After finishing nova compute node installation, final step run 'service nova-compute restart' and get following message, any suggestion?

 1. nova-compute.log

    raise exception.HypervisorUnavailable(host=CONF.host)
    HypervisorUnavailable: Connection to the hypervisor is broken on host: ubuntu127.thinker.cn

 2. nova-compute.conf

    [DEFAULT] compute_driver=libvirt.LibvirtDriver

    [libvirt]
    virt_type=kvm

 3. nova.conf (nova compute node)

    [DEFAULT]
    dhcpbridge_flagfile=/etc/nova/nova.conf
    dhcpbridge=/usr/bin/nova-dhcpbridge
    logdir=/var/log/nova
    state_path=/var/lib/nova
    force_dhcp_release=True
    libvirt_use_virtio_for_bridges=True
    verbose=True
    ec2_private_dns_show_ip=True
    api_paste_config=/etc/nova/api-paste.ini
    enabled_apis=ec2,osapi_compute,metadata
    rpc_backend = rabbit
    auth_strategy = keystone
    my_ip = 114.X.X.127
    vncserver_listen = 0.0.0.0
    vncserver_proxyclient_address = 114.X.X.127
    vnc_enabled = True
    novncproxy_base_url = http://ubuntu126.thinker.cn:6080/vnc_auto.html


    [oslo_messaging_rabbit]
    rabbit_host = ubuntu126.thinker.cn
    rabbit_userid = openstack
    rabbit_password = mypasswd

    [keystone_authtoken]
    auth_uri = http://ubuntu126.thinker.cn:5000
    auth_url = http://ubuntu126.thinker.cn:35357
    auth_plugin = password
    project_domain_id = default
    user_domain_id = default
    project_name = service
    username = nova
    password = mypasswd

    [glance]
    host = ubuntu126.thinker.cn

    [oslo_concurrency]
    lock_path = /var/lib/nova/tmp