CentOS自动获取ip和关闭防火墙

摘要: CentOS自动获取ip和关闭防火墙

一、自动获取IP的方法：

1、/ etc/sysconfig/network-scripts/ifcfg-eth0

[root@smbserver ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0 //由eth0来启动

HWADDR=00:0C:29:40:EC:61 //MAC地址

TYPE=Ethernet

UUID=9c6a7fc6-66ce-406d-993f-6ab26a730e72

ONBOOT=yes //系统启动时网络接口是否有效

NM_CONTROLLED=yes

BOOTPROTO=dhcp //获取IP方式，static是固定IP，none是手动，dhcp是自动获取

2、/etc/sysconfig/network

[root@smbserver ~]# cat /etc/sysconfig/network

NETWORKING=yes

HOSTNAME=smbserver

3、/etc/hosts

[root@smbserver ~]# cat /etc/hosts

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

4、/etc/resolv.conf

[root@smbserver ~]# cat /etc/resolv.conf

# Generated by NetworkManager

nameserver 202.96.128.86

nameserver 8.8.8.8

二、手动设置IP、DNS

手动设定IP、DNS只需要修改三个文件就可以了

1、/etc/sysconfig/network

[zhangy@localhost network-scripts]$ cat /etc/sysconfig/network

NETWORKING=yes

NETWORKING_IPV6=yes

#HOSTNAME=localhost.localdomain //为什么要把主机名注释掉，一般先解析主机名或者域名，再解析DNS

GATEWAY=192.168.1.1 //加上网关

2、/etc/sysconfig/network-scripts/ifcfg-eth0

[zhangy@localhost network-scripts]$ cat ifcfg-eth0

# Marvell Technology Group Ltd. 88E8039 PCI-E Fast Ethernet Controller

DEVICE=eth0

BOOTPROTO=none //启动为手动

BROADCAST=192.168.1.255

HWADDR=00:16:D3:A2:F6:09

IPADDR=192.168.1.108 //设置的IP

NETMASK=255.255.255.0 //子网掩码

NETWORK=192.168.1.0

IPV6INIT=yes

IPV6_AUTOCONF=yes

ONBOOT=yes

TYPE=Ethernet //网络类型

3、/etc/resolv.conf

[zhangy@localhost network-scripts]$ cat /etc/resolv.conf

#; generated by /sbin/dhclient-script

#nameserver 192.168.1.1

#search localdomain

nameserver 116.228.111.118 //加上主DNS

nameserver 180.168.255.18 //加上次DNS

centos 7：

systemctl stop firewalld.service #停止

systemctl disable firewalld.service #禁用

之前的版本：

service iptables stop #停止

chkconfig iptables off #禁用

/etc/rc.d/init.d/iptables stop

关闭命令： service iptables stop

永久关闭防火墙：chkconfig iptables off

两个命令同时运行，运行完成后查看防火墙关闭状态

service iptables status