1. Basic Concepts master master is where Jenkins is installed and runs; it is responsible for parsing job scripts, handling tasks, and scheduling compute resources. agent agent is responsible for handling tasks dispatched from master; the actual operations are executed through an executor. executor An executor is the compute resource

1. Introduction GitLab is an open-source application developed with Ruby on Rails. It implements self-hosted Git project repositories, and public or private projects can be accessed through a web interface. It has features similar to GitHub, and can browse source code, manage defects and comments. It can manage team access

1. What Docker Is Docker was born in early 2013 as a side project inside dotCloud (the former name of Docker Inc.). Its source code is hosted on GitHub, it is written in Go, and it follows the Apache 2.0 open-source license. The goal of the Docker project is to provide a lightweight operating system virtualization solution.

1. Basic Concepts Continuous Integration Continuous integration emphasizes that once developers commit new code, a build and (unit) test run immediately. From the test results we can determine whether the new code and the existing code integrate correctly. Continuous Delivery Building on continuous integration, continuous delivery deploys the integrated code