Re-creates external journals for Ceph OSDs

create-external-journal.sh

#!/bin/bash

stop ceph-osd-all

part_num=0
journal_disk=/dev/vdb
jsize=512M
osds="1 2"

for i in $osds
do
    ceph-osd -i $i --flush-journal
done

sgdisk --zap-all $journal_disk
parted $journal_disk mklabel gpt

for i in $osds
do
    echo "Creating journal partition for ceph-$i"
    part_num=$(($part_num + 1))
    if [ ! -f /var/lib/ceph/osd/ceph-$i/journal_uuid ]; then
        echo "generating new uuid at /var/lib/ceph/osd/ceph-$i/journal_uuid"
        uuidgen > /var/lib/ceph/osd/ceph-$i/journal_uuid
    fi
    journal_uuid=$(cat /var/lib/ceph/osd/ceph-$i/journal_uuid)
    echo "journal_uuid=$journal_uuid"
    sgdisk --new=$part_num:0:+$jsize --change-name=$part_num:'ceph journal' --partition-guid=$part_num:$journal_uuid --typecode=0:$journal_uuid --mbrtogpt -- $journal_disk

    # Use the updated partition id
    ln -sf /dev/disk/by-partuuid/$journal_uuid /var/lib/ceph/osd/ceph-$i/journal
    sleep 5
    ceph-osd -i $i --mkjournal
    start ceph-osd id=$i
done