when using dmlc_ssh.py to start a cluster ,it can't using netinterface ib0

when I start a cluster by dmlc_ssh.py,I find it not use ib0.
In my hosts :
10.10.10.4 Server_10_10_10_4
10.10.101.4 Server_10_10_10_4_IB
eth0 ip is 10.10.10.4,ib0 ip is 10.10.101.4
In https://github.com/dmlc/ps-lite/blob/master/tracker/tracker.py line 391: hostIP = socket.gethostbyname(socket.getfqdn()) or hostIP = socket.gethostbyname(socket.gethostname())
not using DMLC_INTERFACE = ib0,so it get ip 10.10.10.4.
This lead scheduler not using ib0,and all roles using eth0.