Re: ceph OSD facts file

[Loic Dachary <loic@dachary.org>]

Hi Ken,

I'll work on http://tracker.ceph.com/issues/14972 and create that script.

Thanks for a nice and precise description :-)

On 03/03/2016 05:50, Ken Dreyer wrote:
> Hi Loic,
> 
> In Red Hat we're interested in having a Ceph "facts" file that we can
> integrate with RHEL's subscription-manager (upstream
> http://www.candlepinproject.org/ fyi) in order to report on the
> available raw disk capacity available per OSD.
> 
> We need a script to write a "/etc/rhsm/facts/ceph_disk.facts" file.
> That file needs to contain JSON of the form:
> 
> {
>   "band.storage.usage": <integer number of TB used on this node, such as 55>
> }
> 
> for example:
> {
>   "band.storage.usage": 55
> }
> 
> As long as that file exists (and it can be named anything that ends in
> ".facts") the contents will be read in and added to the system facts.
> On RHEL this can be verified by running `subscription-manager facts`
> to ensure that your value is showing up properly.
> 
> In terms of creating this .facts file, we will need a script to do
> that. We could call it /usr/bin/ceph-update-fact-file, or make it a
> ceph-disk sub-command, or whatever you want, really.
> 
> The facts file should be kept up-to-date every four hours, which makes
> me think that we could implement this as a systemd service and timer.
> Something like
> 
>   $ cat /etc/systemd/system/ceph-update-facts-file.service
> 
>   [Unit]
>   Description=Update Ceph OSD fact file
> 
>   [Service]
>   Type=oneshot
>   ExecStart=/usr/bin/ceph-update-fact-file
> 
> 
> ...and:
> 
>   $ cat /etc/systemd/system/ceph-update-facts-file.timer
>   [Unit]
>   Description=Trigger an automatic rewrite every four hours
> 
>   [Timer]
>   OnCalendar=4hours
>   Persistent=true
> 
>   [Install]
>   WantedBy=multi-user.target
> 
> (The above is untested, it's just an idea).  What do you think?
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-- 
Loïc Dachary, Artisan Logiciel Libre
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