EduFrazao commented on issue #13519:
URL: https://github.com/apache/cloudstack/issues/13519#issuecomment-4849911938
In order to investigate a little deeper, I've made some changes on
ServerResourceBase and LibvirtComputingResource
Insted of try to guess the private management ip address from listing all
interfaces and getting the first with a IP (in case of the
private.network.device does not have an IP directly associated), I've added a
little snippet where I try to use the hypervisor OS routing table to resolve
what is the best source ip address (the source address used to reach the
management server).
```
protected void
tryToAutoDiscoverResourcePrivateNetworkInterfaceByRouteLookup(Map<String,
Object> params) throws ConfigurationException {
logger.info("Trying to autodiscover this resource's private network
interface by route lookup");
final String mgmtIp = collectMgmtHostIp(params);
if (mgmtIp == null) {
logger.info("Unable to resolve any management server ip address.
Aborting private network search by route lookup.");
return;
}
logger.info(String.format("Using management server IP [%s] to
lookup", mgmtIp));
try {
InetAddress address = InetAddress.getByName(mgmtIp);
try (DatagramSocket socket = new DatagramSocket()) {
socket.connect(address, 8250); // Port is not really
important, can be hardcoded
// Asking for source address to mgmgt destination to O.S
routing tables.
InetAddress localAddress = socket.getLocalAddress();
// Collecting interface with this source address
NetworkInterface nic =
NetworkInterface.getByInetAddress(localAddress);
if (nic != null) {
logger.info(String.format("Using NIC [%s] as private
NIC.", nic));
privateNic = nic;
}
}
} catch (Exception e) {
// Logging only, if this method was unnable to find a valid
interface, iteration will be tested
logger.debug(String.format("Unable to use routing table to
determine private management interface: [%s]", e.getMessage()));
}
}
````
```
2026-07-01 00:08:19,302 INFO [kvm.resource.LibvirtComputingResource]
(main:[]) (logid:) Trying to autodiscover this resource's private network
interface by route lookup
2026-07-01 00:08:19,303 INFO [kvm.resource.LibvirtComputingResource]
(main:[]) (logid:) Params: [{host=10.254.0.101,10.254.0.100@roundrobin}]
2026-07-01 00:08:19,303 INFO [kvm.resource.LibvirtComputingResource]
(main:[]) (logid:) Parsing host setting: [10.254.0.101,10.254.0.100@roundrobin]
2026-07-01 00:08:19,303 INFO [kvm.resource.LibvirtComputingResource]
(main:[]) (logid:) Using management server IP [10.254.0.101] to lookup
2026-07-01 00:08:19,307 INFO [kvm.resource.LibvirtComputingResource]
(main:[]) (logid:) Using NIC [name:v-clmgmt (v-clmgmt)] as private NIC.
```
And now its working.
If this method does not find any interfaces, the previous method continues
to work.
Do you guys thinks that this is acceptable?
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