simple nginx reverse proxy not working in docker compose - docker

Question

fhsmgr proxy works at / but not any other location with 404
fhsdir proxy gives 404 at /dir, though when i browse directly to it on localhost:5000 i get the expected output, so the host is up and running. also, nginx does not complain about invalid host and exit like i've seen it do before.
i have tried trailing '/' so '/dir/' to no avail.
i have tried putting fhsmgr at '/mgr' and i get the expected 404 at index '/' but then 404 again at '/mgr'.
i have tried without proxy_redirect off; as well.
i have removed the upstream statements and just directly put in container names
seemingly the only thing it'll let me proxy is at '/', though i know i've proxied to other servers at different location paths in setups like this before.
-- docker compose
version: "3.7"
services:
fhsmgr:
build: fhsmgr
restart: always
fhsdir:
build: fhsdir
restart: always
ports:
- 5000:5000
nginx:
build: nginx
restart: always
ports:
- 80:80
environment:
- NGINX_ENVSUBST_OUTPUT_DIR=/etc/nginx
- FHSMGR_HOST=fhsmgr
- FHSMGR_PORT=5000
- FHSDIR_HOST=fhsdir
- FHSDIR_PORT=5000
-- nginx conf
events {}
http {
# upstream fhsmgr {
# server ${FHSMGR_HOST}:${FHSMGR_PORT};
# }
# upstream fhsdir {
# server ${FHSDIR_HOST}:${FHSDIR_PORT};
# }
# a simple reverse-proxy
server {
listen 80 default_server;
location / {
proxy_pass http://fhsmgr:5000;
proxy_redirect off;
}
location /dir {
proxy_pass http://fhsdir:5000;
proxy_redirect off;
}
}
}
i am modifying this project https://github.com/AwsGeek/lightsail-containers-nginx to get it to work for my use case. Haven't gotten to lightsail, just using docker compose locally

Answer 1

You miss the container_name in your docker-compose,try this
version: "3.7"
services:
fhsmgr:
build: fhsmgr
restart: always
container_name: fhsmgr # allow other containers to access by container_name
fhsdir:
build: fhsdir
restart: always
container_name: fhsdir
ports:
- 5000:5000
nginx:
build: nginx
restart: always
ports:
- 80:80
environment:
- NGINX_ENVSUBST_OUTPUT_DIR=/etc/nginx
- FHSMGR_HOST=fhsmgr
- FHSMGR_PORT=5000
- FHSDIR_HOST=fhsdir
- FHSDIR_PORT=5000