Using ceph.conf for CephFS kernel client with Nautilus cluster

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Hi,

I need to set options from https://docs.ceph.com/en/nautilus/cephfs/client-config-ref/ . I assume these should be placed in the 'client' section in ceph.conf.

The documentation for Nautilus says that ceph.conf should be placed when FUSE is used, see: https://docs.ceph.com/en/nautilus/cephfs/mount-prerequisites/ . However, ceph.conf is not mentioned on https://docs.ceph.com/en/nautilus/cephfs/fstab/#kernel-driver . Therefore, the clients don't currently have an /etc/ceph/ceph.conf.

In contrast, the documentation for Pacific says that there **must** be a ceph.conf in any case: https://docs.ceph.com/en/latest/cephfs/mount -prerequisites/#general-pre-requisite-for-mounting-cephfs

Newer Ceph versions contain the command 'ceph config generate-minimal-conf'. I can deduce from the command's code what ceph.conf on the client should look like: https://github.com/ceph/ceph/blob/master/src/mon/ConfigMonitor.cc#L423

L428: [global]
L429: fsid
L430 - L448: mon_host (not sure what 'is_legacy' and 'size() == 1' entail; I guess I'll see)
L449: newline
L450 - L458: This is deduced from https://github.com/ceph/ceph/blob/a67d1cf2a7a4031609a5d37baa01ffdfef80e993/src/mon/ConfigMap.cc#L98 . get_minimal_conf only adds options with the flags FLAG_NO_MON_UPDATE or FLAG_MINIMAL_CONF, but I don't see any 'set_flags' statements in master; so I'm not sure which options have those flags.

So the resulting config would contain the global section with 'fsid' and 'mon_host', my custom options in 'client', and possibly 'keyring'.

Questions:

- Is it acceptable to use a ceph.conf on the kernel client when using a Nautilus cluster? It can be specified as the 'conf' mount option, but as the documentation barely mentions it for kernel clients, I'm not 100% sure.
- Is my evaluation of the 'minimal' config correct?
- Which options have the FLAG_NO_MON_UPDATE and FLAG_MINIMAL_CONF flags? / Where are flags set?

The cluster is running Ceph 14.2.22. The clients are running Ceph 12.2.11. All clients use the kernel client.

--
With kind regards,

William Edwards

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