Operation and Maintenance
Docker
How do you map ports between the host machine and a Docker container?
How do you map ports between the host machine and a Docker container?
Jul 10, 2025 am 11:53 AM
To access services in Docker containers from the host, you need to use port mapping. The specific steps are: 1. Use -p to specify host_port:container_port when starting the container, such as docker run -d -p 8080:80 nginx; 2. Multiple ports can be configured through multiple -p parameters or Docker Compose files; 3. You can limit IP address binding, such as -p 192.168.1.100:8080:80; 4. Use docker ps or docker inspect to view port mapping details.
When you want to access a service running inside a Docker container from your host machine (like a web server on port 80), you need to map ports between the host and the container. This is done when you start the container using the -p flag.
Basic Port Mapping
To map a single port, use the -p option followed by the host port and container port in the format host_port:container_port .
For example:
docker run -d -p 8080:80 nginx
This command maps port 8080 on your host to port 80 in the container where NGINX is listening.
- The
-druns the container in detached mode. - You can now access the NGINX server via
http://localhost:8080.
This is the most common way and works for most basic services like HTTP servers, databases, etc.
Mapping Multiple Ports
Sometimes your app needs more than one port exposed — for instance, a web app that uses both HTTP (port 80) and HTTPS (port 443).
You can map multiple ports by adding more -p flags:
docker run -d -p 8080:80 -p 8443:443 nginx
Alternatively, you can do the same using a YAML-based Docker Compose file:
services:
web:
image: nginx
Ports:
- "8080:80"
- "8443:443"This method is helpful if you're managing several containers or services together.
Specifying IP Addresses
If your host has multiple network interfaces or you want to restrict access to a specific IP, you can include it in the port mapping:
docker run -d -p 192.168.1.100:8080:80 nginx
Now, the container's port 80 is only accessible via http://192.168.1.100:8080 .
This is useful in production-like settings or when you want to bind to a specific interface instead of all ( 0.0.0.0 by default).
Checking Mapped Ports
After starting a container, you might want to verify which ports are mapped. Use this command:
docker ps
It shows the container ID, image, port mappings, and status.
If you want more details:
docker inspect <container_id>
Look for the "Ports" section to see exactly how ports are bound.
That's how you handle port mapping in Docker — not too complicated once you get used to the syntax and options.
The above is the detailed content of How do you map ports between the host machine and a Docker container?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
.NET Core Quick Start Tutorial 1. The beginning: Talking about .NET Core
May 07, 2025 pm 04:54 PM
1. The Origin of .NETCore When talking about .NETCore, we must not mention its predecessor .NET. Java was in the limelight at that time, and Microsoft also favored Java. The Java virtual machine on the Windows platform was developed by Microsoft based on JVM standards. It is said to be the best performance Java virtual machine at that time. However, Microsoft has its own little abacus, trying to bundle Java with the Windows platform and add some Windows-specific features. Sun's dissatisfaction with this led to a breakdown of the relationship between the two parties, and Microsoft then launched .NET. .NET has borrowed many features of Java since its inception and gradually surpassed Java in language features and form development. Java in version 1.6
How to develop a complete Python Web application?
May 23, 2025 pm 10:39 PM
To develop a complete Python Web application, follow these steps: 1. Choose the appropriate framework, such as Django or Flask. 2. Integrate databases and use ORMs such as SQLAlchemy. 3. Design the front-end and use Vue or React. 4. Perform the test, use pytest or unittest. 5. Deploy applications, use Docker and platforms such as Heroku or AWS. Through these steps, powerful and efficient web applications can be built.
Docker vs. Kubernetes: Key Differences and Synergies
May 01, 2025 am 12:09 AM
Docker and Kubernetes are leaders in containerization and orchestration. Docker focuses on container lifecycle management and is suitable for small projects; Kubernetes is good at container orchestration and is suitable for large-scale production environments. The combination of the two can improve development and deployment efficiency.
What is cross-compilation in C?
Apr 28, 2025 pm 08:21 PM
Cross-compilation in C refers to compiling an executable file or library that can run on another platform on one platform. 1) Cross-compilation requires the use of a special cross-compiler, such as GCC or Clang variants. 2) Setting up a cross-compilation environment can use Docker to manage toolchains to improve repeatability and portability. 3) When cross-compiling, pay attention to code optimization options, such as -O2, -O3 or -Os, to balance performance and file size.
How to view process information inside Docker container
May 19, 2025 pm 09:06 PM
There are three ways to view the process information inside the Docker container: 1. Use the dockertop command to list all processes in the container and display PID, user, command and other information; 2. Use dockerexec to enter the container, and then use the ps or top command to view detailed process information; 3. Use the dockerstats command to display the usage of container resources in real time, and combine dockertop to fully understand the performance of the container.
How to deploy a PyTorch app on Ubuntu
May 29, 2025 pm 11:18 PM
Deploying a PyTorch application on Ubuntu can be done by following the steps: 1. Install Python and pip First, make sure that Python and pip are already installed on your system. You can install them using the following command: sudoaptupdatesudoaptinstallpython3python3-pip2. Create a virtual environment (optional) To isolate your project environment, it is recommended to create a virtual environment: python3-mvenvmyenvsourcemyenv/bin/activatet
Performance Tuning of Jenkins Deployment on Debian
May 28, 2025 pm 04:51 PM
Deploying and tuning Jenkins on Debian is a process involving multiple steps, including installation, configuration, plug-in management, and performance optimization. Here is a detailed guide to help you achieve efficient Jenkins deployment. Installing Jenkins First, make sure your system has a Java environment installed. Jenkins requires a Java runtime environment (JRE) to run properly. sudoaptupdatesudoaptininstallopenjdk-11-jdk Verify that Java installation is successful: java-version Next, add J
Efficient operation method for batch stopping Docker containers
May 19, 2025 pm 09:03 PM
An efficient way to batch stop a Docker container includes using basic commands and tools. 1. Use the dockerstop$(dockerps-q) command and adjust the timeout time, such as dockerstop-t30$(dockerps-q). 2. Use dockerps filtering options, such as dockerstop$(dockerps-q--filter"label=app=web"). 3. Use the DockerCompose command docker-composedown. 4. Write scripts to stop containers in order, such as stopping db, app and web containers.
