ALBの新機能 Target Optimizer による同時接続数の制御を試してみた

#!/bin/bash
# 1. システムパッケージを最新化
yum update -y

# 2. Dockerをインストール
yum install -y docker

# 3. Dockerサービスを起動・有効化
systemctl start docker
systemctl enable docker

# 4. Target Optimizer agentイメージをダウンロード
docker pull public.ecr.aws/aws-elb/target-optimizer/target-control-agent:latest

# 5. Node.jsアプリケーションのディレクトリを作成
mkdir -p /app

# 6. 遅延可能なNode.jsアプリケーションを作成（クエリパラメータ ?delay=<ms> で遅延時間を指定）
cat > /app/app.js << 'EOF'
require('http').createServer(async (req, res) => {
  const delay = parseInt(new URL(req.url, 'http://localhost').searchParams.get('delay')) || 0;
  if (delay > 0) await new Promise(r => setTimeout(r, delay));
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end(`OK (${delay}ms delay)\n`);
}).listen(8080, () => console.log('Server running on port 8080'));
EOF

# 7. Dockerfileを作成
cat > /app/Dockerfile << 'EOF'
FROM node:alpine
COPY app.js .
CMD ["node", "app.js"]
EOF

# 8. Dockerイメージをビルド
cd /app && docker build -t delay-app .

# 9. Node.jsアプリケーションコンテナを起動
docker run -d \
  --name delay-app \
  --restart unless-stopped \
  --network host \
  delay-app

# 10. Target Optimizer agentコンテナを起動
docker run -d \
  --name target-optimizer-agent \
  --restart unless-stopped \
  --network host \
  -e TARGET_CONTROL_DATA_ADDRESS=0.0.0.0:80 \
  -e TARGET_CONTROL_CONTROL_ADDRESS=0.0.0.0:3000 \
  -e TARGET_CONTROL_DESTINATION_ADDRESS=127.0.0.1:8080 \
  -e TARGET_CONTROL_MAX_CONCURRENCY=1 \
  public.ecr.aws/aws-elb/target-optimizer/target-control-agent:latest

aws elbv2 create-target-group \
  --name optimized-tg \
  --protocol HTTP \
  --port 80 \
  --vpc-id <VPC-ID> \
  --target-control-port 3000 \ 
  --region ap-northeast-1

# --target-control-port でエージェントとの通信ポートを指定

http 2025-11-21T16:10:02.724784Z app/alb-XXXXX/a7c2180283d10881 203.xx.xx.xx:53426 172.31.24.14:80 0.000
1.004 0.000 200 200 144 163 "GET http://my-alb-XXXXX.ap-northeast-1.elb.amazonaws.com:80/?delay=1000 HTTP
/1.1" "curl/8.11.1" - - arn:aws:elasticloadbalancing:ap-northeast-1:123456789012:targetgroup/optimized-tg/
41e7338699cf44e9 "Root=1-69208ed9-4b1b24d81a741acd3b4a42dd" "-" "-" 0 2025-11-21T16:10:01.720000Z 
"forward" "-" "-" "172.31.24.14:80" "200" "-" "-" TID_7290691baf7245469508aa6a42bd733c "-" "-" "-"

http 2025-11-21T16:10:01.738713Z app/alb-XXXXX/a7c2180283d10881 203.xx.xx.xx:53464 - -1 -1 -1 503 - 144 
162 "GET http://my-alb-XXXXX.ap-northeast-1.elb.amazonaws.com:80/?delay=1000 HTTP/1.1" "curl/8.11.1" - - 
arn:aws:elasticloadbalancing:ap-northeast-1:123456789012:targetgroup/optimized-tg/41e7338699cf44e9 "Root=1
-69208ed9-4a2f731a0e5fabfe6f9d184f" "-" "-" 0 2025-11-21T16:10:01.736000Z "forward" "-" "-" "-" "503" "-" 
"-" TID_3e941d6f5423694e9f3f8e512cc30b7c "-" "-" "-"