Test following configuration on Network Node of IceHouse Cluster :-

 # cat /etc/nova/nova.conf  | grep -v ^# | grep -v ^$ | grep metadata
    enabled_apis=ec2,osapi_compute,metadata
    metadata_listen=0.0.0.0
    metadata_workers=2
    metadata_host=192.168.1.127
    neutron_metadata_proxy_shared_secret=xxxxxxxxxxxxxx
    service_neutron_metadata_proxy=True


   # cat /etc/neutron/metadata_agent.ini | grep -v ^# | grep -v ^$ | grep metadata
    nova_metadata_ip = 192.168.1.127
    nova_metadata_port = 8775
    metadata_proxy_shared_secret =xxxxxxxxxxxxxxx   (same as above)
    metadata_workers =2
    metadata_backlog = 4096

   # cat /etc/neutron/l3_agent.ini | grep -v ^# | grep -v ^$
    [DEFAULT]
    debug = False
    interface_driver =neutron.agent.linux.interface.OVSInterfaceDriver
    use_namespaces = True
    handle_internal_only_routers = True
    external_network_bridge = br-ex
    metadata_port = 9697
    send_arp_for_ha = 3
    periodic_interval = 40
    periodic_fuzzy_delay = 5
    enable_metadata_proxy = True
    router_delete_namespaces = False

    # cat /etc/neutron/dhcp_agent.ini | grep -v ^# | grep -v ^$ 
    [DEFAULT]
    debug = False
    resync_interval = 30
    interface_driver =neutron.agent.linux.interface.OVSInterfaceDriver
    dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq
    use_namespaces = True
    enable_isolated_metadata = False
    enable_metadata_network = False
    # dnsmasq_config_file = /etc/neutron/dnsmasq.conf
    dhcp_delete_namespaces = False
    root_helper=sudo neutron-rootwrap /etc/neutron/rootwrap.conf
    state_path=/var/lib/neutron

Option enabled_isolated_metada=True , providing access to metadata vi dnsmasq's opts file

root@netnode:/# cat /var/lib/neutron/dhcp/xxxxxxxxxxxxxxxxxxxxxxxxxx/opts 
tag:tag0,option:classless-static-route,169.254.169.254/32,172.17.17.1

was brought to work following http://techbackground.blogspot.ie/201...