Docker Expose Port 450

Expose Port 450 in Docker

docker run -p 450:450 your-image-name
		

This command maps container port 450 to the same port on the host machine.

Dockerfile Example

FROM node:18-alpine
WORKDIR /app
COPY . .
EXPOSE 450
CMD ["npm", "start"]
		

The EXPOSE instruction documents that the container listens on port 450.

EXPOSE vs Publish (-p)

• EXPOSE 450 documents the port inside the container.
• -p 450:450 makes the port accessible from the host.
• Exposed ports are not reachable unless published.

Docker Expose Port 450 Not Working

If Docker expose port 450 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 450 Already in Use

The error “port 450 already in use” means another process is already bound to that port on your host system.

# Find process using port 450
lsof -i :450

# OR use a different host port
docker run -p 8080:450 your-image-name
		

• Ensure your app is listening on port 450 inside the container
• Verify the port is published using -p
• Check firewall or network rules
• Avoid conflicts with existing services

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