[Network](EN) VirtualBox network bonding example and test

Make network bonding and test if it is still work even though active slave is down.


Environment and Prerequisite

  • CentOS 7.7.1908
  • Ubuntu 18.04
  • VirtualBox
  • Bash shell(/bin/bash)


Basic Network Structure

  • Bond two NICs
  • By using Host-only Adapter, each VM’s two NICs are connected to vboxnet0
  • In VirtualBox Settings-Network, Adapter 1 is connected to default NAT.
  • In VirtualBox Settings-Network, add new two adapters Adapter 2 and Adapter 3.


Scenario

  1. Ping to bonding interface’s IP address from Client to Server.
  2. Make active slave to Down in Server.
  3. Check ping is still going well.


Network Bonding Setting

CentOS

centos-client

  • bond0
  • /etc/sysconfig/network-scripts/ifcfg-bond0
TYPE=Bond
BOOTPROTO=static
DEFROUTE=no
NAME=bond0
DEVICE=bond0
ONBOOT=yes
PREFIX=24
IPADDR=192.168.99.101
BONDING_OPTS="mode=1 miimon=100 fail_over_mac=1"
  • enp0s8
  • /etc/sysconfig/network-scripts/ifcfg-enp0s8
NAME=enp0s8
DEVICE=enp0s8
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
  • enp0s9
  • /etc/sysconfig/network-scripts/ifcfg-enp0s9
NAME=enp0s9
DEVICE=enp0s9
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes

centos-server

  • bond0
  • /etc/sysconfig/network-scripts/ifcfg-bond0
TYPE=Bond
BOOTPROTO=static
DEFROUTE=no
NAME=bond0
DEVICE=bond0
ONBOOT=yes
PREFIX=24
IPADDR=192.168.99.102
BONDING_OPTS="mode=1 miimon=100 fail_over_mac=1"
  • enp0s8
  • /etc/sysconfig/network-scripts/ifcfg-enp0s9
NAME=enp0s8
DEVICE=enp0s8
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
  • enp0s9
  • /etc/sysconfig/network-scripts/ifcfg-enp0s9
NAME=enp0s9
DEVICE=enp0s9
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes


Ubuntu

  • 18.04 use netplan to set network.
  • Make yaml file and apply it using sudo netplan apply command

ubuntu-client

  • /etc/netplan/50-cloud-init.yaml
# This file is generated from information provided by
# the datasource.  Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        enp0s3:
            dhcp4: true
        enp0s8:
            dhcp4: false
        enp0s9:
            dhcp4: false
    version: 2
    bonds:
        bond0:
            dhcp4: false
            addresses:
                - 192.168.225.101/24
            gateway4: 192.168.225.1
            interfaces:
                - enp0s8
                - enp0s9
            parameters:
                mode: active-backup
                primary: enp0s8
                fail-over-mac-policy: active
                mii-monitor-interval: 100

ubuntu-server

  • /etc/netplan/50-cloud-init.yaml
# This file is generated from information provided by
# the datasource.  Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        enp0s3:
            dhcp4: true
        enp0s8:
            dhcp4: false
        enp0s9:
            dhcp4: false
    version: 2
    bonds:
        bond0:
            dhcp4: false
            addresses:
                - 192.168.225.102/24
            gateway4: 192.168.225.1
            interfaces:
                - enp0s8
                - enp0s9
            parameters:
                mode: active-backup
                primary: enp0s8
                fail-over-mac-policy: active
                mii-monitor-interval: 100


Test

Check each active slave

  • Command: cat /proc/net/bonding/bond0
  • Left is Client and right is Server
  • Active slave: enp0s8


Start ping Client -> Server



Check ping is going well


Check which one is active slave in Server

  • enp0s8 -> enp0s9


Reference

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