企业级Linux发行版CentOS安装过后默认是没有开启网络连接服务的,必须手动启动后才能使用网络服务。最新版CentOS 7.0安装后网络配置文件在/etc/sysconfig/network-scripts/目录下,进入该目录后找到其下的网络配置文件:ifcfg-enp0s3(具体文件名会因硬件而异,符合 ifcfg-en* 格式就行),配置文件默认内容如下:
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HWADDR=00:1C:22:AD:74:43 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=enp0s3 UUID=ae0718e7-25s9-43ra-8hp9-9d4g20a88ib1 ONBOOT=no |
修改最后一项ONBOOT=no
为ONBOOT=yes
即开启网络服务,保存退出。
使用如下命令重启网络服务:
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service network restart |
此时网络服务已经开启,可以正常使用。通常会使用ifconfig命令来查看网络连接信息,你可能会发现全新安装的CentOS 7.0并不支持ifconfig命令,会提示“ifconfig command not found”,这时需要额外安装一个网络工具包来解决,命令如下:
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#yum upgrade #yum install net-tools |
安装完成,即可正常使用ifconfig命令来查看ip地址等信息。
也可使用ip addr命令查看网卡信息
如果是设置静态ip,需要修改以下文件
IP相关参数 : /etc/sysconfig/network-scripts/ifcfg-eth0
DNS : /etc/resolv.conf
ifcfg-eth0:
TYPE=Ethernet
BOOTPROTO=static
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=enp0s3
UUID=42ff379e-c051-4a1c-a802-3062f285e0a5
DEVICE=enp0s3
ONBOOT=yes
IPADDR=192.168.7.91
NETMASK=255.255.255.0
GATEWAY=192.168.7.1
NETWORK(网段第一个ip),BROADCAST(广播地址可省略)
DNS:
nameserver 180.76.76.76
nameserver 202.96.134.13
今天帮同事用vbox装虚拟机的时候碰到这个问题
device eth0 does not seem to present.
故障现象:
service network restart
Shutting down loopback insterface: [ OK ]
Bringing up loopback insterface: [ OK ]
Bringing up interface eth0: Device eth0 does not seem to be present,delaying initialization. [FAILED]
解决办法:
首先,打开/etc/udev/rules.d/70-persistent-net.rules内容如下面例子所示:
# vi /etc/udev/rules.d/70-persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:8f:89:9
7", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:50:bd:1
7", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
记录下,eth1网卡的mac地址00:0c:29:50:bd:17
接下来,打开/etc/sysconfig/network-scripts/ifcfg-eth0
# vi /etc/sysconfig/network-scripts/ifcfg-eth0
将 DEVICE="eth0" 改成 DEVICE="eth1" ,
将 HWADDR="00:0c:29:8f:89:97" 改成上面的mac地址 HWADDR="00:0c:29:50:bd:17"
最后,重启网络
# service network restart
或者
# /etc/init.d/network restart
正常了。