確保系統(tǒng)已加載bonding模塊並確認(rèn)網(wǎng)卡接口可用，使用modprobe bonding和lsmod驗(yàn)證；2. 創(chuàng)建/etc/sysconfig/network-scripts/ifcfg-bond0配置文件，設(shè)置DEVICE、TYPE、BONDING_MASTER、IP參數(shù)及BONDING_OPTS=mode=active-backup miimon=100 primary=ens33；3. 配置物理網(wǎng)卡ens33和ens34的ifcfg文件，設(shè)置MASTER=bond0、SLAVE=yes並移除IP配置；4. 重啟網(wǎng)絡(luò)服務(wù)使用systemctl restart network或nmcli con reload；5. 通過(guò)cat /proc/net/bonding/bond0、ip addr show bond0和ping測(cè)試驗(yàn)證bond狀態(tài)和連通性；6. 可選使用nmcli命令在CentOS 8 /Stream中創(chuàng)建bond和添加從接口並激活；7. 注意交換機(jī)需配合配置LACP模式，選擇適合的bond模式並測(cè)試故障切換。配置完成後，系統(tǒng)將具備網(wǎng)絡(luò)冗餘和高可用性，且配置適用於CentOS 7、8及Stream版本。

Configuring network bonding (also known as link aggregation or NIC teaming) in CentOS allows you to combine multiple network interfaces into a single logical interface for redundancy, increased bandwidth, or load balancing. This guide applies to CentOS 7, 8, and Stream , using the traditional network-scripts method (still supported in CentOS 7 and 8) and briefly touches on nmcli for newer systems.

? Step 1: Check Available Interfaces and Kernel Module

Before configuring bonding, verify your network interfaces and ensure the bonding module is loaded.

 ip link show

List available network interfaces (eg, ens33 , ens34 ).

Load and check the bonding kernel module:

 modprobe bonding
lsmod | grep bonding

To load it at boot:

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

? Step 2: Create the Bond Interface Configuration

We'll create a bonded interface named bond0 using two physical NICs: ens33 and ens34 .

Create the bond master interface

Edit the bond interface configuration:

 vi /etc/sysconfig/network-scripts/ifcfg-bond0

Add the following (example using active-backup mode):

 DEVICE=bond0
NAME=bond0
TYPE=Bond
BONDING_MASTER=yes
BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.1.10
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
DNS1=8.8.8.8
BONDING_OPTS="mode=active-backup miimon=100 primary=ens33"

? Key Parameters:

• mode=active-backup : Only one NIC is active; another takes over if it fails.
• miimon=100 : Monitor link every 100ms.
• primary=ens33 : Use ens33 as the default active interface.

Other common modes:

• balance-rr : Round-robin (requires switch support)
• 802.3ad : LACP (dynamic aggregation, requires switch support)

? Step 3: Configure Slave (Physical) Interfaces

Now configure each physical NIC to be part of the bond.

Configure first slave: ens33

 vi /etc/sysconfig/network-scripts/ifcfg-ens33

 DEVICE=ens33
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes

Configure second slave: ens34

 vi /etc/sysconfig/network-scripts/ifcfg-ens34

 DEVICE=ens34
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes

? Important: Remove any existing IP configurations from slave interfaces.

? Step 4: Restart Network Service

Apply the configuration:

 systemctl restart network

Or on some systems:

 nmcli con reload

? Step 5: Verify the Bonding Configuration

Check if the bond is up:

 cat /proc/net/bonding/bond0

This shows detailed bonding status, including active interface, link monitoring, and slave status.

Also verify with:

 ip addr show bond0

And test connectivity:

 ping -I bond0 8.8.8.8

? Optional: Using nmcli (Recommended for CentOS 8 /Stream)

For modern systems using NetworkManager, you can use nmcli :

 # Create bond
nmcli con add type bond con-name bond0 ifname bond0 mode active-backup miimon 100 primary ens33 ip4 192.168.1.10/24 gw4 192.168.1.1

# Add slaves
nmcli con add type ethernet con-name bond0-slave1 ifname ens33 master bond0
nmcli con add type ethernet con-name bond0-slave2 ifname ens34 master bond0

# Activate
nmcli con up bond0

Check status:

 nmcli con show
nmcli dev show bond0

?? Notes and Best Practices

• Switch Configuration : For 802.3ad or lacp , ensure the switch is configured for LACP.
• Mode Selection :
  • Use active-backup for failover without switch support.
  • Use 802.3ad for performance and redundancy with compatible switches.
• Always test failover by unplugging one cable and checking /proc/net/bonding/bond0 .

That's it. Your CentOS system now has a resilient network bond. The exact steps may vary slightly depending on your CentOS version and network manager, but this method works reliably across most setups.

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