Use an external Swift Proxy with the Overcloud

TripleO supports use of an external Swift proxy already available to the operator, that may need to configure at deploy time.

This happens by enabling a particular environment file when deploying the Overcloud, specifically environments/swift-external.yaml.

In the environment file above user must adjust the parameters to fit its setup by creating a custom environment file (i.e. ~/my-swift-settings.yaml):

parameter_defaults:
   ExternalPublicUrl: 'http://swiftproxy:9024/v1/%(tenant_id)s'
   ExternalInternalUrl: 'http://swiftproxy:9024/v1/%(tenant_id)s'
   ExternalAdminUrl: 'http://swiftproxy:9024/v1/%(tenant_id)s'
   ExternalSwiftUserTenant: 'service'

The user can create an environment file with the required settings and add the files above to the deploy commandline:

openstack overcloud deploy --templates -e /usr/share/openstack-tripleo-heat-templates/environments/swift-external.yaml -e ~/my-swift-settings.yaml

Once the deploy has succeeded, user has to complete the configuration on the external swift proxy, configuring it to use the keystone authentication provider. This environment files creates also a service user called swift that can be used for this purpose.