network configuration is not restored after host reboot

[Yoann Dubreuil]

After rebooting a host, nova-compute fails to restart guests VM because the interface used to create vlan is not UP. In our case, this interface is not connected to a physical network and doesn't have an IP address, so it's not configured on boot.

It could be good to start nova-network even if vlan interfaces cannot be set up. Here, it crashes while trying to put a vlan interface UP, as you can see in the attached log file

For other people eventually affected by the problem, i initially wrote this script to manually configure network so nova-network can start successfully

#!/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"

[Yoann Dubreuil (ydubreuil)]

Ok,

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/10607

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/10607
Committed: http://github.com/openstack/nova/commit/eab5851b0b55c4230cc11460f9efc6b617ae2e68
Submitter: Jenkins
Branch: master

commit eab5851b0b55c4230cc11460f9efc6b617ae2e68
Author: Chuck Short <email address hidden>
Date: Tue Jul 31 11:49:58 2012 -0400

    Add check exit codes for vlans

    Add check_exit_code to check the ip address
    creation in ensure_vlan.

    Ignores error code '2' and '0' and '254'
    from iproute2, which means the address
    has been added or removed.

    A further audit of return codes will come later.

    LP: #1011640

    Change-Id: Ie95b106446c9f136fa079d95df7a14fe50046696
    Signed-off-by: Chuck Short <email address hidden>