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Proxmox

Move disks to new storage

for vmid in {102..120};do qm move-disk $vmid scsi0 local-zfs --delete;done

Managing the summer-winter heat/consume

Move VM to same node

Move to local storage

See Move disks to new storage

Remove Ceph

1 Remove/Delete Ceph

Warning: Removing/Deleting ceph will remove/delete all data stored on ceph as well!

1.1 Login to Proxmox Web GUI

1.2 Click on one of the PVE nodes

1.3 From right hand side panel, Navigate to Ceph -> Pools record items under Name

1.4 Navigate to Ceph -> CephFS, record existing cephFS names

1.5 From left hand side menu, Click on Datacenter

1.6 From right hand side, Click on Storage

1.7 Delete all items which we saw under CephFS and Pools from step 3 and step 4

1.8 From right hand side panel, Click on master node, Navigate to Ceph -> CephFS, Stop and Destroy all Metadata Services

1.9 Click on master node, from right hand side panel, Navigate to Ceph -> OSD, Mark all OSDs as Out

1.10 From right hand side menu, Right Click on one of the PVE nodes’ name, Click on >_ Shell to open terminal

1.11 Mark OSD down

ceph osd down <osdid>
# e.g.
ceph osd down 0
ceph osd down 1
ceph osd down 2

1.12 Click on master node, from right hand side panel, Navigate to Ceph -> OSD, Click on the OSD to be removed, Click on More button from top right corner, Click on Destroy

or

We can mark them down and destroy in one command

ceph osd down 0 && ceph osd destroy 0 --force
ceph osd down 1 && ceph osd destroy 1 --force
ceph osd down 2 && ceph osd destroy 2 --force

1.13 Remove ceph configuration file by executing the following command from terminal (Refer to step 10)

rm /etc/ceph/ceph.conf

1.14 On each of the PVE node, execute the following command to stop ceph monitor service

systemctl stop ceph-mon@<hostname or monid>
# e.g.
systemctl stop ceph-mon@labnode1

Note: If unsure what should be the hostname or monid to use after @, we can type the command “ systemctl stop ceph-mon@ ” then Press Tab key once, the correct value will be appended for us, remember to note down the appended value, we will need this value for next step (step 15)

1.15 Disable the ceph monitor service, execute the following command on each nodes

systemctl disable ceph-mon@<hostname or monid>
# e.g.
systemctl disable ceph-mon@labnode1

Note: Append the value we got from step 14 after “ @ “

If we see something similar to below, it means we have successfully executed the correct command

Removed /etc/systemd/system/ceph-mon.target.wants/ceph-mon@labnode1.service.

1.16 Remove ceph configuration file from all nodes

rm -r /etc/pve/ceph.conf
rm -r /etc/ceph
rm -rf /var/lib/ceph

If we get the following error or similar

rm: cannot remove '/var/lib/ceph/osd/ceph-0': Device or resource busy

We can use this command to unmonut first then, try to remove it again

umount /var/lib/ceph/osd/ceph-0
rm -r /var/lib/ceph

1.17 Reboot all PVE nodes

1.18 Clear leftover ceph configuration files and services, execute the following command on each nodes

pveceph purge

1.20 Clear the OSD disks from each OSD nodes, so that we can use those disks later

# Remove the lvm signature from the disk
# Note: Change the drive letter (sdx) accordingly
fdisk /dev/sdx

Then Enter d , Press Enter key, Enter w , Press Enter key

rm -r /dev/ceph-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx

Note: To find the correct value, we can use this command “ ls /dev | grep ceph ” or just type “ rm -r /dev/ceph- ” then Press Tab key to auto complete the rest

# Restart the PVE host
reboot

1.21 Remove all ceph packages if desired

apt purge ceph-mon ceph-osd ceph-mgr ceph-mds

More to remove if desired

apt purge ceph-base ceph-mgr-modules-core

2 Reinstall Ceph

The reinstallation procedure is almost identical with new/fresh ceph installation (really easy when using PVE web gui), however, if we have encountered the following error during creation of OSD, due to leftover from previous installation

error during cfs-locked 'file-ceph_conf' operation: command 'cp /etc/pve/priv/ceph.client.admin.keyring /etc/ceph/ceph.client.admin.keyring' failed: exit code 1 (500)

or

unable to open file '/var/lib/ceph/bootstrap-osd/ceph.keyring.tmp.1694' - No such file or directory (500)

or

unable to open file '/var/lib/ceph/bootstrap-osd/ceph.keyring.tmp.920' - No such file or directory (500)

To fix this issue, we can use the following method (Create the missing directory, “ /var/lib/ceph/bootstrap-osd/ “)

mkdir /var/lib/ceph/bootstrap-osd

From 3 to 1 nodes

On all nodes:

systemctl stop pve-cluster
systemctl stop corosync

Start the cluster filesystem again in local mode:

pmxcfs -l

Delete the corosync configuration files:

rm /etc/pve/corosync.conf
rm /etc/corosync/*

You can now start the filesystem again as normal service:

killall pmxcfs
systemctl start pve-cluster

Stop the nodes.