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/etc/hosts is not maintained by OpenStack. If you want to keep track of hosts through /etc/hosts, you will need to use a system outside of OpenStack. Configuration Management Systems such as Puppet or Chef are able to do this. You can also maintain your suite of hosts files by hand, but that might become unmanageable quickly.

Depending on what the unresolvable hostnames are, you can also add them to your DNS server(s) if they're available.