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Warning: The actions described below are dangerous and can cause loosing of remote access to the server. It is recommended to have direct access to the server in order to revert the changes back in case of emergency.

  1. Connect to the slave KVM node via SSH
  2. Disable Network Manager as it may interfere with the bridge.

    # systemctl stop NetworkManager.service
    # systemctl disable NetworkManager.service
    # systemctl enable network.service
    # systemctl start network.service
  3. Additionally, it makes sense to review the network configuration file, e.g. /etc/sysconfig/network-scripts/ifcfg-eth0 and verify that it is disabled there as well

    NM_CONTROLLED=no
  4. Install bridge-utils package:

    # yum install bridge-utils
  5. The example of the network configuration file is below:

    TYPE="Ethernet"
    PROXY_METHOD="none"
    BROWSER_ONLY="no"
    BOOTPROTO="none"
    DEFROUTE="yes"
    IPV4_FAILURE_FATAL="no"
    IPV6INIT="yes"
    IPV6_AUTOCONF="yes"
    IPV6_DEFROUTE="yes"
    IPV6_FAILURE_FATAL="no"
    IPV6_ADDR_GEN_MODE="stable-privacy"
    NAME="eth0"
    UUID="8d6f722c-b945-4083-b50e-9661bf62ae5f"
    DEVICE="eth0"
    ONBOOT="yes"
    IPADDR="203.0.113.2"
    GATEWAY="203.0.113.1"
    NETMASK="255.255.0.0"
    DNS1="8.8.8.8"
    IPV6_PRIVACY="no"
  6. Create a copy of the network interface:

    # cp /etc/sysconfig/network-scripts/ifcfg-eth0 /root/ifcfg-eth0.orig

    Note: It is recommended move non-used configuration files out of the network-scripts/ sub-directory. Be aware that configuration files that starts from ifcfg-* files will be applied, including ifcfg-eth0.backup file.

  7. Create the bridge file:

    # nano -w /etc/sysconfig/network-scripts/ifcfg-br0
  8. Copy network configuration settings from ifcfg-eth0 to ifcfg-br0 file to make it look like below:

    DEVICE=br0
    TYPE=Bridge
    BOOTPROTO=static
    ONBOOT=yes
    IPV6_AUTOCONF=yes
    IPV6_DEFROUTE=yes
    IPV6_PEERDNS=yes
    IPV6_PEERROUTES=yes
    IPV6_FAILURE_FATAL=no
    IPADDR="203.0.113.2"
    NETMASK="255.255.0.0"
    GATEWAY="203.0.113.1"
  9. Edit the ifcfg-eth0 as below:

    NAME=eth0
    DEVICE=eth0
    ONBOOT=yes
    IPV6INIT=yes
    IPV6_AUTOCONF=yes
    BRIDGE=br0
    Warning: All parameters should be written with capitalized characters, e.g. BRIDGE=br0 and NOT Bridge=br0
  10. Restart the network service to apply the changes:

    # service network restart


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