On 29/07/2020 14:54, Jason Dillaman wrote:
On Wed, Jul 29, 2020 at 6:23 AM Wido den Hollander <wido@xxxxxxxx> wrote:
Hi,
I'm trying to have clients read the 'rbd_default_data_pool' config
option from the config store when creating a RBD image.
This doesn't seem to work and I'm wondering if somebody knows why.
It looks like all string-based config overrides for RBD are ignored:
2020-07-29T08:52:44.393-0400 7f2a97fff700 4 set_mon_vals failed to
set rbd_default_data_pool = rbd-data: Configuration option
'rbd_default_data_pool' may not be modified at runtime
librbd always accesses the config options in a thread-safe manner, so
I'll open a tracker ticket to flag all the RBD string config options
are runtime updatable (primitive data type options are implicitly
runtime updatable).
I wasn't updating it at runtime, I just wanted to make sure that I don't
have to set this in ceph.conf everywhere (and libvirt doesn't read
ceph.conf)
But it seems that Python works:
#!/usr/bin/python3
import rados
import rbd
cluster = rados.Rados(conffile='/etc/ceph/ceph.conf')
cluster.connect()
ioctx = cluster.open_ioctx('rbd')
rbd_inst = rbd.RBD()
size = 4 * 1024**3 # 4 GiB
rbd_inst.create(ioctx, 'myimage', size)
ioctx.close()
cluster.shutdown()
And then:
$ ceph config set client rbd_default_data_pool rbd-data
rbd image 'myimage':
size 4 GiB in 1024 objects
order 22 (4 MiB objects)
snapshot_count: 0
id: 1aa963a21028
data_pool: rbd-data
block_name_prefix: rbd_data.2.1aa963a21028
format: 2
features: layering, exclusive-lock, object-map, fast-diff,
deep-flatten, data-pool
I haven't tested this through libvirt yet. That's the next thing to test.
Wido
I tried:
$ ceph config set client rbd_default_data_pool rbd-data
$ ceph config set global rbd_default_data_pool rbd-data
They both show up under:
$ ceph config dump
However, newly created RBD images with the 'rbd' CLI tool do not use the
data pool.
If I set this in ceph.conf it works:
[client]
rbd_default_data_pool = rbd-data
Somehow librbd isn't fetching these configuration options. Any hints on
how to get this working?
The end result is that libvirt (which doesn't read ceph.conf) should
also be able to create RBD images with a different data pool.
Wido
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