使用nmcli配置主备模式链路聚合

主备模式的链路聚合将其中一个接口置于备份状态，并且仅当活动接口断开链接时才会使其处于活动状态。

现在让我们在CentOS 7中配置网卡绑定，运行ip link命令查看可以使用的网卡

[root@localhost ~]# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether 08:00:27:7b:d3:32 brd ff:ff:ff:ff:ff:ff
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether 08:00:27:81:d3:be brd ff:ff:ff:ff:ff:ff

在这里使用enp0s3和enp0s8两个网卡配置 主备模式的链路聚合。

创建Team接口

[root@localhost ~]# nmcli connection add type team con-name team0 ifname team0 config '{"runner":{"name":"activebackup"}}' 
Connection 'team0' (4df78635-b9fc-4539-ab02-27db11c656fe) successfully added.

运行nmcli con show查看team0的配置

[root@localhost ~]# nmcli con show
NAME                UUID                                  TYPE      DEVICE 
team0               4df78635-b9fc-4539-ab02-27db11c656fe  team      team0  
enp0s3              5005942f-a7fd-4e55-b8e7-77928d8da72d  ethernet  enp0s3 
Wired connection 1  45dee64a-53b3-3e2a-b2d4-e377f3e668a2  ethernet  enp0s8

添加Slave接口

在这里使用enp0s3和enp0s8两个网卡作为team0的slave接口：

[root@localhost ~]# nmcli connection add type team-slave con-name team0-port1 ifname enp0s3 master team0 
Connection 'team0-port1' (15183c4a-2053-4b53-ad58-de5a07ae3ae9) successfully added.
[root@localhost ~]# nmcli connection add type team-slave con-name team0-port2 ifname enp0s8 master team0
Connection 'team0-port2' (a34e20b0-3422-46e5-a947-bb2eaa6c0622) successfully added.

查看端口配置信息：

[root@localhost ~]# nmcli connection show 
NAME                UUID                                  TYPE      DEVICE 
team0               4df78635-b9fc-4539-ab02-27db11c656fe  team      team0  
enp0s3              5005942f-a7fd-4e55-b8e7-77928d8da72d  ethernet  enp0s3 
Wired connection 1  45dee64a-53b3-3e2a-b2d4-e377f3e668a2  ethernet  enp0s8 
team0-port1         15183c4a-2053-4b53-ad58-de5a07ae3ae9  ethernet  --     
team0-port2         a34e20b0-3422-46e5-a947-bb2eaa6c0622  ethernet  --     

分配IP地址

给team0分配一个静态的IP地址并启动team0配置：

[root@localhost ~]# nmcli connection modify team0 ipv4.method manual ipv4.addresses 192.168.0.200/24 ipv4.gateway 192.168.0.1 ipv4.dns 202.102.128.68
[root@localhost ~]# nmcli connection up team0 
Connection successfully activated (master waiting for slaves) (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/4)

查看连接配置信息，发现team0-port1没有绑定在enp0s3这个网卡接口上

[root@localhost ~]# nmcli connection 

这是以内ifcfg-team0-port1配置文件和ifcfg-enp0s3两个配置文件都设置为开机启动了

所以我们需要关闭enp0s3的开机启动，在这里我们把enp0s3和Wired connection 1这两个配置都关掉开机启动

[root@localhost ~]# nmcli connection modify enp0s3 autoconnect no
[root@localhost ~]# nmcli connection modify Wired connection 1 autoconnect no

然后重启一下网络服务，查看链接配置：

[root@localhost ~]# systemctl restart network
[root@localhost ~]# nmcli connection
[root@localhost ~]# ip ad

可以看到team0-port1和team0-port2都绑定在对应的网卡上面了，team0的ip地址显示的是手动设置的192.168.0.200

验证

查看team0的状态：

[root@localhost ~]# teamdctl team0 state
setup:
  runner: activebackup
ports:
  enp0s3
    link watches:
      link summary: up
      instance[link_watch_0]:
        name: ethtool
        link: up
        down count: 0
  enp0s8
    link watches:
      link summary: up
      instance[link_watch_0]:
        name: ethtool
        link: up
        down count: 0
runner:
  active port: enp0s8

现在活动的端口是enp0s8，我们断开这个端口，看一下主备模式配置是否工作：

[root@localhost ~]# nmcli device disconnect enp0s8 
Device 'enp0s8' successfully disconnected.
[root@localhost ~]# teamdctl team0 state
setup:
  runner: activebackup
ports:
  enp0s3
    link watches:
      link summary: up
      instance[link_watch_0]:
        name: ethtool
        link: up
        down count: 0
runner:
  active port: enp0s3

看到活动接口切换到enp0s3上面了。

总结

主备模式的链路聚合将其中一个接口置于备份状态，并且仅当活动接口断开链接时才会使其处于活动状态。