Installing the API Behind mod_wsgi¶
Ceilometer comes with a few example files for configuring the API
service to run behind Apache with mod_wsgi
.
app.wsgi¶
The file ceilometer/api/app.wsgi
sets up the V2 API WSGI
application. The file is installed with the rest of the ceilometer
application code, and should not need to be modified.
etc/apache2/ceilometer¶
The etc/apache2/ceilometer
file contains example settings that
work with a copy of ceilometer installed via devstack.
# Copyright (c) 2013 New Dream Network, LLC (DreamHost)
#
# 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
# ceilometer API through mod_wsgi. This version assumes you are
# running devstack to configure the software.
<VirtualHost *>
WSGIDaemonProcess ceilometer-api user=vagrant group=vagrant processes=2 threads=10
WSGIScriptAlias / /opt/stack/ceilometer/ceilometer/api/app.wsgi
SetEnv APACHE_RUN_USER vagrant
SetEnv APACHE_RUN_GROUP vagrant
WSGIProcessGroup ceilometer-api
ErrorLog /var/log/apache2/ceilometer_error.log
LogLevel warn
CustomLog /var/log/apache2/ceilometer_access.log combined
</VirtualHost>
Copy or symlink the file to
/etc/apache2/sites-available
.Modify the
VirtualHost
directive, setting a hostname or IP for the service. The default settings assume that the ceilometer API is the only service running on the local Apache instance, which conflicts with Horizon’s default configuration.Modify the
WSGIDaemonProcess
directive to set theuser
andgroup
values to a user available on your server.Modify the
APACHE_RUN_USER
andAPACHE_RUN_GROUP
values to the name of a user and group available on your server.Enable the ceilometer site.
$ a2ensite ceilometer $ service apache2 reload
Limitation¶
As Ceilometer is using Pecan and Pecan’s DebugMiddleware doesn’t support
multiple processes, there is no way to set debug mode in the multiprocessing
case. To allow multiple processes the DebugMiddleware may be turned off by
setting pecan_debug
to False
in the api
section of
ceilometer.conf
.
For other WSGI setup you can refer to the pecan deployement documentation. .. pecan deployement: http://pecan.readthedocs.org/en/latest/deployment.html#deployment