An unexpected error while registering a variable - "unhashable type: 'list'"

[Michał Markiewicz]

Hi, I'm trying to automate the process of setting up kubernetes cluster for training purposes.

The tasks to register the command for joining workers to a cluster is as follows:

- name: get join token for workers
  shell: kubeadm token create --print-join-command
  register: token

I run the playbook in verbose mode and I can see that the command executes properly, but the output can not be registered as there is an unexpected exception:

    "rc": 0,
    "start": "2019-01-24 17:46:01.951209",
    "stderr": "",
    "stderr_lines": [],
    "stdout": "kubeadm join 192.168.0.22:6443 --token gh0qup.pxkqnbnr3w0gj4at --discovery-token-ca-cert-hash sha256:b1d05a9a32918aa7ea84f73742b104856585a56e9cc31bbed6774d1a10ecaed0",
    "stdout_lines": [
        "kubeadm join 192.168.0.22:6443 --token gh0qup.pxkqnbnr3w0gj4at --discovery-token-ca-cert-hash sha256:b1d05a9a32918aa7ea84f73742b104856585a56e9cc31bbed6774d1a10ecaed0"
    ]
}
ERROR! Unexpected Exception, this is probably a bug: unhashable type: 'list'
the full traceback was:

Traceback (most recent call last):
  File "/usr/bin/ansible-playbook", line 118, in <module>
    exit_code = cli.run()
  File "/usr/lib/python2.7/dist-packages/ansible/cli/playbook.py", line 122, in run
    results = pbex.run()
  File "/usr/lib/python2.7/dist-packages/ansible/executor/playbook_executor.py", line 159, in run
    result = self._tqm.run(play=play)
  File "/usr/lib/python2.7/dist-packages/ansible/executor/task_queue_manager.py", line 290, in run
    play_return = strategy.run(iterator, play_context)
  File "/usr/lib/python2.7/dist-packages/ansible/plugins/strategy/linear.py", line 248, in run
    task_vars = self._variable_manager.get_vars(play=iterator._play, host=host, task=task)
  File "/usr/lib/python2.7/dist-packages/ansible/vars/manager.py", line 418, in get_vars
    all_vars['ansible_delegated_vars'] = self._get_delegated_vars(play, task, all_vars)
  File "/usr/lib/python2.7/dist-packages/ansible/vars/manager.py", line 511, in _get_delegated_vars
    if delegated_host_name in delegated_host_vars:
TypeError: unhashable type: 'list'

I'm running the playbook on Centos7 minimal and the ansible version is:

 ansible --version
ansible 2.5

Can someone help here? I was googling for a while but didn't find the answer..

Regards,

Michal

[Matt Martz]

I'd have to guess that you gave a list to delegate_to somewhere. Instead of a single value

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Matt Martz
@sivel
sivel.net