Issue the following command on the controller node to install the VPN agent and its dependencies, including the strongSwan VPN software package:
# apt-get install neutron-vpn-agent
During the installation, you may notice the following message:
The following packages will be REMOVED: neutron-l3-agent
neutron-vpn-agent service replaces
neutron-l3-agent but inherits all of its functionality and configuration.
The agents are mutually exclusive and should not be installed simultaneously. Failure to heed this warning will result in unexpected issues.