Crash course in setting up Tailscale on your servers
Tailscale is an awesome service for people that run their own servers. I usually hate dealing with networking but using Tailscale makes it a lot easier. If you combine it with Kamal you can have nice DNS names to deploy to. (No one paid me to make this, I just like the service lol)
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Reference Links
Tailscale: https://tailscale.com/
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Check out https://devscoach.com to learn more about Rails and self-hosting.