VPC Flow Log Overview
A VPC flow log records information about the traffic going to and from a VPC. VPC flow logs help you monitor network traffic, analyze network attacks, and determine whether security group and network ACL rules require modification.
VPC flow logs must be used together with the Log Tank Service (LTS). You need to create a log group and a log topic in LTS, and then create a VPC flow log. Figure 1 shows the procedure for configuring the VPC flow log function.
The VPC flow log function itself is free of charge, but you may be charged for other resources used. For example, VPC flow log records are stored in LTS, and you will be charged for using the LTS service. For details, see Log Tank Service User Guide.
VPC flow logs are currently available for open beta test in regions AP-Singapore, CN South-Guangzhou, and AP-Bangkok. You can try this function only after you obtain the OBT permissions.
Notes and Constraints
- Currently, only P1, G3, PI1, C3, M3, H3, D3, I3, SN3, S6, and T6 ECSs support VPC flow logs. For details about ECS types, see ECS Types.
- By default, a user can create a maximum of 10 VPC flow logs.
- By default, a maximum of 400,000 flow logs are supported.
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