Technical Challenge: Implementing SSH Access for Multiple VMs on Shared IP Infrastructure
By
apitman
Toasted just enough. A reliable bake, gently seasoned.
Summary
The article discusses the technical challenge of implementing SSH access for multiple VMs on a shared IP address infrastructure at exe.dev. Since providing each VM with its own IPv4 address would be cost-prohibitive, and IPv6-only solutions would exclude some users, the company needed to find a way to route SSH connections to the correct VM without using the Host header (which SSH doesn't support). The article explores the technical approach to sharing IPs between VMs while maintaining SSH functionality.
Key quotes
· 3 pulledWe have a challenge with ssh. Every VM has a standard URL that we use for both HTTPS and SSH, e.g. undefined-behavior.exe.xyz.
We cannot issue an IPv4 address to each machine without blowing out the cost of the subscription. We cannot use IPv6-only as that means some of
This is very straightforward to implement if you give each machine its own IP address, but exe.dev gives you many VMs on a flat rate subscription.
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