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# Nginx simple reverse proxy example
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](http://localhost) inside your browser.
YEAH! You are now using PlantUML behind a simple Nginx reverse proxy.
## Nginx configuration
```nginx
...
# PlantUML
location / {
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/;
}
...
```
- `location /` to reverse complete server
- `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/` to set reverse proxy path to plantuml server.
Use the docker container name `plantuml-server` instead of ip addresses.
## Nginx and PlantUML server
```yaml
version: "3"
services:
plantuml-server:
image: plantuml/plantuml-server:jetty
container_name: plantuml-server
environment:
- TZ="Europe/Berlin"
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.
- 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
```