About CatherineCatharine brings more than fifteen years of experience building global networks and large scale data center infrastructure to the challenge of scaling quickly and safely.  She loves building engaged and curious teams, providing insightful forecasting tools, and thinking about how to build to scale in a sustainable way to preserve a humane quality of life on this swiftly tilting planet. When not trying to predict the future as a capacity planner, she’s often knitting extremely complicated sweaters and coming up with ridiculous puns.TranscriptAnnouncer: Hello, and welcome to Screaming in the Cloud with your host, Chief Cloud Economist at The Duckbill Group, Corey Quinn. This weekly show features conversations with people doing interesting work in the world of cloud, thoughtful commentary on the state of the technical world, and ridiculous titles for which Corey refuses to apologize. This is Screaming in the Cloud.Corey: Tailscale SSH is a new, and arguably better way to SSH. Once you’ve enabled Tailscale SSH on your server and user devices, Tailscale takes care of the rest. So you don’t need to manage, rotate, or distribute new SSH keys every time someone on your team leaves. Pretty cool, right? Tailscale gives each device in your network a node key to connect to your VPN, and uses that same key for SSH authorization and encryption. So basically you’re SSHing the same way that you’re already managing your network.So what’s the benefit? Well, built-in key rotation, the ability to manage permissions as code, connectivity between any two devices, and reduced latency. You can even ask users to re-authenticate SSH connections for that extra bit of security to keep the compliance folks happy. Try Tailscale now - it's free forever for personal use.Corey: Kentik provides Cloud and NetOps teams with complete visibility into hybrid and multi-cloud networks. Ensure an amazing customer experience, reduce cloud and network costs, and optimize performance at scale — from internet to data center to container to cloud. Learn how you can get control of complex cloud networks at www.kentik.com, and see why companies like Zoom, Twitch, New Relic, Box, Ebay, Viasat, GoDaddy, booking.com, and many, many more choose Kentik as their network observability platform. Corey: Welcome to Screaming in the Cloud. I’m Corey Quinn. As a cloud economist, I wind up talking to an awful lot of folks about optimizing their AWS bills. That is what it says on the tent. It’s what I do. Increasingly, I’m having discussions around the idea of sustainability because the number-one rule of cloud economics is also the number-one rule for sustainability. Step one, turn that shit off. If you’re not using it, turn that shit off. If it doesn’t add value commensurate to what it costs, turn that shit off. Because the best way to optimize something is to get rid of it. Today, to go into bit more depth on that, my guest is Catharine Strauss. Catharine, thank you for joining me.Catharine: Thank you. I’m excited.Corey: So, you have a long and storied career of effectively running global-scale network operations in terms of capacity planning, in terms of building out world-spanning networks, and logistics of doing that. You know, the stuff that’s completely invisible to most people, except when it breaks. So, it’s more or less a digital plumbing-type of role. How did you go from there to thinking about sustainability in a networking context?Catharine: Yeah. Thank you. I got dropped into networking as a career option, completely from the physical side, building out global networks. And all of the constraints that we were dealing with, were largely physical, logistical, or legal. So, we would do things like ship things through customs and have items stopped because they were miscategorized as munitions because they were lasers, “Pew, pew.” We had things like contract negotiations for data centers to do trenching into them that needed easements with the railroad. Like, jus