Planet Ceph

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June 27, 2017

The new Ceph container demo is super dope!

Title

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:

Title

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

Source: Sebastian Han (The new Ceph container demo is super dope!)

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