#How does docker implement packaging?
Docker related terms:
(1). Mirror, container, warehouse
Docker’s characteristics:
(1) .Keywords: container, standard, isolation.
Docker deployment practice:
1. Create dockerfile
Pay attention to the assumptions I mentioned: your jar package or war package All have been packaged successfully and docker has been installed successfully.
The content of dockerfile is as follows:
FROM azul/zulu-openjdk:8 VOLUME /home/work/springDemo ADD springDemo-0.0.1-SNAPSHOT.jar app.jar RUN bash -c 'touch /app.jar' ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
FROM: Which image it is based on
VOLUME: You can mount local folders or folders of other containers into the container
ADD: Copy the file
RUN: The RUN command will execute any legal command in the current image and submit the execution results. After the command execution is submitted, the next instruction in the Dockerfile will be automatically executed
ENTRYPOINT: The command executed when the container starts, but there can only be one ENTRYPOINT command in a Dockerfile. If there are multiple ones, only the last one will be executed.
Key points: The location of dockerfile and jar package or war package
Note: The newly created Dockerfile file needs to be in the same folder as the jar.
2. Generation of Jar package
You may be confused when you see the .jar package in the picture above. How is this package generated? Let's take a look at how this package is generated.
Since I built the project through maven, I also built it through maven. Of course, the premise is still that maven is installed in your environment. Let’s take a look at the screenshots for the specific operation.
After the above operations, the jar package is built.
3. Generate image
Shell command description: The key point is that you need to cd to the folder where the Dockerfile and jar package or war package are stored.
Command: sudo docker build -t springbootdemo .
Note: The . after the command must be brought.
I can’t remember the meaning of the -t parameter. You can view the explanation of related functions through sudo docker build --help. springbootdemo is the image name of the build.
The above operations complete the creation of the Docker image. Check whether the image is created successfully, command: sudo docker images , you can see that springbootdemo is the image just created.
4. Start the container
Containers are actually equivalent to mirror carriers.
Screenshot of container startup command:
Startup command: sudo docker run -d -p 8080:8080 springbootdemo
Parameters of -d -p I have also forgotten the meaning, you can check it out. 8080: 8080 is a port mapping. Its specific logic and principles. I suggest you learn Docker and take a closer look. springbootdemo is the image file I mentioned above.
View the currently running containers: sudo docker ps
5. Verification
For verification, please check us Whether the Demo is deployed successfully, if your jar package or war package is the same as mine and is a web program, you can test it through the browser.
Related recommendations: docker tutorial
The above is the detailed content of How docker implements packaging. For more information, please follow other related articles on the PHP Chinese website!

Installing and configuring Docker on Linux requires ensuring that the system is 64-bit and kernel version 3.10 and above, use the command "sudoapt-getupdate" and install it with the command "sudoapt-getupdate" and verify it with "sudoapt-getupdate" and. Docker uses the namespace and control groups of the Linux kernel to achieve container isolation and resource limitation. The image is a read-only template, and the container can be modified. Examples of usage include running an Nginx server and creating images with custom Dockerfiles. common

The reason for using Docker is that it provides an efficient, portable and consistent environment to package, distribute, and run applications. 1) Docker is a containerized platform that allows developers to package applications and their dependencies into lightweight, portable containers. 2) It is based on Linux container technology and joint file system to ensure fast startup and efficient operation. 3) Docker supports multi-stage construction, optimizes image size and deployment speed. 4) Using Docker can simplify development and deployment processes, improve efficiency and ensure consistency across environments.

Docker's application scenarios in actual projects include simplifying deployment, managing multi-container applications and performance optimization. 1.Docker simplifies application deployment, such as using Dockerfile to deploy Node.js applications. 2. DockerCompose manages multi-container applications, such as web and database services in microservice architecture. 3. Performance optimization uses multi-stage construction to reduce the image size and monitor the container status through health checks.

Select Docker in a small project or development environment, and Kubernetes in a large project or production environment. 1.Docker is suitable for rapid iteration and testing, 2. Kubernetes provides powerful container orchestration capabilities, suitable for managing and expanding large applications.

Docker is important on Linux because Linux is its native platform that provides rich tools and community support. 1. Install Docker: Use sudoapt-getupdate and sudoapt-getinstalldocker-cedocker-ce-clicotainerd.io. 2. Create and manage containers: Use dockerrun commands, such as dockerrun-d--namemynginx-p80:80nginx. 3. Write Dockerfile: Optimize the image size and use multi-stage construction. 4. Optimization and debugging: Use dockerlogs and dockerex

Docker is a containerization tool, and Kubernetes is a container orchestration tool. 1. Docker packages applications and their dependencies into containers that can run in any Docker-enabled environment. 2. Kubernetes manages these containers, implementing automated deployment, scaling and management, and making applications run efficiently.

The purpose of Docker is to simplify application deployment and ensure that applications run consistently in different environments through containerization technology. 1) Docker solves the environmental differences problem by packaging applications and dependencies into containers. 2) Create images using Dockerfile to ensure that the application runs consistently anywhere. 3) Docker's working principle is based on images and containers, and uses the namespace and control groups of the Linux kernel to achieve isolation and resource management. 4) The basic usage includes pulling and running images from DockerHub, and the advanced usage involves managing multi-container applications using DockerCompose. 5) Common errors such as image building failure and container failure to start, you can debug through logs and network configuration. 6) Performance optimization construction

The methods of installing and using Docker on Ubuntu, CentOS, and Debian are different. 1) Ubuntu: Use the apt package manager, the command is sudoapt-getupdate&&sudoapt-getinstalldocker.io. 2) CentOS: Use the yum package manager and you need to add the Docker repository. The command is sudoyumininstall-yyum-utils&&sudoyum-config-manager--add-repohttps://download.docker.com/lin


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

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

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

Dreamweaver Mac version
Visual web development tools
