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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