ceph rbd namespace

# rbd --namespace $namespace $command $pool/$image
# rbd $command $pool/$namespace/$image

[root@ceph-1:~/ceph-cluster]# rbd namespace ls ceph-rbd --format=json
[]

[root@ceph-1:~/ceph-cluster]# rbd namespace create ceph-rbd/ns1

[root@ceph-1:~/ceph-cluster]# rbd namespace ls ceph-rbd --format=json
[{"name":"ns1"}]

[root@ceph-1:~/ceph-cluster]# rbd create ceph-rbd/ns1/rbd-image1.img --size 1024

[root@ceph-1:~/ceph-cluster]# rbd ls ceph-rbd --long
NAME          SIZE  PARENT FMT PROT LOCK 
rbd-image.img 1 GiB          2 
          
[root@ceph-1:~/ceph-cluster]# rbd ls ceph-rbd/ns1 --long
NAME           SIZE  PARENT FMT PROT LOCK 
rbd-image1.img 1 GiB          2   

[root@ceph-1:~/ceph-cluster]# rbd map ceph-rbd/ns1/rbd-image1.img
rbd: sysfs write failed
In some cases useful info is found in syslog - try "dmesg | tail".
rbd: map failed: (22) Invalid argument

[root@ceph-1:~/ceph-cluster]# dmesg |tail
[......]
[18427.446585] rbd: rbd0: capacity 1073741824 features 0x5
[24449.735082] libceph: bad option at '_pool_ns=ns1'

[root@ceph-1:~/ceph-cluster]# rbd info ceph-rbd/ns1/rbd-image1.img
rbd image 'rbd-image1.img':
    size 1 GiB in 256 objects
    order 22 (4 MiB objects)
    snapshot_count: 0
    id: 25c26241ea4ac
    block_name_prefix: rbd_data.25c26241ea4ac
    format: 2
    features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
    op_features: 
    flags: 
    create_timestamp: Wed Feb  3 15:57:13 2021
    access_timestamp: Wed Feb  3 15:57:13 2021
    modify_timestamp: Wed Feb  3 15:57:13 2021

[root@ceph-1:~/ceph-cluster]# rbd feature disable ceph-rbd/ns1/rbd-image1.img deep-flatten 
 
[root@ceph-1:~/ceph-cluster]# rbd feature disable ceph-rbd/ns1/rbd-image1.img fast-diff 

[root@ceph-1:~/ceph-cluster]# rbd device map ceph-rbd/ns1/rbd-image1.img
/dev/rbd0

[root@ceph-1:~/ceph-cluster]# rbd showmapped
id pool namespace image   snap device
0  rbd  ns1    rbd-image1.img -    /dev/rbd0

[root@ceph-1:~/ceph-cluster]# uname -ar
Linux ceph-1 5.5.6-1.el7.elrepo.x86_64 #1 SMP Mon Oct 19 16:18:59 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
​
[root@ceph-1:~/ceph-cluster]# rbd device unmap /dev/rbd0

[root@ceph-1:~/ceph-cluster]# rbd rm ceph-rbd/ns1/rbd-image1.img

[root@ceph-1:~/ceph-cluster]# rbd namespace remove ceph-rbd/ns1

[root@ceph-1:~/ceph-cluster]# ceph auth get-or-create client.$name 
  mon 'profile rbd' 
  osd 'profile rbd namespace=$namespace'
and go:

[root@ceph-1:~/ceph-cluster]# ls /etc/ceph/ceph.client.$name.keyring
/etc/ceph/ceph.client.$name.keyring
[root@ceph-1:~/ceph-cluster]# rbd -n client.$name ls
images: (1) Operation not permitted
rbd: listing images failed: (1) Operation not permitted
[root@ceph-1:~/ceph-cluster]# rbd -n client.$name ls --namespace=ns1
rbd-image1.img