* [Fuel How to Contribute](https://wiki.openstack.org/wiki/Fuel/How_to_contribute)
## Core Reviewers
* [fuel-agent cores](https://review.openstack.org/#/admin/groups/995,members)
## Contributors
* [Stackalytics](http://stackalytics.com/?release=all&project_type=all&module=fuel-agent&metric=commits)