Docker Compose and Standard HTTP port

To get Apache Answer running on the standard HTTP port (port 80), you need to adjust your Docker Compose configuration and ensure no other services are conflicting on port 80. Here’s how you can do it:

Steps to Run Apache Answer on Port 80

1. Update Docker Compose Configuration

   Modify your docker-compose.yaml file to map port 80 on the host to port 80 on the container. Update the ports section like this:

   version: "3"
   services:
     answer:
       image: apache/answer
       ports:
         - '80:80'
       restart: on-failure
       volumes:
         - answer-data:/data
   
   volumes:
     answer-data:
   

2. Restart Docker Compose Services

   Bring down the current services and start them again with the updated configuration:

   docker-compose -p answer down
   docker-compose -p answer up -d
   

3. Check for Port Conflicts

   Ensure no other services are using port 80. You can check this with the following command:

   sudo lsof -i -P -n | grep LISTEN
   

   If another service is using port 80 (e.g., Nginx, Apache), you need to stop it or reconfigure it to use a different port.

4. Configure Firewall

   Ensure your firewall allows traffic on port 80. For UFW (Uncomplicated Firewall):

   sudo ufw allow 80/tcp
   

   If you are using DigitalOcean's cloud firewall, make sure it has rules allowing traffic on port 80.

Optional: Use a Reverse Proxy (e.g., Nginx)

If you prefer to keep Docker Compose running on port 9080 internally but want to access it on port 80 externally, you can set up Nginx as a reverse proxy.

1. Install Nginx

   sudo apt update
   sudo apt install -y nginx
   

2. Configure Nginx

   Create a new configuration file for your site:

   sudo nano /etc/nginx/sites-available/answer
   

   Add the following configuration:

   server {
       listen 80;
       server_name your_domain_or_ip;
   
       location / {
           proxy_pass http://127.0.0.1:9080;
           proxy_set_header Host $host;
           proxy_set_header X-Real-IP $remote_addr;
           proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
           proxy_set_header X-Forwarded-Proto $scheme;
       }
   }
   

3. Enable Nginx Configuration

   Enable the new configuration and restart Nginx:

   sudo ln -s /etc/nginx/sites-available/answer /etc/nginx/sites-enabled/
   sudo systemctl restart nginx
   

By following these steps, you can access Apache Answer on the standard HTTP port (port 80) without having to specify port 9080 in the browser URL.