support vip / floating ip

[cloudfoundry-community]

support vip / floating ip

[poblin-orange]

In advanced networking, some pre-reserved ips can be pre allocated on an external network, and mapped with SNAT to the vm analogous to openstack floating ip mapping to an instance)
Supporting these snat ip mapping might imply to open tcp port mapping with cloudstack firewall api

[poblin-orange]

jclouds seem to provide necessery apis, eg :

            ListPublicIPAddressesOptions listPublicIpOptions=ListPublicIPAddressesOptions.Builder.IPAddress(directorNetwork.ip);
            //check vip exists
            String IPAddressId=api.getAddressApi().listPublicIPAddresses(listPublicIpOptions).iterator().next().getId(); //TODO: find public ip id ?.

            //check vip is avail? (or force)

            //assign vip to vm
            logger.info("enable static nat for vip {} to vm {}",directorNetwork.ip,vmName);
            String virtualMachineId="XXXXX"; //FIXME: must be retrieved from previously created vm
            api.getNATApi().enableStaticNATForVirtualMachine(virtualMachineId, IPAddressId);


            //create nat forwarding rules
            logger.info("adding nat forwarding rules for vip {} to vm {}",directorNetwork.ip,vmName);
            int startPort=1;
            CreateIPForwardingRuleOptions natOptions=CreateIPForwardingRuleOptions.Builder.endPort(65535);//check

            AsyncCreateResponse resp;
            resp=api.getNATApi().createIPForwardingRule(IPAddressId, "TCP", startPort, natOptions);
            jobComplete.apply(resp.getJobId());

            resp=api.getNATApi().createIPForwardingRule(IPAddressId, "UDP", startPort, natOptions);
            jobComplete.apply(resp.getJobId());         

[poblin-orange]

2 ways of implementing the vip

• a: apply static NAT from public address to the vm
• b : declare forwarding rule, specifying protocol (tcp/udp) and related ports interval

The 2 options are exclusive from cloudstack point of view
option a has been easily implemented, as it requires no specific cloud-properties (the network type 'vip' is enough to set up the static nat.

option b would require to be able to specify the protocol / interval set. Probably with vm level cloud_properties.