Docker Expose Port 298

Expose Port 298 in Docker

docker run -p 298:298 your-image-name
		

This command maps container port 298 to the same port on the host machine.

Dockerfile Example

FROM node:18-alpine
WORKDIR /app
COPY . .
EXPOSE 298
CMD ["npm", "start"]
		

The EXPOSE instruction documents that the container listens on port 298.

EXPOSE vs Publish (-p)

• EXPOSE 298 documents the port inside the container.
• -p 298:298 makes the port accessible from the host.
• Exposed ports are not reachable unless published.

Docker Expose Port 298 Not Working

If Docker expose port 298 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 298 Already in Use

The error “port 298 already in use” means another process is already bound to that port on your host system.

# Find process using port 298
lsof -i :298

# OR use a different host port
docker run -p 8080:298 your-image-name
		

• Ensure your app is listening on port 298 inside the container
• Verify the port is published using -p
• Check firewall or network rules
• Avoid conflicts with existing services

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