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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <title>DevStack - Plugins</title>
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+    <meta name="author" content="">
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+      <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-&lt;name&gt;</code> where <code>&lt;name&gt;</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>&copy; Openstack Foundation 2011-2013 &mdash; 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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