glance-irods: iRODS Storage Back-end for OpenStack Glance

NOTICE: This repo is no longer maintained (transitioned to using Ceph RBD for Glance images). the iRODS backend most recently worked for OpenStack Newton.

Dependencies

• Python-irodsclient
• OpenStack Glance

Manual Installation

This procedure is intended for OpenStack Newton release; procedure may differ for other versions of OpenStack.

These steps assume you are installing glance-irods on an OpenStack Glance server (or LXC as would be set up by OpenStack-Ansible).

There's certainly a better way to package this (e.g. as a fork of glance_store), but this will get you going for now.

Install python-irodsclient

Activate your Glance's virtual environment and:

pip install git+git://github.com/irods/python-irodsclient.git

If you're working with an OpenStack deployed by OpenStack-Ansible, then try installing with the --isolated switch.

Configure Glance

Add or change the following configuration to the appropriate sections of your glance-api.conf; this file is stored in /etc/glance/glance-api.conf for glance-api as packaged by OpenStack-Ansible and Ubuntu Cloud Archive.

[default]
# Replace the following with connection details for your own iRODS deployment
irods_store_host = exampleirodshost.org
irods_store_port = 1247
irods_store_zone = tempZone
irods_store_path = /tempZone/home/openstack_images
irods_store_user = openstack_images
irods_store_password = somepassword

[glance_store]
stores = file, irods  # You may have a comma-separated list of multiple back-ends
default_store = irods

Patch glance_store

The glance_store source code needs some tweaks to support the new iRODS storage backend.

First, find the library path for your glance_store Python package. In an LXC deployed via OpenStack-Ansible, this may be something like /openstack/venvs/glance-14.0.4/lib/python2.7/site-packages/glance_store.

Add irods to the choices tuple in the following block of backend.py in that folder:

    cfg.StrOpt('default_store',
               default='file',
               choices=('file', 'filesystem', 'http', 'https', 'swift',
                        'swift+http', 'swift+https', 'swift+config', 'rbd',
                        'sheepdog', 'cinder', 'vsphere', 'irods'),

See example backend.py in this repo.

Copy irods_store.py to the _drivers subfolder of glance_store.

Next to the my-venv/lib/python2.7/site-packages/glance_store folder, you should see a dist-info folder, e.g. /openstack/venvs/glance-14.0.4/lib/python2.7/site-packages/glance_store-0.18.0.dist-info. Find entry_points.txt in this folder and add the following text to the [glance_store.drivers] section:

[glance_store.drivers]
...
glance.store.irods.Store = glance_store._drivers.irods_store:Store
irods = glance_store._drivers.irods_store:Store

See example entry_points.txt in this repo.

Restart glance-api

systemctl restart glance-api

Questions?

Feel free to contact the developers:

• Edwin Skidmore ([email protected])
• Amit Juneja ([email protected])
• Chris Martin ([email protected])

License

It's a standard BSD License. See LICENSE.txt