Hello, In the January Tech Talk (PostgreSQL on Ceph under Mesos/Aurora with Docker [https://youtu.be/OqlC7S3cUKs]) we presented a challenge we are facing at Medallia when running databases on ceph under mesos/aurora/docker; which is related to prevent mapping/mounting the same rbd image in two hosts at the same time during network partitions. As a workaround it was mentioned that we are wrapping rbd in a shell script that executes extra logic around certain operations: - On Map; rbd lock add <image> - If no success; then - "rbd status <image>": check for Watchers, 3 times each 15 secs - If found, ABORT the mapping. The image is still in use in a host that is healthy - "ceph osd blacklist add <previous lock holder>". Image locked without a watcher - steal the lock in <image> - map the image - On Unmap; - rbd lock remove - On reboot of server; - "ceph osd blacklist rm <self>" I was wondering if this mechanism could be incorporated as part of the rbd CLI, of course controlled by an option during map. We'll be happy to work on it, but want to check the feasibility of having the patch accepted. Mauricio Garavaglia mauricio@xxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
