Cấu hình DHCP server - AdminTalk

IrimiNage

Cấu hình DHCP server

1. Soạn file cấu hình /etc/dhcpd.conf

Code:

ddns-update-style interim;
    ignore client-updates;

    subnet 172.16.0.0 netmask 255.240.0.0 {
    # default gateway
    option routers 172.31.255.254;

    option subnet-mask 255.240.0.0;
    option nis-domain "nis-domain";
    option domain-name "domain.name";
    option domain-name-servers ns1.domain.name, ns2.domain.name;
    # ntp server, nếu có
    # option ntp-servers 172.16.0.2;

    # dành 100 địa chỉ IP cho DHCP client
    range dynamic-bootp 172.30.255.1 172.30.255.100;
    default-lease-time 7200;
    max-lease-time 18000;

    # những máy luôn nhận IP cố định
    host kiemtra {
    hardware ethernet 08:00:20:x:x:x:x;
    fixed-address 172.31.0.1;
    }
    host testtest {
    hardware ethernet 00:03:93:x:x:x:x;
    fixed-address 172.31.0.2;
    option host-name "testtest";
    }
    }

2. Khởi động dhcpd

Code:

# /etc/init.d/dhcpd start

Ví dụ về script khởi động /etc/init.d/dhcpd (của FC1)

Code:

#!/bin/sh
    #
    # dhcpd This script takes care of starting and stopping
    # dhcpd.
    #
    # chkconfig: - 65 35
    # description: dhcpd provide access to Dynamic Host Control Protocol.

    # Source function library.
    . /etc/rc.d/init.d/functions

    # Source networking configuration.
    . /etc/sysconfig/network
    . /etc/sysconfig/dhcpd

    # Check that networking is up.
    [ ${NETWORKING} = "no" ] && exit 0

    [ -f /usr/sbin/dhcpd ] || exit 0
    [ -f /etc/dhcpd.conf ] || exit 0
    [ -f /var/lib/dhcp/dhcpd.leases ] || touch /var/lib/dhcp/dhcpd.leases

    RETVAL=0
    prog="dhcpd"

    configtest()
    {
    local retval TEMP=/tmp/dhcpd$$.err

    /usr/sbin/dhcpd -t 2>$TEMP
    retval=$?
    if [ $retval -ne 0 ]
    then
    cat $TEMP
    rm -f $TEMP
    fi

    return $retval
    }

    start() {
    # Start daemons.
    echo -n $"Starting $prog: "
    daemon /usr/sbin/dhcpd ${DHCPDARGS}
    RETVAL=$?
    echo
    [ $RETVAL -eq 0 ] && touch /var/lock/subsys/dhcpd
    return $RETVAL
    }

    stop() {
    # Stop daemons.
    echo -n $"Shutting down $prog: "
    killproc dhcpd
    RETVAL=$?
    echo
    [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/dhcpd
    return $RETVAL
    }

    # See how we were called.
    case "$1" in
    start)
    start
    ;;
    stop)
    stop
    ;;
    restart|reload)
    configtest || exit $?
    stop
    start
    RETVAL=$?
    ;;
    condrestart)
    if [ -f /var/lock/subsys/dhcpd ]; then
    stop
    start
    RETVAL=$?
    fi
    ;;
    configtest)
    configtest
    RETVAL=$?
    ;;
    status)
    status dhcpd
    RETVAL=$?
    ;;
    *)
    echo $"Usage: $0 {start|stop|restart|condrestart|configtest|status}"
    exit 1
    esac

    exit $RETVAL

Tham khảo

1. /usr/share/doc/dhcp-x.x.x/dhcpd.conf.sample
2. man dhcpd.conf

(Nguồn: HVA)

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