undercloud install fails if devices exist with no dhcp

[Derek Higgins]

On a baremetal host with multiple wired nic's

when running the undercloud install 20-os-net-config writes out /etc/os-net-config/dhcp_all_interfaces.yaml containing "use_dhcp: true" for each nic.
If any of them do not have dhcp configured then "os-net-config -c /etc/os-net-config/dhcp_all_interfaces.yaml -v --detailed-exit-codes --cleanup" fails

> openstack undercloud install
...
[2016/05/25 08:55:16 AM] [INFO] Writing config /etc/sysconfig/network-scripts/ifcfg-em1
[2016/05/25 08:55:16 AM] [INFO] Writing config /etc/sysconfig/network-scripts/route-em1
[2016/05/25 08:55:16 AM] [INFO] running ifup on interface: em2
Traceback (most recent call last):
  File "/bin/os-net-config", line 10, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/site-packages/os_net_config/cli.py", line 187, in main
    activate=not opts.no_activate)
  File "/usr/lib/python2.7/site-packages/os_net_config/impl_ifcfg.py", line 572, in apply
    self.ifup(interface)
  File "/usr/lib/python2.7/site-packages/os_net_config/__init__.py", line 164, in ifup
    self.execute(msg, '/sbin/ifup', interface)
  File "/usr/lib/python2.7/site-packages/os_net_config/__init__.py", line 144, in execute
    processutils.execute(cmd, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/oslo_concurrency/processutils.py", line 371, in execute
    cmd=sanitized_cmd)
oslo_concurrency.processutils.ProcessExecutionError: Unexpected error while running command.
Command: /sbin/ifup em2
Exit code: 1
Stdout: u'\nDetermining IP information for em2... failed.\n'
Stderr: u''
+ RETVAL=1
+ [[ 1 == 2 ]]
+ [[ 1 != 0 ]]
+ echo 'ERROR: configuration of safe defaults failed.'
ERROR: configuration of safe defaults failed.
[2016-05-25 08:56:17,994] (os-refresh-config) [ERROR] during configure phase. [Command '['dib-run-parts', '/usr/libexec/os-refresh-config/configure.d']' returned non-zero exit status 1]

[2016-05-25 08:56:17,995] (os-refresh-config) [ERROR] Aborting...
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 840, in install
    _run_orc(instack_env)
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 730, in _run_orc
    _run_live_command(args, instack_env, 'os-refresh-config')
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 401, in _run_live_command
    raise RuntimeError('%s failed. See log for details.' % name)
RuntimeError: os-refresh-config failed. See log for details.
Command 'instack-install-undercloud' returned non-zero exit status 1

[Brent Eagles (beagles)]

Is it possible to use net_config_override in undercloud.conf to workaround this issue?

[Derek Higgins (derekh)]

Closed this, the environment where I had this happen can't now be used to reproduce, will reopen again if its seen again.

[Simon Wright (simon-ocf)]

In case it helps someone.
I managed to replicate this failure by setting local_interface in undercloud.conf to bridge name (eg br-ctlplane), whereas it should be NIC name (eg eth0).