gpmidi
3 May 2020 
[ceph: root@xxxxxx0 /]# ceph orch host add xxxxxxxxxxx1
Error EINVAL: Traceback (most recent call last):
  File "/usr/share/ceph/mgr/mgr_module.py", line 1153, in _handle_command
    return self.handle_command(inbuf, cmd)
  File "/usr/share/ceph/mgr/orchestrator/_interface.py", line 110, in handle_command
    return dispatch[cmd['prefix']].call(self, cmd, inbuf)
  File "/usr/share/ceph/mgr/mgr_module.py", line 308, in call
    return self.func(mgr, **kwargs)
  File "/usr/share/ceph/mgr/orchestrator/_interface.py", line 72, in <lambda>
    wrapper_copy = lambda *l_args, **l_kwargs: wrapper(*l_args, **l_kwargs)
  File "/usr/share/ceph/mgr/orchestrator/_interface.py", line 63, in wrapper
    return func(*args, **kwargs)
  File "/usr/share/ceph/mgr/orchestrator/module.py", line 179, in _add_host
    raise_if_exception(completion)
  File "/usr/share/ceph/mgr/orchestrator/_interface.py", line 628, in raise_if_exception
    raise e
OSError: cannot send (already closed?)

Fix: 

  1. Copy `/etc/yum.repos.d/ceph.repo` from the existing orch host to the new host
  2. Install `cephadm` via yum
  3. Try again

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