Ubuntu 配置DHCP server

安装 isc-dhcp-server

apt install isc-dhcp-server

使用 ens38 网卡做为dhcp server的服务接口，先配置一个IP地址192.168.1.1

修改 /etc/dhcp/dhcpd.conf 配置子网

# dhcpd.conf
#
# Sample configuration file for ISC dhcpd
#
# Attention: If /etc/ltsp/dhcpd.conf exists, that will be used as
# configuration file instead of this file.
#

subnet 192.168.1.0 netmask 255.255.255.0 {
    range 192.168.1.100 192.168.1.200;
    default-lease-time 600;
    max-lease-time 7200;
    option subnet-mask 255.255.255.0;
    option domain-name-servers ns1.internal.example.org;
    option domain-name "internal.example.org";
    option broadcast-address 192.168.1.255;
    option routers 192.168.1.1;
    option domain-name-servers 114.114.114.114, 8.8.8.8;
    option domain-name "isc.org";
}

修改 /etc/default/isc-dhcp-server 中的接口变量

INTERFACESv4="ens38"

此时启动 isc-dhcp-server

systemctl restart isc-dhcp-server

我这启动失败了，是 /lib/systemd/system/isc-dhcp-server.service 启动命令有错误，修改完的如下

[Unit]
Description=ISC DHCP IPv4 server
Documentation=man:dhcpd(8)
Wants=network-online.target
After=network-online.target
After=time-sync.target
ConditionPathExists=/etc/default/isc-dhcp-server
ConditionPathExists=|/etc/ltsp/dhcpd.conf
ConditionPathExists=|/etc/dhcp/dhcpd.conf

[Service]
EnvironmentFile=/etc/default/isc-dhcp-server
RuntimeDirectory=dhcp-server
# The leases files need to be root:dhcpd even when dropping privileges
ExecStart=/bin/sh -ec '\
    CONFIG_FILE=/etc/dhcp/dhcpd.conf; \
    rm /var/lib/dhcp/dhcpd.leases && touch /var/lib/dhcp/dhcpd.leases; \
    chown root:dhcpd /var/lib/dhcp /var/lib/dhcp/dhcpd.leases; \
    chmod 775 /var/lib/dhcp ; chmod 664 /var/lib/dhcp/dhcpd.leases; \
    if test -n "$INTERFACES" -a -z "$INTERFACESv4"; then INTERFACESv4="$INTERFACES"; fi; \
    exec dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid -cf $CONFIG_FILE $INTERFACESv4'

[Install]
WantedBy=multi-user.target

修改完之后，执行 systemctl daemon-reload 重新加载文件，在执行 systemctl restart isc-dhcp-server

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Ubuntu 配置DHCP server

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