Hi,
On 02/01/2018 07:21 AM, Mayank Kumar wrote:
Thanks Gregory and Burkhard
In kubernetes we use rbd create and rbd map/unmap commands. In this
perspective are you referring to rbd as the client or after the image
is created and mapped, is there a different client running inside the
kernel that you are referring to which can get osd and mon updates ?
My question is mainly after we have run the rbd ccreate and rbd map
commands, does a client still exsit or its gone ? If the rbd image is
mapped on a host and then if osd or mon ips change , what happens in
this case ?
AFAIK the 'rbd create' command is creating its own client userspace
session, which is terminated after the command is finished.
'rbd map' is instructing the kernel to map the given image to a block
device. And the kernel is keeping track of map changes notified by the
mons, including osd/mon ip changes.
You can verify this by having a look at the /sys/kernel/debug/ceph
directory. All active kernel client sessions (rbd map or cephfs) create
a subdirectory contain some information about the current state of the
client.
Regards,
Burkhard
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