Correct, you do not set VLAN on DHCP, you do it the other way around, you define DHCP scope for VLAN.
So, in IPT environment you define data vlan and voice vlans on the switchports, then based on the vlan the device connected to the switchport determines which one to use, in IP phone case it picks up voice vlan via CDP protocol, and then of there is a dhcp scope defined for that VLAN on your L3 device, either router or L3 switch it obtains the IP address from the dhcp provider. For the phones to get the IP address of the TFTP server you need to include option 150 pointing to the CM TFTP server on the DHCP scope.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.