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

[Yoann Dubreuil]

Ok,

** Description changed:

  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
+ 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.
  
- nova-network crashs because it lacks brXXX and vlanXXX interfaces.
+ 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
  
- To restart the guest, i wrote this script to configure the network as
- nova did when creating the guest :
+ 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
+     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

** Attachment added: "nova-network crash log"
   https://bugs.launchpad.net/ubuntu/+source/nova/+bug/1011640/+attachment/3185031/+files/nova-network-error.log

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

Title:
  network configuration is not restored after host reboot

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