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Configure DNS Resolvers

Nine provides three DNS resolvers for servers in our network.

Netplan​

Add the DNS resolvers under nameservers.addresses in your Netplan configuration:

/etc/netplan/55-interfaces.yaml
bonds:
  bond0:
    nameservers:
      addresses:
        - 217.150.241.5
        - 217.150.242.21
        - 94.230.209.182
        - 2a02:419:1002::5
        - 2a02:418:4005::21
        - 2a02:418:1101:17::6
      search:
        - nine.ch

Before applying the Netplan configuration, test it to ensure there are no syntax errors or network issues:

netplan try

If the test was successful and the configuration hasn't been applied yet using netplan try, apply it now:

netplan apply

For more information, see: man netplan

systemd-resolved​

If you're using systemd-resolved, use the following template:

/etc/systemd/resolved.conf
[Resolve]
DNS=94.230.209.182 217.150.242.21 217.150.241.5 2a02:419:1002::5 2a02:418:4005::21 2a02:418:1101:17::6
LLMNR=no
MulticastDNS=no
Cache=no
DNSStubListener=yes

resolv.conf​

Replace your /etc/resolv.conf with the following template:

/etc/resolv.conf
nameserver 217.150.241.5
nameserver 217.150.242.21
nameserver 94.230.209.182
nameserver 2a02:419:1002::5
nameserver 2a02:418:4005::21
nameserver 2a02:418:1101:17::6