Caching only DNS

Installation auf Ubuntu 24.04

1. Prüfen ob systemd-resolved bereits aktiv ist:

systemctl status systemd-resolved

2. Konfiguration anpassen:

sudo vim /etc/systemd/resolved.conf

3. Diese Einstellungen aktivieren:

[Resolve]
DNS=8.8.8.8 1.1.1.1
Cache=yes
DNSStubListener=yes

4. Service neu starten:

sudo systemctl restart systemd-resolved
sudo systemctl enable systemd-resolved

5. DNS-Konfiguration aktualisieren:

sudo ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf

Installation auf Ubuntu 16.04

> apt install bind9 bind9utils

/etc/default/bind9

# run resolvconf?
RESOLVCONF=no
 
# startup options for the server
OPTIONS="-4 -u bind"

/etc/bind/named.conf.options

//
// Caching only DNS Server
// https://fxdata.cloud/tutorials/configure-bind-as-a-caching-or-forwarding-dns-server-on-ubuntu-14-04
//
//acl goodclients {
//      10.10.0.9;
//      127.0.1.1;
//      127.0.0.1;
//      localhost;
//      localnets;
//};
 
acl goodclient {
    localhost;
    localnets;
};
 
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 {
        //      0.0.0.0;
        // };
 
        recursion yes;
 
//      allow-query {
//              goodclients;
//      };
 
        forwarders {
                8.8.8.8;    // Google DNS 1
                4.4.4.4;    // Google DNS 2
                1.1.1.1;    // popular DNS
        };
 
        forward only;
 
        //========================================================================
        // 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;
 
        dnssec-enable yes;
        dnssec-validation yes;
 
        auth-nxdomain no;    # conform to RFC1035
        //listen-on-v6 { any; };
        listen-on-v6 { none; };
 
        #----------------------------------------------------------------------#
 
        query-source address * port 53;
 
        listen-on {
                127/8;
        };
 
        allow-query { goodclient; };
};

> service bind9 restart

Installation auf Ubuntu 14.04

> apt install bind9 bind9utils

/etc/default/bind9

# run resolvconf?
RESOLVCONF=no
 
# startup options for the server
OPTIONS="-4 -u bind"

/etc/bind/named.conf.options

//
// Caching only DNS Server
// https://fxdata.cloud/tutorials/configure-bind-as-a-caching-or-forwarding-dns-server-on-ubuntu-14-04
//
//acl goodclients {
//      10.10.0.9;
//      127.0.1.1;
//      127.0.0.1;
//      localhost;
//      localnets;
//};
 
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 {
        //      0.0.0.0;
        // };
 
        recursion yes;
 
//      allow-query {
//              goodclients;
//      };
 
        forwarders {
                8.8.8.8;
        };
 
        //forward only;
 
        //========================================================================
        // 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;
 
        dnssec-enable yes;
        dnssec-validation yes;
 
        auth-nxdomain no;    # conform to RFC1035
        //listen-on-v6 { any; };
        listen-on-v6 { none; };
 
        #----------------------------------------------------------------------#
 
        query-source address * port 53;
 
        listen-on {
                127/8;
        };
};

> service bind9 restart