Merge pull request #50 from alfg/feature/envsubst

Add support for envsubst.

Author: alfg

Dockerfile

@@ -82,7 +82,7 @@ RUN apk add --update \
   x265-dev \
   yasm
 
-RUN echo http://dl-cdn.alpinelinux.org/alpine/edge/testing >> /etc/apk/repositories
+RUN echo http://dl-cdn.alpinelinux.org/alpine/edge/community >> /etc/apk/repositories
 RUN apk add --update fdk-aac-dev
 
 # Get FFmpeg source.
@@ -126,8 +126,14 @@ RUN rm -rf /var/cache/* /tmp/*
 FROM alpine:3.11
 LABEL MAINTAINER Alfred Gutierrez <alf.g.jr@gmail.com>
 
+# Set default ports.
+ENV HTTP_PORT 80
+ENV HTTPS_PORT 443
+ENV RTMP_PORT 1935
+
 RUN apk add --update \
   ca-certificates \
+  gettext \
   openssl \
   pcre \
   lame \
@@ -148,11 +154,13 @@ COPY --from=build-ffmpeg /usr/lib/libfdk-aac.so.2 /usr/lib/libfdk-aac.so.2
 
 # Add NGINX path, config and static files.
 ENV PATH "${PATH}:/usr/local/nginx/sbin"
-ADD nginx.conf /etc/nginx/nginx.conf
+ADD nginx.conf /etc/nginx/nginx.conf.template
 RUN mkdir -p /opt/data && mkdir /www
 ADD static /www/static
 
 EXPOSE 1935
 EXPOSE 80
 
-CMD ["nginx"]
+CMD /bin/sh -c "envsubst" < /etc/nginx/nginx.conf.template > \
+  /etc/nginx/nginx.conf && \
+  nginx

README.md

@@ -45,6 +45,9 @@ This will enable HTTPS using a self-signed certificate supplied in [/certs](/cer
 
 I recommend using [Certbot](https://certbot.eff.org/docs/install.html) from [Let's Encrypt](https://letsencrypt.org).
 
+### Environment Variables
+This Docker image uses `envsubst` for environment variable substitution. You can define additional environment variables in `nginx.conf` as `${var}` and pass them in your `docker-compose` file or `docker` command.
+
 ### OBS Configuration
 * Stream Type: `Custom Streaming Server`
 * URL: `rtmp://localhost:1935/stream`

docker-compose.yml

@@ -7,5 +7,8 @@ services:
       - 1935:1935
       - 8080:80
       - 8443:443
+    environment:
+      - HTTP_PORT=80
+      - RTMP_PORT=1935
     volumes:
       - ./certs:/opt/certs

nginx.conf

@@ -8,7 +8,7 @@ events {
 
 rtmp {
     server {
-        listen 1935;
+        listen ${RTMP_PORT};
         chunk_size 4000;
 
         application stream {
@@ -49,7 +49,7 @@ http {
     ssl_session_timeout 10m;
 
     server {
-        listen 80;
+        listen ${HTTP_PORT};
 
         # Uncomment these lines to enable SSL.
         # Update the ssl paths with your own certificate and private key.