Hi Oscar, ceph itself does not use etcd for anything. Hence, a deployed and operational cluster will not notice the presence or absence of an etcd store. How much a loss of etcd means for your work depends on what you plan to store in it. If you look at the ceph/daemon container on docker, the last time I checked the code it stored only very little data and all of this would be re-build from the running cluster if you create and run a new etcd container. In this framework, it only affects how convenient deployment of new servers is. You could easily copy the few files it holds by hand to a new server. So etcd is not critical at all. You should have a look at the deploy scripts/method for checking under what conditions you can loose and re-build an etcd store. In the example of ceph/daemon on docker, a rebuild requires execution on a node with the admin keyring (eg. a mon node) against a running cluster with mons in quorum. Best regards, ================= Frank Schilder AIT Risø Campus Bygning 109, rum S14 ________________________________________ From: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> on behalf of Oscar Segarra <oscar.segarra@xxxxxxxxx> Sent: 15 July 2019 11:55 To: ceph-users Subject: What if etcd is lost Hi, I'm planning to deploy a ceph cluster using etcd as kv store. I'm planning to deploy a stateless etcd docker to store the data. I'd like to know if ceph cluster will be able to boot when etcd container restarts (and looses al data written in it) If the etcd container restarts when the ceph cluster (osd, mds, mon, mgr) is working and stable, everything will continue working or any component will stop working? Mon's will be able to regen the keys? Thanks a lot in advance Óscar _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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