Connect instances to the physical network

Bridge the virtual network to the physical network to enable connectivity to instances.

About this task

In this procedure, the example physical interface, eth0, is mapped to the bridge, br-ex; the virtual bridge acts as the intermediary between the physical network and any virtual networks.

As a result, all traffic traversing eth0 uses the configured Open vSwitch to reach instances.

To map a physical NIC to the virtual Open vSwitch bridge, complete the following steps:

Procedure

  1. Open /etc/sysconfig/network-scripts/ifcfg-eth0 in a text editor, and update the following parameters with values appropriate for the network at your site:
    • IPADDR
    • NETMASK GATEWAY
    • DNS1 (name server)

      Here is an example:

      DEVICE=eth0
TYPE=OVSPort
DEVICETYPE=ovs
OVS_BRIDGE=br-ex
ONBOOT=yes
  2. Open /etc/sysconfig/network-scripts/ifcfg-br-ex in a text editor and update the virtual bridge parameters with the IP address values that were previously allocated to eth0: 
    DEVICE=br-ex
DEVICETYPE=ovs
TYPE=OVSBridge
BOOTPROTO=static
IPADDR=192.168.120.10
NETMASK=255.255.255.0
GATEWAY=192.168.120.1
DNS1=192.168.120.1
ONBOOT=yes

    You can now assign floating IP addresses to instances and make them available to the physical network.