[ceph-users] mount rbd read only

Wido den Hollander wido at 42on.com
Thu Nov 8 04:30:41 PST 2018



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
> 
> 
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> 


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