Hi,
I am bumping into issues with baseURL and absURL parsing when running hugo from within a docker container.
config.toml
baseURL = “http://[hostname]:[port]/”
sudo docker run -d --rm -v /tmp/[path]:/src -p [port]:1313 -u hugo jguyomard/hugo-builder hugo server -w --bind=0.0.0.0
[hostname] => some hostname
[port] => some port
[path] => path to local hugo source directory
Will HUGO_BASEURL override this behavior?
The solution to my many problems seems to have a workaround in this trippy thread: [SOLVED] What should be used for the value of .Site.BaseURL?
Lol @ “trippy thread”. 
How does one suggest a documentation request around here?
There may be a feature gap here. Or, I am still confused. Not placing odds.
To render baseURL correctly in templates, I would need to do something like the following:
sudo docker run \
-d --rm -v ${srcdir}:/src \
-p ${vmport}:${hugoport} -u hugo \
jguyomard/hugo-builder \
hugo server -w --bind=${bindiface} --baseURL ${baseurl} --port ${hugoport}
${vmport} is the port used outside of the container, on which all resources are published (from the point of view of hugo service users.
${hugoport} is the port used by the hugo server, inside of the container. It gets baked into absURL (and maybe baseURL, not sure from the previous post).
${publishport} is the port used by the proxy server, exposed to the world at ${vmhostname}
Scenario:
bindport=1234
hugoport=2345
publishport=3456
vmhostname=somehost
Result:
absUrl = localhost:1234 # inside container
absUrl = localhost:2345 # outside container (as served by hugo)
upstream URL = somehost:3456 # outside of VM (served by a reverse proxy, translated to localhost:2345 by the proxy server)
But if hugo is serving localhost:2345 in hrefs and src attributes, then requests will come back to the proxy on the wrong port.
Is there another way to make it work that I am unaware of?
Have the proxy server do the re-write on the way back… Obviously…