How to configure undercoud services and make changes persist during an OpenStack undercloud upgrade

Environment

• Red Hat OpenStack Platform 10

Issue

• How do I configure undercloud services and make changes persist during an OpenStack undercloud upgrade?
• How do you customize undercloud hiera?

Resolution

Use hieradata_override in /home/stack/undercloud.conf

[stack@undercloud-1 ~]$ grep hieradata_override undercloud.conf  -B5

# Path to hieradata override file. If set, the file will be copied
# under /etc/puppet/hieradata and set as the first file in the hiera
# hierarchy. This can be used to to custom configure services beyond
# what undercloud.conf provides (string value)
#hieradata_override =

Create hiera override file with hiera settings that should be persistent:

nova::network::neutron::dhcp_domain: redhat.com
neutron::dns_domain: redhat.local

Configure the hieradata_override parameter in undercloud.conf.

crudini --set /home/stack/undercloud.conf DEFAULT hieradata_override /home/stack/custom_hiera.yaml

For a working example, refer to https://access.redhat.com/solutions/2089051

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