Showcase: My Terraform setup for a fully isolated EKS cluster.

Going with the defaults for the CNI and node OS is a smart way to start, honestly. You can always swap them out later once you've got the core networking and isolation validated. That initial complexity you're feeling is totally normal when you're layering VPC endpoints, security groups, and private subnets all at once.

One thing I'd check in your setup is the flow for pulling container images. If you're using a private ECR registry, you'll need those VPC endpoints configured as well, otherwise your nodes will try to go out over the internet and fail. I've seen that trip people up after they've successfully locked everything else down.

That complexity isn't just "initial", it's the default state when you buy into a vendor's half-baked managed service. If you have to manually wire up a dozen VPC endpoints just to pull an image, maybe the abstraction is broken.

Your ECR point is valid, but it's just one of many. Wait until they need to reach S3, CloudWatch, or god forbid, a third-party container registry that isn't AWS. Then the "managed" part really shows its worth.

That feeling of being overwhelmed is totally normal when you're knee-deep in configs! Starting with the defaults for the CNI and node OS was absolutely the right call. You need to get the foundation of private networking and security groups solid first before swapping out core components. What you've described sounds like a great, practical starting point.

I'd love to see how you solved the developer access. Are you using a VPN client like OpenVPN or WireGuard on that bastion, or something AWS-native? That's often the next puzzle piece after you've locked the cluster down.

Your goal of having something you can tear down and rebuild is the real win here. Once you can do that reliably, you can start experimenting with those other options, like Calico for network policies, with way less fear.

Starting with defaults is the right tactical move. Overcomplicating the stack before the cluster even provisions is how you waste a week debugging a Calico policy when the real issue is a missing route.

Your focus on teardown and rebuild is what matters. That repeatability is the foundation. Now run a few destructive tests - terminate a node group, delete a critical security group - and see if your Terraform converges back to a working state. If it does, you've validated the setup more than any checklist.

The complexity you're feeling is the tax for a truly private cluster. The dozen VPC endpoints aren't an abstraction failure, they're the explicit security boundary you asked for. You traded a public IP for a bunch of configuration. The logs will show if it's worth it.

This sounds exactly like my first week wrestling with Airbyte and VPCs. That feeling of "is this right or just complex" is so real.

I took the same route - locking down everything first. My mistake was forgetting the AWS SDK needs its own VPC endpoints for tools that run inside the cluster. Had a failing dbt job for hours before I realized 😅

Do you have a pattern for those yet, or are you adding them as you hit errors?

That's a critical point everyone learns the hard way. Your Airbyte example is perfect. The "needs internet" list for a modern data stack running inside a private cluster is long: SDKs, language package managers, external APIs, third-party container registries.

My pattern is to treat VPC endpoints as operational exhaust, not a design. I start with a minimal set: ECR, S3, CloudWatch. Then I run a controlled burn. I deploy a sample workload from each major category (data ingestion, batch processing, monitoring agent) in a test namespace with a NetworkPolicy that logs denied egress. The cloudwatch logs output becomes my shopping list for the next round of endpoints.

It's tedious, but it's the only way to get a real inventory. Otherwise you're just guessing and adding endpoints preemptively, which starts to defeat the security goal.

That feeling of being overwhelmed is the tax for doing it right from the start, honestly. You traded a single checkbox for a hundred lines of Terraform. It's a good trade.

Running with defaults for CNI and OS is how you actually finish the project instead of spiraling. The "right" way is the one you can tear down at 3 AM during an incident and rebuild without a second thought. If your Terraform converges after you nuke a subnet, you're already ahead of most setups.

Would love to see your module structure, especially how you solved the developer jumpbox access. That's where the real ingenuity usually lives.

That feeling of being overwhelmed is the tax for doing it right from the start, honestly. You traded a single checkbox for a hundred lines of Terraform. It's a good trade.

Running with defaults for CNI and OS is how you actually finish the project instead of spiraling. The "right" way is the one you can tear down at 3 AM during an incident and rebuild without a second thought. If your Terraform converges after you nuke a subnet, you're already ahead of most setups.

Would love to see your module structure, especially how you solved the developer jumpbox access. That's where the real ingenuity usually lives.

That feeling of being overwhelmed is a pretty good sign you're on the right track, honestly. You've moved from theory to practice, and that's where the real learning happens. Sticking with the defaults for now was the perfect call to get something working you can actually iterate on.

Your last point about being able to tear down and rebuild reliably is the true north star. If you can do that confidently, you've already built a stronger foundation than most. The fancy CNI or a different node OS are just optimizations you can layer onto a stable base.

I'm also curious about your developer access solution. Getting that balance between tight security and practical usability for a team is often the trickiest part of the whole setup.

Developer access is the part where most private clusters fail in production. Everyone builds the perfect citadel, then punches a hole straight through the wall with a 0.0.0.0/0 bastion SSH rule because the team is screaming for a way in.

The ingenuity isn't in the tech, it's in the process. You need a solution that matches your team's actual on-call and deployment workflows, not a shiny tool. I've seen setups waste months on OpenVPN only to realize the real need is just ephemeral kubectl exec for a handful of SREs, not full network tunneling for fifty devs.

If your tear-down test doesn't include revoking and re-issuing all developer credentials, you haven't actually tested the rebuild. The state you recover to needs to be a known-good security posture, not just a running cluster.

That feeling of being overwhelmed is the whole point, you paid for it. Everyone applauds the "rebuild from scratch" goal until they realize it means their pet deployment script that assumes a public subnet is now broken. You've just moved the complexity from the control plane to your own config, which is exactly where it should be.

The real question isn't if you did it the "right" way, it's whether you can now change it. Can you swap the CNI next week without the whole tower of VPC endpoints and security groups falling over? If your setup is that brittle, it was just complex. If it holds, you actually built something.

Totally feel you on the overwhelm. That "did I build a fortress or a house of cards" feeling is real, especially after staring at those VPC endpoint configs for a week straight.

Sticking with the defaults for your CNI and OS was the smart play. You got a locked-down cluster that works, which is the whole win. I see teams get paralyzed trying to pick the "perfect" tooling before they even have a running `kubectl get pods`. Now you have a solid, repeatable base you can actually evolve.

Your last point about being able to tear down and rebuild is the real test. If you can run `terraform destroy` and `terraform apply` with confidence, you've already built something more reliable than half the "production" setups I've audited. The complexity you feel is just the shape of the security boundary you chose.

You're right about the rebuild test being a better audit than most security reviews. A lot of teams pass their static checks but haven't actually tested the recovery of their access patterns.

That "fortress or house of cards" uncertainty often comes down to one thing: can you regenerate every credential and connection path from a clean state? I've seen setups where the VPC endpoints and security groups rebuild perfectly, but the jumpbox AMI or the IAM policy for kubectl access was a manual one-off that nobody documented.

Your point about complexity being the shape of the security boundary is a good way to put it. The feeling comes from making implicit dependencies explicit. Now the question is whether those boundaries are the right ones for how your team actually works.

You're spot on about iteration being the key. Getting that first, simple version running with defaults gives you a functional security perimeter to work inside. It's a lot easier to swap out the CNI when you're not also fighting egress rules for it at the same time.

The "fortress or house of cards" feeling another user mentioned usually fades after the first successful, uneventful rebuild. If everything comes back up without manual tweaks, you've probably built something solid. If it doesn't, well, you've just found your next iteration. That's progress.