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6.7. Configuring NFS Storage

This section describes configuring the Overcloud to use an NFS share. The installation and configuration process is based on the modification of an existing environment file in the core Heat template collection.
The core heat template collection contains a set of environment files in /usr/share/openstack-tripleo-heat-templates/environments/. These environment templates help with custom configuration of some of the supported features in a director-created Overcloud. This includes an environment file to help configure storage. This file is located at /usr/share/openstack-tripleo-heat-templates/environments/storage-environment.yaml. Copy this file to the stack user's template directory. 
$ cp /usr/share/openstack-tripleo-heat-templates/environments/storage-environment.yaml ~/templates/.
The environment file contains some parameters to help configure different storage options for Openstack's block and image storage components, cinder and glance. In this example, you will configure the Overcloud to use an NFS share. Modify the following parameters:
CinderEnableIscsiBackend
Enables the iSCSI backend. Set to false.
CinderEnableRbdBackend
Enables the Ceph Storage backend. Set to false.
CinderEnableNfsBackend
Enables the NFS backend. Set to true.
NovaEnableRbdBackend
Enables Ceph Storage for Nova ephemeral storage. Set to false.
GlanceBackend
Define the back end to use for Glance. Set to file to use file-based storage for images. The Overcloud will save these files in a mounted NFS share for Glance.
CinderNfsMountOptions
The NFS mount options for the volume storage.
CinderNfsServers
The NFS share to mount for volume storage. For example, 192.168.122.1:/export/cinder.
GlanceFilePcmkManage
Enables Pacemaker to manage the share for image storage. If disabled, the Overcloud stores images in the Controller node's file system. Set to true.
GlanceFilePcmkFstype
Defines the file system type that Pacemaker uses for image storage. Set to nfs.
GlanceFilePcmkDevice
The NFS share to mount for image storage. For example, 192.168.122.1:/export/glance.
GlanceFilePcmkOptions
The NFS mount options for the image storage.
The environment file's options should look similar to the following: 
parameter_defaults:
CinderEnableIscsiBackend: false
CinderEnableRbdBackend: false
CinderEnableNfsBackend: true
NovaEnableRbdBackend: false
GlanceBackend: 'file'

CinderNfsMountOptions: 'rw,sync'
CinderNfsServers: '192.0.2.230:/cinder'

GlanceFilePcmkManage: true
GlanceFilePcmkFstype: 'nfs'
GlanceFilePcmkDevice: '192.0.2.230:/glance'
GlanceFilePcmkOptions: 'rw,sync,context=system_u:object_r:glance_var_lib_t:s0'

Important

Include the context=system_u:object_r:glance_var_lib_t:s0 in the GlanceFilePcmkOptions parameter to allow glance access to the /var/lib directory. Without this SELinux content, glance will fail to write to the mount point.
These parameters are integrated as part of the heat template collection. Setting them as such creates two NFS mount points for cinder and glance to use.
Save this file for inclusion in the Overcloud creation.