NIC Bonding on CentOS 7 with NMCLI

NIC Bonding on CentOS 7 with NMCLI

1. . Strong style= "padding:0px;margin:0px;" >

By default, the bonding kernel module is not enabled. Therefore, we will need to load it and make sure it lasts. Using Modprobe--first-time to load the bonding module, a warning is issued if the module fails to load.

# modprobe--first-time Bonding

The above command loads only the Bondiing module for the current session, and the module does not load automatically after the server restarts. To ensure continuous loading, the Create/etc/modules-load.d/bonding.conf file is placed in the folder/etc/modules-load.d directory, ensuring that the bonding module is loaded each time the server restarts.

# echo "# Load thebonding kernel module at boot" >/etc/modules-load.d/bonding.conf

# echo "Bonding" >>/etc/modules-load.d/bonding.conf

Ensure that the bonding module is automatically loaded after the server restarts

# lsmod|grep bonding

bonding               136705  0

#

2. NUCLI Create Bond

View existing connections and available network devices

# NMCLI Connection Show

NAME UUID TYPE DEVICE

# NMCLI Device status

DEVICE TYPE State CONNECTION

eno16777736 Ethernet Disconnected--

eno33554992 Ethernet Disconnected--

Bond0 Bond Unmanaged--

Lo Loopback unmanaged--

#

Create Bond

# nmcli con Add type Bond con-name BOND0 ifname bond0 ip4 192.168.31.108/24 mode BALANCE-RR

Connection ' bond0 ' (599582B0-346B-48D3-8F1D-F3BCEE5DECA7) successfully added.

# NMCLI Connection Add type Bond-slave con-name SLAVE1 ifname eno16777736 Master bond0

Connection ' slave1 ' (6A1DD331-BB90-4E92-9AF6-654ED8B2D2CA) successfully added.

# NMCLI Connection Add type Bond-slave con-name SLAVE2 ifname eno33554992 Master bond0

Connection ' Slave2 ' (E31F40C9-4A1C-45D5-9832-8A1705F0B1F7) successfully added.

#nmcli con mod bond0 ipv4.method Manual

#nmcli con mod bond0 ipv4.gateway 192.168.31.1

#nmcli Connection Modify Bond0 Ipv4.dns 192.168.31.1

#nmcli Connection Modify Bond0 bond.options mode=balance-rr,miimon=100,downdelay=0,updelay=0

Restart Network Service After creation

#systemctl Restart Network

# NMCLI Device status

DEVICE TYPE State CONNECTION

Bond0 Bond connected Bond0

eno16777736 Ethernet Connected Slave1

eno33554992 Ethernet Connected Slave2

Lo Loopback unmanaged--

View network links and network devices again

# NMCLI Connection Show

NAME UUID TYPE DEVICE

Bond0 599582B0-346B-48D3-8F1D-F3BCEE5DECA7 Bond Bond0

Slave1 6A1DD331-BB90-4E92-9AF6-654ED8B2D2CA 802-3-ethernet eno16777736

Slave2 E31f40c9-4a1c-45d5-9832-8a1705f0b1f7 802-3-ethernet eno33554992

# IP Addr List

1:lo: <LOOPBACK,UP,LOWER_UP> MTU 65536 qdisc noqueue State UNKNOWN

Link/loopback 00:00:00:00:00:00 BRD 00:00:00:00:00:00

inet 127.0.0.1/8 Scope host Lo

Valid_lft Forever Preferred_lft Forever

INET6:: 1/128 Scope Host

Valid_lft Forever Preferred_lft Forever

2:eno16777736: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> MTU qdisc pfifo_fast Master bond0 State up Qlen 1000

Link/ether 00:0c:29:51:e8:75 BRD FF:FF:FF:FF:FF:FF

3:eno33554992: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> MTU qdisc pfifo_fast Master bond0 State up Qlen 1000

Link/ether 00:0c:29:51:e8:75 BRD FF:FF:FF:FF:FF:FF

4:BOND0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> MTU Qdisc Noqueue State up

Link/ether 00:0c:29:51:e8:75 BRD FF:FF:FF:FF:FF:FF

inet 192.168.31.108/24 BRD 192.168.31.255 Scope Global BOND0

Valid_lft Forever Preferred_lft Forever

Inet6 fe80::233b:2da9:bddd:c8dc/64 Scope link tentative dadfailed

Valid_lft Forever Preferred_lft Forever

Inet6 fe80::875c:5f79:646d:8446/64 Scope link tentative dadfailed

Valid_lft Forever Preferred_lft Forever

Inet6 fe80::bf1c:1978:9c5:6ed7/64 Scope link tentative dadfailed

Valid_lft Forever Preferred_lft Forever

#

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NIC Bonding on CentOS 7 with NMCLI