I have been recently working on refactoring our Ceph container images. We used to have two separate images for daemon and demo. Recently, for Luminous, I decided to merge the demo container into daemon. It makes everything easier, code is in a single place, we only have a single image to test with the CI and users have a single image to play with.

As reminder, this is what the container can do for you:

• Bootstrap a single Ceph monitor
• Bootstrap a single Ceph OSD with Bluestore (running on a filesystem)
• Bootstrap a single MDS server
• Bootstrap a RGW instance with optionally a user and the ability to interact with s3cmd.
• Bootstrap a rbd-mirror daemon
• Bootstrap a ceph-mgr daemon with its dashboard

This is how to run it:

docker run -d \
--name demo \
-e MON_IP=0.0.0.0 \
-e CEPH_PUBLIC_NETWORK=0.0.0.0/0 \
--net=host \
-v /var/lib/ceph:/var/lib/ceph \
-v /etc/ceph:/etc/ceph \
-e CEPH_DEMO_UID=qqq \
-e CEPH_DEMO_ACCESS_KEY=qqq \
-e CEPH_DEMO_SECRET_KEY=qqq \
-e CEPH_DEMO_BUCKET=qqq \
ceph/daemon \
demo

Obviously adapt both MON_IP and CEPH_PUBLIC_NETWORK with your host specificity. It’s handy to bindmount both /var/lib/ceph and /etc/ceph so the container can survive a restart.

Output example on my test system:

$ sudo ceph -s
  cluster:
    id:     940848cd-658a-46d1-8161-4bcd37c36ce9
    health: HEALTH_OK
 
  services:
    mon: 1 daemons, quorum leseb-tarox
    mgr: leseb-tarox(active)
    mds: 1/1/1 up {0=0=up:active}
    osd: 1 osds: 1 up, 1 in
 
  data:
    pools:   8 pools, 120 pgs
    objects: 216 objects, 5030 bytes
    usage:   1091 MB used, 9212 MB / 10303 MB avail
    pgs:     120 active+clean

Obviously, this container enables the new dashboard manager:

Enjoy this nice preview on Luminous, the current image from the Docker Hub is build on the first Luminous RC.