Running Astro in SSR mode in containerized environments

Astro has a SSR mode with some of the adapters, which makes Astro output not just a set of HTML pages, but Node.js server which generates HTML on every request.

There is one thing to consider if you deploy it to Fly.io or Azure Web Apps environments — don’t forget to add HOST=0.0.0.0 environment variable in run command.

In my case, it was start script in package.json file:

{
  "start": "HOST=0.0.0.0 node ./dist/server/entry.mjs"
}