[aidos]

I want to double check we’re talking about the same thing here. I’m referring to running everything inside a single VM that you would have total access to. It could have telemetry, you’d know versions etc. I wonder if there’s some confusion around what I’m suggesting given your points above.

I’m sure there are a bunch of things that make it the right choice for Stripe. Obviously if you just have too many things to run at a time and a dev laptop can’t handle it then it’s a dealbreaker. What’s the size of the cloud instances you have to run on?

[bhuga]

> I’m referring to running everything inside a single VM that you would have total access to. It could have telemetry, you’d know versions etc. I wonder if there’s some confusion around what I’m suggesting given your points above.

I don't think there's confusion. I only have total access when the VM is provisioned, but I need to update the dev machine constantly.

Part of what makes a VM work well is that you can make changes and they're sticky. Folks will edit stuff in /etc, add dotfiles, add little cron jobs, build weird little SSH tunnels, whatever. You say "I can know versions", but with a VM, I can't! Devs will run update stuff locally.

As the person who "deploys" the VM, I'm left in a weird spot after you've made those changes. If I want to update everyone's VM, I blow away your changes (and potentially even the branches you're working on!). I can't update anything on it without destroying it.

In constrast, the dev servers update constantly. There's a dozen moving parts on them and most of them deploy several times a day without downtime. There's a maximum host lifetime and well-documented hooks for how to customize a server when it's created, so it's clear how devs need to work with them for their customizations and what the expectations are.

I guess its possible you could have a policy about when the dev VM is reset and get developers used to it? But I think that would be taking away a lot of the good parts of a VM when looking at the tradeoffs.

> What’s the size of the cloud instances you have to run on?

We have a range of options devs can choose, but I don't think any of them are smaller than a high-end laptop.

[aidos]

So the devs don’t have the ability to ssh to your cloud instances and change config? Other than the size issue, I’m still not seeing the difference. Take your point on it needing to start before you have control, but other than that a VM on a dev machine is functionally the same as one in a cloud environment.

In terms of needing to reset, it’s just a matter of git branch, push, reset, merge. In your world that sync complexity happens all the time, in mine just on reset.

Just to be clear, I think it’s interesting to have a healthy discussion about this to see where the tradeoffs are. Feels like the sort of thing where people try to emulate you and buy themselves a bunch of complexity where other options are reasonable.

I have no doubt Stripe does what makes sense for Stripe. I’d also wager than on balance it’s not the best option for most other teams.

PS thanks for chiming in. I appreciate the extra insights and context.

[bhuga]

> So the devs don’t have the ability to ssh to your cloud instances and change config?

They do, but I can see those changes if I'm helping debug, and more importantly, we can set up the most important parts of the dev processes as services that we can update. We can't ssh into a VM on your laptop to do that.

For example, if you start a service on a stripe machine, you're sending an RPC to a dev-runner program that allocates as many ports as are necessary, updates a local envoy to make it routable, sets up a systemd unit to keep it running, and so forth. If I need to update that component, I just deploy it like anything else. If someone configures their host until that dev runner breaks, it fails a healthcheck and that's obvious to me in a support role.

> Just to be clear, I think it’s interesting to have a healthy discussion about this to see where the tradeoffs are. Feels like the sort of thing where people try to emulate you and buy themselves a bunch of complexity where other options are reasonable.

100% Agree! I think we've got something pretty cool, but this stuff is coming from a well-resourced team; keeping the infra for it all running is larger than many startups. There's tradeoffs involved: cost, user support, flexibility on the dev side (i.e. it's harder to add something to our servers than to test out a new kind of database on your local VM) come immediately to mind, but there are others.

There are startups doing lighter-weight, legacy-free versions of what we're doing that are worth exploring for organizations of any size. But remote dev isn't the right call for every company!

[aidos]

Ah! So that’s a spot where we’re talking past each other.

I’d anticipate you would be equally as able to ssh to VMs on dev laptops. That’s definitely a prerequisite for making this work in the same way as you’re currently doing.

The only difference between what you do and what I’m suggesting is the location of the VM. That itself creates some tradeoffs but I would expect absolutely everything inside the machine to be the same.

[bhuga]

> I’d anticipate you would be equally as able to ssh to VMs on dev laptops. That’s definitely a prerequisite for making this work in the same way as you’re currently doing.

Our laptops don't receive connections, but even if they could, folks go on leave and turn them off for 9 months at a time, or they don't get updated for whatever reason, or other nutty stuff.

It's surprisingly common with a few thousand of them out there that laptop management code that removes old versions of a tool is itself removed after months, but laptops still pop up with the old version as folks turn them back on after a very long time, and the old tool lingers. The services the tools interact with have long since stopped working with the old version, and the laptop behaves in unpredictable ways.

This doesn't just apply to hypothetical VMs, but various CLI tools that we deploy to laptops, and we still have trouble there. The VMs are just one example, but a guiding principle for us been that the less that's on the laptop, the more control we have, and thus the better we can support users with issues.

[codethief]

Maybe I'm missing something here but couldn't you just track the whole VM setup (dependencies, dev tools, telemetry and everything) in your monorepo? That is, the VM config would get pulled from master just like everything else, and then the developer would use something like nixos-shell[0] to quickly fire up a VM based on that config that they pulled.

[0]: https://github.com/Mic92/nixos-shell (not to be confused with nix-shell)

[drited]

I see in another comment thread you mentioned downloading the VM iso, presumably from a central source. Your comment in this thread didn't mention that so perhaps this answer (incorrectly) assumes the VM you are talking about was locally maintained/created?