To install Gnocchi using pip, just type:
pip install gnocchi
Depending on the drivers and features you want to use (see Project Architecture for which driver to pick), you need to install extra variants using, 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 – provides common part of Ceph storage support
- ceph_recommended_lib – provides Ceph (>=0.80) storage support
- ceph_alternative_lib – provides Ceph (>=12.2.0) storage support
- file – provides file driver 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]
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.
By default, gnocchi looks for its configuration file in the following places, in order:
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:
|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.
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.
Once you have configured Gnocchi properly you need to initialize the indexer and storage:
In order to upgrade from a previous version of Gnocchi, you need to make sure that your indexer and storage are properly upgraded.
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:
- Stop the old version of Gnocchi API server and gnocchi-statsd daemon
- Stop the old version of gnocchi-metricd daemon
Data in backlog is never migrated between versions. Ensure the backlog is empty before any upgrade to ensure data is not lost.
Install the new version of Gnocchi
This will take from a few minutes to several hours depending on the size of your index and storage.
Start the new Gnocchi API server, gnocchi-metricd and gnocchi-statsd daemons
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:
Then, you can start devstack: