github.com/lfch/etcd-io/tests/v3@v3.0.0-20221004140520-eac99acd3e9d/manual/docker-dns/rdns.zone (about)

     1  $TTL    86400
     2  @   IN  SOA  etcdns.local. root.etcdns.local. (
     3               100500     ; Serial
     4               604800     ; Refresh
     5                86400     ; Retry
     6              2419200     ; Expire
     7                86400 )   ; Negative Cache TTL
     8      IN  NS  ns.etcdns.local.
     9      IN  A   127.0.0.1
    10  
    11  1 IN PTR m1.etcd.local.
    12  1 IN PTR m2.etcd.local.
    13  1 IN PTR m3.etcd.local.