CentOS 7 网络配置实例

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在虚拟机中安装CentOS 7后遇到网络不通问题，通过ifconfig检查未找到解决方案。进一步查看网络配置文件，发现网卡配置文件名不再是eth0，暗示了CentOS 7网络配置的变动。

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今天在虚拟机上尝试安装CentOS 7，安装完成后，发现网络不通，无法能过远程连接，也无法更新软件。

于是先调用ifconfig查看IP，

[root@localhost ~]# ifconfig

-bash: ifconfig: command not found

ifconfig没找到，查找看看呢？
[root@localhost ~]# find / -name 'ifconfig'

查找无果，算了，先解决网络的问题。看看网络配置文件，发现网卡配置文件名不是eth0。

[root@localhost ~]# ls /etc/sysconfig/network-scripts/
ifcfg-eno16777736 ifdown-ppp ifup-ib ifup-Team
ifcfg-lo ifdown-routes ifup-ippp ifup-TeamPort
ifdown ifdown-sit ifup-ipv6 ifup-tunnel
ifdown-bnep ifdown-Team ifup-isdn ifup-wireless
ifdown-eth ifdown-TeamPort ifup-plip init.ipv6-global
ifdown-ib ifdown-tunnel ifup-plusb network-functions
ifdown-ippp ifup ifup-post network-functions-ipv6
ifdown-ipv6 ifup-aliases ifup-ppp
ifdown-isdn ifup-bnep ifup-routes
ifdown-post ifup-eth ifup-sit

无所谓，无看看网卡配置文件内容。
[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eno16777736
TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=eno16777736
UUID=c966bef9-483c-440b-ada6-5fb1ec1d9627
DEVICE=eno16777736
#ONBOOT=no
ONBOOT=yes

将ifcfg-eno16777736的ONBOOT=on 改成 ONBOOT=yes，保存退出，再重启网络服务。
[root@localhost ~]# service network restart
Restarting network (via systemctl): [ OK ]

用IP ADDR 命令看看是否获取到IP地址。
[root@localhost ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:41:9a:5c brd ff:ff:ff:ff:ff:ff
inet 192.168.179.131/24 brd 192.168.179.255 scope global dynamic eno16777736
valid_lft 1790sec preferred_lft 1790sec
inet6 fe80::20c:29ff:fe41:9a5c/64 scope link
valid_lft forever preferred_lft forever

IP地址成功获取。再试试ping，看网络通不通。
[root@localhost ~]# ping 114.114.114.114
PING 114.114.114.114 (114.114.114.114) 56(84) bytes of data.
64 bytes from 114.114.114.114: icmp_seq=1 ttl=128 time=41.4 ms
64 bytes from 114.114.114.114: icmp_seq=2 ttl=128 time=42.0 ms
64 bytes from 114.114.114.114: icmp_seq=3 ttl=128 time=42.2 ms
64 bytes from 114.114.114.114: icmp_seq=4 ttl=128 time=42.2 ms
^C
--- 114.114.114.114 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3005ms
rtt min/avg/max/mdev = 41.423/42.010/42.273/0.375 ms

成功ping通外网，试试安装ifconfig工具。
[root@localhost /]# yum install net-tools
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.btte.net
* extras: mirrors.nwsuaf.edu.cn
* updates: mirrors.nwsuaf.edu.cn
.........
Transaction test succeeded
Running transaction
Installing : net-tools-2.0-0.17.20131004git.el7.x86_64 1/1
Verifying : net-tools-2.0-0.17.20131004git.el7.x86_64 1/1

Installed:
net-tools.x86_64 0:2.0-0.17.20131004git.el7

Complete!

大功知成！

[root@localhost /]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.179.131 netmask 255.255.255.0 broadcast 192.168.179.255
inet6 fe80::20c:29ff:fe41:9a5c prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:41:9a:5c txqueuelen 1000 (Ethernet)
RX packets 498 bytes 349875 (341.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 286 bytes 42325 (41.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0