Add wsgi script file and sample config

In addition, the port of zun-api is inconsistent. The devstack
script used 9517 and others used 9512. This commit changed to
port 9517 in everywhere.

Implements: blueprint deploy-zun-api-in-wsgi
Change-Id: I08818e417945338d5de5de473f8adc9bf9d63bdc

doc/source/dev/manual-devstack.rst

@@ -146,11 +146,11 @@ Configure the keystone endpoint::
                               --description="Zun Container Service" \
                               container
     openstack endpoint create --region RegionOne container public \
-        http://127.0.0.1:9512/v1
+        http://127.0.0.1:9517/v1
     openstack endpoint create --region RegionOne container internal \
-        http://127.0.0.1:9512/v1
+        http://127.0.0.1:9517/v1
     openstack endpoint create --region RegionOne container admin \
-        http://127.0.0.1:9512/v1
+        http://127.0.0.1:9517/v1
 
 Start the API service in a new screen::
 

doc/source/index.rst

@@ -28,6 +28,7 @@ Contents
    installation
    usage
    contributing
+   mod_wsgi
 
 Indices and tables
 ==================

doc/source/mod_wsgi.rst

@@ -0,0 +1,55 @@
+..
+      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.
+
+===================================
+ Installing the API behind mod_wsgi
+===================================
+
+Zun comes with a few example files for configuring the API
+service to run behind Apache with ``mod_wsgi``.
+
+app.wsgi
+========
+
+The file ``zun/api/app.wsgi`` sets up the V2 API WSGI
+application. The file is installed with the rest of the zun
+application code, and should not need to be modified.
+
+etc/apache2/zun.conf
+======================
+
+The ``etc/apache2/zun.conf`` file contains example settings that
+work with a copy of zun installed via devstack.
+
+.. literalinclude:: ../../../etc/apache2/zun.conf
+
+1. On deb-based systems copy or symlink the file to
+   ``/etc/apache2/sites-available``. For rpm-based systems the file will go in
+   ``/etc/httpd/conf.d``.
+
+2. Modify the ``WSGIDaemonProcess`` directive to set the ``user`` and
+   ``group`` values to an appropriate user on your server. In many
+   installations ``zun`` will be correct. Modify the ``WSGIScriptAlias``
+   directive to set the path of the wsgi script. If you are using devstack,
+   the value should be ``/opt/stack/zun/zun/api/app.wsgi``. In the
+   ``ErrorLog`` and ``CustomLog`` directives, replace ``%APACHE_NAME%`` with
+   ``apache2``.
+
+3. Enable the zun site. On deb-based systems::
+
+      $ a2ensite zun
+      $ service apache2 reload
+
+   On rpm-based systems::
+
+      $ service httpd reload

etc/apache2/zun.conf

@@ -0,0 +1,40 @@
+# 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.
+
+# This is an example Apache2 configuration file for using the
+# zun API through mod_wsgi.
+
+# Note: If you are using a Debian-based system then the paths
+# "/var/log/httpd" and "/var/run/httpd" will use "apache2" instead
+# of "httpd".
+#
+# The number of processes and threads is an example only and should
+# be adjusted according to local requirements.
+
+Listen 9517
+
+<VirtualHost *:9517>
+    WSGIDaemonProcess zun-api user=%USER% group=%GROUP% processes=5 threads=1 display-name=%{GROUP}
+    WSGIScriptAlias / %PUBLICWSGI%
+    WSGIProcessGroup zun-api
+
+    ErrorLog /var/log/%APACHE_NAME%/zun_error.log
+    LogLevel info
+    CustomLog /var/log/%APACHE_NAME%/zun_access.log combined
+
+    <Directory /opt/stack/zun/zun/api>
+        WSGIProcessGroup zun-api
+        WSGIApplicationGroup %{GLOBAL}
+        AllowOverride All
+        Require all granted
+    </Directory>
+</VirtualHost>

zun/api/app.wsgi

@@ -0,0 +1,24 @@
+# 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.
+
+"""Use this file for deploying the API under mod_wsgi.
+See http://pecan.readthedocs.org/en/latest/deployment.html for details.
+"""
+
+import sys
+
+from zun.common import service
+from zun.api import app
+
+# Initialize the oslo configuration library and logging
+service.prepare_service(sys.argv)
+application = app.load_app()

zun/conf/api.py

@@ -16,7 +16,7 @@ from zun.common.i18n import _
 
 api_service_opts = [
     cfg.PortOpt('port',
-                default=9512,
+                default=9517,
                 help='The port for the zun API server.'),
     cfg.IPOpt('host_ip',
               default='127.0.0.1',