{Route53}Evaluate Target Health

https://dev.classmethod.jp/articles/route53-elb-healthcheck/

Route53のヘルスチェックではなく、ALBのヘルスチェックを使用できる

東京リージョン(ap-northeast-1)とオレゴン(us-west-2)にALBを作成
そのALBを送信先とするレイテンシールーティングを設定

前提: オレゴン(us-west-2)にkey1インポート済

-- 1. コマンド等のインストール

-- 1.1 aws cli version 2 インストール

curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
unzip awscliv2.zip
sudo ./aws/install

aws --version

-- 1.2 jqインストール
sudo yum -y install jq

-- 2. ALB作成 [ap-northeast-1での作業]

-- 2.1 EC2インスタンス作成 [ap-northeast-1での作業]

-- ap-northeast-1a

export AWS_DEFAULT_REGION=ap-northeast-1

vim a.sh

#!/bin/bash
yum -y update
yum -y install httpd
systemctl start httpd
systemctl enable httpd
echo $(hostname) > /var/www/html/index.html

aws ec2 run-instances \
--image-id ami-0404778e217f54308 \
--instance-type t3.nano \
--key-name key1 \
--tag-specifications 'ResourceType=instance,Tags=[{Key=Name,Value=instance01}]' \
--subnet-id subnet-11111111111111111 \
--user-data file://a.sh

aws ec2 describe-instances

-- 2.2 ロードバランサーの作成 [ap-northeast-1での作業]

aws elbv2 create-load-balancer \
--name alb01  \
--subnets subnet-11111111111111111 subnet-22222222222222222 \
--security-groups sg-33333333333333333

aws elbv2 describe-load-balancers
aws elbv2 describe-load-balancers| jq -r .LoadBalancers.LoadBalancerArn

-- 2.3 ターゲットグループの作成 [ap-northeast-1での作業]

aws elbv2 create-target-group \
--name target01 \
--protocol HTTP \
--port 80 \
--vpc-id vpc-44444444444444444 \
--ip-address-type ipv4 \
--target-type instance

aws elbv2 describe-target-groups
aws elbv2 describe-target-groups| jq -r .TargetGroups.TargetGroupArn

aws elbv2 describe-target-group-attributes \
--target-group-arn arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:targetgroup/target01/5555555555555555

aws elbv2 register-targets \
--target-group-arn arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:targetgroup/target01/5555555555555555  \
--targets Id=i-66666666666666666

aws elbv2 describe-target-health \
--target-group-arn arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:targetgroup/target01/5555555555555555

-- 2.4 ALBリスナーの作成 [ap-northeast-1での作業]

aws elbv2 create-listener \
--load-balancer-arn arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:loadbalancer/app/alb01/7777777777777777 \
--protocol HTTP \
--port 80  \
--default-actions Type=forward,TargetGroupArn=arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:targetgroup/target01/5555555555555555

aws elbv2 describe-listeners \
--load-balancer-arn arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:loadbalancer/app/alb01/7777777777777777

aws elbv2 describe-listeners \
--load-balancer-arn arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:loadbalancer/app/alb01/7777777777777777 | jq -r .Listeners.ListenerArn

-- 3. ALB作成 [us-west-2での作業]

-- 3.1 EC2インスタンス作成 [us-west-2での作業]

-- us-west-2a
export AWS_DEFAULT_REGION=us-west-2

vim a.sh

#!/bin/bash
yum -y update
yum -y install httpd
systemctl start httpd
systemctl enable httpd
echo $(hostname) > /var/www/html/index.html

aws ec2 run-instances \
--image-id ami-098e42ae54c764c35 \
--instance-type t3.nano \
--key-name key1 \
--tag-specifications 'ResourceType=instance,Tags=[{Key=Name,Value=instance01}]' \
--subnet-id subnet-88888888888888888 \
--user-data file://a.sh

aws ec2 describe-instances

-- 3.2 ロードバランサーの作成 [us-west-2での作業]

aws elbv2 create-load-balancer \
--name alb01  \
--subnets subnet-88888888888888888 subnet-00000000000000000 \
--security-groups sg-00fefcad5bf19065a

aws elbv2 describe-load-balancers
aws elbv2 describe-load-balancers| jq -r .LoadBalancers.LoadBalancerArn

-- 3.3 ターゲットグループの作成 [us-west-2での作業]

aws elbv2 create-target-group \
--name target01 \
--protocol HTTP \
--port 80 \
--vpc-id vpc-aaaaaaaaaaaaaaaaa \
--ip-address-type ipv4 \
--target-type instance

aws elbv2 describe-target-groups
aws elbv2 describe-target-groups| jq -r .TargetGroups.TargetGroupArn

aws elbv2 describe-target-group-attributes \
--target-group-arn arn:aws:elasticloadbalancing:us-west-2:999999999999:targetgroup/target01/bbbbbbbbbbbbbbbb

aws elbv2 register-targets \
--target-group-arn arn:aws:elasticloadbalancing:us-west-2:999999999999:targetgroup/target01/bbbbbbbbbbbbbbbb  \
--targets Id=i-ccccccccccccccccc

aws elbv2 describe-target-health \
--target-group-arn arn:aws:elasticloadbalancing:us-west-2:999999999999:targetgroup/target01/bbbbbbbbbbbbbbbb

-- 3.4 ALBリスナーの作成 [us-west-2での作業]

aws elbv2 create-listener \
--load-balancer-arn arn:aws:elasticloadbalancing:us-west-2:999999999999:loadbalancer/app/alb01/dddddddddddddddd \
--protocol HTTP \
--port 80  \
--default-actions Type=forward,TargetGroupArn=arn:aws:elasticloadbalancing:us-west-2:999999999999:targetgroup/target01/bbbbbbbbbbbbbbbb

aws elbv2 describe-listeners \
--load-balancer-arn arn:aws:elasticloadbalancing:us-west-2:999999999999:loadbalancer/app/alb01/dddddddddddddddd

aws elbv2 describe-listeners \
--load-balancer-arn arn:aws:elasticloadbalancing:us-west-2:999999999999:loadbalancer/app/alb01/dddddddddddddddd | jq -r .Listeners.ListenerArn

-- 4. ホステッドゾーンの確認
aws route53 list-hosted-zones

-- 5. レイテンシールーティング

※ALBのHostedZoneIdは下記で取得

aws elbv2 describe-load-balancers| jq -r .LoadBalancers[].CanonicalHostedZoneId

vim b.json

{
  "Comment": "CREATE/DELETE/UPSERT a record ",
  "Changes": [
    { "Action": "UPSERT",
      "ResourceRecordSet": { "Name": "www.example.com.",
                             "Type": "A",
                             "SetIdentifier": "rec1",
                             "Region": "ap-northeast-1",
                             "AliasTarget": {
                                 "HostedZoneId": "AAAAAAAAAAAAAA",
                                 "DNSName": "dualstack.alb01-111111111.ap-northeast-1.elb.amazonaws.com.",
                                 "EvaluateTargetHealth": true
                             }
                           }
    },
    { "Action": "UPSERT",
      "ResourceRecordSet": { "Name": "www.example.com.",
                             "Type": "A",
                             "SetIdentifier": "rec2",
                             "Region": "us-west-2",
                             "AliasTarget": {
                                "HostedZoneId": "BBBBBBBBBBBBB",
                                "DNSName": "dualstack.alb01-2222222222.us-west-2.elb.amazonaws.com.",
                                "EvaluateTargetHealth": true
                             }
        }
    }
  ]
}

aws route53 change-resource-record-sets \
--hosted-zone-id XXXXXXXXXXXXXXXXXXXXX \
--change-batch file://b.json

aws route53 list-resource-record-sets \
--hosted-zone-id XXXXXXXXXXXXXXXXXXXXX

-- 6. 動作確認

curl http://www.example.com/index.html

東京リージョンのEC2を停止してオレゴンリージョンにフェイルオーバを確認

フェイルオーバするまで、503 Service Temporarily Unavailableとなる

-- 7. クリーンアップ

-- Route53レコードの削除

export AWS_DEFAULT_REGION=us-west-2
-- ALBリスナーの削除 [us-west-2での作業]

aws elbv2 describe-listeners \
--load-balancer-arn arn:aws:elasticloadbalancing:us-west-2:999999999999:loadbalancer/app/alb01/dddddddddddddddd

aws elbv2 delete-listener \
--listener-arn arn:aws:elasticloadbalancing:us-west-2:999999999999:listener/app/alb01/dddddddddddddddd/iiiiiiiiiiiiiiii

-- ターゲットグループの削除 [us-west-2での作業]

aws elbv2 describe-target-groups

aws elbv2 deregister-targets \
--target-group-arn arn:aws:elasticloadbalancing:us-west-2:999999999999:targetgroup/target01/bbbbbbbbbbbbbbbb \
--targets Id=i-ccccccccccccccccc

aws elbv2 delete-target-group \
--target-group-arn arn:aws:elasticloadbalancing:us-west-2:999999999999:targetgroup/target01/bbbbbbbbbbbbbbbb

-- ロードバランサーの削除 [us-west-2での作業]

aws elbv2 describe-load-balancers

aws elbv2 delete-load-balancer \
--load-balancer-arn arn:aws:elasticloadbalancing:us-west-2:999999999999:loadbalancer/app/alb01/dddddddddddddddd

-- EC2インスタンスの削除 [us-west-2での作業]

aws ec2 describe-instances

aws ec2 terminate-instances --instance-ids i-ccccccccccccccccc

export AWS_DEFAULT_REGION=ap-northeast-1

-- ALBリスナーの削除 [ap-northeast-1での作業]

aws elbv2 describe-listeners \
--load-balancer-arn arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:loadbalancer/app/alb01/7777777777777777

aws elbv2 delete-listener \
--listener-arn arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:listener/app/alb01/7777777777777777/jjjjjjjjjjjjjjjj

-- ターゲットグループの削除 [ap-northeast-1での作業]

aws elbv2 describe-target-groups

aws elbv2 deregister-targets \
--target-group-arn arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:targetgroup/target01/5555555555555555 \
--targets Id=i-66666666666666666

aws elbv2 delete-target-group \
--target-group-arn arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:targetgroup/target01/5555555555555555

-- ロードバランサーの削除 [ap-northeast-1での作業]

aws elbv2 describe-load-balancers

aws elbv2 delete-load-balancer \
--load-balancer-arn arn:aws:elasticloadbalancing:ap-northeast-1:999999999999:loadbalancer/app/alb01/7777777777777777

-- EC2インスタンスの削除 [ap-northeast-1での作業]

aws ec2 describe-instances

aws ec2 terminate-instances --instance-ids i-66666666666666666