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Run Ceph OSDs in docker


There are a number of environment variables which are used to configure
the execution of the OSD:

  • CLUSTER is the name of the ceph cluster (defaults to ceph)
  • OSD_ID is the (numeric) id of this OSD; if you don't have one, you can execute ceph osd create from another working node (such as a monitor). There is no default, and this variable is REQUIRED.

If the OSD is not already created (key, configuration, OSD data), the
following environment variables will control its creation:

  • WEIGHT is the of the OSD when it is added to the CRUSH map (default is 1.0)
  • JOURNAL is the location of the journal (default is the journal file inside the OSD data directory)
  • HOSTNAME is the name of the host; it is used as a flag when adding the OSD to the CRUSH map


Re: []

A user has reported a consterning (and difficult to diagnose) problem wherein the OSD crashes frequently due to Docker running out of sufficient open file handles. This is understandable, as the OSDs use a great many ports during periods of high traffic. It is, therefore, recommended that you increase the number of open file handles available to Docker.

On CoreOS (and probably other systemd-based systems), you can do this by creating the a file named /etc/systemd/system/docker.service.d/limits.conf with content something like:

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