systemd and RDMA

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Hi Cephers,

In order to use systemctl with RDMA messenger we need to make few changes to /etc/systemd/system/
1. Set PrivateDevices=no
2. Set LimitMEMLOCK=infinity
see PR: https://github.com/ceph/ceph/pull/13305

I got few rejects suggesting to change those params only when actually using RDMA.
Since systemd scripts are the first to run we cannot check it in ceph code.

Any suggestion on how to check messenger type and set PrivateDevices and LimitMEMLOCK accordingly? 

TIA,
Adir Lev


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