Configuring Cinder with a Custom Unmanaged Backend

This guide assumes that your undercloud is already installed and ready to deploy an overcloud.

Adding a custom backend to Cinder

It is possible to provide the config settings to add an arbitrary and unmanaged backend to Cinder at deployment time via Heat environment files.

Each backend is represented in cinder.conf with a stanza and a reference to it from the enabled_backends key. The keys valid in the backend stanza are dependent on the actual backend driver and unknown to Cinder.

For example, to provision in Cinder two additional backends one could create a Heat environment file with the following contents:

parameter_defaults:
  ExtraConfig:
    cinder::config::cinder_config:
        netapp1/volume_driver:
                value: cinder.volume.drivers.netapp.common.NetAppDriver
        netapp1/netapp_storage_family:
                value: ontap_7mode
        netapp1/netapp_storage_protocol:
                value: iscsi
        netapp1/netapp_server_hostname:
                value: 1.1.1.1
        netapp1/netapp_server_port:
                value: 80
        netapp1/netapp_login:
                value: root
        netapp1/netapp_password:
                value: 123456
        netapp1/volume_backend_name:
                value: netapp_1
        netapp2/volume_driver:
                value: cinder.volume.drivers.netapp.common.NetAppDriver
        netapp2/netapp_storage_family:
                value: ontap_7mode
        netapp2/netapp_storage_protocol:
                value: iscsi
        netapp2/netapp_server_hostname:
                value: 2.2.2.2
        netapp2/netapp_server_port:
                value: 80
        netapp2/netapp_login:
                value: root
        netapp2/netapp_password:
                value: 123456
        netapp2/volume_backend_name:
                value: netapp_2
    cinder_user_enabled_backends: ['netapp1','netapp2']

This will not interfere with the deployment of the other backends managed by TripleO, like Ceph or NFS and will just add these two to the list of the backends enabled in Cinder.

Remember to add such an environment file to the deploy commandline:

openstack overcloud deploy [other overcloud deploy options] -e ~/my-backends.yaml

Note

The Node customization and Third-Party Integration doc has more details on the usage of the different ExtraConfig interfaces.

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