[Bug 1011640] [NEW] network configuration is not restored after host reboot

[Yoann Dubreuil]

Public bug reported:

After rebooting a host, nova-compute fails to restart guests VM because
the network is not configured correctly. I have
resume_guests_state_on_host_boot=true  and
start_guests_on_host_boot=true flags in /etc/nova/nova.conf

nova-network crashs because it lacks brXXX and vlanXXX interfaces.

To restart the guest, i wrote this script to configure the network as
nova did when creating the guest :

#!/bin/sh

add_network() {
    BR=br$1
    VLAN=vlan$1
    LAN=$2
    BCAST=$3
    vconfig add eth1 $1
    brctl addbr $BR
    brctl setfd $BR 0
    brctl stp $BR off
    ip link set $BR up
    ip link show dev $BR
    brctl addif $BR $VLAN
    ip addr show dev $BR scope global
    ip addr add "$LAN" brd "$BCAST" dev $BR
}

vconfig set_name_type VLAN_PLUS_VID_NO_PAD

add_network 100 "172.16.0.4/24" "172.16.0.255"
add_network 101 "172.16.1.4/24" "172.16.1.255"
add_network 102 "172.16.2.4/24" "172.16.2.255"
add_network 103 "172.16.3.4/24" "172.16.3.255"
add_network 104 "172.16.4.4/24" "172.16.4.255"

I think nova-network should recreate lacking interfaces (brXXX and
vlanXXX) upon reboot to allow nova-compute to start guests

** Affects: nova (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1011640

Title:
  network configuration is not restored after host reboot

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