[ceph-users] mount rbd read only

Ashley Merrick singapore at amerrick.co.uk
Thu Nov 8 04:08:13 PST 2018


What command are you using to mount the /dev/rbd0 to start with? You seem
to have missed that on your copy and paste.

On Thu, Nov 8, 2018 at 8:06 PM ST Wong (ITSC) <ST at itsc.cuhk.edu.hk> wrote:

> Hi,
>
>
>
> We created a testing rbd block device image as following:
>
>
>
> ----- cut here -------
>
> # rbd create 4copy/foo --size 10G
>
> # rbd feature disable 4copy/foo object-map fast-diff deep-flatten
>
> # rbd --image 4copy/foo info
>
> rbd image 'foo':
>
>         size 10 GiB in 2560 objects
>
>         order 22 (4 MiB objects)
>
>         id: 122f36b8b4567
>
>         block_name_prefix: rbd_data.122f36b8b4567
>
>         format: 2
>
>         features: layering, exclusive-lock
>
>         op_features:
>
>         flags:
>
>         create_timestamp: Thu Nov  8 19:42:25 2018
>
>
>
> ----- cut here -------
>
>
>
> Then try to mount it on client but got error and can’t be mounted:
>
>
>
> ----- cut here -------
>
> # mount  /dev/rbd0 /mnt
>
> mount: /dev/rbd0 is write-protected, mounting read-only
>
> mount: unknown filesystem type '(null)'
>
> ----- cut here -------
>
>
>
> Did we do any step incorrect?  We’re using mimic.   Thanks.
>
>
>
>
>
>
>
> Besides, the rbd client is deployed through ceph-ansible as client role
> and found that the ceph.client.admin.keyring from admin server was also
> copied to the client machine.  Is it necessary?   Thanks a lot.
>
>
>
> Best Regards,
>
> /ST Wong
> _______________________________________________
> ceph-users mailing list
> ceph-users at lists.ceph.com
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
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