Comment 1 for bug 1800123

To recover I have to reboot the node:-

root@5c3s1-node4:~# reboot
root@5c3s1-node4:~# Connection to 10.87.74.132 closed by remote host.
Connection to 10.87.74.132 closed.
[ritam@nodem3 ~]$ ssh root@10.87.74.132
root@10.87.74.132's password:
Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.4.0-87-generic x86_64)

 * Documentation: https://help.ubuntu.com
 * Management: https://landscape.canonical.com
 * Support: https://ubuntu.com/advantage
Last login: Fri Oct 26 02:59:44 2018 from 10.204.216.92
root@5c3s1-node4:~# systemctl status networking.service
* networking.service - Raise network interfaces
   Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)
  Drop-In: /run/systemd/generator/networking.service.d
           `-50-insserv.conf-$network.conf
   Active: active (exited) since Fri 2018-10-26 03:16:23 PDT; 2min 22s ago
     Docs: man:interfaces(5)
  Process: 1036 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=0/SUCCESS)
  Process: 985 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] && udevadm settle (code=exited, status=0/SUCCESS)
 Main PID: 1036 (code=exited, status=0/SUCCESS)
    Tasks: 0
   Memory: 0B
      CPU: 0
   CGroup: /system.slice/networking.service

Oct 26 03:16:16 5c3s1-node4 systemd[1]: Starting Raise network interfaces...
Oct 26 03:16:16 5c3s1-node4 sh[985]: /etc/network/interfaces.d/interfaces: Is a directory
Oct 26 03:16:16 5c3s1-node4 ifup[1036]: /etc/network/interfaces.d/interfaces: Is a directory
Oct 26 03:16:17 5c3s1-node4 ifup[1036]: /sbin/ifup: waiting for lock on /run/network/ifstate.em1
Oct 26 03:16:23 5c3s1-node4 systemd[1]: Started Raise network interfaces.
root@5c3s1-node4:~#