{Alibaba Cloud DNS} 重み付きラウンドロビン

https://www.alibabacloud.com/help/ja/alibaba-cloud-dns-jp

https://www.alibabacloud.com/help/en/dns/details#topic-2035883
https://www.alibabacloud.com/help/en/dns/api-alidns-2015-01-09-overview
https://www.alibabacloud.com/help/ja/alibaba-cloud-dns-jp/latest/dns-load-balancing

下記条件で $0.58
Public DNS
Authoritative DNS resolution
Personal Edition
No DNS Protection
1 Month

-- 1. ECSインスタンスでwwwサーバ2台作成

cat <<-'EOF' | base64
#!/bin/bash
yum install -y httpd
systemctl start httpd
systemctl enable httpd
echo $(uname -n) > /var/www/html/index.html
EOF

echo "IyEvYmluL2Jhc2gKeXVtIGluc3RhbGwgLXkgaHR0cGQKc3lzdGVtY3RsIHN0YXJ0IGh0dHBkCnN5c3RlbWN0bCBlbmFibGUgaHR0cGQKZWNobyAkKHVuYW1lIC1uKSA+IC92YXIvd3d3L2h0bWwvaW5kZXguaHRtbAo=" | base64 -d

cat <<-'EOF' > variables.tf

locals {
availability_zone = "ap-northeast-1a"
}

variable "instance_type" {
description = "instance_type"
type = string
default = "ecs.t5-lc2m1.nano"
}

variable "image_id" {
description = "image_id"
type = string
default = "aliyun_2_1903_x64_20G_alibase_20231221.vhd"
}

EOF

cat <<-'EOF' > main.tf

terraform {
required_version = ">= 1.0.0, < 2.0.0"
required_providers {
alicloud = {
source = "aliyun/alicloud"
version = "= 1.217.0"
}
}
}

provider "alicloud" {
region = "ap-northeast-1"
}

resource "alicloud_vpc" "vpc01" {
vpc_name = "vpc01"
description = "vpc01"
cidr_block = "10.2.0.0/16"
}

resource "alicloud_vswitch" "sw01" {
vswitch_name = "sw01"
description = "sw01"
vpc_id = alicloud_vpc.vpc01.id
cidr_block = "10.2.1.0/24"
zone_id = local.availability_zone
}

resource "alicloud_security_group" "sg01" {
name = "sg01"
description = "sg01"
vpc_id = alicloud_vpc.vpc01.id
security_group_type = "normal"
}

resource "alicloud_security_group_rule" "sg0101" {
type = "ingress"
ip_protocol = "tcp"
port_range = "80/80"
security_group_id = alicloud_security_group.sg01.id
nic_type = "intranet"
policy = "accept"
priority = 10
cidr_ip = "0.0.0.0/0"
description = "sg0101"
}

resource "alicloud_vpc_ipv4_gateway" "gw01" {
ipv4_gateway_name = "gw01"
ipv4_gateway_description = "gw01"
vpc_id = alicloud_vpc.vpc01.id
enabled = true
}

# ルートテーブルへvSwitchの関連付け
resource "alicloud_route_table_attachment" "sw01_rt01" {
vswitch_id = alicloud_vswitch.sw01.id
route_table_id = alicloud_vpc.vpc01.route_table_id
}

# ルートテーブルへカスタムルート追加
resource "alicloud_route_entry" "rt0101" {
name = "rt0101"
route_table_id = alicloud_vpc.vpc01.route_table_id
destination_cidrblock = "0.0.0.0/0"
nexthop_type = "Ipv4Gateway"
nexthop_id = alicloud_vpc_ipv4_gateway.gw01.id
}

resource "alicloud_instance" "ecs01" {
image_id = var.image_id
instance_type = var.instance_type
security_groups = [alicloud_security_group.sg01.id]
instance_name = "ecs01"
system_disk_category = "cloud_ssd"
system_disk_name = "ecs01"
system_disk_size = 20
description = "ecs01"
internet_charge_type = "PayByBandwidth"
internet_max_bandwidth_out = 0
host_name = "ecs01"
vswitch_id = alicloud_vswitch.sw01.id
instance_charge_type = "PostPaid"
key_name = "alibabakey01"
deletion_protection = false
credit_specification = "Standard"
user_data = "IyEvYmluL2Jhc2gKeXVtIGluc3RhbGwgLXkgaHR0cGQKc3lzdGVtY3RsIHN0YXJ0IGh0dHBkCnN5c3RlbWN0bCBlbmFibGUgaHR0cGQKZWNobyAkKHVuYW1lIC1uKSA+IC92YXIvd3d3L2h0bWwvaW5kZXguaHRtbAo="
}

resource "alicloud_eip_address" "eip01" {
address_name = "eip01"
bandwidth = 1
deletion_protection = false
description = "eip01"
internet_charge_type = "PayByTraffic"
isp = "BGP"
payment_type = "PayAsYouGo"
netmode = "public"
}

# インスタンスとEIPの関連付け
resource "alicloud_eip_association" "ecs01_eip01" {
instance_id = alicloud_instance.ecs01.id
allocation_id = alicloud_eip_address.eip01.id
}

resource "alicloud_instance" "ecs02" {
image_id = var.image_id
instance_type = var.instance_type
security_groups = [alicloud_security_group.sg01.id]
instance_name = "ecs02"
system_disk_category = "cloud_ssd"
system_disk_name = "ecs02"
system_disk_size = 20
description = "ecs02"
internet_charge_type = "PayByBandwidth"
internet_max_bandwidth_out = 0
host_name = "ecs02"
vswitch_id = alicloud_vswitch.sw01.id
instance_charge_type = "PostPaid"
key_name = "alibabakey01"
deletion_protection = false
credit_specification = "Standard"
user_data = "IyEvYmluL2Jhc2gKeXVtIGluc3RhbGwgLXkgaHR0cGQKc3lzdGVtY3RsIHN0YXJ0IGh0dHBkCnN5c3RlbWN0bCBlbmFibGUgaHR0cGQKZWNobyAkKHVuYW1lIC1uKSA+IC92YXIvd3d3L2h0bWwvaW5kZXguaHRtbAo="
}

resource "alicloud_eip_address" "eip02" {
address_name = "eip02"
bandwidth = 1
deletion_protection = false
description = "eip02"
internet_charge_type = "PayByTraffic"
isp = "BGP"
payment_type = "PayAsYouGo"
netmode = "public"
}

# インスタンスとEIPの関連付け
resource "alicloud_eip_association" "ecs02_eip02" {
instance_id = alicloud_instance.ecs02.id
allocation_id = alicloud_eip_address.eip02.id
}

EOF

cat <<-'EOF' > outputs.tf

output "vpc01_id" {
value = alicloud_vpc.vpc01.id
description = "vpc01.id"
}

output "sw01_id" {
value = alicloud_vswitch.sw01.id
description = "sw01.id"
}

output "sg01_id" {
value = alicloud_security_group.sg01.id
description = "sg01.id"
}

output "ecs01_id" {
value = alicloud_instance.ecs01.id
description = "ecs01.id"
}

output "ecs02_id" {
value = alicloud_instance.ecs02.id
description = "ecs02.id"
}

EOF

terraform init
terraform fmt
terraform -version

terraform plan

terraform apply -auto-approve

curl http://192.0.2.1
curl http://192.0.2.2

-- 2. インスタンス購入

画面から実施

Public DNS
Authoritative DNS resolution
Personal Edition
No DNS Protection
1 Month

aliyun alidns DescribeDnsProductInstances

-- 3. ドメイン名の追加

aliyun alidns AddDomain \
--DomainName example.com

aliyun alidns DescribeDomains

-- 4. インスタンスとドメイン名のバインド

aliyun alidns BindInstanceDomains \
--DomainNames example.com \
--InstanceId dns-sg-11111111111

aliyun alidns DescribeInstanceDomains \
--InstanceId dns-sg-11111111111

-- 5. DNSレコード追加

aliyun alidns AddDomainRecord \
--DomainName example.com \
--RR www \
--Type A \
--Value 192.0.2.1 \
--TTL 600

aliyun alidns AddDomainRecord \
--DomainName example.com \
--RR www \
--Type A \
--Value 192.0.2.2 \
--TTL 600

aliyun alidns DescribeDomainRecords \
--DomainName example.com

-- 6. ラウンドロビン設定

aliyun alidns SetDNSSLBStatus \
--SubDomain www.example.com

aliyun alidns DescribeDNSSLBSubDomains \
--DomainName example.com

-- 7. DNSサービスプロバイダーの管理コンソールで、下記NSレコードを追加

www.example.com vip1.alidns.com
www.example.com vip2.alidns.com

TTL=60秒

-- 8. 動作確認

dig www.example.com @vip1.alidns.com
dig www.example.com @vip2.alidns.com
dig www.example.com

nslookup www.example.com vip1.alidns.com
nslookup www.example.com vip2.alidns.com
nslookup www.example.com

ipconfig /flushdns

curl http://www.example.com

-- 9. クリーンアップ

-- DNSレコード削除

aliyun alidns DescribeDomainRecords \
--DomainName example.com

aliyun alidns DeleteDomainRecord \
--RecordId 111111111111111111

-- インスタンスとドメイン名のアンバインド

aliyun alidns DescribeInstanceDomains \
--InstanceId dns-sg-11111111111

aliyun alidns UnbindInstanceDomains \
--DomainNames example.com \
--InstanceId dns-sg-11111111111

-- ドメイン名の削除

aliyun alidns DescribeDomains

aliyun alidns DeleteDomain \
--DomainName example.com

DNSサービスプロバイダーの管理コンソールで、追加したNSレコードの削除

terraform destroy -auto-approve