Install Proxmox VE on Debian Stretch

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Introduction

The installation of a supported Proxmox VE server should be done via Bare-metal_ISO_Installer. In some case it makes sense to install Proxmox VE on top of a running Debian Stretch 64-bit, especially if you want a custom partition layout. For this HowTO the following Debian Stretch ISO was used: [1].

Install a standard Debian Stretch (amd64)

Install a standard Debian Stretch, for details see Debian, and select a fixed IP. It is recommended to only install the "standard" package selection and nothing else, as Proxmox VE brings its own packages for qemu, lxc.

Add an /etc/hosts entry for your IP address

Please make sure that your hostname is resolvable via /etc/hosts, i.e you need an entry in /etc/hosts which assigns an IPv4 address to that hostname.

Note: Make sure that no IPv6 address for your hostname is specified in `/etc/hosts`

For instance if your IP address is 192.168.15.77, and your hostname prox4m1, then your /etc/hosts file shoud look like: 

127.0.0.1       localhost.localdomain localhost
192.168.15.77   prox4m1.proxmox.com prox4m1 pvelocalhost

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

You can test if your setup is ok using the hostname command: 

hostname --ip-address
192.168.15.77 # should return here your IP adress

Install Proxmox VE

Adapt your sources.list

Add the Proxmox VE repository: 

echo "deb http://download.proxmox.com/debian/pve stretch pve-no-subscription" > /etc/apt/sources.list.d/pve-install-repo.list

Add the Proxmox VE repository key: 

wget http://download.proxmox.com/debian/proxmox-ve-release-5.x.gpg -O /etc/apt/trusted.gpg.d/proxmox-ve-release-5.x.gpg

Update your repository and system by running: 

apt update && apt dist-upgrade

NOTE: If you have enabled other another arch (typically, i386 to run some older software) and apt complains about not being able to find /binary-i386: "Unable to find expected entry 'pve/binary-i386/Packages'" you need to remove other arch or use instead the row: 

deb [arch=amd64] http://download.proxmox.com/debian/pve stretch pve-no-subscription

this is because Proxmox repository does not have any other arch besides amd64; more info on multiarch on debian on: https://wiki.debian.org/Multiarch/HOWTO.

Install Proxmox VE packages

Install the Proxmox VE packages 

apt install proxmox-ve postfix open-iscsi

Accept the suggestion to remove Exim and configure postfix according to your network. If you have a mail server in your network, you should configure postfix as a satellite system, and your existing mail server will be the 'relay host' which will route the emails send by the proxmox server to the end recipient. If you don't know what to enter here, choose local only.

Finally, reboot your system, the new Proxmox VE kernel should be automatically selected in the GRUB menu.

Recommended: remove the os-prober package

The os-prober package scans all the partitions of your host including those of you guests VMs to create dual-boot GRUB entries. If you didn't install Proxmox VE as a dual boot besides another Operating System you can safely remove the os-prober package. 

apt remove os-prober

Connect to the Proxmox VE web interface

Connect to the admin web interface (https://youripaddress:8006). If you have a fresh install and didn't add any users yet, you should use the root account with your linux root password, and select "PAM Authentication" to log in.

Once logged in, create a Linux Bridge called vmbr0, and add your first network interface to it.

Adapt vmbr0 settings

Configure apt to use the new packages repositories

In order to get latest updates, you need to add one of the new package repositories, see Package repositories

Troubleshooting

resolv.conf gets overwritten

The PVE GUI expects to control DNS management and will no longer take its DNS settings from /etc/network/interfaces Any package that auto-generates (overwrites) /etc/resolv.conf will cause DNS to fail. e.g. packages 'resolvconf' for IPv4 and 'rdnssd' for IPv6.

Optional Steps

Optional: Remove the Debian kernel

apt remove linux-image-amd64 linux-image-4.9.0-2-amd64

Check grub2 config by running: 

update-grub
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