{"id":32,"date":"2021-04-20T12:53:31","date_gmt":"2021-04-20T11:53:31","guid":{"rendered":"https:\/\/www.simplyhosting.com\/support\/?post_type=ht_kb&p=32"},"modified":"2022-02-11T16:55:44","modified_gmt":"2022-02-11T16:55:44","slug":"interface-bonding-on-redhat","status":"publish","type":"ht_kb","link":"https:\/\/www.simplyhosting.com\/support\/articles\/interface-bonding-on-redhat\/","title":{"rendered":"Interface Bonding on Redhat"},"content":{"rendered":"\n

This step by step guide is for configuring interface bonding on Redhat based operating systems.

For the following guide we will use the following data and assume that you are running all commands as the root user:<\/p>\n\n\n\n

Type<\/th>Value<\/th><\/tr>
Primary interface<\/td>em1<\/td><\/tr>
Secondary interface<\/td>em2<\/td><\/tr>
Bond interface<\/td>bond0<\/td><\/tr>
IP Address<\/td>192.0.2.2<\/td><\/tr>
Netmask<\/td>255.255.255.0<\/td><\/tr>
Gateway<\/td>192.0.2.1<\/td><\/tr>
Primary MAC address<\/td>00:00:5E:00:53:00<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Step-by-step guide<\/h2>\n\n\n\n

How to do it:<\/p>\n\n\n\n

  1. Determine whether the bonding module is loaded:<\/li><\/ol>\n\n\n\n
    lsmod | grep bonding<\/pre>\n\n\n\n
    1. If it is loaded go to step 3, otherwise:<\/li><\/ol>\n\n\n\n
      modprobe bonding<\/pre>\n\n\n\n
      1. With the bonding module loaded into the kernel we need to determine what the interfaces are called:<\/li><\/ol>\n\n\n\n
        ls \/sys\/class\/net\/<\/pre>\n\n\n\n
        1. From this list we need to select which interfaces we are going to use in the bond (the slaves). In most cases this will be the first two interfaces (eth0 & eth1, em1 & em2, eno0 & eno1 etc.)
          Before we change the physical interface configurations, we need to create the bond interface.
          The simplest way to create the bond interface configuration file is to copy the primary interface file (ifcfg-em1) to the bond interface file (ifcfg-bond0) and edit it.<\/li><\/ol>\n\n\n\n
          cp \/etc\/sysconfig\/network-scripts\/ifcfg-em1 \/etc\/sysconfig\/network-scripts\/ifcfg-bond0 && sed -i 's\/em1\/bond0\/g' \/etc\/sysconfig\/network-scripts\/ifcfg-bond0 && sed -i 's\/HWADDR\/MACADDR\/g' \/etc\/sysconfig\/network-scripts\/ifcfg-bond0 && sed -i '\/uuid\/d' \/etc\/sysconfig\/network-scripts\/ifcfg-bond0 && echo 'BONDING_OPTS=\"mode=802.3ad lacp_rate=1\"' >> \/etc\/sysconfig\/network-scripts\/ifcfg-bond0 && echo 'USERCTL=no' >> \/etc\/sysconfig\/network-scripts\/ifcfg-bond0 && echo 'NM_CONTROLLED=no' >> \/etc\/sysconfig\/network-scripts\/ifcfg-bond0<\/pre>\n\n\n\n
          This will do the following configuration changes:<\/p>\n\n\n\n
          DEVICE=em1 \nBOOTPROTO=static \nIPADDR=192.0.2.2 \nSCOPE=\"peer 192.0.2.1\" \nGATEWAY=192.0.2.1 \nNETWORK=192.0.2.1 \nHWADDR=00:00:5E:00:53:00 \nNETMASK=255.255.255.255 \nONBOOT=yes \nTYPE=Ethernet \nDNS1=217.112.87.147 \nDNS2=217.112.88.90 \nDNS3=217.112.88.10 \nIPV6INIT=yes \nIPV6ADDR=2001:0db8:0000:0800:0192:0000:0002:0002\/128 \nUUID=\"6eb9d580-b46e-4d63-adcc-17e5df965054\"<\/pre>\n\n\n\n
          DEVICE=bond0 \nBOOTPROTO=static \nIPADDR=192.0.2.2 \nSCOPE=\"peer 192.0.2.1\" \nGATEWAY=192.0.2.1 \nNETWORK=192.0.2.1 \nMACADDR=00:00:5E:00:53:00 \nNETMASK=255.255.255.255 \nONBOOT=yes \nTYPE=Ethernet \nDNS1=217.112.87.147 \nDNS2=217.112.88.90 \nDNS3=217.112.88.10 \nIPV6INIT=yes \nIPV6ADDR=2001:0db8:0000:0800:0192:0000:0002:0002\/128 \nBONDING_OPTS=\"mode=802.3ad lacp_rate=1\" \nUSERCTL=no \nNM_CONTROLLED=no <\/pre>\n\n\n\n
          We have:<\/p>\n\n\n\n