[Spec] NFS related improvement for filesystem driver
Change-Id: Ic9b316a284641f4c5f33fe4238e08cf1d0faf2a1
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Abhishek Kekane
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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===========================================================
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Improve filesystem store driver to utilize NFS capabilities
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===========================================================
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https://blueprints.launchpad.net/glance/+spec/improve-filesystem-driver
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Problem description
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===================
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The filesystem backend of glance can be used to mount NFS share as local
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filesystem, so it does not required to store any special configs at
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glance side. Glance does not care about NFS server address or NFS share
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path at all, it just assumes that each image is stored in the local
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filesystem. The downside of this assumption is that glance does not
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aware whether NFS server is connected/available or not, NFS share
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is mounted or not and just keeps performing add/delete operations
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on local filesystem directory which later might causes problem
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in synchronization when NFS is back online.
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Proposed change
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===============
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Introduce few configuration options for filesystem driver which will help to
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detect if the NFS share is unmounted from underneath the Glance service. We
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proposed to introduce below new configuration options for the same:
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* 'filesystem_is_nfs_configured' - boolean, verify if NFS is configured or not
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* 'filesystem_nfs_host' - IP address of NFS server
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* 'filesystem_nfs_share_path' - Mount path of NFS mapped with local filesystem
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* 'filesystem_nfs_mount_options' - Mount options to be passed to NFS client
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* 'rootwrap_config' - To run commands as root user
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If 'filesystem_is_nfs_configured' is set, i.e. if NFS is configured then
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deployer must specify 'filesystem_nfs_host' and 'filesystem_nfs_share_path'
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config options in glance-api.conf otherwise the respective glance store will
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be disabled and will not be used for any operation.
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We are planning to use existing os-brick library (already used by cinder driver
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of glance_store) to create the NFS client with the help of above configuration
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options and check if NFS share is available or not during service
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initialization as well as before each image upload/import/delete operation. If
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NFS share is not available during service initialization then add and delete
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operations will be disabled but if NFS goes down afterwards we will raise
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HTTP 410 (HTTP GONE) response to the user.
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Glance still doesn't have capability to check whether particular NFS store has
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storage capability to store any particular image beforehand. Also it does not
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have capability to verify if network failure occurs during upload/import
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operation.
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Alternatives
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------------
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None
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Data model impact
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-----------------
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None
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REST API impact
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---------------
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We need to include these new configuration options in /v2/info/stores response.
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Security impact
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---------------
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None
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Notifications impact
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--------------------
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None
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Other end user impact
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---------------------
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None
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Performance Impact
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------------------
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Performance will have little impact since each add/delete operation now query
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NFS server to check whether it is reachable or not.
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Other deployer impact
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---------------------
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Deployer need to ensure that newly introduced configuration options are set
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in glance-api.conf file for filesystem store driver if NFS is used.
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Developer impact
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----------------
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None
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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abhishekk
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Other contributors:
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None
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Work Items
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----------
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* Introduce new configuration options
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* Use os-brick library to detect if the NFS share is available
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* Unit/Functional tests for coverage
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Dependencies
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============
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None
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Testing
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=======
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* Unit Tests
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* Functional Tests
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* Tempest Tests
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Documentation Impact
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====================
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Need to document new behavior of filesystem driver if NFS is configured
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References
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==========
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* PoC - https://review.opendev.org/c/openstack/glance_store/+/917283
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@ -6,7 +6,13 @@
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:glob:
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:maxdepth: 1
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TODO: fill this in once a new approved spec is added.
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2024.2 approved specs for glance:
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.. toctree::
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:glob:
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:maxdepth: 1
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glance_store/*
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