Revision as of 10:40, 24 March 2022 by Tony (talk | contribs) (→‎FAQ)








qm Qemu Manager

pvesm Storage manager


pvesm scan 




pvesh get /cluster/resources
pvesh get /cluster/resources --output-format json-pretty


Proxmox API

Directory structure



The VM configs

vmstate? sems related to snapshots





Proxmox cluster

Cluster manager

pvecm status
pvecm nodes


HA status

ha-manager status

Monitoring proxmox with zabbix


Proxmox API call failed: Couldn't authenticate user: zabbix@pve

Funky characters in password string?


Failed to establish a new connection: [Errno -2] Name or service not known

Just that, check your DNS





Show cluster status

pvecm status

It seems relatively safe to restart corosync

corosync-qdevice[11695]: Can't read quorum.device.model cmap key

On the qdevice node

Check corosync-cmapctl ?

also see

"Quorum: 2 Activity blocked"

In my case this meant boot up second real node first



On working node:

corosync-cmapctl | grep quorum.device
quorum.device.model (str) = net (str) = ffsplit (str) = (str) = on
quorum.device.votes (u32) = 1





Shutting down a node

Should just work. Takes guests down with it when they're not in HA

Cores, sockets and vCPUs

vCPUs is what the vm uses, equals sockets*cores




VM is locked (create) (500)

Not always clear why, but try

qm unlock 111





missing replicate feature on volume 'local-lvm

looks like replication of lvm isn't supported

Check if qemu agent is running

See if IP is shown under Summary, also

qm agent 105 ping

Move to unused disk

If you moved disk, and decided to move back to the old one:

  • detach current disk
  • select the unused disk
  • click Add

Stop all proxmox services

systemctl stop pve-cluster systemctl stop pvedaemon systemctl stop pveproxy systemctl stop pvestatd

Storage (xx) not available on selected target

probably some storage mounted only on one node, so not clustered


switch to community repository

cat /etc/apt/sources.list.d/pve-enterprise.list 
#deb buster pve-enterprise
echo "deb buster pve-no-subscription" > /etc/apt/sources.list.d/pve-no-subscription.list 
apt update

W: (pve-apt-hook) You are attempting to remove the meta-package 'proxmox-ve'!

cehck sources.list :)



Add local disk or LV to vm

That would be passtrough

qm set 101 -scsi1 /dev/mapper/somevolume

Make sure node node can't migrate: ?? PVE won't try that anyway, but still



PBS GC & Prune scheduling

qmp command 'backup' failed - got timeout



export PBS_REPOSITORY="backup@pbs@pbs-server:backuprepo"
proxmox-backup-client snapshot list
proxmox-backup-client prune vm/101 --dry-run --keep-daily 7 --keep-weekly 3
proxmox-backup-client garbage-collect

dirty-bitmap status: existing bitmap was invalid and has been cleared


unexpected property 'prune-backups' (500)

When for example Add: iSCSI Uncheck "Keep all backups" in "Backup retention"


FAILED 00:00:02 unable to activate storage



VM 101 Backup failed: VM is locked (snapshot)

Check if there's no snapshot running (how?)

qm unlock 101

can't acquire lock '/var/run/vzdump.lock' - got timeout

Check if vzdump is running, otherwise kill it (cluster?)


VM 101 Backup failed::= VM is locked (snapshot-delete)

Check /etc/pve/qemu-server/101.conf for 'snapstate'

If that says 'delete' for a snapshot try deleting the snapshot:

qm delsnapshot 101 snapname

If that throws like Failed to find logical volume 'pve/snap_vm-101-disk-0_saving'

 qm delsnapshot 101 snapname --force

to get it out of 101.conf


qmp command 'query-backup' failed - got wrong command id

Restoring single file from (PBS) backup

Check Mounting of archives with fuse

Requires package proxmox-backup-file-restore:


Error: VM quit/powerdown failed - got timeout

qm stop VMID

if that complains about lock, remove the lock and try again


a used vhost backend has no free memory slots left

You have not turned on protection against thin pools running out of space.

serial console from command line

qm terminal <id}

enable serial console in guest

looks like this is not needed:

systemctl enable serial-getty@ttyS0.service

in /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="console=ttyS0 console=tty0"

ttyS0 is for qm terminal, tty0 is for the "console" buttion in UI

  1. debian based


  1. redhat based

grub2-mkconfig --output=/boot/grub2/grub.cfg



serial0: socket

to /etc/pve/qemu-server/[vmid].conf and restart


agetty: /dev/ttyS0: not a device

systemctl status useless again, means the serial bit is missing from <vmid>.conf

TASK ERROR: command 'apt-get update' failed: exit code 100

subtle way of telling you to get subscription of at least change the sources list

Import vmdk to lvm

Can't apply changes to memory allocation

Maybe try enabling NUMA in CPU settings



Adding hardware shows orange

something is not supported (Options->Hotplug)

"Connection error 401: no ticket"

Login session expired?

can't lock file '/var/lock/qemu-server/lock-102.conf' - got timeout (500)

Maybe someone else has/had webui open

== TASK ERROR: Can't use string ("keep-all=0,keep-last=3") as a HASH ref while "strict refs" in use at /usr/share/perl5/PVE/ line 502. ==

Classic, means incorrect syntax in your /etc/pve/storage.cfg


The current guest configuration does not support taking new snapshots

You're using raw instead of qcow2. Convert: Hardware->Hard disk "Move Disk"



WARNING: Device /dev/dm-21 not initialized in udev database even after waiting 10000000 microseconds.

Until someone fixes it:

udevadm trigger

Also look for link to dm-21 in /dev/disk/by-id

"connection error - server offline?"

Try reconnection browser



Find vm name by id

grep name: /etc/pve/nodes/*/qemu-server/101.conf |head -n 1 | cut -d ' ' -f 2

Started Proxmox VE replication runner.


Find ID by name

grep -l "name: <NAME>"  /etc/pve/nodes/*/qemu-server/*conf| sed 's/^.*\/\([0-9]*\)\.conf/\1/g'


Can't migrate VM with local CD/DVD

Remove the CD :)



Memory allocated to VMs

qm list|egrep -v "VM|stopped" | awk '{ sum+=$4 } END { print sum }'


Got timeout(500)


pveceph status

Possibly problem with ceph mgr


Guest issues

virtio_balloon virtio0: Out of puff! Can't get 1 pages