On Thu, 2022-02-03 at 12:01 +0100, William Edwards wrote: > 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. > The in-kernel client itself does not pay any attention to ceph.conf. The mount helper program (mount.ceph) will look at that ceph configs and keyrings to search for mon addresses and secrets for mounting if you don't provide them in the device string and mount options. -- Jeff Layton <jlayton@xxxxxxxxxx> _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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