Serving multiple projects with Dockerized QGIS Server

Question

Context : I'm building a cartographic service that should frequently receive weather forecasts data, process them (extract datas, create layers with associated symbology) then save them as independent projects. Then, each project can be broadcast through a WMS / WMTS, using a QGIS server.

With a contenerized approach, I have three docker containers :

• A reverse proxy (Nginx)
• A standalone app using qgis to process the data and creating projects
• A qgis-server serving these projects, using a volume configuration

As I wanted to stick as much as possible to the official documentation, most of my qgis-server and nginx configuration is taken from this page : Containerized deployment

Following these steps and deploying everything with docker-compose works like a charm.

However, trying to deviate from it in order to serve multiple projects with a single qgis-server instance is harder than I expected.

I saw a few existing subjects such as QGIS Server - Docker - Multiple Projects and explored some github repos to get inspiration :

• oq-qgis-server
• docker-qgis-server

But so far I couldn't find any successful workaround.

├── nginx
│ ├── nginx.conf
│
├── qgis-projects
│ ├── osm
│ | ├── osm.qgs
│ | |
│ ├── osm_bis
│ ├── osm_bis.qgs
│
├── qgis-server
│ ├── cmd.sh
│ ├── Dockerfile
│
├── .env
├── docker-compose.yml
 

Dockerfile (identic to the doc version)

# Configuration taken from https://docs.qgis.org/3.28/en/docs/server_manual/containerized_deployment.html
FROM debian:bullseye-slim
ENV LANG=en_EN.UTF-8
RUN apt-get update \
 && apt-get install --no-install-recommends --no-install-suggests --allow-unauthenticated -y \
 gnupg \
 ca-certificates \
 wget \
 locales \
 && localedef -i en_US -f UTF-8 en_US.UTF-8 \
 # Add the current key for package downloading
 # Please refer to QGIS install documentation (https://www.qgis.org/fr/site/forusers/alldownloads.html#debian-ubuntu)
 && mkdir -m755 -p /etc/apt/keyrings \
 && wget -O /etc/apt/keyrings/qgis-archive-keyring.gpg https://download.qgis.org/downloads/qgis-archive-keyring.gpg \
 # Add repository for latest version of qgis-server
 # Please refer to QGIS repositories documentation if you want other version (https://qgis.org/en/site/forusers/alldownloads.html#repositories)
 && echo "deb [signed-by=/etc/apt/keyrings/qgis-archive-keyring.gpg] https://qgis.org/debian bullseye main" | tee /etc/apt/sources.list.d/qgis.list \
 && apt-get update \
 && apt-get install --no-install-recommends --no-install-suggests --allow-unauthenticated -y \
 qgis-server \
 spawn-fcgi \
 xauth \
 xvfb \
 && apt-get remove --purge -y \
 gnupg \
 wget \
 && rm -rf /var/lib/apt/lists/*
RUN useradd -m qgis
ENV TINI_VERSION v0.19.0
ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
RUN chmod +x /tini
ENV QGIS_PREFIX_PATH /usr
ENV QGIS_SERVER_LOG_STDERR 1
ENV QGIS_SERVER_LOG_LEVEL 2
COPY cmd.sh /home/qgis/cmd.sh
RUN chmod -R 777 /home/qgis/cmd.sh
RUN chown qgis:qgis /home/qgis/cmd.sh
USER qgis
WORKDIR /home/qgis
ENTRYPOINT ["/tini", "--"]
CMD ["/home/qgis/cmd.sh"]

cmd.sh (identic to the doc)

[[ $DEBUG == "1" ]] && env
exec /usr/bin/xvfb-run --auto-servernum --server-num=1 /usr/bin/spawn-fcgi -p 5555 -n -d /home/qgis -- /usr/lib/cgi-bin/qgis_mapserv.fcgi

docker-compose.yml, working for a single project, without tries I made to include multiple projects.

version: '3.7'
services:
 qgis-server:
 # Should use version with utf-8 locale support:
 image: qgis-server:latest
 env_file:
 - .env
 environment:
 - LANG=en_EN.UTF-8
 - QGIS_PROJECT_FILE=/data/${PROJECT_NAME}
 - QGIS_SERVER_LOG_LEVEL=0 # INFO (log all requests)
 - DEBUG=1 # display env before spawning QGIS Server
 volumes:
 - ${PREFIX_PATH}/qgis-projects:/data:ro
 nginx:
 image: nginx:1.13
 ports:
 - 8080:80
 depends_on:
 - qgis-server
 volumes:
 - ${PREFIX_PATH}/nginx/nginx.conf:/etc/nginx/conf.d/default.conf:ro

Environnent : Ubuntu throught WSL2

Answer 1

I found a workaround that seems to do the trick.

I only deleted one line inside docker-compose.yml :

version: '3.7'
services:
 qgis-server:
 # Should use version with utf-8 locale support:
 image: qgis-server:latest
 env_file:
 - .env
 environment:
 - LANG=en_EN.UTF-8
 #- QGIS_PROJECT_FILE=/data/${PROJECT_NAME} <- Delete this line 
 - QGIS_SERVER_LOG_LEVEL=0 # INFO (log all requests)
 - DEBUG=1 # display env before spawning QGIS Server
 volumes:
 - ${PREFIX_PATH}/qgis-projects:/data:ro
 nginx:
 image: nginx:1.13
 ports:
 - 8080:80
 depends_on:
 - qgis-server
 volumes:
 - ${PREFIX_PATH}/nginx/nginx.conf:/etc/nginx/conf.d/default.conf:ro

I can now reach localy these two projects : http://localhost:8080/qgis-server/?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetCapabilities&MAP=/data/osm_bis/osm_bis.qgs
http://localhost:8080/qgis-server/?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetCapabilities&MAP=/data/weather/my_project.qgs