AWS — Route 53

What is Route 53?

Scalable DNS web service for domain registration and routing.

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 Z1234567890 \
  --change-batch '{
    "Changes": [{
      "Action": "CREATE",
      "ResourceRecordSet": {
        "Name": "www.example.com",
        "Type": "A",
        "TTL": 300,
        "ResourceRecords": [{"Value": "1.2.3.4"}]
      }
    }]
  }'

Record types

Type	Purpose
A	IPv4 address
AAAA	IPv6 address
CNAME	Alias to another name
MX	Mail exchange
TXT	Text record
Alias	AWS resource alias

Health checks

aws route53 create-health-check \
  --caller-reference $(date +%s) \
  --health-check-config \
    IPAddress=1.2.3.4,Port=80,Type=HTTP,ResourcePath=/

Failover routing

{
  "Changes": [{
    "Action": "CREATE",
    "ResourceRecordSet": {
      "Name": "www.example.com",
      "Type": "A",
      "SetIdentifier": "primary",
      "Failover": "PRIMARY",
      "AliasTarget": {
        "HostedZoneId": "Z1234567890",
        "DNSName": "elb.amazonaws.com",
        "EvaluateTargetHealth": true
      }
    }
  }]
}

Domain registration

aws route53 domains register-domain \
  --domain-name example.com \
  --duration-in-years 1 \
  --admin-contact ...

Best practices

1. Use health checks
2. Set appropriate TTL
3. Use alias records for AWS resources
4. Enable DNSSEC

Mini Practice

1. Create a hosted zone
2. Add an A record
3. Set up health checks
4. Configure failover routing

Up Next

Continue with ECS - Container Service.