Update Dockerfile

Author: sarpedondev

Dockerfile

@@ -1,9 +1,10 @@
-# Use an older, compatible Node.js image
-FROM node:12-alpine
+# Use an older, compatible Node.js image (v10)
+FROM node:10-alpine
 
 # Set working directory
 WORKDIR /app
 
+# Alpine Linux is used, so we use 'apk' to install git
 RUN apk add --no-cache git
 
 # Install GitBook CLI globally
@@ -13,9 +14,9 @@ RUN npm install -g gitbook-cli
 RUN gitbook fetch latest
 
 # Copy your documentation files to the container
-# Add your book.json, SUMMARY.md, README.md and other content files here
 COPY . .
 
+# Create a default book.json if one doesn't exist
 RUN if [ ! -f "book.json" ]; then \
         echo '{"title": "My Documentation", "description": "Documentation served with GitBook"}' > book.json; \
     fi
@@ -26,8 +27,8 @@ RUN gitbook install
 # Build the static site
 RUN gitbook build
 
-# Expose port 3587
-EXPOSE 3587
+# Expose the default GitBook serve port
+EXPOSE 4000
 
-# Serve the built documentation
-CMD ["gitbook", "serve", "--port", "3587", "--host", "0.0.0.0"]
+# Serve the built documentation on all network interfaces
+CMD ["gitbook", "serve", "--port", "4000", "--host", "0.0.0.0"]