How do I use flow logs to monitor the traffic to and from network interfaces in my virtual private cloud (VPC)?

VPC flow logs can help you track and understand traffic to and from your VPC, a subnet, or a network interface. This data is then stored in CloudWatch for you to analyze later.

Read and understand the limitations of CloudWatch flow logs, and if they’ll work for your use case, create an IAM role for your flow log, and then create a flow log by following the instructions at Working with Flow Logs.

Note: Flow logs are not updated in real time, and so should be used for analysis and troubleshooting only.

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Published: 2016-08-25