AWS CLIでRoute53のHosted ZoneにサブドメインのNSレコードを登録しよう

はじめに

AWS CLIを利用して、Route53のHosted ZoneにサブドメインのNSレコードを登録する。
GitHub Actionsでも利用できるように、シェルスクリプトで作成する。

スクリプト

add_ns.sh

#!/bin/bash

set -e

if [ $# != 2 ] || [ $1 = "" ] || [ $2 = "" ]; then
  echo -e "Two parameters are required

  1st - string: Hosted Domain Name on Route 53 (e.g. example.com)
  2nd - string: Subdomain Name (e.g. sub.mexample.com)

  example command
  \t sh ./add_ns.sh example.com sub.example.com"
  exit
fi

HOSTED_DOMAIN=$1
TARGET_DOMAIN=$2

echo -e "\t HOSTED_DOMAIN = ${HOSTED_DOMAIN}"
echo -e "\t TARGET_DOMAIN = ${TARGET_DOMAIN}"

RECORD_SET_ID_HOSTED_DOMAIN=$( \
  aws route53 list-hosted-zones \
  --query "HostedZones[?Name=='${HOSTED_DOMAIN}.'].Id" \
  --output text) \
&& echo -e "\t RECORD_SET_ID_HOSTED_DOMAIN = ${RECORD_SET_ID_HOSTED_DOMAIN}"

RECORD_SET_ID_TARGET_DOMAIN=$( \
  aws route53 list-hosted-zones \
  --query "HostedZones[?Name=='${TARGET_DOMAIN}.'].Id" \
  --output text) \
&& echo -e "\t RECORD_SET_ID_TARGET_DOMAIN = ${RECORD_SET_ID_TARGET_DOMAIN}"

IS_RECORD_SET=$( \
  aws route53 list-resource-record-sets \
  --hosted-zone-id ${RECORD_SET_ID_HOSTED_DOMAIN} \
  --query "ResourceRecordSets[?Name=='${TARGET_DOMAIN}.'].Name" \
  --output text \
  | wc -w) \
&& echo -e "\t IS_RECORD_SET = ${IS_RECORD_SET}"

if [ ${IS_RECORD_SET} != 0 ]; then
  echo -e  "\t it already exists"
else
  RECORDS=$( \
    aws route53 list-resource-record-sets \
    --hosted-zone-id ${RECORD_SET_ID_TARGET_DOMAIN} \
    --query "ResourceRecordSets[?Type=='NS'].ResourceRecords[]") \
  && echo -e "\t RECORDS = ${RECORDS}"

  CHANGE_ID=$( \
    aws route53 change-resource-record-sets \
    --hosted-zone-id ${RECORD_SET_ID_HOSTED_DOMAIN} \
    --change-batch \
    "{
      \"Changes\": [
        {
          \"Action\": \"CREATE\",
          \"ResourceRecordSet\": {
            \"Name\": \"${TARGET_DOMAIN}\",
            \"Type\": \"NS\",
            \"TTL\": 300,
            \"ResourceRecords\": ${RECORDS}
          }
        }
      ]
    }" \
    --query "ChangeInfo.Id" \
    --output text) \
  && echo -e "\t Change ID : ${CHANGE_ID}\n"
fi