Installation

Installation

Gnocchi can be installed using pip. Depending on the drivers and features you want to use (see Project Architecture for which driver to pick), you need to specify the extra variants you need. For example:

pip install gnocchi[postgresql,ceph,keystone]

This would install PostgreSQL support for the indexer, Ceph support for storage, and Keystone support for authentication and authorization.

The list of variants available is:

  • keystone – provides Keystone authentication support
  • mysql - provides MySQL indexer support
  • postgresql – provides PostgreSQL indexer support
  • swift – provides OpenStack Swift storage support
  • s3 – provides Amazon S3 storage support
  • ceph_recommended_lib – provides Ceph (>=0.80) storage support
  • ceph_alternative_lib – provides Ceph (>=12.2.0) storage support
  • redis – provides Redis storage support
  • doc – documentation building support
  • test – unit and functional tests support

To install Gnocchi from source, run the standard Python installation procedure:

pip install -e .

Again, depending on the drivers and features you want to use, you need to install extra variants using, for example:

pip install -e .[postgresql,ceph,ceph_recommended_lib]

Ceph requirements

The ceph driver needs to have a Ceph user and a pool already created. They can be created for example with:

ceph osd pool create metrics 8 8
ceph auth get-or-create client.gnocchi mon "allow r" osd "allow rwx pool=metrics"

Gnocchi leverages some librados features (omap, async, operation context) available in python binding only since python-rados >= 12.2.0. To handle this, Gnocchi uses ‘cradox’ python library which has exactly the same API but works with Ceph >= 0.80.0.

If Ceph and python-rados are >= 12.2.0, cradox python library becomes optional but is still recommended.

Configuration

Configuration file

By default, gnocchi looks for its configuration file in the following places, in order:

  • ~/.gnocchi/gnocchi.conf
  • ~/gnocchi.conf
  • /etc/gnocchi/gnocchi.conf
  • /etc/gnocchi.conf
  • ~/gnocchi/gnocchi.conf.d
  • ~/gnocchi.conf.d
  • /etc/gnocchi/gnocchi.conf.d
  • /etc/gnocchi.conf.d

No config file is provided with the source code; it will be created during the installation. In case where no configuration file was installed, one can be easily created by running:

gnocchi-config-generator > /path/to/gnocchi.conf

Configure Gnocchi by editing the appropriate file.

The configuration file should be pretty explicit, but here are some of the base options you want to change and configure:

Option name Help
storage.driver The storage driver for metrics.
indexer.url URL to your indexer.
storage.file_* Configuration options to store files if you use the file storage driver.
storage.swift_* Configuration options to access Swift if you use the Swift storage driver.
storage.ceph_* Configuration options to access Ceph if you use the Ceph storage driver.
storage.s3_* Configuration options to access S3 if you use the S3 storage driver.
storage.redis_* Configuration options to access Redis if you use the Redis storage driver.

The same options are also available as incoming.<drivername>_* for configuring the incoming storage. If no incoming storage is set, the default is to use the configured storage driver.

Configuring authentication

The API server supports different authentication methods: basic (the default) which uses the standard HTTP Authorization header or keystone to use OpenStack Keystone. If you successfully installed the keystone flavor using pip (see Installation), you can set api.auth_mode to keystone to enable Keystone authentication.

Initialization

Once you have configured Gnocchi properly you need to initialize the indexer and storage:

gnocchi-upgrade

Upgrading

In order to upgrade from a previous version of Gnocchi, you need to make sure that your indexer and storage are properly upgraded.

Warning

Upgrade is only supported between one major version to another or between minor versions, e.g.:

  • version 2.0 to version 2.1 or 2.2 is supported
  • version 2.1 to version 3.0 is supported
  • version 2 to version 4 is not supported.

Run the following:

  1. Stop the old version of Gnocchi API server and gnocchi-statsd daemon
  2. Stop the old version of gnocchi-metricd daemon

Warning

Data in backlog is never migrated between versions. Ensure the backlog is empty before any upgrade to ensure data is not lost.

  1. Install the new version of Gnocchi

  2. Run gnocchi-upgrade.

    This will take from a few minutes to several hours depending on the size of your index and storage.

  3. Start the new Gnocchi API server, gnocchi-metricd and gnocchi-statsd daemons

Installation using Docker

The gnocchi-docker repository contains the needed Dockerfile and script to build a Docker image containing Gnocchi latest version (fetched from PyPI). It also provides an example of docker-compose file in order to run a full deployment on Gnocchi (indexer and storage included).

Installation using OpenShift

The gnocchi-openshift repository contains the needed Dockerfile and script to build a Docker image containing Gnocchi latest version (fetched from PyPI).

Installation Using Devstack

To enable Gnocchi in devstack, add the following to local.conf:

enable_plugin gnocchi https://github.com/gnocchixyz/gnocchi master

To enable Grafana support in devstack, you can also enable gnocchi-grafana:

enable_service gnocchi-grafana

Then, you can start devstack:

./stack.sh