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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 create a database, service credentials, and API endpoints. However, unlike other services, the Telemetry service uses a NoSQL database. See environment-nosql-database-rdo to install and configure MongoDB before proceeding further.

Create the ceilometer database:

# mongo --host controller --eval '
  db = db.getSiblingDB("ceilometer");
  db.createUser({user: "ceilometer",
  pwd: "CEILOMETER_DBPASS",
  roles: [ "readWrite", "dbAdmin" ]})'

  MongoDB shell version: 2.6.x
  connecting to: controller:27017/test
  Successfully added user: { "user" : "ceilometer", "roles" : [ "readWrite", "dbAdmin" ] }

Replace CEILOMETER_DBPASS with a suitable password.

Install and configure components

Install the packages:

# yum install openstack-ceilometer-api \
  openstack-ceilometer-collector openstack-ceilometer-notification \
  openstack-ceilometer-central python-ceilometerclient

Configure the Apache HTTP server

Create the /etc/httpd/conf.d/wsgi-ceilometer.conf file with the following content:

Listen 8777

<VirtualHost *:8777>
    WSGIDaemonProcess ceilometer-api processes=2 threads=10 user=ceilometer group=ceilometer display-name=%{GROUP}
    WSGIProcessGroup ceilometer-api
    WSGIScriptAlias / "/var/www/cgi-bin/ceilometer/app"
    WSGIApplicationGroup %{GLOBAL}
    ErrorLog /var/log/httpd/ceilometer_error.log
    CustomLog /var/log/httpd/ceilometer_access.log combined
</VirtualHost>

WSGISocketPrefix /var/run/httpd

Finalize installation

Reload the Apache HTTP server:
```
# systemctl reload httpd.service
```

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

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

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