Error 502 accessing nextcloud via docker with nginx - docker

Question

Heyo!
Update: I figured it out and added my answer.
I'm currently in the process of learning docker and I've written a docker-compose file that should launch nginx, gitea, nextcloud and route them all via domain name as a reverse proxy.
All is going well except for with nextcloud. I can access it via localhost:3001 but not via the nginx reverse proxy. All is well with gitea, it works both ways.
The error I'm getting is:
nginx_proxy | 2018/08/10 00:17:34 [error] 8#8: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.19.0.1, server: cloud.example.ca, request: "GET / HTTP/1.1", upstream: "http://172.19.0.4:3001/", host: "cloud.example.ca"
docker-compose.yml:
version: '3.1'
services:
nginx:
container_name: nginx_proxy
image: nginx:latest
restart: always
volumes:
// Here I'm swapping out my default.conf for the container's by mounting my
directory over theirs.
- ./nginx-conf:/etc/nginx/conf.d
ports:
- 80:80
- 443:443
networks:
- proxy
nextcloud_db:
container_name: nextcloud_db
image: mariadb:latest
restart: always
volumes:
- nextcloud_db:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD_FILE: /run/secrets/cloud_db_root
MYSQL_PASSWORD_FILE: /run/secrets/cloud_db_pass
MYSQL_DATABASE: devcloud
MYSQL_USER: devcloud
secrets:
- cloud_db_root
- cloud_db_pass
networks:
- database
gitea_db:
container_name: gitea_db
image: mariadb:latest
restart: always
volumes:
- gitea_db:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD_FILE: /run/secrets/cloud_db_root
MYSQL_PASSWORD_FILE: /run/secrets/cloud_db_pass
MYSQL_DATABASE: gitea
MYSQL_USER: gitea
secrets:
- cloud_db_root
- cloud_db_pass
networks:
- database
nextcloud:
image: nextcloud
container_name: nextcloud
ports:
- 3001:80
volumes:
- nextcloud:/var/www/html
restart: always
networks:
- proxy
- database
gitea:
container_name: gitea
image: gitea/gitea:latest
environment:
- USER_UID=1000
- USER_GID=1000
restart: always
volumes:
- gitea:/data
ports:
- 3000:3000
- 22:22
networks:
- proxy
- database
volumes:
nextcloud:
nextcloud_db:
gitea:
gitea_db:
networks:
proxy:
database:
secrets:
cloud_db_pass:
file: cloud_db_pass.txt
cloud_db_root:
file: cloud_db_root.txt
My default.conf that gets mounted into /etc/nginx/conf.d/default.conf
upstream nextcloud {
server nextcloud:3001;
}
upstream gitea {
server gitea:3000;
}
server {
listen 80;
listen [::]:80;
server_name cloud.example.ca;
location / {
proxy_pass http://nextcloud;
}
}
server {
listen 80;
listen [::]:80;
server_name git.example.ca;
location / {
proxy_pass http://gitea;
}
}
I of course have my hosts file setup to route the domains to localhost. I've done a bit of googling but nothing I've found so far seems to align with what I'm running into. Thanks in advance!

Answer 1

Long story short, one does not simply reverse proxy to port 80 with nextcloud. It's just not allowed. I have it deployed and working great with a certificate over 443! :)