Add Docker Healthcheck

[MarcelCoding]

Changes
Added Docker Healthcheck to ensure jellyfin is always available. (e.g. This enables reverse proxies (traefik) to remove jellyfin from the routes if it is overloaded.)

Issues
Fixed #5760

PS: squash the pr, if the signature should be correct :) I did it in a codespace.

[crobibero]

This also may not work if the server the server has RequireHttps enabled

[cvium]

This also may not work if the server the server has RequireHttps enabled

@crobibero Won't it also break if the server isn't listening on localhost?

[crobibero]

This also may not work if the server the server has RequireHttps enabled

@crobibero Won't it also break if the server isn't listening on localhost?

Yeah that would also not work… maybe we should just have the health check url default to local host:8096 but allow it to be completely overridden using an ENV variable

[MarcelCoding]

Should I create a new env var? If there is a reverse proxy it must be the address and port without the reverse proxy.

[crobibero]

Should I create a new env var? If there is a reverse proxy it must be the address and port without the reverse proxy.

I want to say yes, but it’ll have to be tested by someone who terminates ssl with Jellyfin and has RequireHttps enabled

[MarcelCoding]

I personally use a reverse proxy but without https between jellyfin and the proxy. But I could test it.

[crobibero]

I believe that’s how most people have Jellyfin set up. Additionally, with 10.8 (unstable) there is an automatic redirect to remove the baseUrl when getting health status

[MarcelCoding]

As long as a trusted certificate is used and require https is enabled it is working. If you have any other edge cases that I should test, let me know.

[MarcelCoding]

I believe that’s how most people have Jellyfin set up. Additionally, with 10.8 (unstable) there is an automatic redirect to remove the baseUrl when getting health status

Do you mean xxx/baseurl/health -> xxx/health or xxx/health -> xxx/baseurl/health?

[MarcelCoding]

I also would like to add the option -L to curl that it follows redirects, just in case someone misses something in the configuration.

[crobibero]

xxx/health -> xxx/baseurl/health
Implementation here: https://github.com/jellyfin/jellyfin/blob/master/Jellyfin.Server/Middleware/BaseUrlRedirectionMiddleware.cs

[joshuaboniface]

Looks good. @MarcelCoding can you add the same to the https://github.com/jellyfin/jellyfin-metapackages Dockerfiles?

[MarcelCoding]

@joshuaboniface
jellyfin-archive/jellyfin-metapackages#14