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Install Proxmox on Hetzner and OVH Dedicated Server with QEMU

• Install Proxmox on Hetzner Dedicated Server with QEMU
  • Prepare the rescue from hetzner robot manager
    • Install requirements and Install Proxmox
    • Useful network configs
    • Post Install
    • Login to Web GUI
      • Special Thanks

Prepare the rescue from hetzner robot manager

• Select the Rescue tab for the specific server, via the hetzner robot manager
• • Operating system=Linux
• • Architecture=64 bit
• • Public key=optional
• --> Activate rescue system
• Select the Reset tab for the specific server,
• Check: Execute an automatic hardware reset
• --> Send
• Wait a few mins
• Connect via ssh/terminal to the rescue system running on your server

Install requirements and Install Proxmox

wget https://github.com/WMP/proxmox-hetzner/raw/main/install-proxmox.sh
bash install-proxmox.sh --help

• Install Proxmox and attention to these :
  • choose zfs partition type
  • choose lz4 in compress type of advanced partitioning
  • do not add real IP info in network configuration part (just leave defaults!)
  • close VNC window after system rebooted and waits for reconnect

After installer reboots QEMU, the script will automaticaly configure network vmbr0 for a bridged network. It will also run the Post Install Script

If you enable ACME make sure to pass an email with -e, --acme-email EMAIL

• Reboot main rescue ssh:

reboot

• After a few minutes, login again to your proxmox server with ssh on port 22 or the port you gave the install script.
• Make sure to change the hostname file to reflect your public ip from hetzner.

Automated Installation (Proxmox 9+)

For a fully unattended installation without VNC interaction, use the --automated-install flag:

bash install-proxmox.sh --automated-install --proxmox-version 9 \
   --pve-fqdn pve.example.com \
   --pve-email admin@example.com \
   --pve-root-password SecurePass123 \
   --pve-filesystem zfs --pve-zfs-raid raid1 \
   --pve-disk-list sda,sdb --yes

This uses the Proxmox auto-install-assistant to generate an answer file and create a custom ISO. VNC is available for optional monitoring during installation.

Tested on:

• Proxmox VE 9.1 on OVH Advanced-1

Useful network configs

• For private subnet append these lines to interface file :

auto vmbr1
iface vmbr1 inet static
    address 192.168.20.1/24
    bridge-ports none
    bridge-stp off
    bridge-fd 0
    post-up   iptables -t nat -A POSTROUTING -s '192.168.20.0/24' -o vmbr0 -j MASQUERADE
    post-down iptables -t nat -D POSTROUTING -s '192.168.20.0/24' -o vmbr0 -j MASQUERADE
    post-up   iptables -t raw -I PREROUTING -i fwbr+ -j CT --zone 1
    post-down iptables -t raw -D PREROUTING -i fwbr+ -j CT --zone 1

• For public subnet append these lines to interface file (first-Usable-IP/subnet)

auto vmbr2
iface vmbr2 inet static
    address first-Usable-IP/subnet
    address first-Usable-IP/subnet
    bridge-ports none
    bridge-stp off
    bridge-fd 0

• For vlan support append these lines to interface file :
  • You have to create a vswitch with ID 4000 in your robot panel of hetzner.

auto vlan4000
iface vlan4000 inet static
    address 10.0.1.5/24
    mtu 1400
    vlan-raw-device vmbr0
    up ip route add 10.0.0.0/16 via 10.0.1.1 dev vlan4000
    down ip route del 10.0.0.0/16 via 10.0.1.1 dev vlan4000

Post Install

• Limit ZFS Memory Usage According to This Link

echo "options zfs zfs_arc_min=$[6 * 1024*1024*1024]" >> /etc/modprobe.d/99-zfs.conf
echo "options zfs zfs_arc_max=$[12 * 1024*1024*1024]" >> /etc/modprobe.d/99-zfs.conf
update-initramfs -u

Login to Web GUI

https://IP_ADDRESS:8006/

Special Thanks

Ariadata Tteck