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
 |