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