Comment 2 for bug 1634171

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Steven Hardy (shardy) wrote : Re: [RFE] OVN change ovn_db_host to default to controller(s)

So it looks like this parameter is a poor fit for composable services as it's effectively used as a conditional, not a way to connect to another service:

https://github.com/openstack/puppet-tripleo/blob/master/manifests/profile/base/neutron/plugins/ml2/ovn.pp#L32

As commented in the manifest, we should probably split the northd stuff into a separate composable manifest, then you just include it on whichever role you wish, and the connection details will be automatically made available via hiera, e.g ovn_northd_node_ips (assuming the new composable service template has a service_name of ovn_northd)