DNSサーバをVMネットワーク上に作成する

DNSサーバの設定

sudo apt install bind9 bind9utils bind9-doc

/etc/bind/named.conf.optionsの編集

acl internal-network {
        192.168.1.0/24;
};
options {
	directory "/var/cache/bind";

	// If there is a firewall between you and nameservers you want
	// to talk to, you may need to fix the firewall to allow multiple
	// ports to talk.  See http://www.kb.cert.org/vuls/id/800113

	// If your ISP provided one or more IP addresses for stable 
	// nameservers, you probably want to use them as forwarders.  
	// Uncomment the following block, and insert the addresses replacing 
	// the all-0's placeholder.
	
	forwarders {
	 	8.8.8.8;
	};
	allow-query { localhost; internal-network; };
	//========================================================================
	// If BIND logs error messages about the root key being expired,
	// you will need to update your keys.  See https://www.isc.org/bind-keys
	//========================================================================
	dnssec-validation auto;
	//listen-on-v6 { any; };
	recursion yes;
};

/etc/bind/named.conf.localの編集

zone "mydomain.com" {
        type master;
        file "/etc/bind/db.mydomain.com";
};

/etc/bind/db.mydomain.comの編集

;
; BIND data file for local loopback interface
;
$TTL    604800
@       IN      SOA     mydomain.com. root.mydomain.com. (
                       20240421         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;
@       IN      NS      dnode
dnode   IN      A       192.168.1.100

;Host Record
node1	IN	A	192.168.1.2
node2 IN  A 192.168.1.3
node3 IN  A 192.168.1.4
node4 IN  A 192.168.1.5

bind9の再起動

sudo systemctl restart bind9

各ノードの設定

/etc/netplanにmydomain.comの自動付与を設定

... other settings ...
nameservers:
        addresses: [192.168.1.100, 8.8.8.8]
        search: [mydomain.com]

/etc/systemd/resolved.confの編集

[Resolve]
DNSStubListener=no

/etc/resolve.confのシンボリックリンクを編集

ldasudo mv /etc/resolv.conf /tmp/resolv.conf.bak
sudo ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf

systemd-resolvedの再起動

sudo systemctl restart systemd-resolved

参考ページ

https://www.alibabacloud.com/help/en/ecs/how-do-i-use-the-or-etc-or-resolv-conf-file-to-customize-dns-settings-on-an-alibaba-cloud-linux-instance

https://technologyrss.com/how-to-install-and-configure-dns-bind9-on-ubuntu-22-04-server/

https://zenn.dev/tochiman/articles/5434d4a1e40820