Export Route53 records and create tf file to use with module https://github.com/terraform-aws-modules/terraform-aws-route53/tree/master/modules/records

export-records-terraform.sh

#! /bin/bash

# Usage: ./export-records-terraform.sh <zone_name>
# Example: ./export-records-terraform.sh example.com
# Dependencies: jq, aws-cli

# This script retrieves all DNS records from AWS Route53 DNS zone
# and format file compatible with Terraform Module
# https://github.com/terraform-aws-modules/terraform-aws-route53/blob/master/examples/complete/main.tf

if [ -z "$1" ]; then
  echo "Usage: ./export-records-terraform.sh <zone_name>"
  exit 1
fi

zone_name=$1
echo ">> Retrieving DNS records from zone ${zone_name}..."

# Get zone slug from zone name
zone_slug=$(echo ${zone_name} | tr '.' '-')

# Get DNS zone current data from AWS
zone="$(aws route53 list-hosted-zones | jq '.HostedZones[] | select (.Name=="'${zone_name}'.")')"
zone_id=$(echo ${zone} | jq -r '.Id' | sed 's/\/hostedzone\///')

# Clean the file before writing new data
rm -f dns-zone-${zone_name}.tf

cat << EOF >> dns-zone-${zone_name}.tf
module "records" {
  source = "terraform-aws-modules/route53/aws//modules/records"
  version = "~> 4.0"

  zone_name = "${zone_name}"

  records = [
EOF

# Retrieve all regular records (not alias) from DNS zone and write them down to terraform file
IFS=$'\n'
for dns_record in $(aws route53 list-resource-record-sets --hosted-zone-id "${zone_id}" | jq -c '.ResourceRecordSets[] | select(has("AliasTarget") | not)');do
  name="$(echo ${dns_record} | jq -r '.Name' | sed 's/\.'${zone_name}'.//g')"  
  type="$(echo ${dns_record} | jq -r '.Type')"
  name_slug="$(echo ${type}-${name} | sed -E 's/[\._\ ]+/-/g' | sed -E 's/(^-|-$)//g')"
  ttl="$(echo ${dns_record} | jq -r '.TTL')"
  records="$(echo ${dns_record} | jq -cr '.ResourceRecords' | jq '.[].Value' | sed 's/$/,/')"
  records="$(echo ${records} | sed 's/,$//')"

  # if type equal to SOA or NS, skip the record
  if [ "${type}" == "SOA" ] || [ "${type}" == "NS" ]; then
    continue
  fi

  cat << EOF >> dns-zone-${zone_name}.tf
    {
      name    = "${name}"
      type    = "${type}"
      ttl     = "${ttl}"
      records = [${records}]
    },
EOF
done

# Retrieve all alias records from DNS zone and write them down to terraform file
IFS=$'\n'
for dns_record in $(aws route53 list-resource-record-sets --hosted-zone-id "${zone_id}" | jq -c '.ResourceRecordSets[] | select(has("AliasTarget"))');do
  name="$(echo ${dns_record} | jq -r '.Name' | sed 's/\.'${zone_name}'.//g')"
  type="$(echo ${dns_record} | jq -r '.Type')"
  name_slug="$(echo ${type}-${name} | sed -E 's/[\._\ ]+/-/g' | sed -E 's/(^-|-$)//g')"
  alias_name="$(echo ${dns_record} | jq -cr '.AliasTarget' | jq -r '.DNSName')"
  alias_zone_id="$(echo ${dns_record} | jq -cr '.AliasTarget' | jq -r '.HostedZoneId')"

  cat << EOF >> dns-zone-${zone_name}.tf
    {
      name    = "${name}"
      type    = "${type}"
      alias = {
        name    = "${alias_name}"
        zone_id = "${alias_zone_id}"
      }
    },
EOF
done

cat << EOF >> dns-zone-${zone_name}.tf
  ]
}
EOF

echo ">> Terraform file dns-zone-${zone_name}.tf created successfully"