DNS Management

Configure and manage DNS infrastructure.

AWS Route 53

Create hosted zone

aws route53 create-hosted-zone --name example.com --caller-reference $(date +%s)

Create record

aws route53 change-resource-record-sets --hosted-zone-id ZXXXXX --change-batch '{ "Changes": [{ "Action": "CREATE", "ResourceRecordSet": { "Name": "www.example.com", "Type": "A", "TTL": 300, "ResourceRecords": [{"Value": "1.2.3.4"}] } }] }'

BIND Configuration

/etc/bind/zones/example.com.db

$TTL 86400 @ IN SOA ns1.example.com. admin.example.com. ( 2024010101 ; Serial 3600 ; Refresh 1800 ; Retry 604800 ; Expire 86400 ) ; Minimum TTL

IN  NS      ns1.example.com.
IN  A       1.2.3.4

www IN A 1.2.3.4

Common Records

A - IPv4 address AAAA - IPv6 address CNAME - Alias to another domain MX - Mail server TXT - Text record (SPF, DKIM) NS - Name server

Best Practices

• Low TTL during migrations

• Implement DNSSEC

• Use multiple name servers

• Monitor DNS resolution