Configuration changed before running install image is not carried over into the installation. On Vyos 1.1.8 you are asked which config to copy to the new installation, but on 1.2.0rc8 only the config.boot.default is available.
vyos@vyos:~$ configure  vyos@vyos# set interfaces ethernet eth0 address dhcp  vyos@vyos# commit  vyos@vyos# save Saving configuration to '/config/config.boot'... Done  vyos@vyos# exit exit vyos@vyos:~$ install image Welcome to the VyOS install program. This script <...> I found the following configuration files: /opt/vyatta/etc/config.boot.default Which one should I copy to sda? [/opt/vyatta/etc/config.boot.default]:
Here I would like to select my updated configuration.