egressip: startEgressIPHealthCheckingServer must wait for ipv6 to settle

Signed-off-by: Flavio Fernandes <flaviof@redhat.com>

go-controller/pkg/node/node.go

@@ -20,6 +20,7 @@ import (
 	"k8s.io/klog/v2"
 	utilnet "k8s.io/utils/net"
 
+	"github.com/containernetworking/plugins/pkg/ip"
 	honode "github.com/ovn-org/ovn-kubernetes/go-controller/hybrid-overlay/pkg/controller"
 	"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/cni"
 	"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/config"
@@ -593,6 +594,11 @@ func (n *OvnNode) startEgressIPHealthCheckingServer(wg *sync.WaitGroup, mgmtPort
 		nodeMgmtIP = mgmtPortConfig.ipv4.ifAddr.IP
 	} else if mgmtPortConfig.ipv6 != nil {
 		nodeMgmtIP = mgmtPortConfig.ipv6.ifAddr.IP
+		// Wait for address to become usable. This is needed so server is safe to bind using this
+		// address. This is only needed for IPv6.
+		if err := ip.SettleAddresses(mgmtPortConfig.ifName, 10); err != nil {
+			return fmt.Errorf("failed start health checking server due to unsettled IPv6: %w", err)
+		}
 	} else {
 		return fmt.Errorf("unable to start health checking server: no mgmt ip")
 	}