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AWS VPC Flow Logs

AWS VPC Flow Logs

What it gives you — the network_drops tool on any AWS VPC, including EKS clusters running the AWS VPC CNI where Cilium/Hubble is absent. Reads REJECT records from the CloudWatch Logs group your VPC Flow Logs deliver to. Read-only; auth is in-cluster identity (EKS Pod Identity / IRSA) — no static keys.

Minimal config 

network:
  provider: aws-vpc-flow-logs
  aws: { region: eu-west-3, log_group: /aws/vpc/flowlogs }

A custom flow-log field layout (a log group created with a non-default field list):

network:
  provider: aws-vpc-flow-logs
  aws:
    region: eu-west-3
    log_group: /aws/vpc/flowlogs
    flow_format: custom
    flow_fields: { srcaddr: 1, dstaddr: 2, srcport: 3, dstport: 4, protocol: 5 }

Verify it locally 

kubectl -n runlore logs deploy/runlore | grep -E 'network provider enabled.*aws-vpc-flow-logs'

Fire a test incident that touches a rejected flow and confirm network_drops was called:

kubectl -n runlore logs deploy/runlore | grep 'tool=network_drops'

Notes

  • Requires logs:FilterLogEvents on the target CloudWatch Logs group (Pod Identity / IRSA role policy).
  • flow_format defaults to the standard v2 layout (14 fields). Set it to custom and provide flow_fields (a field-name → 0-based column index map; srcaddr, dstaddr, srcport, dstport, protocol are required) when your log group was created with a non-default field list — a custom-format group silently returns no results under the v2 assumption otherwise, because the positional field parsing no longer holds.
  • VPC Flow Logs are IP-based. v1 returns recent VPC-wide REJECT records rather than pod-scoped flows — the namespace/pod selector on the network_drops call is not mapped to IPs. Treat the result as “what’s being rejected in this VPC lately”, not “what’s being rejected for this specific pod”.
  • Any AWS VPC works, Cilium or not — this is the CNI-agnostic path for clusters on the AWS VPC CNI. For a Cilium cluster, Hubble gives pod-scoped flows instead.

Reference

OpenSearchGCP Firewall Logs