entrypoint.sh

#!/bin/bash
set -e

# Expected environment variables:
#   MON_IP - (IP address of monitor)
#   MON_NAME - (name of monitor)
# Usage:
#   docker run -e MON_IP=192.168.101.50 -e MON_NAME=mymon ceph/mon

if [ ! -n "$MON_NAME" ]; then
   echo "ERROR- MON_NAME must be defined as the name of the monitor"
   exit 1
fi

if [ ! -n "$MON_IP" ]; then
   echo "ERROR- MON_IP must be defined as the IP address of the monitor"
   exit 1
fi

if [ ! -e /etc/ceph/ceph.conf ]; then
   ### Bootstrap the ceph cluster

   fsid=$(uuidgen)
   cat <<ENDHERE >/etc/ceph/ceph.conf
fsid = $fsid
mon initial members = ${MON_NAME}
mon host = ${MON_IP}
auth cluster required = cephx
auth service required = cephx
auth client required = cephx
ENDHERE

   # Generate administrator key
   ceph-authtool /etc/ceph/ceph.client.admin.keyring --create-keyring --gen-key -n client.admin --set-uid=0 --cap mon 'allow *' --cap osd 'allow *' --cap mds 'allow'

   # Generate the mon. key
   ceph-authtool /etc/ceph/ceph.mon.keyring --create-keyring --gen-key -n mon. --cap mon 'allow *'

   # Generate initial monitor map
   monmaptool --create --add ${MON_NAME} ${MON_IP} --fsid ${fsid} /etc/ceph/monmap
fi

# If we don't have a monitor keyring, this is a new monitor
if [ ! -e /var/lib/ceph/mon/ceph-${MON_NAME}/keyring ]; then

   if [ ! -e /etc/ceph/ceph.client.admin.keyring ]; then
      echo "ERROR- /etc/ceph/ceph.client.admin.keyring must exist; get it from your existing mon"
      exit 2
   fi

   if [ ! -e /etc/ceph/ceph.mon.keyring ]; then
      echo "ERROR- /etc/ceph/ceph.mon.keyring must exist.  You can extract it from your current monitor by running 'ceph auth get mon. -o /tmp/ceph.mon.keyring'"
      exit 3
   fi

   if [ ! -e /etc/ceph/monmap ]; then
      echo "ERROR- /etc/ceph/monmap must exist.  You can extract it from your current monitor by running 'ceph mon getmap -o /tmp/monmap'"
      exit 4
   fi

   # Import the client.admin keyring and the monitor keyring into a new, temporary one
   ceph-authtool /tmp/ceph.mon.keyring --create-keyring --import-keyring /etc/ceph/ceph.client.admin.keyring
   ceph-authtool /tmp/ceph.mon.keyring --import-keyring /etc/ceph/ceph.mon.keyring

   # Make the monitor directory
   mkdir -p /var/lib/ceph/mon/ceph-${MON_NAME}

   # Prepare the monitor daemon's directory with the map and keyring
   ceph-mon --mkfs -i ${MON_NAME} --monmap /etc/ceph/monmap --keyring /tmp/ceph.mon.keyring

   # Clean up the temporary key
   rm /tmp/ceph.mon.keyring
fi

exec /usr/bin/ceph-mon -d -i ${MON_NAME} --public-addr ${MON_IP}:6789