AWS Elastic Load Balancing, Amazon CloudWatch and Auto Scaling

AWS Elastic Load Balancing Application load balance, 面向应用，外部：internet，内部：internal internet-facing (http/https) internal Network load balance，面向网络，TCP，TLS 最好将Load Balance的DNS暴露给外部，而不是IP地址，因为AWS可能会自动切换I

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