Docker Expose Port 548

Expose Port 548 in Docker

docker run -p 548:548 your-image-name
		

This command maps container port 548 to the same port on the host machine.

Dockerfile Example

FROM node:18-alpine
WORKDIR /app
COPY . .
EXPOSE 548
CMD ["npm", "start"]
		

The EXPOSE instruction documents that the container listens on port 548.

EXPOSE vs Publish (-p)

• EXPOSE 548 documents the port inside the container.
• -p 548:548 makes the port accessible from the host.
• Exposed ports are not reachable unless published.

Docker Expose Port 548 Not Working

If Docker expose port 548 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 548 Already in Use

The error “port 548 already in use” means another process is already bound to that port on your host system.

# Find process using port 548
lsof -i :548

# OR use a different host port
docker run -p 8080:548 your-image-name
		

• Ensure your app is listening on port 548 inside the container
• Verify the port is published using -p
• Check firewall or network rules
• Avoid conflicts with existing services

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