0cbddea50d
In order to build in the Infra system, we'd like to be able to reuse the existing doc build macros. To support that, move docs/source to doc/source and docs/html to doc/build/html. Change-Id: Ibd8e8e82e54c69b182120df67e6ec6908fed2908
143 lines
6.4 KiB
HTML
143 lines
6.4 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>DevStack - Plugins</title>
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<meta name="description" content="">
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<meta name="author" content="">
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<!-- Le HTML5 shim, for IE6-8 support of HTML elements -->
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<!--[if lt IE 9]>
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<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
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<![endif]-->
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<!-- Le styles -->
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<link href="assets/css/bootstrap.css" rel="stylesheet">
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<link href="assets/css/local.css" rel="stylesheet">
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<style type="text/css">
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body { padding-top: 60px; }
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dd { padding: 10px; }
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</style>
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<!-- Le javascripts -->
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<script src="assets/js/jquery-1.7.1.min.js" type="text/javascript" charset="utf-8"></script>
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<script src="assets/js/bootstrap.js" type="text/javascript" charset="utf-8"></script>
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</head>
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<body>
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<div class="navbar navbar-fixed-top">
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<div class="navbar-inner">
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<div class="container">
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<a class="brand" href="/">DevStack</a>
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<ul class="nav pull-right">
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<li><a href="overview.html">Overview</a></li>
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<li><a href="changes.html">Changes</a></li>
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<li><a href="faq.html">FAQ</a></li>
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<li><a href="http://github.com/openstack-dev/devstack">GitHub</a></li>
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<li><a href="https://review.openstack.org/#/q/status:open+project:openstack-dev/devstack,n,z">Gerrit</a></li>
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</ul>
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</div>
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</div>
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</div>
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<div class="container" id="home">
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<section id="faq" class="span12">
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<div class='row pull-left'>
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<h2>Plugins <small>Add stuff</small></h2>
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<p>DevStack has a couple of plugin mechanisms to allow easily adding support for additional projects and features.</p>
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<h3>Extras.d Hooks</h3>
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<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>
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<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>
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<p>Below is a template that shows handlers for the possible command-line arguments:</p>
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<pre>
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# template.sh - DevStack extras.d dispatch script template
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# check for service enabled
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if is_service_enabled template; then
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if [[ "$1" == "source" ]]; then
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# Initial source of lib script
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source $TOP_DIR/lib/template
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fi
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if [[ "$1" == "stack" && "$2" == "pre-install" ]]; then
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# Set up system services
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echo_summary "Configuring system services Template"
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install_package cowsay
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elif [[ "$1" == "stack" && "$2" == "install" ]]; then
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# Perform installation of service source
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echo_summary "Installing Template"
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install_template
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elif [[ "$1" == "stack" && "$2" == "post-config" ]]; then
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# Configure after the other layer 1 and 2 services have been configured
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echo_summary "Configuring Template"
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configure_template
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elif [[ "$1" == "stack" && "$2" == "extra" ]]; then
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# Initialize and start the template service
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echo_summary "Initializing Template"
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##init_template
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fi
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if [[ "$1" == "unstack" ]]; then
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# Shut down template services
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# no-op
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:
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fi
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if [[ "$1" == "clean" ]]; then
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# Remove state and transient data
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# Remember clean.sh first calls unstack.sh
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# no-op
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:
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fi
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fi
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</pre>
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<p>The arguments are:
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<ul>
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<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>
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<li><strong>stack</strong> - Called by <code>stack.sh</code> three times for different phases of its run:
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<ul>
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<li><strong>pre-install</strong> - Called after system (OS) setup is complete and before project source is installed.</li>
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<li><strong>install</strong> - Called after the layer 1 and 2 projects source and their dependencies have been installed.</li>
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<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>
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<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>
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</ul></li>
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<li><strong>unstack</strong> - Called by <code>unstack.sh</code> before other services are shut down.</li>
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<li><strong>clean</strong> - Called by <code>clean.sh</code> before other services are cleaned, but after <code>unstack.sh</code> has been called.
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</ul></p>
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<h3>Hypervisor</h3>
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<p>Hypervisor plugins are fairly new and condense most hypervisor configuration into one place.</p>
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<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>
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<ul>
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<li><code>install_nova_hypervisor</code> - install any external requirements</li>
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<li><code>configure_nova_hypervisor</code> - make configuration changes, including those to other services</li>
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<li><code>start_nova_hypervisor</code> - start any external services</li>
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<li><code>stop_nova_hypervisor</code> - stop any external services</li>
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<li><code>cleanup_nova_hypervisor</code> - remove transient data and cache</li>
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</ul>
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</div>
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</section>
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<footer>
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<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>
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</footer>
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</div> <!-- /container -->
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</body>
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</html>
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