Docker Expose Port 546

Expose Port 546 in Docker

docker run -p 546:546 your-image-name
		

This command maps container port 546 to the same port on the host machine.

Dockerfile Example

FROM node:18-alpine
WORKDIR /app
COPY . .
EXPOSE 546
CMD ["npm", "start"]
		

The EXPOSE instruction documents that the container listens on port 546.

EXPOSE vs Publish (-p)

• EXPOSE 546 documents the port inside the container.
• -p 546:546 makes the port accessible from the host.
• Exposed ports are not reachable unless published.

Docker Expose Port 546 Not Working

If Docker expose port 546 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 546 Already in Use

The error “port 546 already in use” means another process is already bound to that port on your host system.

# Find process using port 546
lsof -i :546

# OR use a different host port
docker run -p 8080:546 your-image-name
		

• Ensure your app is listening on port 546 inside the container
• Verify the port is published using -p
• Check firewall or network rules
• Avoid conflicts with existing services

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