{"id":12949,"date":"2019-03-29T03:51:21","date_gmt":"2019-03-29T03:51:21","guid":{"rendered":"http:\/\/www.appservgrid.com\/paw92\/?p=12949"},"modified":"2019-03-29T03:51:21","modified_gmt":"2019-03-29T03:51:21","slug":"how-to-setup-and-configure-network-bonding-or-teaming-in-rhel-centos-7","status":"publish","type":"post","link":"https:\/\/www.appservgrid.com\/paw92\/index.php\/2019\/03\/29\/how-to-setup-and-configure-network-bonding-or-teaming-in-rhel-centos-7\/","title":{"rendered":"How to Setup and Configure Network Bonding or Teaming in RHEL\/CentOS 7"},"content":{"rendered":"

When a system administrator wants to increase the bandwidth available and provide redundancy and load balancing for data transfers, a kernel feature known as network\u00a0bonding<\/strong>\u00a0allows to get the job done in a cost-effective way.<\/p>\n

Read more about how to increase or bandwidth throttling in Linux<\/p>\n

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How to Limit the Network Bandwidth Used by Applications in a Linux with Tricklehttp:\/\/www.<\/span>tecmint.com\/manage-and-limit-downloadupload-bandwidth-with-trickle-in-linux\/\u00a0<\/span>\u2026<\/a>
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In simple words, bonding means aggregating two or more physical network interfaces (called slaves) into a single, logical one (called master). If a specific NIC (Network Interface Card) experiences a problem, communications are not affected significantly as long as the other(s) remain active.<\/p>\n

Read more about network bonding in Linux systems here:<\/p>\n

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  1. Network Teaming or NiC Bondin in RHEL\/CentOS 6\/5<\/a><\/li>\n
  2. Network NIC Bonding or Teaming on Debian based Systems<\/a><\/li>\n
  3. How to Configure Network Bonding or Teaming in Ubuntu<\/a><\/li>\n<\/ol>\n

    Enabling and Configuring Network Bonding or Teaming<\/h3>\n

    By default, the bonding kernel module is not enabled. Thus, we will need to load it and ensure it is persistent across boots. When used with the\u00a0--first-time<\/code>\u00a0option,\u00a0modprobe<\/strong>\u00a0will alert us if loading the module fails:<\/p>\n

    # modprobe --first-time bonding\r\n<\/pre>\n
    The above command will load the bonding module for the current session. In order to ensure persistency, create a\u00a0.conf<\/code>\u00a0file inside\u00a0\/etc\/modules-load.d<\/code>\u00a0with a descriptive name, such as\u00a0\/etc\/modules-load.d\/bonding.conf<\/code>:<\/p>\n
    # echo \"# Load the bonding kernel module at boot\" > \/etc\/modules-load.d\/bonding.conf\r\n# echo \"bonding\" >> \/etc\/modules-load.d\/bonding.conf\r\n<\/pre>\n
    Now reboot your server and once it restarts, make sure the bonding module is loaded automatically, as seen in\u00a0Fig. 1<\/strong>:<\/p>\n
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    \"Check<\/a><\/p>\n
    Check Network Bonding Module Loaded in Kernel<\/p>\n<\/div>\n
    In this article we will use 3 interfaces (enp0s3<\/code>,\u00a0enp0s8<\/code>, and\u00a0enp0s9<\/code>) to create a bond, named conveniently\u00a0bond0<\/code>.<\/p>\n
    To create\u00a0bond0<\/code>, we can either use\u00a0nmtui<\/strong>, the text interface for controlling\u00a0NetworkManager<\/strong>. When invoked without arguments from the command line,\u00a0nmtui<\/strong>\u00a0brings up a text interface that allows you to edit an existing connection, activate a connection, or set the system hostname.<\/p>\n
    Choose\u00a0Edit connection<\/strong>\u00a0\u2013>\u00a0Add<\/strong>\u00a0\u2013>\u00a0Bond<\/strong>\u00a0as illustrated in\u00a0Fig. 2<\/strong>:<\/p>\n
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    \"Create<\/a><\/p>\n
    Create Network Bonding Channel<\/p>\n<\/div>\n
    In the\u00a0Edit Connection<\/strong>\u00a0screen, add the slave interfaces (enp0s3<\/code>,\u00a0enp0s8<\/code>, and\u00a0enp0s9<\/code>\u00a0in our case) and give them a descriptive (Profile) name (for example,\u00a0NIC #1<\/code>,\u00a0NIC #2<\/code>, and\u00a0NIC #3<\/code>, respectively).<\/p>\n
    In addition, you will need to set a name and device for the bond (TecmintBond<\/code>\u00a0and\u00a0bond0<\/code>\u00a0in Fig. 3, respectively) and an IP address for\u00a0bond0<\/code>, enter a gateway address, and the IPs of DNS servers.<\/p>\n
    Note<\/strong>\u00a0that you do not need to enter the MAC address of each interface since\u00a0nmtui<\/strong>\u00a0will do that for you. You can leave all other settings as default. See Fig. 3 for more details.<\/p>\n
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    \"Network<\/a><\/p>\n
    Network Bonding Teaming Configuration<\/p>\n<\/div>\n
    When you\u2019re done, go to the bottom of the screen and choose\u00a0OK<\/strong>\u00a0(see Fig. 4):<\/p>\n
    \n
    \"Configuration<\/a><\/p>\n
    Configuration of bond0<\/p>\n<\/div>\n
    And you\u2019re done. Now you can exit the text interface and return to the command line, where you will enable the newly created interface using\u00a0ip command<\/a>:<\/p>\n
    # ip link set dev bond0 up\r\n<\/pre>\n
    After that, you can see that\u00a0bond0<\/code>\u00a0is UP and is assigned\u00a0192.168.0.200<\/strong>, as seen in Fig. 5:<\/p>\n
    # ip addr show bond0\r\n<\/pre>\n
    \n
    \"Check<\/a><\/p>\n
    Check Network Bond Interface Status<\/p>\n<\/div>\n
    Testing Network Bonding or Teaming in Linux<\/h3>\n
    To verify that\u00a0bond0<\/code>\u00a0actually works, you can either ping its IP address from another machine, or what\u2019s even better, watch the kernel interface table in real time (well, the refresh time in seconds is given by the\u00a0-n<\/code>\u00a0option) to see how network traffic is distributed between the three network interfaces, as shown in Fig. 6.<\/p>\n
    The\u00a0-d<\/code>\u00a0option is used to highlight changes when they occur:<\/p>\n
    # watch -d -n1 netstat -i\r\n<\/pre>\n
    \n
    \"Check<\/a><\/p>\n
    Check Kernel Interface Table<\/p>\n<\/div>\n
    It is important to note that there are several bonding modes, each with its distinguishing characteristics. They are documented in section 4.5 of the\u00a0Red Hat Enterprise Linux 7 Network Administration<\/a>\u00a0guide. Depending on your needs, you will choose one or the other.<\/p>\n
    In our current setup, we chose the\u00a0Round-robin<\/strong>\u00a0mode (see Fig. 3), which ensures packets are transmitted beginning with the first slave in sequential order, ending with the last slave, and starting with the first again.<\/p>\n
    The Round-robin alternative is also called\u00a0mode 0<\/code>, and provides load balancing and fault tolerance. To change the bonding mode, you can use\u00a0nmtui<\/strong>\u00a0as explained before (see also Fig. 7):<\/p>\n
    \n
    \"Changing<\/a><\/p>\n
    Changing Bonding Mode Using nmtui<\/p>\n<\/div>\n
    If we change it to\u00a0Active Backup<\/strong>, we will be prompted to choose a slave that will the only one active interface at a given time. If such card fails, one of the remaining slaves will take its place and becomes active.<\/p>\n
    Let\u2019s choose\u00a0enp0s3<\/code>\u00a0to be the primary slave, bring\u00a0bond0<\/code>\u00a0down and up again, restart the network, and display the kernel interface table (see Fig. 8).<\/p>\n
    Note how data transfers (TX-OK<\/strong>\u00a0and\u00a0RX-OK<\/strong>) are now being made over\u00a0enp0s3<\/code>\u00a0only:<\/p>\n
    # ip link set dev bond0 down\r\n# ip link set dev bond0 up\r\n# systemctl restart network\r\n<\/pre>\n
    \n
    \"Bond<\/a><\/p>\n
    Bond Acting in Active Backup Mode<\/p>\n<\/div>\n
    Alternatively, you can view the bond as the kernel sees it (see Fig. 9):<\/p>\n
    # cat \/proc\/net\/bonding\/bond0\r\n<\/pre>\n
    \n
    \"Check<\/a><\/p>\n
    Check Network Bond as Kernel<\/p>\n<\/div>\n
    Summary<\/h3>\n
    In this chapter we have discussed how to set up and configure bonding in\u00a0Red Hat Enterprise Linux 7<\/strong>\u00a0(also works on\u00a0CentOS 7<\/strong>\u00a0and\u00a0Fedora 22+<\/strong>) in order to increase bandwidth along with load balancing and redundancy for data transfers.<\/p>\n
    As you take the time to explore other bonding modes, you will come to master the concepts and practice related with this topic of the certification.<\/p>\n
    Source<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
    When a system administrator wants to increase the bandwidth available and provide redundancy and load balancing for data transfers, a kernel feature known as network\u00a0bonding\u00a0allows to get the job done in a cost-effective way. Read more about how to increase or bandwidth throttling in Linux View image on Twitter Linux Inside: The Ideal Blog for … <\/p>\n
    Continue reading “How to Setup and Configure Network Bonding or Teaming in RHEL\/CentOS 7”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-12949","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/posts\/12949","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/comments?post=12949"}],"version-history":[{"count":1,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/posts\/12949\/revisions"}],"predecessor-version":[{"id":12950,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/posts\/12949\/revisions\/12950"}],"wp:attachment":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/media?parent=12949"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/categories?post=12949"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/tags?post=12949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}