If you don’t have any private subnets, you can skip this step.Ĭonfigure routing. Adding a NAT Gateway to the public subnet of your transit hub VPC is a critical step to allowing private instances access to the internet. If your existing VPCs already have internet gateways, don’t delete them! Keep them around until you’re sure that you’ve got everything routing properly.Ĭonfigure a NAT gateway (optional). It takes just a few seconds, and the AWS docs to set this up are easy to follow. VPC peering allows you to establish private connections between one or more VPCs. Ensure that the subnets you configure here don’t overlap with any of the subnets already configured in your existing VPCs.Įstablish VPC peering from your new VPC to your existing VPC(s). Private subnets are useful in transit hub architectures as these are great places for cloud and network operations teams to place bastion hosts and other shared services that need to be in the center of the action. Add public and private subnets to the new transit VPC. Lastly, attach an internet gateway to the VPC.Īdd subnets. Don’t use the Launch VPC Wizard from the VPC Dashboard - instead, head over to “Your VPCs” and click on “Create VPC” to ensure that AWS doesn’t try to preconfigure needless cruft that you’ll have to delete later. If you choose to build this in a different account, then you’ll have to also address cross-account IAM policies (which are beyond the scope of this post). Build your new transit VPC in the same account or a different account from your original VPC(s). Setting Up a "transit VPC" or "transit hub" is one way to insert a flow log source into the data path between your VPCs in AWS.īuild a new VPC. Flow logs are generated only from VPCs, subnets, and network interfaces. Internet gateways aren’t manageable or monitorable constructs in your VPC they just exist as route targets in your VPC’s route table. You simply can’t configure flow logging on internet gateways, which would seem like an obvious place to do so. AWS doesn’t easily allow you to configure flow logs for this use case. Gaining visibility here is one of the most powerful steps you can take to optimize and secure your cloud - helping you defend against cyber attacks, improve your customers’ digital experience, and save money on your data transfer bill.īut we have a small problem. While setting up global VPC Flow Logs takes just a few minutes, building logs that only capture inter-VPC flow and internet flows can take a bit more time and thought. Monitoring Your Cloud Edge: Easier Said Than Done ![]() Follow the instructions to set up flow logs to publish to an S3 bucket, and away you go. Simply navigate to Your VPCs, select a VPC and then hit the “Enable Flow Log” button from the “Flow Logs” tab in the detail pane. You can begin producing logs within a few minutes, just by flipping a switch on each of your VPCs. It also happens to be the easiest way to get started. So, if you’re not running mega-behemoth VPC infrastructure, then it’s totally possible to turn on logging everywhere without causing your CFO to barf. But turning on VPC Flow Logs everywhere might not fly in larger environments - because these logs cost real money - and no one wants to pay for something unless they understand the value for doing so. Think about what information you’ll need to find out which EC2 instance hogged a VPN connection or what service drove up costs on your NAT gateways, and so on. If you have flow logs turned on everywhere, you’ll never feel the burning regret of not having traffic logs when you really need them. The “Gimme Everything” Approach to VPC Flow Logsīefore I get too deep into the technology, I should mention that there’s totally a benefit to setting up logs carte-blanche across your VPCs. In this blog, I’ll walk you through how you can configure your AWS environment to target precisely what you want to monitor - nothing more, nothing less. ![]() The truth is that while flow logs do cost money, AWS has provided knobs that you can turn to keep your costs reasonable while still getting the visibility you need. ![]() Through the hundreds of customer conversations we’ve had, we’ve heard a widespread (and totally false) belief that AWS VPC Flow Logs must be configured to monitor every single part of your VPC environment - and thus are too expensive to set up as part of a comprehensive monitoring strategy. ![]() At Kentik, we’ve been ingesting and analyzing AWS VPC Flow Logs since 2018.
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