CentOS 7 单网卡多IP配置

1、 CentOS 7 下的网络配置工具 之前在CentOS 6下编辑网卡，直接使用setup工具就可以了。 但在新版的CentOS 7里，setuptool已经没有网络编辑组件了，取而代之的是NetworkManager Text User Interface，即nmtui。nmtui默认随系统标准安装，如果你使用最小化安装，可能没有该软件，使用下面的命令手动安装：1. yum install NetworkManager-tui在命令行运行 nmtui：1. nmtui如果提示NetworkManager is not running，需要手动启动NetworkManager：1. syste

2、mctl start NetworkManager再次运行 nmtui,即可看到网络编辑界面了，这里可以编辑连接、激活新网络连接和设置主机名字，根据实际需要选择即可：一、nmtui手工添加IP看一下当前网络设备的IP，为了精简指令输出，指令就要复杂一些了：view sourceprint?01.rootcentos7 # nmcli -t -f IP4.ADDRESS dev show enp0s302.IP4.ADDRESS1:ip = 10/24, gw = 5403.rootcentos7 #04

3、.rootcentos7 # ip addr show enp0s3 scope global05.2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 100006.link/ether 08:00:27:15:35:d2 brd ff:ff:ff:ff:ff:ff07.inet 10/24 brd 55 scope glob

4、al enp0s308.valid_lft forever preferred_lft forever09.rootcentos7 #10.rootcentos7 # cat /etc/sysconfig/network-scripts/ifcfg-eth011.12.IPADDR0=1013.PREFIX0=2414.GATEWAY0=5415.DNS1=5416.HWADDR=08:00:27:15:35:D217.IPADDR1=1118.PREFIX1=2419.

5、rootcentos7 #新IP已经被加入到ifcfg-eth0中，原始地址的关键字是 IPADDR0、PREFIX0，新地址的关键字是 IPADDR1、PREFIX1 。view sourceprint?1.rootcentos7 # nmcli con load /etc/sysconfig/network-scripts/ifcfg-eth02.rootcentos7 #3.rootcentos7 # nmcli -t -f IP4.ADDRESS dev show enp0s34.IP4.ADDRESS1:ip = 192.168.15

6、0.110/24, gw = 545.rootcentos7 #<br>rootcentos7 # ip addr show enp0s3 scope global<br>2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000<br>    link/ether 08:00:27:15:35:d2 b

7、rd ff:ff:ff:ff:ff:ff<br>    inet 10/24 brd55 scope global enp0s3<br>       valid_lft forever preferred_lft forever<br>rootcentos7 #load connection 后，NetworkManager 也没有知晓新增IP，新增IP也没有出现在 ip add

8、r show 中。view sourceprint?01.rootcentos7 # systemctl restart network02.rootcentos7 #03.rootcentos7 # nmcli -t -f IP4.ADDRESS dev show enp0s304.IP4.ADDRESS1:ip = 10/24, gw = 5405.IP4.ADDRESS2:ip = 11/24, gw = 5406.

9、rootcentos7 #07.rootcentos7 # ip addr show enp0s3 scope global08.2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 100009.link/ether 08:00:27:15:35:d2 brd ff:ff:ff:ff:ff:ff10.inet 10/24 brd 192.168.150

10、.255 scope global enp0s311.valid_lft forever preferred_lft forever12.rootcentos7 #13.rootcentos7 #14.rootcentos7 # ping 1115.PING 11 (11) 56(84) bytes of data.16.From 10 icmp_seq=1 Destination

11、Host Unreachable17.From 10 icmp_seq=2 Destination Host Unreachable18.19.rootcentos7 #重启network服务后，NetworkManager 知晓新增IP了，但新增IP还是没有生效。view sourceprint?01.rootcentos7 # nmcli dev connect enp0s302.rootcentos7 #03.rootcentos7 #04.rootcentos7 # nmcli -

12、t -f IP4.ADDRESS dev show enp0s305.IP4.ADDRESS1:ip = 10/24, gw = 5406.IP4.ADDRESS2:ip = 11/24, gw = 5407.rootcentos7 #08.rootcentos7 #09.rootcentos7 # ip addr show enp0s3 scope global10.2: enp0s3: <BROADCAST,MU

13、LTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 100011.link/ether 08:00:27:15:35:d2 brd ff:ff:ff:ff:ff:ff12.inet 10/24 brd 55 scope global enp0s313.valid_lft forever preferred_lft forever14.inet 11/24

14、 brd 55 scope global secondary enp0s315.valid_lft forever preferred_lft forever16.rootcentos7 #17.rootcentos7 #18.rootcentos7 # ping 1119.PING 11 (11) 56(84) bytes of data.20.64 bytes from 

15、;11: icmp_seq=1 ttl=64 time=0.039 ms21.64 bytes from 11: icmp_seq=2 ttl=64 time=0.079 ms22.23.rootcentos7 #重新连接设备 enp0s3，新IP生效了。注意：不需要先断开设备（nmcli dev disconnect enp0s3），断开设备的话ssh立刻断线。重新连接设备的过程中，ssh是不会断线的。nmtui添加IP后，需要：nmcli con l

16、oad /etc/sysconfig/network-scripts/ifcfg-eth0nmcli dev connect enp0s3 二、手工添加IP到ifcfg-eth0在ifcfg-eth0配置文件中手工添加如下两行：IPADDR2=12PREFIX2=24先执行 nmcli con load /etc/sysconfig/network-scripts/ifcfg-eth0 后，在nmtui中可以看到新增IP。（也可以简单的用 nmcli con reload ，reload 和 load的区别自己脑补一下吧。）再执行 nmc

17、li dev connect enp0s3 后，IP 12 才生效的。手工添加IP到ifcfg-eth0后，需要：nmcli con load /etc/sysconfig/network-scripts/ifcfg-eth0 或 nmcli con reloadnmcli dev connect enp0s3三、用ip addr add指令添加/删除IP，即刻生效，重启不保留。在线添加IP：view sourceprint?01.rootcentos7 # ip addr add 13/24 dev enp0s

18、302.rootcentos7 #03.rootcentos7 #04.rootcentos7 # nmcli -t -f IP4.ADDRESS dev show enp0s305.IP4.ADDRESS1:ip = 10/24, gw = 5406.IP4.ADDRESS2:ip = 11/24, gw = 5407.IP4.ADDRESS3:ip = 12/24, gw =

19、0;5408.IP4.ADDRESS4:ip = 13/24, gw = 5409.rootcentos7 #10.rootcentos7 #11.rootcentos7 # ip addr show enp0s3 scope global12.2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 100013.

20、link/ether 08:00:27:15:35:d2 brd ff:ff:ff:ff:ff:ff14.inet 10/24 brd 55 scope global enp0s315.valid_lft forever preferred_lft forever16.inet 11/24 brd 55 scope global secondary enp0s317.valid_lft forever

21、preferred_lft forever18.inet 12/24 brd 55 scope global secondary enp0s319.valid_lft forever preferred_lft forever20.inet 13/24 scope global secondary enp0s321.valid_lft forever preferred_lft forever22.rootcentos7 #23.rootcento

22、s7 #24.rootcentos7 # ping 1325.PING 13 (13) 56(84) bytes of data.26.64 bytes from 13: icmp_seq=1 ttl=64 time=0.098 ms27.64 bytes from 13: icmp_seq=2 ttl=64 time

23、=0.255 ms28./etc/sysconfig/network-scripts/ifcfg-eth0 配置文件里并没有13，所以重启后该IP不会保留。在线删除IP：view sourceprint?01.rootcentos7 # ip addr del 13/24 dev enp0s302.rootcentos7 #03.rootcentos7 #04.rootcentos7 # nmcli -t -f IP4.ADDRESS dev show enp0s305.I

24、P4.ADDRESS1:ip = 10/24, gw = 5406.IP4.ADDRESS2:ip = 11/24, gw = 5407.IP4.ADDRESS3:ip = 12/24, gw = 5408.rootcentos7 #09.rootcentos7 #10.rootcentos7 # ip addr show enp0s3 scope g

25、lobal11.2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 100012.link/ether 08:00:27:15:35:d2 brd ff:ff:ff:ff:ff:ff13.inet 10/24 brd 55 scope global enp0s314.valid_lft forever preferred_lft for

26、ever15.inet 11/24 brd 55 scope global secondary enp0s316.valid_lft forever preferred_lft forever17.inet 12/24 brd 55 scope global secondary enp0s318.valid_lft forever preferred_lft forever四、使用子连接配置文件 ifcfg-*:

27、n子连接配置文件是 Centos6 常用的方法，即：如果当前网卡配置文件为 ifcfg-eth0，则子连接配置文件可以为 ifcfg-eth0:1，并且文件中需要写明 DEVICE=eth0:1 ， IPADDR=<新IP地址> 。我们试试在Centos7 中是否也支持。理论上应该是不支持的，因为在Centos7的网络连接配置文件（即 ifcfg-*）中，DEVICE关键字已经具有了新的定义，即我们上篇说的“设备”。参考上篇 首先注释掉ifcfg-eth0中的其他地址，复制 ifcfg-eth0 为 ifcfg-eth0:1，编辑ifcfg-eth0:1， DEVICE 设为eth

28、0:1 ，IP设为 19 ，然后 nmcli con reload ， nmcli dev con enp0s3view sourceprint?01.rootcentos7 # cat /etc/sysconfig/network-scripts/ifcfg-eth002.TYPE=Ethernet03.BOOTPROTO=none04.DEFROUTE=yes05.IPV4_FAILURE_FATAL=no06.IPV6INIT=no07.IPV6_AUTOCONF=yes08.IPV6_DEFROUTE=yes09.IPV6_PEERDNS=yes10

29、.IPV6_PEERROUTES=yes11.IPV6_FAILURE_FATAL=no12.NAME=eth013.UUID=295e1841-0ff3-4db9-8800-4e25fc2944da14.ONBOOT=yes15.IPADDR0=1016.PREFIX0=2417.GATEWAY0=5418.DNS1=5419.HWADDR=08:00:27:15:35:D220.#IPADDR1=1121.#PREFIX1=2422.#IPADDR2=1223.

30、#PREFIX2=2424. 25.rootcentos7 #26.rootcentos7 #27.rootcentos7 # cat /etc/sysconfig/network-scripts/ifcfg-eth0:128.TYPE=Ethernet29.BOOTPROTO=none30.DEFROUTE=yes31.IPV4_FAILURE_FATAL=no32.IPV6INIT=no33.IPV6_AUTOCONF=yes34.IPV6_DEFROUTE=yes35.IPV6_PEERDNS=yes36.IPV6_PEERROUTES=yes37.IPV6_FAILURE_FATAL=no38.NAME=eth0:139.DEVICE=eth0:140.UUID=295e1841-0ff3-4db9-8800-4e25fc2944da41.ONBOOT=yes42.IPADDR0=1943.PREFIX0=2444.GATEWAY0=5445.DNS1=54