Alternate implementation of Bookie#getBookieAddress(ServerConfiguration conf) which is configurable to look at a specific interface.

gistfile1.java

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;

import org.apache.bookkeeper.conf.ServerConfiguration;

public class Bookie {

  public static InetSocketAddress getBookieAddress(ServerConfiguration conf) throws UnknownHostException, SocketException {

    String hostInterface = conf.getString("bookie.host.interface", "default");
    boolean useIpv6 = conf.getBoolean("bookie.host.useIpv6", false);
    
    InetAddress addr = getLocalInetAddrForInterface(hostInterface, useIpv6);
    return new InetSocketAddress(addr, conf.getBookiePort());
  }

  private static InetAddress getLocalInetAddrForInterface(String hostInterface, boolean useIpv6) throws UnknownHostException, SocketException {

    if (hostInterface.equals("default")) {
      return InetAddress.getLocalHost();
    }

    NetworkInterface netInt = NetworkInterface.getByName(hostInterface);
    for (InterfaceAddress addr : netInt.getInterfaceAddresses()) {
      // The List<InterfaceAddresses> includes the ipv4 and ipv6 (if available) addresses associated with the interface
      // ipv6 does not have a broadcast, so getBroadcast returns null.  Use this to return the right InetAddress based on the value of useIpv6
      if ((addr.getBroadcast() == null && useIpv6) || (addr.getBroadcast() != null && !useIpv6)) {
        return addr.getAddress();
      }
    }
    
    throw new UnknownHostException("Did not find a reasonable InetAddress for hostInterface=" + hostInterface + ", useIpv6=" + useIpv6);
  }


  public static void main(String[] args) throws UnknownHostException, SocketException {
    ServerConfiguration conf = new ServerConfiguration();
    System.out.println(Bookie.getBookieAddress(conf));
  }

}