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how to persist network configuration after devstack installation ?

Hi all,

We are facing a stupid problem after devstack installation. Everything's ok (can access instances, instances can joint the public network, ...) but when we reboot the host machine, network configuration done during the installation is lost; whereas in the same time, all openstack services are correctly turned off and started when the host is up.

Our installation is on Ubuntu 18.04LTS + latest devstack with Horizon and Murano. We know that it is not for production, but we would like to demonstrate what could be done with OpenStack when we do not have internet connection (and no time to reinstall it).

So someone know how to persist this network configuration ?

thx a lot for your help