Hi, The main question is that /etc/ceph is not longer needed when you use etcd...
docker run -d --net=host \ -v /var/lib/ceph:/var/lib/ceph \ -e MON_IP=192.168.0.20 \ -e CEPH_PUBLIC_NETWORK=192.168.0.0/24 \ -e KV_TYPE=etcd \ -e KV_IP=192.168.0.20 \ ceph/daemon mon I'd like to know/predict the behavior of the system when some pieces could fail. Thanks a lot! Óscar El mar., 16 jul. 2019 18:23, Janne Johansson <icepic...@gmail.com> escribió: > Den tis 16 juli 2019 kl 18:15 skrev Oscar Segarra <oscar.sega...@gmail.com > >: > >> Hi Paul, >> That is the initial question, is it possible to recover my ceph cluster >> (docker based) if I loose all information stored in the etcd... >> I don't know if anyone has a clear answer to these questions.. >> 1.- I bootstrap a complete cluster mons, osds, mgr, mds, nfs, etc using >> etcd as a key store >> 2.- There is an electric blackout and all nodes of my cluster goes down >> and all data in my etcd is lost (but muy osd disks have useful data) >> > > Not having run container versions in my case made me reply wrongly last > time, but I think it is still true that a running ceph will not store > anything useful in etcd, but the info stuffed there by your deployment > scripts is just _a_ way to get keys out to newly made containers while > deploying, and not the _only_ way. > > Also, a running ceph cluster will (probably!) not read anything useful out > of etcd later on, since it keeps its own databases for all keys. Hence, the > specific question about "I have ceph running, it was deployed using scripts > and etcd for transport of keys, then it bombs out and for reason X, all > etcd files are gone but rest is still there, then it boots up" should > probably give you a working ceph cluster back, assuming no other part (like > network configs, firewall rules or so) needs etcd for its own purposes. If > the OS is gone, or all of /etc is gone or something like that, then the > machine will not boot and ceph will not run but that is kind of obvious. > > -- > May the most significant bit of your life be positive. >
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