网络管理和配置文件

禁用network

chkconfig --list network

network         0:off   1:off   2:on    3:on    4:on    5:on    6:off

chkconfig --level 2345 network off

network         0:off   1:off   2:off   3:off   4:off   5:off   6:off

chkconfig --level 2345 network on

network         0:off   1:off   2:on    3:on    4:on    5:on    6:off

CentOS7 禁用 NetworkManager，向下兼容CentOS6

systemctl disable NetworkManager

查看网络的配置文件

cd /etc/sysconfig/network-scripts/
ls ifcfg-*
cat ifcfg-eth0

可以看到

DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
IPADDR=51.161.63.226
GATEWAY=158.69.116.254
NETMASK=255.255.255.255
DNS1=8.8.8.8

修改配置后重启服务

service network restart
或者
systemctl restart NetworkManager.service

查看网络配置
ifconfig eth0

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 51.161.63.226  netmask 255.255.255.255  broadcast 51.161.63.226
        inet6 fe80::250:56ff:fe0c:16e2  prefixlen 64  scopeid 0x20<link>
        ether 00:50:56:0c:16:e2  txqueuelen 1000  (Ethernet)
        RX packets 58292  bytes 3653738 (3.4 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1950  bytes 281005 (274.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

查看路由信息
route -n

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         158.69.116.254  0.0.0.0         UG    100    0        0 eth0
51.161.63.226   0.0.0.0         255.255.255.255 UH    100    0        0 eth0
158.69.116.254  0.0.0.0         255.255.255.255 UH    100    0        0 eth0

查看DNS服务器

nslookup
> server

Default server: 8.8.8.8
Address: 8.8.8.8#53
Default server: 8.8.4.4
Address: 8.8.4.4#53

修改hostname

hostnamectl set-hostname c7.lula
修改后，需要修改hosts，否则会出现服务器重启速度慢的问题（超时等待）
vi /etc/hosts
添加一行
127.0.0.1 c7.lula

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