I have been extensively working on ceph-docker for the last few months and it’s getting better. With the upcoming arrival of Ceph Luminous (next LTS), Bluestore will be the default backend to store objects. Thus, I had to spend some time working on improving the support for Bluestore.

Now, if you want to prepare a device with Bluestore you can specify different device for:

• OSD_DEVICE: device where data will be stored
• OSD_BLUESTORE_BLOCK_DB: device that store RocksDB metadata
• OSD_BLUESTORE_BLOCK_WAL: device that stores RocksDB write-ahead journal

See it in action, this is the command to prepare a Bluestore OSD:

$ docker run -d \
--net=host \
--pid=host \
--privileged=true \
-v /etc/ceph:/etc/ceph \
-v /var/lib/ceph/:/var/lib/ceph/ \
-v /dev/:/dev/ \
-e OSD_DEVICE=/dev/sda \
-e OSD_BLUESTORE_BLOCK_WAL=/dev/sdb \
-e OSD_BLUESTORE_BLOCK_DB=/dev/sdc \
-e CEPH_DAEMON=OSD_CEPH_DISK_PREPARE \
-e OSD_BLUESTORE=1 \
ceph/daemon

Soon, Bluestore will be the ‘real’ default and the OSD_BLUESTORE=1 won’t be necessary anymore.

Hopefully, more posts coming soon :).