linux开机启动网卡

• linux安装完毕以后，我们必须对网卡进行配置才能使用。
• 启用网卡，刚安装完毕，默认网卡为eth0

ifup eth0

• 查看网络配置配置

ifconfig eth0

[root@study ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:0C:29:C2:5A:19
inet addr:10.0.0.101 Bcast:10.0.0.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fec2:5a19/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:216 errors:0 dropped:0 overruns:0 frame:0
TX packets:154 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:22500 (21.9 KiB) TX bytes:19609 (19.1 KiB)

• 设置网卡开机启动
  查看网卡配置

cat /etc/sysconfig/network-scripts/ifcfg-eth0

[root@study ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=00:0C:29:C2:5A:19
TYPE=Ethernet
UUID=b13de4bc-fe1a-4a46-9eb6-21c07bc55ff7
ONBOOT=no
NM_CONTROLLED=yes
BOOTPROTO=dhcp

• ONBOOT=no配置为yes为开机启动网卡
  可以通过setup、vim编辑器和sed命令直接替换，
  前两种较为简单，这里使用sed命令进行替换。

sed "s#ONBOOT=no#ONBOOT=yes#g" /etc/sysconfig/network-scripts/ifcfg-eth0

[root@study ~]# sed "s#ONBOOT=no#ONBOOT=yes#g" /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=00:0C:29:C2:5A:19
TYPE=Ethernet
UUID=b13de4bc-fe1a-4a46-9eb6-21c07bc55ff7
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=dhcp

sed -i "s#ONBOOT=no#ONBOOT=yes#g" /etc/sysconfig/network-scripts/ifcfg-eth0

[root@study ~]# sed -i "s#ONBOOT=no#ONBOOT=yes#g" /etc/sysconfig/network-scripts/ifcfg-eth0

[root@study ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=00:0C:29:C2:5A:19
TYPE=Ethernet
UUID=b13de4bc-fe1a-4a46-9eb6-21c07bc55ff7
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=dhcp

• 配置完重启网卡

ifdown eth0 && ifup eth0

[root@study ~]# ifdown eth0 && ifup eth0
Determining IP information for eth0... done.