Feature Overview (aka. Goal Summary)  

Provide a way to configure an /etct/hosts files on the host that is used by CoreDNS for name resolution, so that names in that hosts file are resolved from within a pod running on MicroShift

Goals (aka. expected user outcomes)

The goal is to simplify DNS resolution. In edge deployments, access to DNS configuration is sometimes complicated. A quick and easy way would be an /etc/hosts files with addition entries. CoreDNS (used by MicroShift internally) has a "hosts plugin" which can respect/use such a hosts files. 

Requirements (aka. Acceptance Criteria):

1. Provide an optional config option in the MicroShift config file to point to a /etc/hosts file
2. If the config option is set, configure CoreDNS to utilize that hosts file using the hosts plugin.
3. A name in the hosts file must be resolved from within any pod, without any further configuration needed to the pod. 
4. Changes to the hosts file must be reflected immediately without any restarts

Questions to Answer (Optional):

1.  do we need help/guidance from the networking team with the CoreDNS config part?

Out of Scope

n/a

Background

n/a

Customer Considerations

This is based on customer request - see linked RFE

Documentation Considerations

Needs documented in the networking secition

Interoperability Considerations

none expected - maybe networking due to coreDNS config