Hands-on tutorials on networking, cloud, and AWS
PacketSensei publishes practical, code-first tutorials on networking, cloud infrastructure, and AWS — from Lambda workflows to routing internals.
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CloudWatch log groups that never expire: How to Find Them and What They Cost
Log groups default to Never Expire, so ingestion and storage charges accumulate indefinitely. What that costs, how to list them, and the retention fix.
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Cross-AZ data transfer: How to Find Them and What They Cost
Cross-AZ traffic is charged per gigabyte in both directions, invisible on the bill until you know where to look. What it costs, and how to cut it.
gp2 volumes not migrated to gp3: How to Find Them and What They Cost
gp2 volumes cost about 20% more than gp3 for the same or worse performance. What the difference is worth, how to list yours, and how to migrate safely.
Idle load balancers: How to Find Them and What They Cost
Idle ALBs and NLBs bill hourly with no healthy targets and no requests. What they cost, the command that lists yours, and what to check before deleting.
Idle NAT gateways: How to Find Them and What They Cost
Idle NAT gateways bill by the hour for a path nothing uses. What they cost, the command that lists yours, and what to check before deleting one.
Idle RDS instances: How to Find Them and What They Cost
Idle RDS instances bill compute and storage around the clock with no connections. What they cost, how to list them, and what to check before stopping one.
Old EBS snapshots: How to Find Them and What They Cost
Old EBS snapshots accumulate forever, including ones behind deregistered AMIs. What they cost, the command that lists yours, and what to check first.