hot set dns ubuntu 20.04 code example

Example 1: ubunt server 20.04 dns tuto

;
;
;
$TTL    604800
@       IN      SOA     ns.domain-name.com. admin.domain-name.com. (
                              2        ; Serial
                         604800        ; Refresh
                          86400        ; Retry
                        2419200        ; Expire
                         604800 )      ; Negative Cache TTL
;
@       IN      NS      ns.domain-name.com.
@       IN      A       10.1.1.1
ns      IN      A       10.1.1.9
ns2     IN      A       10.1.1.10
mx      IN      A       10.1.1.15

Example 2: ubuntu 20.04 how to check dns server

systemd-resolve --status | grep Current