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Gnocchi API coundn't be use if we don't install and configure uwsgi or other HTTP daemon. And gnocchi install guide didn't describe those. Add the describe of installing uWSGI and the brief relationship between uWSGI and Gnocchi API. And tell the reader that they can also use Apache httpd and mod_wsgi, or any other HTTP daemon to run Gnocchi API. Closes-Bug: #1750933 Change-Id: Iba8c1fe7a64569de4ca366251c495731a8d7a779
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Install and configure for Ubuntu
This section describes how to install and configure the Telemetry service, code-named ceilometer, on the controller node.
Prerequisites
Before you install and configure the Telemetry service, you must configure a target to send metering data to. The recommended endpoint is Gnocchi.
Install Gnocchi
Install the Gnocchi packages. Alternatively, Gnocchi can be installed using pip:
# apt-get install gnocchi-api gnocchi-metricd python-gnocchiclientNote
Depending on your environment size, consider installing Gnocchi separately as it makes extensive use of the cpu.
Install the uWSGI packages. The following method uses operating system provided packages. Another alternative would be to use pip(or pip3, depending on the distribution); using pip is not described in this doc:
# apt-get install uwsgi-plugin-python3 uwsgiNote
Since the provided gnocchi-api wraps around uwsgi, you need to make sure that uWSGI is installed if you want to use gnocchi-api to run Gnocchi API. As Gnocchi API tier runs using WSGI, it can also alternatively be run using Apache httpd and mod_wsgi, or any other HTTP daemon.
Finalize Gnocchi installation
Restart the Gnocchi services:
# service gnocchi-api restart # service gnocchi-metricd restart
Install and configure components
Install the ceilometer packages:
# apt-get install ceilometer-agent-notification \ ceilometer-agent-central
Finalize installation
Restart the Telemetry services:
# service ceilometer-agent-central restart # service ceilometer-agent-notification restart