Revision as of 20:51, 14 September 2021 by Tony (talk | contribs)








Directory structure








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?







Show cluster status

pvecm status

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

On the third/quorum node

And "Quorum: 2 Activity blocked"

In my case this meant boot up second real node

Check corosync-cmapctl ?

also see


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


Check if qemu agent is running

See if IP is shown under Summary, also

qm agent 105 ping

Stop all proxmox services

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


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 :)





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

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

"connection error - server offline?"

Try reconnection browser


Find vm name by id

grep name /etc/pve/nodes/*/qemu-server/101.conf |head -n 1


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 :)