No network after pve6 to pve7 upgrade

[AlexandreGoethals]

Hello,

I recently upgraded my pve 6 server (dedicated server RISE-1 at OVH), following this guide: https://pve.proxmox.com/wiki/Upgrade_from_6.x_to_7.0#Check_Linux_Network_Bridge_MAC
The upgrade went fine, but after a reboot, the server did not answer to ping, SSH, HTTP, etc.

pve6to7 utility showed no errors.
As my system already used ifupdown2, as mentioned by the guide, I did not write the MAC addresses in the /etc/network/interfaces (but I wrote them down somewhere, just in case).

Here is the /etc/network/interfaces file prior to the upgrade:

auto lo
iface lo inet loopback

iface eno1 inet manual

iface eno2 inet manual

auto vmbr0     # this interface is used by some CTs and VMs which have a public IP
iface vmbr0 inet dhcp
        bridge-ports eno1
        bridge-stp off
        bridge-fd 0

auto vmbr1     # this interface is used by all CTs and VMs
iface vmbr1 inet static
        address 10.0.0.1/24
        gateway X.X.X.X
        bridge-ports none
        bridge-stp off
        bridge-fd 0

After a reboot, and failure to get any network, I chrooted with a live distro and modified the file:

auto lo
iface lo inet loopback

iface eno1 inet manual
        hwaddress a4:bf:01:2d:ad:68

iface eno2 inet manual
        hwaddress a4:bf:01:2d:ad:69

auto vmbr0
iface vmbr0 inet dhcp
        hwaddress a4:bf:01:2d:ad:68
        bridge-ports eno1
        bridge-stp off
        bridge-fd 0

auto vmbr1
iface vmbr1 inet static
        address 10.0.0.1/24
        hwaddress ba:45:8b:04:c0:80
        gateway X.X.X.X
        bridge-ports none
        bridge-stp off
        bridge-fd 0

I retrieved MAC addresses using ip -c link. After another reboot: no success.

syslog showed this error:

Oct  7 17:39:39 prox-01 networking[915]: error: vmbr0 : eno1 : (eno1: pre-up cmd '/etc/network/if-pre-up.d/static_ipv6' failed: returned 255 (Disabling IPv6 autoconfiguration for eno1
Oct  7 17:39:39 prox-01 networking[915]: sysctl: cannot stat /proc/sys/net/ipv6/conf/eno1/accept_ra: No such file or directory
Oct  7 17:39:39 prox-01 networking[915]: sysctl: cannot stat /proc/sys/net/ipv6/conf/eno1/accept_dad: No such file or directory
Oct  7 17:39:39 prox-01 networking[915]: sysctl: cannot stat /proc/sys/net/ipv6/conf/eno1/autoconf: No such file or directory
Oct  7 17:39:39 prox-01 networking[915]: ))
Oct  7 17:39:39 prox-01 networking[915]: warning: vmbr0: interface not recognized - please check interface configuration

So I chrooted again and commented out vmbr0 description in /etc/network/interfaces, then rebooted.
Now the only network related errors I see in the syslog are:

/bin/mv: cannot stat '/etc/network/interfaces.new': No such file or directory

and other expected errors complaining that the system can not reach Debian NTP pools and my proxmox backup server, but I still cannot connect to my server.

I would gladly provide any other information needed, and try any workaround

 

[djsami]

I have the same problem and unfortunately there is no solution.

 

[aghadjip]

i had a similar issue, i had to add auto to my interfaces like so

auto lo
iface lo inet loopback

auto eno1
iface eno1 inet manual
    mtu 9000

auto eno2
iface eno2 inet manual
    mtu 9000

auto bond0
iface bond0 inet manual
    bond-slaves eno1 eno2
    bond-miimon 100
    bond-mode 802.3ad
    bond-xmit-hash-policy layer2+3
    mtu 9000

auto vmbr0
iface vmbr0 inet static
    address 10.0.10.20/24
    gateway 10.0.10.1
    bridge-ports bond0
    bridge-stp off
    bridge-fd 0
    bridge-vlan-aware yes
    bridge-vids 2-4094
    mtu 9000

 

[djsami]

i had a similar issue, i had to add auto to my interfaces like so

auto lo
iface lo inet loopback

auto eno1
iface eno1 inet manual
    mtu 9000

auto eno2
iface eno2 inet manual
    mtu 9000

auto bond0
iface bond0 inet manual
    bond-slaves eno1 eno2
    bond-miimon 100
    bond-mode 802.3ad
    bond-xmit-hash-policy layer2+3
    mtu 9000

auto vmbr0
iface vmbr0 inet static
    address 10.0.10.20/24
    gateway 10.0.10.1
    bridge-ports bond0
    bridge-stp off
    bridge-fd 0
    bridge-vlan-aware yes
    bridge-vids 2-4094
    mtu 9000

Hello

ens32ps to eno1 goo proxmoxz okey whm okey