Docker-friendly environment variables substitution for Nginx configuration.
Implemented via https://nginx.org/en/docs/njs/, use Javascript template literals.
- Just write Javascript in
${ }block, it's template literals. - Use function:
Env(name:string, default?:string)
location ^~ /api {
proxy_set_header Host ${Env('NGINX_PROXY_HOST', '$http_host')};
proxy_pass http://${Env('NGINX_UPSTREAM')};
}
FROM nginx:stable-alpine
RUN curl -L https://raw.githubusercontent.com/guyskk/envsub-njs/main/envsub-njs.sh \
-o /usr/local/bin/envsub-njs && chmod +x /usr/local/bin/envsub-njs
RUN echo '/usr/local/bin/envsub-njs /etc/nginx/nginx.conf' \
> /docker-entrypoint.d/01-envsub-njs-nginx.sh && \
chmod +x /docker-entrypoint.d/01-envsub-njs-nginx.sh
# When container starts, it will auto execute scripts in /docker-entrypoint.dSource code is very short, take a look :)