100 lines
3.8 KiB
Markdown
100 lines
3.8 KiB
Markdown
# Overview
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This charm provides the Ceilometer service for OpenStack.
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Ceilometer is made up of 2 separate services: an API service, and a collector
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service. This charm allows them to be deployed in different combination,
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depending on user preference and requirements.
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## Usage
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In order to deploy Ceilometer service (prior to Queens), the MongoDB
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service is required:
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juju deploy mongodb
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juju deploy ceilometer
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juju add-relation ceilometer mongodb
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For OpenStack Queens or later, Gnocchi should be used instead of MongoDB
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for resource, metrics and measure storage:
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juju add-relation ceilometer gnocchi
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Note: When ceilometer is related to gnocchi the ceilometer-upgrade action
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must be run post deployment in order to update its data store in gnocchi.
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juju run-action ceilometer-upgrade
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then Keystone and Rabbit relationships need to be established:
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juju add-relation ceilometer:amqp rabbitmq
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juju add-relation ceilometer keystone:identity-service
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juju add-relation ceilometer keystone:identity-notifications
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For OpenStack Queens, the identity-service relation must be replaced
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with the identity-credentials relation:
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juju add-relation ceilometer keystone:identity-credentials
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Ceilometer@Queens does not provide an API service.
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In order to capture the calculations, a Ceilometer compute agent needs to be
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installed in each nova node, and be related with Ceilometer service:
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juju deploy ceilometer-agent
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juju add-relation ceilometer-agent nova-compute
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juju add-relation ceilometer-agent:amqp rabbitmq-server:amqp
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juju add-relation ceilometer:ceilometer-service ceilometer-agent:ceilometer-service
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Ceilometer provides an API service that can be used to retrieve
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Openstack metrics.
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If ceilometer needs to listen to multiple message queues then use the amqp interface
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to relate ceilometer to the message broker that it should publish to and use the
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amqp-listener interface for all message brokers ceilometer should monitor.
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juju add-relation ceilometer:amqp rabbitmq-central
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juju add-relation ceilometer:amqp-listener rabbitmq-neutron
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juju add-relation ceilometer:amqp-listener rabbitmq-nova-cell2
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## High availability
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When more than one unit is deployed with the [hacluster][hacluster-charm]
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application the charm will bring up an HA active/active cluster.
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There are two mutually exclusive high availability options: using virtual IP(s)
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or DNS. In both cases the hacluster subordinate charm is used to provide the
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Corosync and Pacemaker backend HA functionality.
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See [OpenStack high availability][cdg-ha-apps] in the [OpenStack Charms
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Deployment Guide][cdg] for details.
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## Network Space support
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This charm supports the use of Juju Network Spaces, allowing the charm to be bound to network space configurations managed directly by Juju. This is only supported with Juju 2.0 and above.
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API endpoints can be bound to distinct network spaces supporting the network separation of public, internal and admin endpoints.
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To use this feature, use the --bind option when deploying the charm:
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juju deploy ceilometer --bind "public=public-space internal=internal-space admin=admin-space"
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alternatively these can also be provided as part of a juju native bundle configuration:
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ceilometer:
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charm: cs:ceilometer
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bindings:
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public: public-space
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admin: admin-space
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internal: internal-space
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NOTE: Spaces must be configured in the underlying provider prior to attempting to use them.
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NOTE: Existing deployments using os-*-network configuration options will continue to function; these options are preferred over any network space binding provided if set.
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<!-- LINKS -->
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[hacluster-charm]: https://jaas.ai/hacluster
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[cdg]: https://docs.openstack.org/project-deploy-guide/charm-deployment-guide
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[cdg-ha-apps]: https://docs.openstack.org/project-deploy-guide/charm-deployment-guide/latest/app-ha.html#ha-applications
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