[root@localhost ~]# ifconfig //查看网卡信息
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 //此时无法获取IP地址
inet6 fe80::a85a:c203:e2e:3f3c prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:5b:d3:a0 txqueuelen 1000 (Ethernet)
RX packets 47 bytes 30451 (29.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 122 bytes 13596 (13.2 KiB)
...//省略部分内容...
[root@localhost ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens33 //进入ens33网卡配置文件
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
//更改dhcp为static配置静态IP地址
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
UUID=2ef6b862-5201-48c5-a450-23b3720ab3a0
DEVICE=ens33
ONBOOT=yes
IPADDR=192.168.100.100
//配置IP地址
NETMASK=255.255.255.0
//配置子网掩码
GATEWAY=192.168.100.1
//配置网关
~
~
:wq
//保存退出
[root@localhost ~]# service network restart
//重新启动网络服务
Restarting network (via systemctl):
[ 确定 ]
[root@localhost ~]# ifconfig
//查看网卡信息
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 //获取静态IP地址
inet 192.168.100.100 netmask 255.255.255.0 broadcast 192.168.100.255
inet6 fe80::a85a:c203:e2e:3f3c prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:5b:d3:a0 txqueuelen 1000 (Ethernet)
RX packets 48 bytes 30694 (29.9 KiB)
...//省略部分内容...
[root@localhost ~]# vim /etc/dhcp/dhcpd.conf
//进入dhcp服务主配置文件
#
# DHCP Server Configuration file.
# see /usr/share/doc/dhcp*/dhcpd.conf.example //显示dhcp配置文件模板位置
# see dhcpd.conf(5) man page
#
~
...//省略部分内容...
~
:r /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example //将dhcpd配置文件模板写入主配置文件
//写入的著配置文件：
#
# dhcpd.conf
#
# Sample configuration file for ISC dhcpd
#
# option definitions common to all supported networks...
option domain-name "example.org";
option domain-name-servers ns1.example.org, ns2.example.org;
default-lease-time 600;
max-lease-time 7200;
# Use this to enble / disable dynamic dns updates globally.
#ddns-update-style none;
# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
#authoritative;
# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;
# No service will be given on this subnet, but declaring it helps the
# DHCP server to understand the network topology.
subnet 10.152.187.0 netmask 255.255.255.0 {
}
//主要在此处做出更改
# This is a very basic subnet declaration.
subnet 10.254.239.0 netmask 255.255.255.224 {
range 10.254.239.10 10.254.239.20;
option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;
}
//更改后的配置文件信息：
...//省略部分内容...
# No service will be given on this subnet, but declaring it helps the
# DHCP server to understand the network topology.
subnet 192.168.100.0 netmask 255.255.255.0 {
//更改IP网段
range 192.168.100.100 192.168.100.200;
//可以分配的IP地址范围
option routers 192.168.100.1;
//网关信息（注意，每段结束以；结尾）
}
//注意最后的大括号不可删除，否则服务无法开启
subnet 192.168.10.0 netmask 255.255.255.0 {
range 192.168.10.100 192.168.10.200; //添加vlan 10网段的地址分配条目
option routers 192.168.10.1;
}
subnet 192.168.20.0 netmask 255.255.255.0 {
range 192.168.20.100 192.168.20.200; //添加vlan 20网段的地址分配条目
option routers 192.168.20.1;
}
# This is a very basic subnet declaration.
:wq
//保存退出
//因为我们这边设置了三个vlan，网段都不相同，所以三个网段都要添加
[root@localhost ~]# systemctl start dhcpd
//开启dhcp服务
[root@localhost ~]# systemctl status dhcpd
//查看服务是否开启
dhcpd.service - DHCPv4 Server Daemon
Loaded: loaded (/usr/lib/systemd/system/dhcpd.service; disabled; vendor preset: disabled)
Active: active (running) since 三 2019-09-04 22:56:05 CST; 14s ago //服务成功开启
Docs: man:dhcpd(8)
man:dhcpd.conf(5)
Main PID: 5343 (dhcpd)
Status: "Dispatching packets..."
CGroup: /system.slice/dhcpd.service
└─5343 /usr/sbin/dhcpd -f -cf /etc/dhcp/dhcpd.conf -user dhcpd -group dhc...
9月 04 22:56:05 localhost.localdomain dhcpd[5343]: No subnet declaration for virbr....
...//省略部分内容...
9月 04 22:56:05 localhost.localdomain systemd[1]: Started DHCPv4 Server Daemon.
Hint: Some lines were ellipsized, use -l to show in full.
