54b9732339
The hand-maintained static HTML docs for DevStack have been in a GitHub gh-pages branch; move them into the master branch in preparation for hosting them in openstack.org infrastructure. By default tools/build_docs.sh now builds the static HTML output into docs/html. Change-Id: Ide5f7d980a294c7a9f8a3decaed0939f1c239934
137 lines
6.1 KiB
HTML
137 lines
6.1 KiB
HTML
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="utf-8">
|
|
<title>DevStack - Plugins</title>
|
|
<meta name="description" content="">
|
|
<meta name="author" content="">
|
|
|
|
<!-- Le HTML5 shim, for IE6-8 support of HTML elements -->
|
|
<!--[if lt IE 9]>
|
|
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
|
|
<![endif]-->
|
|
|
|
<!-- Le styles -->
|
|
<link href="assets/css/bootstrap.css" rel="stylesheet">
|
|
<link href="assets/css/local.css" rel="stylesheet">
|
|
<style type="text/css">
|
|
body { padding-top: 60px; }
|
|
dd { padding: 10px; }
|
|
</style>
|
|
|
|
<!-- Le javascripts -->
|
|
<script src="assets/js/jquery-1.7.1.min.js" type="text/javascript" charset="utf-8"></script>
|
|
<script src="assets/js/bootstrap.js" type="text/javascript" charset="utf-8"></script>
|
|
</head>
|
|
|
|
<body>
|
|
|
|
<div class="navbar navbar-fixed-top">
|
|
<div class="navbar-inner">
|
|
<div class="container">
|
|
<a class="brand" href="/">DevStack</a>
|
|
<ul class="nav pull-right">
|
|
<li><a href="overview.html">Overview</a></li>
|
|
<li><a href="changes.html">Changes</a></li>
|
|
<li><a href="faq.html">FAQ</a></li>
|
|
<li><a href="http://github.com/openstack-dev/devstack">GitHub</a></li>
|
|
<li><a href="https://review.openstack.org/#/q/status:open+project:openstack-dev/devstack,n,z">Gerrit</a></li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div class="container" id="home">
|
|
|
|
<section id="faq" class="span12">
|
|
|
|
<div class='row pull-left'>
|
|
<h2>Plugins <small>Add stuff</small></h2>
|
|
<p>DevStack has a couple of plugin mechanisms to allow easily adding support for additional projects and features.</p>
|
|
|
|
<h3>Extras.d Hooks</h3>
|
|
<p>These relatively new hooks are an extension of the existing calls from <code>stack.sh</code> at the end of its run, plus <code>unstack.sh</code> and <code>clean.sh</code>. A number of the higher-layer projects are implemented in DevStack using this mechanism.</p>
|
|
|
|
<p>The script in <code>extras.d</code> is expected to be mostly a dispatcher to functions in a <code>lib/*</code> script. The scripts are named with a zero-padded two digits sequence number prefix to control the order that the scripts are called, and with a suffix of <code>.sh</code>. DevSack reserves for itself the sequence numbers 00 through 09 and 90 through 99.</p>
|
|
|
|
<p>Below is a template that shows handlers for the possible command-line arguments:</p>
|
|
|
|
<pre>
|
|
# template.sh - DevStack extras.d dispatch script template
|
|
|
|
# check for service enabled
|
|
if is_service_enabled template; then
|
|
|
|
if [[ "$1" == "source" ]]; then
|
|
# Initial source of lib script
|
|
source $TOP_DIR/lib/template
|
|
fi
|
|
|
|
if [[ "$1" == "stack" && "$2" == "install" ]]; then
|
|
# Perform installation of service source
|
|
echo_summary "Installing Template"
|
|
install_template
|
|
|
|
elif [[ "$1" == "stack" && "$2" == "post-config" ]]; then
|
|
# Configure after the other layer 1 and 2 services have been configured
|
|
echo_summary "Configuring Template"
|
|
configure_template
|
|
|
|
elif [[ "$1" == "stack" && "$2" == "extra" ]]; then
|
|
# Initialize and start the template service
|
|
echo_summary "Initializing Template"
|
|
##init_template
|
|
fi
|
|
|
|
if [[ "$1" == "unstack" ]]; then
|
|
# Shut down template services
|
|
# no-op
|
|
:
|
|
fi
|
|
|
|
if [[ "$1" == "clean" ]]; then
|
|
# Remove state and transient data
|
|
# Remember clean.sh first calls unstack.sh
|
|
# no-op
|
|
:
|
|
fi
|
|
fi
|
|
</pre>
|
|
|
|
<p>The arguments are:
|
|
<ul>
|
|
<li><strong>source</strong> - Called by each script that utilizes <code>extras.d</code> hooks; this replaces directly sourcing the <code>lib/*</code> script.</li>
|
|
<li><strong>stack</strong> - Called by <code>stack.sh</code> three times for different phases of its run:
|
|
<ul>
|
|
<li><strong>install</strong> - Called after the layer 1 and 2 projects source and their dependencies have been installed.</li>
|
|
<li><strong>post-config</strong> - Called after the layer 1 and 2 services have been configured. All configuration files for enabled services should exist at this point.</li>
|
|
<li><strong>extra</strong> - Called near the end after layer 1 and 2 services have been started. This is the existing hook and has not otherwise changed.</li>
|
|
</ul></li>
|
|
<li><strong>unstack</strong> - Called by <code>unstack.sh</code> before other services are shut down.</li>
|
|
<li><strong>clean</strong> - Called by <code>clean.sh</code> before other services are cleaned, but after <code>unstack.sh</code> has been called.
|
|
</ul></p>
|
|
|
|
|
|
<h3>Hypervisor</h3>
|
|
<p>Hypervisor plugins are fairly new and condense most hypervisor configuration into one place.</p>
|
|
|
|
<p>The initial plugin implemented was for Docker support and is a useful template for the required support. Plugins are placed in <code>lib/nova_plugins</code> and named <code>hypervisor-<name></code> where <code><name></code> is the value of <code>VIRT_DRIVER</code>. Plugins must define the following functions:</p>
|
|
<ul>
|
|
<li><code>install_nova_hypervisor</code> - install any external requirements</li>
|
|
<li><code>configure_nova_hypervisor</code> - make configuration changes, including those to other services</li>
|
|
<li><code>start_nova_hypervisor</code> - start any external services</li>
|
|
<li><code>stop_nova_hypervisor</code> - stop any external services</li>
|
|
<li><code>cleanup_nova_hypervisor</code> - remove transient data and cache</li>
|
|
</ul>
|
|
</div>
|
|
|
|
</section>
|
|
|
|
<footer>
|
|
<p>© Openstack Foundation 2011-2013 — An <a href="https://wiki.openstack.org/wiki/Programs">OpenStack program</a> created by <a href="http://www.rackspace.com/cloud/private_edition/">Rackspace Cloud Builders</a></p>
|
|
</footer>
|
|
|
|
</div> <!-- /container -->
|
|
</body>
|
|
</html>
|