由于需要给虚拟机(Oracle Linux 7.1)增加网卡并设置IP操作,在增加网卡后执行ifconfig命令可以看到增加的网卡信息，但没有生成网卡配置文件。
[root@linuxidc ~]# ifconfig ens34: flags=4163 mtu 1500 ether 00:50:56:a0:7e:4c txqueuelen 1000 (Ethernet) RX packets 14332 bytes 1177864 (1.1 MiB) RX errors 0 dropped 25 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 ens160: flags=4163 mtu 1500 inet 10.138.130.171 netmask 255.255.255.0 broadcast 10.138.130.255 inet6 fe80::250:56ff:feb1:260 prefixlen 64 scopeid 0x20 ether 00:50:56:b1:02:60 txqueuelen 1000 (Ethernet) RX packets 14524 bytes 1203727 (1.1 MiB) RX errors 0 dropped 11 overruns 0 frame 0 TX packets 349 bytes 31569 (30.8 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73 mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 0 (Local Loopback) RX packets 1152 bytes 89096 (87.0 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1152 bytes 89096 (87.0 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 virbr0: flags=4099 mtu 1500 inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255 ether 52:54:00:88:ce:47 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 6 bytes 1172 (1.1 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@linuxidc ~]# cd /etc/sysconfig/network-scripts [root@linuxidc network-scripts]# ls -lrt total 232 -rwxr-xr-x. 1 root root 1876 Nov 6 2014 ifup-TeamPort -rwxr-xr-x. 1 root root 1755 Nov 6 2014 ifup-Team -rwxr-xr-x. 1 root root 1556 Nov 6 2014 ifdown-TeamPort -rwxr-xr-x. 1 root root 1599 Nov 6 2014 ifdown-Team -rw-r--r--. 1 root root 26134 Jan 15 2015 network-functions-ipv6 -rw-r--r--. 1 root root 15316 Jan 15 2015 network-functions -rwxr-xr-x. 1 root root 4623 Jan 15 2015 init.ipv6-global -rwxr-xr-x. 1 root root 1740 Jan 15 2015 ifup-wireless -rwxr-xr-x. 1 root root 2682 Jan 15 2015 ifup-tunnel -rwxr-xr-x. 1 root root 3263 Jan 15 2015 ifup-sit -rwxr-xr-x. 1 root root 1925 Jan 15 2015 ifup-routes -rwxr-xr-x. 1 root root 4154 Jan 15 2015 ifup-ppp -rwxr-xr-x. 1 root root 2609 Jan 15 2015 ifup-post -rwxr-xr-x. 1 root root 1043 Jan 15 2015 ifup-plusb -rwxr-xr-x. 1 root root 642 Jan 15 2015 ifup-plip -rwxr-xr-x. 1 root root 10430 Jan 15 2015 ifup-ipv6 -rwxr-xr-x. 1 root root 12039 Jan 15 2015 ifup-ippp -rwxr-xr-x. 1 root root 11502 Jan 15 2015 ifup-eth -rwxr-xr-x. 1 root root 859 Jan 15 2015 ifup-bnep -rwxr-xr-x. 1 root root 12616 Jan 15 2015 ifup-aliases -rwxr-xr-x. 1 root root 1462 Jan 15 2015 ifdown-tunnel -rwxr-xr-x. 1 root root 1444 Jan 15 2015 ifdown-sit -rwxr-xr-x. 1 root root 837 Jan 15 2015 ifdown-routes -rwxr-xr-x. 1 root root 1068 Jan 15 2015 ifdown-ppp -rwxr-xr-x. 1 root root 1642 Jan 15 2015 ifdown-post -rwxr-xr-x. 1 root root 4201 Jan 15 2015 ifdown-ipv6 -rwxr-xr-x. 1 root root 781 Jan 15 2015 ifdown-ippp -rwxr-xr-x. 1 root root 5817 Jan 15 2015 ifdown-eth -rwxr-xr-x. 1 root root 627 Jan 15 2015 ifdown-bnep -rw-r--r--. 1 root root 254 Jan 15 2015 ifcfg-lo -rwxr-xr-x. 1 root root 10145 Mar 6 2015 ifup-ib -rwxr-xr-x. 1 root root 6196 Mar 6 2015 ifdown-ib lrwxrwxrwx. 1 root root 24 Nov 5 10:11 ifdown -> ../../../usr/sbin/ifdown lrwxrwxrwx. 1 root root 11 Nov 5 10:11 ifdown-isdn -> ifdown-ippp lrwxrwxrwx. 1 root root 22 Nov 5 10:11 ifup -> ../../../usr/sbin/ifup lrwxrwxrwx. 1 root root 9 Nov 5 10:11 ifup-isdn -> ifup-ippp -rw-r--r--. 1 root root 358 Nov 5 12:01 ifcfg-ens160可以看到并没有生成网卡配置文件ifcfg-ens34,而之前在创建虚拟机时增加的网卡ens160是有相应的配置文件ifcfg-ens160。在oracle linux 7.1中使用nmtui来设置网络，nmtui 属于curses-based text user interface（文本用户界面)， 类似Linux7以前的setup工具
[root@linuxidc ~]# nmtui
使用nmtui设置完后可以看到生成了网卡ens34的配置文件ifcfg-ens34
[root@linuxidc network-scripts]# ls -lrt total 236 -rwxr-xr-x. 1 root root 1876 Nov 6 2014 ifup-TeamPort -rwxr-xr-x. 1 root root 1755 Nov 6 2014 ifup-Team -rwxr-xr-x. 1 root root 1556 Nov 6 2014 ifdown-TeamPort -rwxr-xr-x. 1 root root 1599 Nov 6 2014 ifdown-Team -rw-r--r--. 1 root root 26134 Jan 15 2015 network-functions-ipv6 -rw-r--r--. 1 root root 15316 Jan 15 2015 network-functions -rwxr-xr-x. 1 root root 4623 Jan 15 2015 init.ipv6-global -rwxr-xr-x. 1 root root 1740 Jan 15 2015 ifup-wireless -rwxr-xr-x. 1 root root 2682 Jan 15 2015 ifup-tunnel -rwxr-xr-x. 1 root root 3263 Jan 15 2015 ifup-sit -rwxr-xr-x. 1 root root 1925 Jan 15 2015 ifup-routes -rwxr-xr-x. 1 root root 4154 Jan 15 2015 ifup-ppp -rwxr-xr-x. 1 root root 2609 Jan 15 2015 ifup-post -rwxr-xr-x. 1 root root 1043 Jan 15 2015 ifup-plusb -rwxr-xr-x. 1 root root 642 Jan 15 2015 ifup-plip -rwxr-xr-x. 1 root root 10430 Jan 15 2015 ifup-ipv6 -rwxr-xr-x. 1 root root 12039 Jan 15 2015 ifup-ippp -rwxr-xr-x. 1 root root 11502 Jan 15 2015 ifup-eth -rwxr-xr-x. 1 root root 859 Jan 15 2015 ifup-bnep -rwxr-xr-x. 1 root root 12616 Jan 15 2015 ifup-aliases -rwxr-xr-x. 1 root root 1462 Jan 15 2015 ifdown-tunnel -rwxr-xr-x. 1 root root 1444 Jan 15 2015 ifdown-sit -rwxr-xr-x. 1 root root 837 Jan 15 2015 ifdown-routes -rwxr-xr-x. 1 root root 1068 Jan 15 2015 ifdown-ppp -rwxr-xr-x. 1 root root 1642 Jan 15 2015 ifdown-post -rwxr-xr-x. 1 root root 4201 Jan 15 2015 ifdown-ipv6 -rwxr-xr-x. 1 root root 781 Jan 15 2015 ifdown-ippp -rwxr-xr-x. 1 root root 5817 Jan 15 2015 ifdown-eth -rwxr-xr-x. 1 root root 627 Jan 15 2015 ifdown-bnep -rw-r--r--. 1 root root 254 Jan 15 2015 ifcfg-lo -rwxr-xr-x. 1 root root 10145 Mar 6 2015 ifup-ib -rwxr-xr-x. 1 root root 6196 Mar 6 2015 ifdown-ib lrwxrwxrwx. 1 root root 24 Nov 5 10:11 ifdown -> ../../../usr/sbin/ifdown lrwxrwxrwx. 1 root root 11 Nov 5 10:11 ifdown-isdn -> ifdown-ippp lrwxrwxrwx. 1 root root 22 Nov 5 10:11 ifup -> ../../../usr/sbin/ifup lrwxrwxrwx. 1 root root 9 Nov 5 10:11 ifup-isdn -> ifup-ippp -rw-r--r--. 1 root root 346 Mar 16 12:36 ifcfg-ens160 -rw-r--r--. 1 root root 181 Mar 16 12:42 ifcfg-ens34