在当前主机添加两块网卡，将两块网卡绑定实现网卡冗余操作。

连接会话

[root@xixi ~]# nmcli device connect ens224
Device 'ens224' successfully activated with '39bef2c8-fc11-4059-84b9-679bfb13719a'.
[root@xixi ~]# nmcli device connect ens256
Device 'ens256' successfully activated with 'b27b5e56-6c3c-4dc8-9f95-5c0a924fa971'.

[root@xixi ~]# nmcli device status
DEVICE TYPE STATE CONNECTION
ens160 ethernet connected ens160
ens224 ethernet connected ens224
ens256 ethernet connected ens256
virbr0 bridge connected virbr0
lo loopback unmanaged --
virbr0-nic tun unmanaged --

5: ens256: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:0c:29:79:d6:07 brd ff:ff:ff:ff:ff:ff
inet 192.168.225.131/24 brd 192.168.225.255 scope global dynamic noprefixroute ens256
valid_lft 1764sec preferred_lft 1764sec
inet6 fe80::2b84:62ab:7ee7:12f2/64 scope link noprefixroute
valid_lft forever preferred_lft forever
6: ens224: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:0c:29:79:d6:11 brd ff:ff:ff:ff:ff:ff
inet 192.168.225.130/24 brd 192.168.225.255 scope global dynamic noprefixroute ens224
valid_lft 1758sec preferred_lft 1758sec
inet6 fe80::81f0:cc46:b792:268a/64 scope link noprefixroute
valid_lft forever preferred_lft forever

创建 team0 设备和 team0 会话

[root@xixi ~]# nmcli connection add type team ifname team0 con-name team0 config '{"runner":{"name": "activebackup"}}'
[root@xixi doc]# cd /usr/share/doc/teamd/example_configs/
[root@xixi example_configs]# ll
total 64
-rw-r--r--. 1 root root 305 Jul 26 2020 activebackup_arp_ping_1.conf
-rw-r--r--. 1 root root 465 Jul 26 2020 activebackup_arp_ping_2.conf
-rw-r--r--. 1 root root 194 Jul 26 2020 activebackup_ethtool_1.conf
-rw-r--r--. 1 root root 212 Jul 26 2020 activebackup_ethtool_2.conf
-rw-r--r--. 1 root root 241 Jul 26 2020 activebackup_ethtool_3.conf
-rw-r--r--. 1 root root 447 Jul 26 2020 activebackup_multi_lw_1.conf
-rw-r--r--. 1 root root 285 Jul 26 2020 activebackup_nsna_ping_1.conf
-rw-r--r--. 1 root root 318 Jul 26 2020 activebackup_tipc.conf
-rw-r--r--. 1 root root 96 Jul 26 2020 broadcast.conf
-rw-r--r--. 1 root root 209 Jul 26 2020 lacp_1.conf
-rw-r--r--. 1 root root 98 Jul 26 2020 loadbalance_1.conf
-rw-r--r--. 1 root root 140 Jul 26 2020 loadbalance_2.conf
-rw-r--r--. 1 root root 183 Jul 26 2020 loadbalance_3.conf
-rw-r--r--. 1 root root 93 Jul 26 2020 random.conf
-rw-r--r--. 1 root root 244 Jul 26 2020 roundrobin_2.conf
-rw-r--r--. 1 root root 97 Jul 26 2020 roundrobin.conf

[root@xixi example_configs]# more activebackup_arp_ping_2.conf
{
   "device":   "team0",
   "runner":   {"name": "activebackup"},
   "link_watch":   {
       "name": "arp_ping",
       "interval": 100,
       "missed_max": 30,
       "source_host": "192.168.23.2",
       "target_host": "192.168.23.1"
   },
   "ports":   {
       "eth1": {
           "prio": -10,
           "sticky": true
       },

向team0中添加从设备（ens224、256）

[root@xixi ~]# nmcli connection add type team-slave ifname ens224 con-name team0-port1 master team0
Connection 'team0-port1' (3c198f30-556c-407d-8a58-1c7e123b4791) successfully added.
[root@xixi ~]# nmcli connection add type team-slave ifname ens256 con-name team0-port2 master team0
Connection 'team0-port2' (cd8f75d6-e16a-402e-a651-a8d964683282) successfully added.

先激活 team0-port1、team0-port2 从设备，再激活 team0 主设备

[root@xixi ~]# nmcli connection up team0-port1
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/11)
[root@xixi ~]# nmcli connection up team0-port2
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/12)
[root@xixi ~]# nmcli connection up team0
Connection successfully activated (master waiting for slaves) (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/13)

[root@xixi ~]# nmcli connection show
NAME UUID TYPE DEVICE
ens160 f667da4f-915c-4c68-ba16-2211ac796d6a ethernet ens160
team0 597c5007-56ea-402b-9768-48ea445f47c4 team team0
virbr0 82441c83-895c-46c2-add3-a9b378921af6 bridge virbr0
team0-port1 3c198f30-556c-407d-8a58-1c7e123b4791 ethernet ens224
team0-port2 cd8f75d6-e16a-402e-a651-a8d964683282 ethernet ens256
ens224 39bef2c8-fc11-4059-84b9-679bfb13719a ethernet --
ens256 b27b5e56-6c3c-4dc8-9f95-5c0a924fa971 ethernet --

查看 team0 的工作状态

[root@xixi ~]# teamdctl team0 stat
setup:
runner: activebackup
ports:
ens224
link watches:
link summary: up
instance[link_watch_0]:
name: ethtool
link: up
down count: 0
ens256
link watches:
link summary: up
instance[link_watch_0]:
name: ethtool
link: up
down count: 0
runner:
active port: ens224

7: team0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 00:0c:29:79:d6:11 brd ff:ff:ff:ff:ff:ff
inet 192.168.225.130/24 brd 192.168.225.255 scope global dynamic noprefixroute team0

当从设备 team0-port1 （ens224）断开时，会切换到 ens256

[root@xixi ~]# nmcli connection down team0-port1
Connection 'team0-port1' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/14)
[root@xixi ~]# teamdctl team0 stat
setup:
runner: activebackup
ports:
ens256
link watches:
link summary: up
instance[link_watch_0]:
name: ethtool
link: up
down count: 0
runner:
active port: ens256