Proxmox

Is a Supervisor Operating System

Links

• Proxmox Documentation
• Proxmox Wiki
• Home Assistant custom integration

Setup

• In VirtualBox: see the guide
• Trove of scripts
  • Post-install script
  • Change CPU Scaling Governor to powersave to save some previous Watts
  • Clean old kernels
• SSH port shouldn't be changed as it is used for cluster things
  • Setup Cloudflare DNS with Proxmox: Guide

Activate IOMMU / PCIe Passthrough

• See this Wiki page and this documentation page
• Add intel_iommu=on or amd_iommu=on to the GRUB or systemd-boot (in UEFI)
  • IOMMU Passthrough can also be added if supported with iommu=pt
• Edit /etc/modules and add vfio vfio_iommu_type1 vfio_pci vfio_virqfd
• update-initramfs -u -k all
• Reboot
• Check if active with PCI Express
• Check IOMMU groups with PCI Express

Import a VM from TrueNAS

• Disk copy
  • Copy the raw file from TrueNAS to Proxmox - ZFS with dd
  • Import the raw file with qm importdisk <VMID> /path/to/file.raw local --format qcow2
  • Attach the disk to the VM with VirtIO
• Other settings from TrueNAS
  • Boot loader: UEFI
  • Display: SPICE

USB Passthrough

• The order of creation of passthrough does matter, like for Home Assistant

Remote SPICE access without going through Web GUI

• Set up permissions
  • New role with VM.Console, VM.Audit
  • New group
  • New permission for the group with the role and the necessary path
  • New user in the PVE realm assigned to the group
• Set up token
  • Create API Token, with Privilege Separation
  • In each VM, assign the API token to the Role created
• Choose a script option
  • cv4pve-pepper
    • API Access:
  • Linux only script: PVE Spice Connect

Configure ZFS settings

Limit ZFS Memory usage

• See Wiki

Serial Console

• Add Serial device to the VM
• Edit /etc/default/grub with

GRUB_CMDLINE_LINUX="console=ttyS0,115200n8"
GRUB_TERMINAL=serial
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"

• Run update-grub

Create a QEMU CPU Model

• Stored in /etc/pve/virtual-guest/cpu-models.conf
• See Documentation

Disable mitigations

• Edit /etc/default/grub
  • In GRUB_CMDLINE_LINUX_DEFAULT, add mitigations=off
• update-grub
• reboot

Utilization

• See QEMU

Stop a VM

• Shutdown simulate an ACPI power off
• Stop simulate a sudden stops, like a power loss
• qm stop <VMID> with VMID the ID in Proxmox
• ps aux | grep <VMID> to grab the VM's process ID
• kill -9 <PID> to kill the process

Mount a USB drive

• Mount the drive with fstab
• In the Proxmox interface, add the disk as a Directory

Shrink a VM Disk

• Make sure that things are zeroed
  • Make sure that Discard is on
  • Resize a partition
• Change the size (source)
  • If LV: lvreduce -L 5G /dev/pve/disk-name (reduce to 5G) or lvreduce -L -5G /dev/pve/disk-name (reduce by 5G)
  • If qcow2: qemu-img resize --shrink <vmfile.qcow2> [+-] or size
  • If ZFS: zfs set volsize=<new size>G rpool/data/vm-<vm id>-disk-<disk number>
    • Find the ZFS path with zfs list
• Update Proxmox: qm rescan
• If you use GUID Partition Table

Backup to USB External Drive

• Have an existing ext4 partition
  • Or create it, check fstab
• Create a folder and mount /dev/sdba1 /mnt/folder
• Add the folder in Datacenter, Storage → Add Directory

Mail managements

See postfix

Sources

• Before I do anything on Proxmox, I do this first... - YouTube