CloudFormation takes 8 hours to complete


I used CloudFormation to restore a RDS snapshot to a new instance, and it took 8 hours to complete!! The original instance (where the snapshot was taken) disk size is 45G, and the new instance is 50G which I specified in the CloudFormation template. According to AWS, that is the reason why it took so … Continue reading CloudFormation takes 8 hours to complete

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Check DNS Cache when deploy Multi-AZ RDS


It is a common practice to enable mutli-AZ when deploy RDS in AWS to provide high availability. That's not all. There is one more thing you need to check - DNS cache setting of your applications/codes. If you overlook it, the hight availability design may not work as you expect. Imagine that when RDS detects the failure … Continue reading Check DNS Cache when deploy Multi-AZ RDS