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function bootstrap_osd {
  if [[ -n "$OSD_DEVICE" ]]; then
    if [[ -b "$OSD_DEVICE" ]]; then
      if [ -n "$BLUESTORE_BLOCK_SIZE" ]; then
        size=$(parse_size "$BLUESTORE_BLOCK_SIZE")
        if ! grep -qE "bluestore_block_size = $size" /etc/ceph/"${CLUSTER}".conf; then
          echo "bluestore_block_size = $size" >> /etc/ceph/"${CLUSTER}".conf
        fi
      fi
    else
      log "Invalid $OSD_DEVICE, only block device is supported"
      exit 1
    fi
  fi

  if [ ! -e "$OSD_PATH"/keyring ]; then
    if ! grep -qE "osd data = $OSD_PATH" /etc/ceph/"${CLUSTER}".conf; then
      echo "osd data = $OSD_PATH" >> /etc/ceph/"${CLUSTER}".conf
      echo "osd objectstore = bluestore" >> /etc/ceph/"${CLUSTER}".conf
    fi

    # bootstrap OSD
    mkdir -p "$OSD_PATH"
    chown --verbose -R ceph. "$OSD_PATH"

    # if $OSD_DEVICE exists we deploy with ceph-volume
    if [[ -n "$OSD_DEVICE" ]]; then
      ceph-volume lvm prepare --data "$OSD_DEVICE"
    else
      # we go for a 'manual' bootstrap
      ceph "${CLI_OPTS[@]}" auth get-or-create osd."$OSD_ID" mon 'allow profile osd' osd 'allow *' mgr 'allow profile osd' -o "$OSD_PATH"/keyring
      ceph-osd --conf /etc/ceph/"${CLUSTER}".conf --osd-data "$OSD_PATH" --mkfs -i "$OSD_ID"
    fi
  fi

  # activate OSD
  if [[ -n "$OSD_DEVICE" ]]; then
    OSD_FSID="$(ceph-volume lvm list --format json | python -c "import sys, json; print(json.load(sys.stdin)[\"$OSD_ID\"][0][\"tags\"][\"ceph.osd_fsid\"])")"
    ceph-volume lvm activate --no-systemd --bluestore "${OSD_ID}" "${OSD_FSID}"
  fi

ceph        40  0.5  0.1 571984 125820 ?       Ssl  13:52   1:06 ceph-mon --setuser ceph --setgroup ceph -i ceph-nano-coree-faa32aebf00b --mon-data /var/lib/ceph/mon/ceph-ceph-nano-coree-faa32aebf00b --public-addr 127.0.0.1:3300
ceph       144  0.7  0.2 753936 149424 ?       Ssl  13:52   1:23 ceph-mgr --setuser ceph --setgroup -i ceph-nano-coree-faa32aebf00b
ceph       349  0.3  0.1 850272 69172 ?        Ssl  13:52   0:38 ceph-osd --setuser ceph --setgroup -i 0