Setup Linux Network Bridges on CentOS for Nova Networking
If you’re using Platform9 Managed OpenStack with Nova Networking, Platform9 requires one or more Linux bridges on your Linux servers. The network bridges are used in networking for Virtual Machines. This tutorial will guide you through a step-by-step process to create Linux bridges on CentOS servers.
IMPORTANT: If using Platform9 Managed OpenStack with Neutron Networking, follow Neutron Pre-requisites for Linux/KVM to prepare your physical servers.
Step 1 – Install Prerequisites
Install required packages needed for Linux bridge.
If using CentOS version 6.x or below:
sudo yum install bridge-utils sudo yum install tunctl
If using CentOS version 7.x:
sudo yum install bridge-utils
Step 2 – Disable Network Manager
NetworkManager does not support bridging and therefore must be disabled to setup Linux bridge networking.
chkconfig NetworkManager off chkconfig network on service NetworkManager stop service network start
NOTE: Alternatively, you can add “NM_CONTROLLED=no” to the ifcfg-* script below, and then you do not have to turn off NetworkManager.
Step 3 – Create A Bridge Configuration File
A good convention to follow is to name your Linux bridge after the VLAN to which the bridge is being mapped to (if any). Create file /etc/sysconfig/network-scripts/ifcfg-<your-bridge-name>
Edit the file you just created and add the following parameters along with appropriate values:
DEVICE=<your-bridge-name> TYPE=Bridge BOOTPROTO=<boot-protocol-from-network-interface> DNS1=<your-DNS-address> GATEWAY=<your-Gateway-address> IPADDR=<IP-address-from-network-interface> NETMASK=<your-netmask> ONBOOT=yes SEARCH=”example.com”
Step 4 – Make Your Network Interface Slave To The Bridge Interface
Assuming you would like to map eth0 interface to this bridge, edit the network script file and add following line to it.
# this makes the network interface slave to the bridge BRIDGE=<name-of-bridge-just-created>
Step 5 – Restart Networking
You must now restart networking or reboot OS to make the changes reflect.
sudo service network restart
Step 6 – Network Discovered By Platform9
At this point, your bridge device is successfully configured. If this server has been added to Platform9, the new bridge device will be discovered as a new network by Platform9 within few minutes, and reported as part of the ‘Network’ tab in Infrastructure view.