Single MDS cephx key

[Travis Nielsen <Travis.Nielsen@Quantum.com>]

Is it possible to use the same cephx key for all instances of MDS or do
they each require their own? Mons require the same keyring so I tried
following the same pattern by creating a keyring with "mds.", but the MDS
is complaining about not being authorized when it tries to start. Am I
missing something or is this not possible for MDS keys? If I create a
unique key for each MDS instance it works fine, but it would simplify my
scenario if I could use the same key. I'm running on Luminous.

The key was generated with this:
ceph auth get-or-create-key mds. osd allow * mds allow mon allow profile
mds



The keyring contents are:
[mds.]
key = AQD62spZw3zRGhAAkHHVokP3BDf8PEy4+vXGMg==


I run the following with that keyring:
ceph-mds --foreground --name=mds.mymds -i mymds

And I see the error:
2017-09-26 22:55:55.973047 7fb004459200 -1 mds.mds81c2n ERROR: failed to
authenticate: (22) Invalid argument



Thanks,
Travis