RockyLinuxでのDNSサーバ構築

概要

Rocky LinuxでBINDを構築する場合の設定例を記載しています。

環境

#	ソフトウェア	バージョン
1	Rocky Linux	9.4

前提

• インターネットへの接続が可能

手順

1.パッケージのインストール

dnf install -y bind

2.firewalldの停止(任意)

systemctl disable --now firewalld

3./etc/named.conf

赤字が修正箇所となります。

//
// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//

options {
        listen-on port 53 { any; };
        listen-on-v6 port 53 { ::1; };
        directory       "/var/named";
        dump-file       "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
        secroots-file   "/var/named/data/named.secroots";
        recursing-file  "/var/named/data/named.recursing";
        allow-query     { localhost; any; };

        /*
         - If you are building an AUTHORITATIVE DNS server, do NOT enable recursion.
         - If you are building a RECURSIVE (caching) DNS server, you need to enable
           recursion.
         - If your recursive DNS server has a public IP address, you MUST enable access
           control to limit queries to your legitimate users. Failing to do so will
           cause your server to become part of large scale DNS amplification
           attacks. Implementing BCP38 within your network would greatly
           reduce such attack surface
        */
        recursion yes;

        dnssec-validation yes;

        managed-keys-directory "/var/named/dynamic";
        geoip-directory "/usr/share/GeoIP";

        pid-file "/run/named/named.pid";
        session-keyfile "/run/named/session.key";

        /* https://fedoraproject.org/wiki/Changes/CryptoPolicy */
        include "/etc/crypto-policies/back-ends/bind.config";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

zone "." IN {
        type hint;
        file "named.ca";
};

include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";


zone "lab.internal" IN {
        type master;
        file "lab.internal";
        allow-update { none; };
};

zone "2.168.192.in-addr.arpa" IN{
        type master;
        file "2.168.192.in-addr.arpa.rev";
        allow-update { none; };
};

4. /var/named/lab.internal

ファイルを新規作成します。

$TTL 86400
@               IN      SOA linux.lab.internal. root.srv.world. (
                        2024092201 ;
                        3600       ;
                        1800       ;
                        604800     ;
                        86400      ;
)

                IN      NS      linux.lab.internal.
linux           IN      A       192.168.2.XXX

5. /var/named/2.168.192.in-addr.arpa.rev

ファイルを新規作成します。

$TTL 86400
@               IN      SOA linux.lab.internal. root.lab.internal. (
                        2024092201 ;
                        3600       ;
                        1800       ;
                        604800     ;
                        86400      ;
)

                IN      NS      linux.lab.internal.
XXX             IN      PTR     linux.lab.internal.