建立網路聚合

多個網路連接埠整合成一個虛擬網路卡可增加原本單埠時的速度，使用 nmcli 語法：
```
#nmcli con add type team con-name CNAME ifname INAME [config JSON]
```
JSON (JavaScript Object Notation) 指定使用 runner，語法為：
```
'{"runner":{"name":"METHOD"}}'
```
METHOD 在 RHEL7/CentOS7 中支援的 Teaming 模式有 broadcast, activebackup, roundrubin, loadbalance 與 lacp 五種，細節可以參考 teamd.conf 手冊。
```
[root@kvm7 ~]# man 5 teamd.conf
```

產生 team 介面卡之前，先查看目前主機有 eth0 eth1 eth2 三張網卡。

[root@kvm5 ~]# nmcli device 
DEVICE  TYPE      STATE         CONNECTION 
eth0    ethernet  connected     eth0       
eth1    ethernet  disconnected  --         
eth2    ethernet  disconnected  --         
lo      loopback  unmanaged     --

使用 activebackup 模式產生一個名為 team0 的網路 team 介面。

[root@kvm5 ~]# nmcli connection add type team con-name team0 ifname team0 \
config '{"runner": {"name": "activebackup"}}'
Connection 'team0' (e1d07964-d037-4d1d-ae23-4a6d6430d82d) successfully added.

查看 device 或 connection，多了 team0 的網路 team 介面，其網路連線設定名稱也是 team0。

[root@kvm5 ~]# nmcli device 
DEVICE  TYPE      STATE                                  CONNECTION 
eth0    ethernet  connected                              eth0       
team0   team      connecting (getting IP configuration)  team0      
eth1    ethernet  disconnected                           --         
eth2    ethernet  disconnected                           --         
lo      loopback  unmanaged                              --         
[root@kvm5 ~]# nmcli connection 
NAME   UUID                                  TYPE            DEVICE 
team0  e1d07964-d037-4d1d-ae23-4a6d6430d82d  team            team0  
eth0   657b29a2-b7c0-4176-a955-b12aadf9c156  802-3-ethernet  eth0

指定 eth1 及 eth2 為 team0 的網路埠。

[root@kvm5 ~]# nmcli connection add type team-slave con-name \
team0-port1 ifname eth1 master team0 
Connection 'team0-port1' (e150c255-b7a2-47d8-977d-e1f429249aaf) 
successfully added.
[root@kvm5 ~]# nmcli connection add type team-slave con-name \
team0-port2 ifname eth2 master team0 
Connection 'team0-port2' (ebb32a20-01d3-4a36-8501-8fd02c5e9b20) 
successfully added.

重啟網路。

[root@kvm5 ~]# systemctl restart network.service

查看 team0 是不是包含 eth1 及 eth2 兩個成員埠。

[root@kvm5 ~]# teamdctl team0 state
setup:
  runner: activebackup
ports:
  eth1
    link watches:
      link summary: up
      instance[link_watch_0]:
        name: ethtool
        link: up
  eth2
    link watches:
      link summary: up
      instance[link_watch_0]:
        name: ethtool
        link: up
runner:
  active port: eth1

設定 team0 綁定的 ip 192.168.122.15, netmask 255.255.255.0。因為要自行設定 IP, NETMASK 等參數，所以設定 team0 ipv4.method 為 manual，也就是手動，而不是 auto。
```
[root@kvm5 ~]# nmcli connection modify team0 \
ipv4.addresses 192.168.122.15/24 ipv4.method manual
```

啟動 team0。

[root@kvm5 ~]# nmcli connection up team0
Connection successfully activated (D-Bus active path: 
/org/freedesktop/NetworkManager/ActiveConnection/119)

查看 team0 的 IP 為 192.168.122.15。

[root@kvm5 ~]# ifconfig team0
team0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.122.15  netmask 255.255.255.0  broadcast 192.168.122.255
        inet6 fe80::5054:ff:fe00:51  prefixlen 64  scopeid 0x20<link>
        ether 52:54:00:00:00:51  txqueuelen 0  (Ethernet)
        RX packets 21  bytes 798 (798.0 B)
        RX errors 0  dropped 54  overruns 0  frame 0
        TX packets 33  bytes 5408 (5.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0