Docker Expose Port 797

Expose Port 797 in Docker

docker run -p 797:797 your-image-name
		

This command maps container port 797 to the same port on the host machine.

Dockerfile Example

FROM node:18-alpine
WORKDIR /app
COPY . .
EXPOSE 797
CMD ["npm", "start"]
		

The EXPOSE instruction documents that the container listens on port 797.

EXPOSE vs Publish (-p)

• EXPOSE 797 documents the port inside the container.
• -p 797:797 makes the port accessible from the host.
• Exposed ports are not reachable unless published.

Docker Expose Port 797 Not Working

If Docker expose port 797 is not working, it is usually due to incorrect port publishing, an application not listening on the expected port, or a port conflict on the host machine.

Port 797 Already in Use

The error “port 797 already in use” means another process is already bound to that port on your host system.

# Find process using port 797
lsof -i :797

# OR use a different host port
docker run -p 8080:797 your-image-name
		

• Ensure your app is listening on port 797 inside the container
• Verify the port is published using -p
• Check firewall or network rules
• Avoid conflicts with existing services

Related Docker Expose Port Guides