Linux 下搭建 DHCP 服务步骤详解|一次部署终身省心

# CentOS 7yum install -y dhcp# CentOS 8/9/Rocky Linuxdnf install -y dhcp

#备份原始配置cp /etc/dhcp/dhcpd.conf /etc/dhcp/dhcpd.conf.bak#编辑配置vim /etc/dhcp/dhcpd.conf

#全局配置（所有子网生效）ddns-update-style none;        # 关闭DNS动态更新（局域网必选）default-lease-time 86400;      # 默认租约1天（秒）max-lease-time 172800;         # 最大租约2天（秒）option domain-name "lan.local"; # 局域网域名option domain-name-servers 223.5.5.5, 114.114.114.114; # DNS（阿里+114）authoritative;                  # 声明为权威dhcp服务器#子网配置（核心：必须与服务器IP同网段）subnet 192.168.2.0 netmask 255.255.255.0 {range 192.168.2.10 192.168.2.200;  # 动态IP地址池option routers 192.168.2.1;         # 网关（路由器/网关IP）option subnet-mask 255.255.255.0;   # 子网掩码option broadcast-address 192.168.2.255; # 广播地址}#固定IP绑定（打印机/服务器/门禁，可选，根据实际情况配置）#host printer {#hardware ethernet 00:11:22:33:44:55; # 设备MAC地址#fixed-address 192.168.1.88;          # 绑定IP（不在地址池内）}

firewall-cmd --add-service=dhcp --permanentfirewall-cmd --reloadfirewall-cmd --list-services  # 验证是否放行

setenforce 0sed -i 's/SELINUX=enforcig/SELINUX=disabled/' /etc/selinux/config

#启动服务systemctl start dhcpd#开机自启systemctl enable dhcpd#查看状态systemctl status dhcpd#重启（修改配置后必执行）systemctl restart dhcpd

1. 服务端验证#检查端口监听（看到UDP 67即正常）netstat -ulnp | grep dhcp#实时查看日志（排错神器）journalctl -u dhcpd -f

ipconfig /release  #释放IPipconfig /renew    #获取IPipconfig           #查看IP、网关、DNS

dhclient ens33  #获取IPip addr         #查看配置

# 安装yum install -y dnsmasq# 配置vim /etc/dnsmasq.confinterface=ens33dhcp-range=192.168.2.10,192.168.2.200,24hdhcp-option=option:router,192.168.2.1dhcp-option=option:dns-server,223.5.5.5# 启动systemctl enable --now dnsmasq