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Taketani Ryo f0730df40c Update the installation guide for RHEL8/CentOS8

The openstack Ussuri and Victoria versions no longer support the
RHEL7/CentOS7 and python2 environment packages. Correct the
problems in the latest installation document for RDO.

Change-Id: Ie03815f25d3a9ec99506a9dc14810a6800d3c42c

2022-10-28 09:22:07 +09:00

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Install and configure for Red Hat Enterprise Linux and CentOS

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 install using pip:
```
# dnf install openstack-gnocchi-api openstack-gnocchi-metricd \
  python3-gnocchiclient
```
Note

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:
```
# dnf install uwsgi-plugin-common uwsgi-plugin-python3 uwsgi
```
Note

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

Start the Gnocchi services and configure them to start when the system boots:

# systemctl enable openstack-gnocchi-api.service \
  openstack-gnocchi-metricd.service
# systemctl start openstack-gnocchi-api.service \
  openstack-gnocchi-metricd.service

Install and configure components

Install the Ceilometer packages:

# dnf install openstack-ceilometer-notification \
  openstack-ceilometer-central

Finalize installation

Start the Telemetry services and configure them to start when the system boots:

# systemctl enable openstack-ceilometer-notification.service \
  openstack-ceilometer-central.service
# systemctl start openstack-ceilometer-notification.service \
  openstack-ceilometer-central.service

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