[Bug 1084028] Re: openvswitch based interfaces not started in time during boot

[Michael Polenchuk]

confirmed this bug on ubuntu 14.04.5 (ovs 2.5.9, openstack mitaka):
### ifcfg-br-mesh ###
auto br-mesh
allow-ovs br-mesh
iface br-mesh inet static
ovs_type OVSBridge
ovs_ports ens5
address 192.168.2.4/24
ovs_extra set Bridge br-mesh datapath_type=netdev

### ifcfg-ens5 ###
allow-br-mesh ens5
iface ens5 inet manual
ovs_type DPDKOVSPort
ovs_bridge br-mesh
dpdk_port dpdk0

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https://bugs.launchpad.net/bugs/1084028

Title:
  openvswitch based interfaces not started in time during boot

Status in openvswitch package in Ubuntu:
  Fix Released

Bug description:
  If you create network interfaces (access ports) in openvswitch, and
  configure them in /etc/network/interfaces, failsafe.conf will kick in
  and the interfaces get configured after failsafe.conf exits. This adds
  two minutes to boot time.

  openvswitch config:

  ovs-vsctl show
  93e6b401-214b-4089-ac51-27ca43009cce
      Bridge "br0"
          Port "br0"
              Interface "br0"
                  type: internal
          Port "vlan128"
              tag: 128
              Interface "vlan128"
                  type: internal
          Port "bond0"
              trunks: [128]
              Interface "eth0"
              Interface "eth5"
      Bridge "br1"
          Port "bond1"
              trunks: [143, 145]
              Interface "eth1"
              Interface "eth4"
          Port "phy-br1"
              Interface "phy-br1"
          Port "br1"
              Interface "br1"
                  type: internal
          Port "int-br1"
              Interface "int-br1"
      ovs_version: "1.4.3"

  cat /etc/network/interfaces:

  # interfaces(5) file used by ifup(8) and ifdown(8)
  auto lo
  iface lo inet loopback

  auto eth0
  iface eth0 inet manual
        pre-up ip link set $IFACE up
        post-down ip link set $IFACE down

  auto eth1
  iface eth1 inet manual
        pre-up ip link set $IFACE up
        post-down ip link set $IFACE down

  auto eth4
  iface eth4 inet manual
        pre-up ip link set $IFACE up
        post-down ip link set $IFACE down

  auto eth5
  iface eth5 inet manual
        pre-up ip link set $IFACE up
        post-down ip link set $IFACE down

  auto vlan128
  iface vlan128 inet static
      address 172.17.128.102
      netmask 255.255.255.0

  I expected openvswitch (interfaces/ports/bonds/trunks) to be up-and-
  running before /etc/network/interfaces gets evaluated.

  Clint Byrum (Ubuntu) reported me the following:

   "failsafe.conf will exit when all interfaces marked as 'auto' are "up". The
  only time you get a 2 minute delay is when it takes that long to bring those
  interfaces up. Since you have these vlanXXX interfaces listed, the system
  is waiting for them to come up.

  It seems to me that openvswitch needs to be brought up before runlevel 2, and
  so probably needs an upstart job. This sounds like a clear bug."

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