After a network change, application servers cannot connect to the corresponding Amazon RDS MySQL database. What should the SysOps Administrator analyze?
Analyzing VPC Flow Logs can help identify network-level issues that may be affecting the connectivity between the application servers and the Amazon RDS MySQL database. It can reveal if there are any connectivity failures, network ACL rules blocking traffic, or routing issues within the VPC.
A。。。
In Mid 2015, Amazon released VPC Flow Logs, which are a way for you to monitor network traffic, even between instances such as load balancers and RDS managed databases that you can’t log into directly. In this post, we’ll use a Flow Log to determine what’s connecting to a database.
Seems logical to me that the right answer is A too - VPC flow logs
Using AWS VPC Flow Logs to Diagnose Intermittent RDS Connections
https://medium.com/@don/using-aws-vpc-flow-logs-to-diagnose-intermittent-rds-connections-fec5ee571538
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