Networking Start Failed on OVH Proxmox 6.4 – Bridge Interface Issue

bridgedebianovhproxmox

We are setting up a new Proxmox 6.4 (based on Debian 10.9) host on OVH (Advance-2) hardware, using the OVH provided template.

In order to create a "virtual" bridge for VMs and LXCs, we added these lines into /etc/network/interfaces :

auto vmbr1
iface vmbr1 inet static
        address 10.0.1.254/24
        bridge-ports none
        bridge-stp off
        bridge-fd 0

This configuration works fine on all our Proxmox hosts, but fails on the new machine: reboot takes 20 minutes on "Starting Raise network interfaces", fails with "Failed to start Raise network interfaces" and the bridge interface is not up.

After rebooting without the vmbr1 stuff, I could see that systemctl restart networking hangs on "Starting to wait for vmbr1 link to be up"

May 12 10:01:49 pve7 ifup[7300]: Waiting for vmbr1 to get ready (MAXWAIT is 2 seconds).
May 12 10:01:49 pve7 ifup[7300]: Disabling IPv6 autoconfiguration for vmbr1
May 12 10:01:49 pve7 ifup[7300]: net.ipv6.conf.vmbr1.accept_ra = 0
May 12 10:01:49 pve7 ifup[7300]: net.ipv6.conf.vmbr1.accept_dad = 0
May 12 10:01:49 pve7 ifup[7300]: net.ipv6.conf.vmbr1.autoconf = 0
May 12 10:01:49 pve7 ifup[7300]: Starting to wait for vmbr1 link to be up at Wed May 12 10:01:49 UTC 2021

Best Answer

The problem comes from /etc/network/if-pre-up.d/wait_for_link_up, which will wait forever on vmbr1. It looks like this script was recently added by OVH on their Proxmox template, as it does not exist on our older hosts...

Anyway, for now, I fixed the problem by excluding the vmbr1 interface with:

if [ "x${IFACE}" = "xvmbr1" ]; then
        exit
fi
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