Re: [PATCH 4/4] doc: document new CephFS mount device syntax

[Venky Shankar <vshankar@redhat.com>]

On Mon, Jun 28, 2021 at 8:57 PM Jeff Layton <jlayton@redhat.com> wrote:
>
> On Mon, 2021-06-28 at 13:25 +0530, Venky Shankar wrote:
> > Signed-off-by: Venky Shankar <vshankar@redhat.com>
> > ---
> >  Documentation/filesystems/ceph.rst | 23 ++++++++++++++++++++---
> >  1 file changed, 20 insertions(+), 3 deletions(-)
> >
> > diff --git a/Documentation/filesystems/ceph.rst b/Documentation/filesystems/ceph.rst
> > index 7d2ef4e27273..e46f9091b851 100644
> > --- a/Documentation/filesystems/ceph.rst
> > +++ b/Documentation/filesystems/ceph.rst
> > @@ -82,7 +82,7 @@ Mount Syntax
> >
> >  The basic mount syntax is::
> >
> > - # mount -t ceph monip[:port][,monip2[:port]...]:/[subdir] mnt
> > + # mount -t ceph user@fsid.fs_name=/[subdir] mnt -o mon_host=monip1[:port][/monip2[:port]]
> >
>
> The actual code lists the option as "mon_addr".

Good catch. The mount helper uses `mon_host`, however, the option
passed to the kernel is `mon_addr`.

>
> >  You only need to specify a single monitor, as the client will get the
> >  full list when it connects.  (However, if the monitor you specify
> > @@ -90,16 +90,33 @@ happens to be down, the mount won't succeed.)  The port can be left
> >  off if the monitor is using the default.  So if the monitor is at
> >  1.2.3.4::
> >
> > - # mount -t ceph 1.2.3.4:/ /mnt/ceph
> > + # mount -t ceph cephuser@07fe3187-00d9-42a3-814b-72a4d5e7d5be.cephfs=/ /mnt/ceph -o mon_host=1.2.3.4
> >
> >  is sufficient.  If /sbin/mount.ceph is installed, a hostname can be
> > -used instead of an IP address.
> > +used instead of an IP address and the cluster FSID can be left out
> > +(as the mount helper will fill it in by reading the ceph configuration
> > +file)::
> >
> > +  # mount -t ceph cephuser@cephfs=/ /mnt/ceph -o mon_host=mon-addr
> >
> > +Multiple monitor addresses can be passed by separating each address with a slash (`/`)::
> > +
> > +  # mount -t ceph cephuser@cephfs=/ /mnt/ceph -o mon_host=192.168.1.100/192.168.1.101
> > +
> > +When using the mount helper, monitor address can be read from ceph
> > +configuration file if available. Note that, the cluster FSID (passed as part
> > +of the device string) is validated by checking it with the FSID reported by
> > +the monitor.
> >
> >  Mount Options
> >  =============
> >
> > +  mon_host=ip_address[:port][/ip_address[:port]]
> > +     Monitor address to the cluster
> > +
>
> Might want to mention that "mon_addr" is just used to bootstrap the
> connection to the cluster, and that it'll follow the monmap after that
> point.

ACK

>
> > +  fsid=cluster-id
> > +     FSID of the cluster
> > +
> >    ip=A.B.C.D[:N]
> >       Specify the IP and/or port the client should bind to locally.
> >       There is normally not much reason to do this.  If the IP is not
>
> --
> Jeff Layton <jlayton@redhat.com>
>


-- 
Cheers,
Venky