Proxmox - Install ceph after the fact

Brian

24 Oct 2025 • 1 min read

Stole from https://forum.proxmox.com/threads/ceph-osd-on-lvm-logical-volume.68618/

1. During install set maxvz to 0 to not create local storage and keep free space for Ceph on the OS drive. [GUIDE, 2.3.1 Advanced LVM Configuration Options ]
2. Setup Proxmox like usual and create a cluster
3. Install Ceph packages and do initial setup (network interfaces etc.) via GUI, also create Managers and Monitors
4. To create OSDs open a shell on each node and

4.a. bootstrap auth [4]:
ceph auth get client.bootstrap-osd > /var/lib/ceph/bootstrap-osd/ceph.keyring

4.b. Create new logical volume with the remaining free space:
lvcreate -l 100%FREE -n pve/vz

4.c. Create (= prepare and activate) the logical volume for OSD [2] [3]
ceph-volume lvm create --data pve/vz