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Language:
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3.14. Conductor
The
nova-conductor
service enables OpenStack to function without compute nodes accessing the database. Conceptually, it implements a new layer on top of nova-compute
. It should not be deployed on compute nodes, or else the security benefits of removing database access from nova-compute
are negated. Just like other nova services such as nova-api
or nova-scheduler, it can be scaled horizontally. You can run multiple instances of nova-conductor
on different machines as needed for scaling purposes.
The methods exposed by
nova-conductor
are relatively simple methods used by nova-compute
to offload its database operations. Places where nova-compute
previously performed database access are now talking to nova-conductor
. However, there are plans in the medium to long term to move more and more of what is currently in nova-compute
up to the nova-conductor
layer. The Compute service will start to look like a less intelligent slave service to nova-conductor
. The conductor service will implement long running complex operations, ensuring forward progress and graceful error handling. This will be especially beneficial for operations that cross multiple compute nodes, such as migrations or resizes.
To customize the Conductor, use the configuration option settings documented in Table 3.20, “Description of conductor configuration options”.