Proxmox-VirtioFS

README.md

Proxmox-VirtioFS

Goal

Create a shared file system between host and VM programmatically without network

Script Results

• Starts and stops the virtiofsd daemon on socket automatically (pre-start vm)
• Args added to each vm conf automatically
• Creates custom shared folder with folder structure "vmname (vmid)"

Snippet add

qm set <vm number> -hookscript local:snippets/virtiofs.pl

Check / Kill Processes

ps aux | grep virtiofsd killall virtiofsd

File Locations

/var/lib/vz/snippets/launch-virtio-daemon.sh /var/lib/vz/snippets/virtiofs.pl /etc/pve/nodes/pve/qemu-server/<vm number>.conf

Resources

• https://forum.proxmox.com/threads/virtiofs-support.77889/?msclkid=17672713af0111ecb5a67cd8310ebff7 (General discussion)
• virtio-win/kvm-guest-drivers-windows#527 (comment) (Queue length fix - Large file crashing in Win)

launch-virtio-daemon.sh

#!/usr/bin/bash

vmid=$1

matchword="name: "
match="$(qm config $vmid | grep $matchword)"
vmname="${match/$matchword/}"

matchword="memory: "
match="$(qm config $vmid | grep $matchword)"
vmmemory="${match/$matchword/}"

sharepath="/mnt/share/$vmname (vm$vmid)"
socketpath="/var/run/vm$vmid-vhost-fs.sock"

vmconfpath="/etc/pve/nodes/pve/qemu-server"
vmconf="$vmconfpath/$vmid.conf"
vmconftemp="$vmconf.tmp"

if [ -a "$vmconf" ]
then
        grep -v "args: -chardev socket,id=char0,path=/var/run/vm" $vmconf > $vmconftemp
        mv $vmconftemp $vmconf
        echo "args: -chardev socket,id=char0,path=/var/run/vm"$vmid"-vhost-fs.sock -device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=vmshare -object memory-backend-memfd,id=mem,size="$vmmemory"M,share=on -numa node,memdev=mem" >> $vmconf
fi

if [ ! -d "$sharepath" ]
then
        mkdir "$sharepath"
fi

sleep 3

nohup /usr/lib/kvm/virtiofsd --syslog --daemonize --socket-path="$socketpath" -o source="$sharepath" -o cache=always &> /dev/null  &

virtio.pl

#!/usr/bin/perl

use strict;
use warnings;

print "GUEST HOOK: " . join(' ', @ARGV). "\n";

# First argument is the vmid
# Second argument is the phase
my $vmid = shift;
my $phase = shift;

if ($phase eq 'pre-start') {
    print "$vmid is starting, doing preparations.\n";
    system("/var/lib/vz/snippets/launch-virtio-daemon.sh", "$vmid");
} elsif ($phase eq 'post-start') {
    print "$vmid started successfully.\n";
} elsif ($phase eq 'pre-stop') {
    print "$vmid will be stopped.\n";
} elsif ($phase eq 'post-stop') {
    print "$vmid stopped. Doing cleanup.\n";
} else {
    die "got unknown phase '$phase'\n";
}

exit(0);