Reverse proxy localhost from docker

[francislavoie]

When in docker, localhost means “this same container”, i.e. Caddy’s own container.

If you want to proxy to another container, you need to use that container’s IP address, or service name. So you probably want reverse_proxy netdata:19999

Also, please upgrade to Caddy v2.3.0!

Since I see you’re proxying on a subpath, here’s some additional reading materials about that:

The "subfolder problem", OR, "why can't I reverse proxy my app into a subfolder?"

Have you ever tried to reverse proxy an app into its own little subfolder of your domain name? Makes things neat, doesn’t it? Using example.com/foo/ for one app, example.com/bar/ for another. If you’re coming here from one of the selfhosted communities, you might be thinking along the lines of example.com/sonarr/, example.com/radarr/ etc. Chances are, you’ve tried some configuration along these lines: example.com { redir /sonarr /sonarr/ handle_path /sonarr/* { reverse_proxy localhost…

I would recommend proxying with a subdomain like netdata.example.com instead of a subpath.