On 07/11/2013 09:03 AM, [email protected] wrote:
Hi folks,
I face the difficulty that I have to change ip adresses in the
public network for the monitors.
What needs to be done beside the change of the ceph.conf?
ceph.conf is only used by other daemons (that aren't the monitors) and
clients. The monitors however use the monmap (monitor map) to assess
where all the monitors are and who they are -- this map is kept by the
monitors themselves.
In other words, solely changing ceph.conf and firing up the monitors
with their new ips will result in the monitors committing suicide, as
they will not find themselves (given their new ips) in the monmap.
I would advise you to read through the ceph docs' "Adding/Removing
monitors", section "Changing a Monitor's IP Address" [1].
Although the appropriate way to do this would be to keep the current
monitors in place, adding new monitors with new ips (one at a time) and
letting the cluster become healthy, this assumes two things: 1) your new
monitor's location are able to communicate with the current monitor's
location, and the latencies are small enough for it to work; and 2) you
have spare hardware in which you can keep the new monitors as you're
adding them.
If one of these conditions are not satisfiable, you may want to do it
the dirty way: generate a new monmap with the new monitor locations,
shutdown your monitors, move them over to their new location, inject the
new monmap, and restart the monitors. This is also described in [1].
Hope this helps, and let us know if you run into problems.
-Joao
[1] - http://ceph.com/docs/master/rados/operations/add-or-rm-mons/
Best regards
Joachim Tork
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--
Joao Eduardo Luis
Software Engineer | http://inktank.com | http://ceph.com
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