You could create a key ring that only has perms to mount the RBD and read only to the mon’s.
Depends if anyone that you wouldn’t trust with ceph commands has access to that VM / host.
On Fri, 9 Nov 2018 at 10:47 PM, ST Wong (ITSC) <ST@xxxxxxxxxxxxxxxx> wrote:
Stupid me. I was focus on learning CEPH commands and forget something basic - haven't done mkfs. Sorry for the trouble caused.
Btw, is ceph.client.admin.keyring a must on client that mount rbd device? Any security concern?
Sorry for the newbie questions.
Thanks for all responded.
Best Rgds
/st wong
-----Original Message-----
From: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> On Behalf Of Wido den Hollander
Sent: Thursday, November 8, 2018 8:31 PM
To: ceph-users@xxxxxxxxxxxxxx
Subject: Re: mount rbd read only
On 11/8/18 1:05 PM, ST Wong (ITSC) 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)'
Did you create a filesystem on it with mkfs? Are you sure there is a FileSystem on it?
Wido
>
> ----- 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@xxxxxxxxxxxxxx
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
_______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
