Need to reset Networking

[Christian0490]

Hey,
I have a Proxmox VE installation on which i had my DNS Server and some other stuff.
I accidentally deleted vmbr0 as network bridge.
I tried a reatsrt but after that my vms couldnt start again because vmbr0 wasnt there.
I manually added a vmbr0 and now i cant even access the WebUI anymore...

If i restart the system and try to ping anything it says "Temporary failure in host resolution" and I have to run
dhclient -r
dhclient
To get an IP and reset the resolv.conf to get anything working, the web ui still wont work.


Please help

 

[Christian0490]

Some Updates:

i cleared the /etc/network/interfaces and now get the correct ip address over my eno1.
I also can access the WebUi.

If i try to start on of my VMs i get the following Error messages:

bridge 'vmbr0' does not exist
kvm: -netdev type=tap,id=net0,ifname=tap100i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on: network script /var/lib/qemu-server/pve-bridge failed with status 512
TASK ERROR: start failed: QEMU exited with code 1

My interfaces config looks like this:

root@pve:/etc/network# cat interfaces
# network interface settings; autogenerated
# Please do NOT modify this file directly, unless you know what
# you're doing.
#
# If you want to manage parts of the network configuration manually,
# please utilize the 'source' or 'source-directory' directives to do
# so.
# PVE will preserve these directives, but will NOT read its network
# configuration from sourced files, so do not attempt to move any of
# the PVE managed interfaces into external files!
auto lo
iface lo inet loopback
root@pve:/etc/network#

 

[sw-omit]

also give the output of ip a

But to get you started, try adding the following BELOW what you already have:

auto vmbr0
iface vmbr0 inet dhcp
        bridge-ports eno0
        bridge-stp off
        bridge-fd 0

source /etc/network/interfaces.d/*

Sidenote: DHCP for the proxmox-host is not recommended