error output 

[localhost] local: installhostkeytab -r chromeos-skunk-2.mtv.corp.google.com

Requesting keytab for chromeos-skunk-2.mtv.corp.google.com please wait ...
Reusing existing SSO cookie.

Installing keytab on chromeos-skunk-2.mtv.corp.google.com please wait ...
No existing session

Exceptions encountered on the following hosts:
chromeos-skunk-2.mtv.corp.google.com: No existing session
See http://go/installhostkeytab for more information

Fatal error: local() encountered an error (return code 1) while executing 'installhostkeytab -r chromeos-skunk-2.mtv.corp.google.com'

Aborting.
2017-08-10 15:51:48,261 ERRO| Traceback (most recent call last):
  File "/usr/local/google/home/nxia/chromiumos/chromeos-admin/venv/server_management_lib/tasks/task.py", line 66, in run
    self._run()
  File "/usr/local/google/home/nxia/chromiumos/chromeos-admin/venv/server_management_lib/tasks/atomic_shard.py", line 70, in _run
    self._bootstrap()
  File "/usr/local/google/home/nxia/chromiumos/chromeos-admin/venv/server_management_lib/tasks/atomic_common.py", line 93, in decorated_func
    return func(self)
  File "/usr/local/google/home/nxia/chromiumos/chromeos-admin/venv/server_management_lib/tasks/atomic_common.py", line 154, in _bootstrap
    fabfile.install_keytab()
  File "/usr/local/google/home/nxia/chromiumos/chromeos-admin/venv/server_management_lib/fabfile.py", line 150, in install_keytab
    local('installhostkeytab -r %s' % env.host_string)
  File "/usr/local/google/home/nxia/.cache/cros_venv/venv-2.7.6-2acae930a65a57e1e4b565419962f29e/local/lib/python2.7/site-packages/fabric/operations.py", line 1237, in local
    error(message=msg, stdout=out, stderr=err)
  File "/usr/local/google/home/nxia/.cache/cros_venv/venv-2.7.6-2acae930a65a57e1e4b565419962f29e/local/lib/python2.7/site-packages/fabric/utils.py", line 358, in error
    return func(message)
  File "/usr/local/google/home/nxia/.cache/cros_venv/venv-2.7.6-2acae930a65a57e1e4b565419962f29e/local/lib/python2.7/site-packages/fabric/utils.py", line 54, in abort
    raise env.abort_exception(msg)
FabricException: local() encountered an error (return code 1) while executing 'installhostkeytab -r chromeos-skunk-2.mtv.corp.google.com'

2017-08-10 15:51:48,261 ERRO| local() encountered an error (return code 1) while executing 'installhostkeytab -r chromeos-skunk-2.mtv.corp.google.com'
2017-08-10 15:51:48,261 INFO| Printing out task report.
{
  "sub_reports": [],
  "exception": "FabricException(\"local() encountered an error (return code 1) while executing 'installhostkeytab -r chromeos-skunk-2.mtv.corp.google.com'\",)",
  "is_successful": false,
  "description": "local() encountered an error (return code 1) while executing 'installhostkeytab -r chromeos-skunk-2.mtv.corp.google.com'",
  "arguments_used": {
    "host_server": "chromeos-skunk-2.mtv.corp.google.com"
  },
  "task_name": "ShardProvisionTask"
}