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[Daniel Kuffner <daniel.kuffner@xxxxxxxxx>]

Public bug reported:

A openstack docker setup in multi_host (FlatDHCPManager) network mode
assigns the wrong gateway address to docker container instances.

Currently does the docker driver use the gateway information delivered by nova. 
The gateway is always 10.0.0.1 (my private network). The IP address 10.0.0.1 is ot availbale.
I looked up the dnsmasq instances on all compute nodes which is in my case 

node1: 10.0.0.3
node2: 10.0.0.5

I figured out if I set the default gateway of a docker container
instance to the IP address of the dnsmasq everything works as expected.
Therefor I assume that this has to be the gateway.

The correct dnsmasq IP address is delivered in the the network_info as
shown in the example below (meta': {u'dhcp_server': u'10.0.0.5'}):

network_info:
{
    'bridge': u'br100',
    'subnets': [Subnet({
        'ips': [FixedIP({
            'meta': {},
            'version': 4,
            'type': u'fixed',
            'floating_ips': [],
            'address': u'10.0.0.10',
            })],
        'version': 4,
        'meta': {u'dhcp_server': u'10.0.0.5'},
        'dns': [IP({
            'meta': {},
            'version': 4,
            'type': u'dns',
            'address': u'10.129.184.2',
            })],
        'routes': [],
        'cidr': u'10.0.0.0/24',
        'gateway': IP({
            'meta': {},
            'version': 4,
            'type': u'gateway',
            'address': u'10.0.0.1',
            }),
        }),

** Affects: nova
     Importance: Undecided
     Assignee: Daniel Kuffner (daniel-kuffner)
         Status: New


** Tags: docker

** Changed in: nova
     Assignee: (unassigned) => Daniel Kuffner (daniel-kuffner)

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https://bugs.launchpad.net/bugs/1279509

Title:
  Docker Instance  in multi_host network mode receives the wrong gateway
  ip address

Status in OpenStack Compute (Nova):
  New

Bug description:
  A openstack docker setup in multi_host (FlatDHCPManager) network mode
  assigns the wrong gateway address to docker container instances.

  Currently does the docker driver use the gateway information delivered by nova. 
  The gateway is always 10.0.0.1 (my private network). The IP address 10.0.0.1 is ot availbale.
  I looked up the dnsmasq instances on all compute nodes which is in my case 

  node1: 10.0.0.3
  node2: 10.0.0.5

  I figured out if I set the default gateway of a docker container
  instance to the IP address of the dnsmasq everything works as
  expected. Therefor I assume that this has to be the gateway.

  The correct dnsmasq IP address is delivered in the the network_info as
  shown in the example below (meta': {u'dhcp_server': u'10.0.0.5'}):

  network_info:
  {
      'bridge': u'br100',
      'subnets': [Subnet({
          'ips': [FixedIP({
              'meta': {},
              'version': 4,
              'type': u'fixed',
              'floating_ips': [],
              'address': u'10.0.0.10',
              })],
          'version': 4,
          'meta': {u'dhcp_server': u'10.0.0.5'},
          'dns': [IP({
              'meta': {},
              'version': 4,
              'type': u'dns',
              'address': u'10.129.184.2',
              })],
          'routes': [],
          'cidr': u'10.0.0.0/24',
          'gateway': IP({
              'meta': {},
              'version': 4,
              'type': u'gateway',
              'address': u'10.0.0.1',
              }),
          }),

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