Manager plugins issues on new ceph-mgr nodes

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Hello,

Running 14.2.3, updated from 14.2.1.
Until recently I've had ceph-mgr collocated with OSDs. I've installed
ceph-mgr on separate servers and everything looks OK in Ceph status
but there are multiple issues:

1. Dashboard only runs on old mgr servers. Tried restarting the
daemons and disable/enable the dashboard plugin. New mgr won't listen
on the dashboard port.
2. To (re)enable the dashboard plugin I had to use "--force"
    # ceph mgr module enable dashboard
    Error ENOENT: all mgr daemons do not support module 'dashboard',
pass --force to force enablement
3. When accessing the Cluster -> Manager modules menu in the dashboard
I get a 500 error message. The exact error below:

----
2019-09-10 15:01:39.270 7fb6d4916700  0 mgr[dashboard]
[10/Sep/2019:15:01:39] HTTP Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/cherrypy/_cprequest.py", line
656, in respond
    response.body = self.handler()
  File "/usr/lib/python2.7/site-packages/cherrypy/lib/encoding.py",
line 188, in __call__
    self.body = self.oldhandler(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/cherrypy/_cptools.py", line
221, in wrap
    return self.newhandler(innerfunc, *args, **kwargs)
  File "/usr/share/ceph/mgr/dashboard/services/exception.py", line 88,
in dashboard_exception_handler
    return handler(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/cherrypy/_cpdispatch.py",
line 34, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "/usr/share/ceph/mgr/dashboard/controllers/__init__.py", line
649, in inner
    ret = func(*args, **kwargs)
  File "/usr/share/ceph/mgr/dashboard/controllers/__init__.py", line
842, in wrapper
    return func(*vpath, **params)
  File "/usr/share/ceph/mgr/dashboard/controllers/mgr_modules.py",
line 35, in list
    obj['enabled'] = True
TypeError: 'NoneType' object does not support item assignment

2019-09-10 15:01:39.271 7fb6d4916700  0 mgr[dashboard]
[::ffff:192.168.15.55:54860] [GET] [500] [0.014s] [admin] [1.3K]
/api/mgr/module
2019-09-10 15:01:39.272 7fb6d4916700  0 mgr[dashboard] ['{"status":
"500 Internal Server Error", "version": "3.2.2", "detail": "The server
encountered an unexpected condition which prevented it from fulfilling
the request.", "traceback": "Traceback (most recent call last):\\n
File \\"/usr/lib/python2.7/site-packages/cherrypy/_cprequest.py\\",
line 656, in respond\\n    response.body = self.handler()\\n  File
\\"/usr/lib/python2.7/site-packages/cherrypy/lib/encoding.py\\", line
188, in __call__\\n    self.body = self.oldhandler(*args, **kwargs)\\n
 File \\"/usr/lib/python2.7/site-packages/cherrypy/_cptools.py\\",
line 221, in wrap\\n    return self.newhandler(innerfunc, *args,
**kwargs)\\n  File
\\"/usr/share/ceph/mgr/dashboard/services/exception.py\\", line 88, in
dashboard_exception_handler\\n    return handler(*args, **kwargs)\\n
File \\"/usr/lib/python2.7/site-packages/cherrypy/_cpdispatch.py\\",
line 34, in __call__\\n    return self.callable(*self.args,
**self.kwargs)\\n  File
\\"/usr/share/ceph/mgr/dashboard/controllers/__init__.py\\", line 649,
in inner\\n    ret = func(*args, **kwargs)\\n  File
\\"/usr/share/ceph/mgr/dashboard/controllers/__init__.py\\", line 842,
in wrapper\\n    return func(*vpath, **params)\\n  File
\\"/usr/share/ceph/mgr/dashboard/controllers/mgr_modules.py\\", line
35, in list\\n    obj[\'enabled\'] = True\\nTypeError: \'NoneType\'
object does not support item assignment\\n"}']
----

Anyone got the same problems after adding new manager nodes? Is there
something I'm missing here?

Thanks!
---
Alex Cucu
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