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为 CentOS7 虚拟机添加第二块网卡

一、在虚拟中添加网卡

1、右击虚拟机，在弹出的菜单中选择【设置】，弹出如下图所示的【虚拟机设置】窗口，在窗口单击【添加】按钮。

2、弹出如下图所示的【添加硬件向导】窗口，在窗口中的【硬件类型】列表中选择【网络适配器】，单击【下一步】按钮。

3、弹出如下图所示的窗口，在窗口的【网络连接】列表中选择【仅主机模式】，单击【完成】按钮完成网卡添加。

4、最终结果如下图所示。其中【网络适配器3】就是新添加的网卡。

二、网卡配置

1、查看新增的网卡信息

[root@localhost ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500inet 192.168.1.12  netmask 255.255.255.0  broadcast 192.168.1.255inet6 fe80::20c:29ff:fe89:50e  prefixlen 64  scopeid 0x20<link>inet6 2409:8a44:3d36:4750:20c:29ff:fe89:50e  prefixlen 64  scopeid 0x0<global>ether 00:0c:29:89:05:0e  txqueuelen 1000  (Ethernet)RX packets 149  bytes 12923 (12.6 KiB)RX errors 0  dropped 50  overruns 0  frame 0TX packets 91  bytes 12014 (11.7 KiB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0ens38: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500ether 00:0c:29:89:05:22  txqueuelen 1000  (Ethernet)RX packets 0  bytes 0 (0.0 B)RX errors 0  dropped 0  overruns 0  frame 0TX packets 0  bytes 0 (0.0 B)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536inet 127.0.0.1  netmask 255.0.0.0inet6 ::1  prefixlen 128  scopeid 0x10<host>loop  txqueuelen 1  (Local Loopback)RX packets 72  bytes 6248 (6.1 KiB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 72  bytes 6248 (6.1 KiB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

2、创建网卡配置文件

（1）查看网卡配置文件

[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# ls
ifcfg-ens33  ifdown-eth   ifdown-isdn    ifdown-sit       ifup          ifup-ib    ifup-plip   ifup-routes    ifup-tunnel        network-functions-ipv6
ifcfg-lo     ifdown-ib    ifdown-post    ifdown-Team      ifup-aliases  ifup-ippp  ifup-plusb  ifup-sit       ifup-wireless
ifdown       ifdown-ippp  ifdown-ppp     ifdown-TeamPort  ifup-bnep     ifup-ipv6  ifup-post   ifup-Team      init.ipv6-global
ifdown-bnep  ifdown-ipv6  ifdown-routes  ifdown-tunnel    ifup-eth      ifup-isdn  ifup-ppp    ifup-TeamPort  network-functions

（2）查看新增网卡的UUID

[root@localhost network-scripts]# nmcli con show
名称        UUID                                  类型            设备  
ens33       0a5654b2-79b9-4f51-960d-bf567c68bdb9  802-3-ethernet  ens33 
有线连接 1  7a1aae4e-a183-351f-95d0-d0c34ded228d  802-3-ethernet  --

（3）使用已存在的网卡配置文件复制一个新的配置文件，名称为ifcfg-ens38

[root@localhost network-scripts]# cp ifcfg-ens33 ifcfg-ens38
[root@localhost network-scripts]# ls
ifcfg-ens33  ifdown-bnep  ifdown-ipv6  ifdown-routes    ifdown-tunnel  ifup-eth   ifup-isdn   ifup-ppp     ifup-TeamPort     network-functions
ifcfg-ens38  ifdown-eth   ifdown-isdn  ifdown-sit       ifup           ifup-ib    ifup-plip   ifup-routes  ifup-tunnel       network-functions-ipv6
ifcfg-lo     ifdown-ib    ifdown-post  ifdown-Team      ifup-aliases   ifup-ippp  ifup-plusb  ifup-sit     ifup-wireless
ifdown       ifdown-ippp  ifdown-ppp   ifdown-TeamPort  ifup-bnep      ifup-ipv6  ifup-post   ifup-Team    init.ipv6-global

（4）修改网卡配置文件ifcfg-ens38的内容如下：

TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
NAME=ens38                   # 网卡名称
UUID=7a1aae4e-a183-351f-95d0-d0c34ded228d
DEVICE=ens38                 # 设备名称
ONBOOT=yesIPADDR=10.1.1.12
PREFIX=24

（5）重新查看新增网卡的`UUID

[root@localhost network-scripts]# nmcli con show
名称   UUID                                  类型            设备  
ens33  0a5654b2-79b9-4f51-960d-bf567c68bdb9  802-3-ethernet  ens33 
ens38  7a1aae4e-a183-351f-95d0-d0c34ded228d  802-3-ethernet  ens38 

（6）查看网卡信息

[root@localhost network-scripts]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500inet 192.168.1.12  netmask 255.255.255.0  broadcast 192.168.1.255inet6 fe80::20c:29ff:fe89:50e  prefixlen 64  scopeid 0x20<link>inet6 2409:8a44:3d36:4750:20c:29ff:fe89:50e  prefixlen 64  scopeid 0x0<global>ether 00:0c:29:89:05:0e  txqueuelen 1000  (Ethernet)RX packets 1374  bytes 110608 (108.0 KiB)RX errors 0  dropped 515  overruns 0  frame 0TX packets 588  bytes 89928 (87.8 KiB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0ens38: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500inet 10.1.1.12  netmask 255.255.255.0  broadcast 10.1.1.255ether 00:0c:29:89:05:22  txqueuelen 1000  (Ethernet)RX packets 0  bytes 0 (0.0 B)RX errors 0  dropped 0  overruns 0  frame 0TX packets 0  bytes 0 (0.0 B)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536inet 127.0.0.1  netmask 255.0.0.0inet6 ::1  prefixlen 128  scopeid 0x10<host>loop  txqueuelen 1  (Local Loopback)RX packets 116  bytes 10740 (10.4 KiB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 116  bytes 10740 (10.4 KiB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

添加成功。