Introduction to Jenkins and how to deploy Jenkins with Docker

1. Related concepts

1.1 Jenkins Concepts:

Jenkins is a powerful application that allows for continuous integration and continuous delivery of projects, regardless of the platform used. It's a free source code that can handle any kind of build or continuous integration. Integration with Jenkins can be used for several testing and deployment techniques. Jenkins is a software that allows continuous integration.

1.2 Jenkins Purpose:

1. Continuously and automatically build/test software projects.
2. Monitor the software opening process, quickly locate and handle problems, and improve opening efficiency.

1.3 Features:

An open source Java language development continuous integration tool that supports CI and CD.

Easy to install, deploy and configure: It can be installed through yum, or by downloading war packages and quickly installed and deployed through docker containers, which facilitates web interface configuration management.

Message notification and test report: Integrated RSS/E-mail to publish build results via RSS or notify via e-mail when the build is completed, and generate JUnit/TestNG test reports.

Distributed build: Support Jenkins to enable multiple computers to build/test together.

File identification: Jenkins can track which build generates which jars, which build uses which version of jars, etc.

Rich plug-in support: Supports extended plug-ins, you can develop tools suitable for your team, such as git, svn, maven, docker, etc.

1.4 Product Release Process:

• Product design is completed -> Developers develop code -> Testers test functions -> Operations and maintenance personnel release and launch
• Continuous integration (CI)
• Continuous delivery
• Continuous deployment

Docker deployment

docker run -it --name jenkins --restart always --user root -p 10002:8080 -p 50000:50000 -v /var/run/docker.sock:/var/run/docker.sock -v $(which docker):/usr/bin/docker jenkins

The external docker is mapped to the internal docker, so that the docker command can also be used inside the jenkins container

Note that there will be a random password after startup:
example:
1e3180604feb492b9ed9af4e418715d7

If you start it with -it, you can see it in the command window.

Of course you can also enter the container and find it in /var/jenkins_home/secrets/initialAdminPassword.

You need to fill in this password when you open the web page for the first time.

After entering, you will be asked to install plug-ins. I have chosen to install all of them. Of course, you can also only install the recommended ones, or manually choose which plug-ins to install.

Reference: https://hub.docker.com/_/jenkins/

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