Hi!
I think, that renaming cluster - is not only mv config file. We try to change name of test Hammer
cluster, created with ceph-deploy and got some issues.
In default install, naming of many parts are derived from cluster name. For example, cephx keys are
stored not in "ceph.client.admin.keyring", but "$CLUSTERNAME.client.admin.keyring", so we
have to rename keyrings also.
The same thing is for OSD/MON mounting points: instead /var/lib/ceph/osd/ceph-$OSDNUM,
after renaming cluster, daemons try to run OSD from /var/lib/ceph/osd/$CLUSTERNAME-$OSDNUM.
Of course, there are no such mountpoints and we manually create them, mount fs and re-run OSDs.
There is one unresolved issue with udev rules: after node reboot, filesystems are mounted by udev
into the old mountpoints. As the cluster is for testing - this is not a big thing.
So, be carefull while renaming production or loaded cluster.
PS: All above is my IMHO and I may be wrong. ;)
Megov Igor
CIO, Yuterra
I think, that renaming cluster - is not only mv config file. We try to change name of test Hammer
cluster, created with ceph-deploy and got some issues.
In default install, naming of many parts are derived from cluster name. For example, cephx keys are
stored not in "ceph.client.admin.keyring", but "$CLUSTERNAME.client.admin.keyring", so we
have to rename keyrings also.
The same thing is for OSD/MON mounting points: instead /var/lib/ceph/osd/ceph-$OSDNUM,
after renaming cluster, daemons try to run OSD from /var/lib/ceph/osd/$CLUSTERNAME-$OSDNUM.
Of course, there are no such mountpoints and we manually create them, mount fs and re-run OSDs.
There is one unresolved issue with udev rules: after node reboot, filesystems are mounted by udev
into the old mountpoints. As the cluster is for testing - this is not a big thing.
So, be carefull while renaming production or loaded cluster.
PS: All above is my IMHO and I may be wrong. ;)
Megov Igor
CIO, Yuterra
От: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> от имени Jan Schermer <jan@xxxxxxxxxxx>
Отправлено: 18 августа 2015 г. 15:18
Кому: Erik McCormick
Копия: ceph-users@xxxxxxxxxxxxxx
Тема: Re: Rename Ceph cluster
Отправлено: 18 августа 2015 г. 15:18
Кому: Erik McCormick
Копия: ceph-users@xxxxxxxxxxxxxx
Тема: Re: Rename Ceph cluster
I think it's pretty clear:
"For example, when you run multiple clusters in a federated architecture, the cluster name (e.g., us-west, us-east) identifies the cluster for the current CLI session. Note: To identify the cluster name on the command line interface, specify the a Ceph configuration
file with the cluster name (e.g., ceph.conf, us-west.conf, us-east.conf, etc.). Also see CLI usage (ceph --cluster {cluster-name})."
But it could be tricky on the OSDs that are running, depending on the distribution initscripts - you could find out that you can't "service ceph stop osd..." anymore after the change, since it can't find it's pidfile anymore. Looking at Centos initscript
it looks like it accepts "-c conffile" argument though.
(So you should be managins OSDs with "-c ceph-prod.conf" now?)
Jan
On 18 Aug 2015, at 14:13, Erik McCormick <emccormick@xxxxxxxxxxxxxxx> wrote:
I've got a custom named cluster integrated with Openstack (Juno) and didn't run into any hard-coded name issues that I can recall. Where are you seeing that?
As to the name change itself, I think it's really just a label applying to a configuration set. The name doesn't actually appear *in* the configuration files. It stands to reason you should be able to rename the configuration files on the client side and leave the cluster alone. It'd be with trying in a test environment anyway.
-Erik
On Aug 18, 2015 7:59 AM, "Jan Schermer" <jan@xxxxxxxxxxx> wrote:
This should be simple enough
mv /etc/ceph/ceph-prod.conf /etc/ceph/ceph.conf
No? :-)
Or you could set this in nova.conf:
images_rbd_ceph_conf=/etc/ceph/ceph-prod.conf
Obviously since different parts of openstack have their own configs, you'd have to do something similiar for cinder/glance... so not worth the hassle.
Jan
> On 18 Aug 2015, at 13:50, Vasiliy Angapov <angapov@xxxxxxxxx> wrote:
>
> Hi,
>
> Does anyone know what steps should be taken to rename a Ceph cluster?
> Btw, is it ever possbile without data loss?
>
> Background: I have a cluster named "ceph-prod" integrated with
> OpenStack, however I found out that the default cluster name "ceph" is
> very much hardcoded into OpenStack so I decided to change it to the
> default value.
>
> Regards, Vasily.
> _______________________________________________
> ceph-users mailing list
> ceph-users@xxxxxxxxxxxxxx
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