# Nginx reverse proxy example with defined location directive In this example, the reverse proxy is defined only under the `/plantuml` context path. All other context paths (locations) are not affected and are freely available. This allows the server to be used for more than "just" PlantUML. References: - [Nginx documentation](https://nginx.org/en/docs/) - [Nginx beginner's guide](https://nginx.org/en/docs/beginners_guide.html) ## Quick start Be sure to have [`docker-compose.yml`](./docker-compose.yml) and [`nginx.conf`](./nginx.conf) inside your current working directory. ```bash # start nginx and plantuml server docker-compose up -d # stop nginx and plantuml server docker-compose down ``` Check with `docker ps` if both container are up and running: ``` $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 217e753a0dcf plantuml/plantuml-server:jetty "/entrypoint.sh" 4 seconds ago Up 3 seconds 8080/tcp plantuml-server 9b1290c100f5 nginx:alpine "/docker-entrypoint.…" 4 seconds ago Up 3 seconds 0.0.0.0:80->80/tcp, :::80->80/tcp nginx ``` Open [http://localhost/plantuml](http://localhost/plantuml) inside your browser. YEAH! You are now using PlantUML behind a simple Nginx reverse proxy. ## Nginx configuration ```nginx ... # PlantUML location /plantuml/ { proxy_set_header HOST $host; proxy_set_header X-Forwarded-Host $host; proxy_set_header X-Forwarded-Proto $scheme; proxy_pass http://plantuml-server:8080/plantuml/; } ... ``` - `location /plantuml/` to reverse only the context path `/plantuml` - `proxy_set_header HOST $host` and `proxy_set_header X-Forwarded-Host $host` to replaces local plantuml server ip with FQDN - `proxy_set_header X-Forwarded-Proto $scheme` to use reverse proxy protocol schema instead of communication schema between reverse proxy and plantuml server - `proxy_pass http://plantuml-server:8080/plantuml/` to set reverse proxy path to plantuml server. Use the docker container name `plantuml-server` instead of ip addresses. Also, use the same context path (`BASE_URL`) as PlantUML, which is configurable as an environment variable in the docker-compose file. ## Nginx and PlantUML server ```yaml version: "3" services: plantuml-server: image: plantuml/plantuml-server:jetty container_name: plantuml-server environment: - TZ="Europe/Berlin" - BASE_URL="plantuml" nginx: image: nginx:alpine container_name: nginx ports: - "80:80" environment: - TZ="Europe/Berlin" volumes: - ./nginx.conf:/etc/nginx/nginx.conf:ro ``` - Set `container_name` to use them instead of e.g. ip addresses - Set the environment `TZ` the ensure the same timezone. For example to server timezone (`cat /etc/timezone`)? - plantuml-server * plantuml-server already exposes port `8080` to it's own local network (but not outside). Since plantuml-server and nginx are sharing a network, nginx can reach plantuml-server without further settings. * Set the environment `BASE_URL` to the preferred context path - nginx * open/link port `80` to the outside * `./nginx.conf:/etc/nginx/nginx.conf:ro` to use your own Nginx configuration (readonly) ## Useful commands ```bash # see whats going on inside your docker containers docker logs --tail 50 --follow --timestamps nginx docker logs --tail 50 --follow --timestamps plantuml-server ```