"Configuration" is a double-edged sword, it will take you to understand various configuration methods

What is configuration

Many people can't tell the difference between configuration and configuration management, but they are completely different concepts.

Configuration management: It is a series of measures to control and standardize software products and their development process and life cycle through technical or administrative means.Its goal is to record the evolution process of software products and ensure that software developers can obtain accurate product configuration information at all stages of the software life cycle.

Configuration: Refers to configurable variables that are independent of the program, but have an effect on the program.That is to say, the same code will produce different results under different configurations.

From the above definition, you can see that configuration and configuration management are fundamentally different: configuration management serves the software development process, while configuration serves the program itself.

As a programmer, you often have to face different operating environments during development: development environment, test environment, production environment, intranet environment, extranet environment, etc.Different environments generally have different related configurations, such as data source configuration, log file configuration, and some basic configurations during software running.

In addition, you will also encounter some business and logical configurations.For example, different billing logic is adopted for different regions, and the billing logic needs to be adjusted at any time according to the needs of these regions.

If we hard-code all this information in the code, the result is that the code needs to be modified every time the environment is different or the business logic is adjusted.If the code is modified one day, it needs a complete test, so the cost of the change will be huge.

As a result, we tend to address these issues through "configurations".

However, the "configuration" itself is very particular.At what stage to configure and what means to use for configuration will directly affect the effect of continuous delivery.

Then, I will talk to you about the various configuration methods in detail.

build-time configuration

Taking Maven as an example, profiles are required to achieve build portability across multiple environments.A profile is an optional set of configurations that can be used to set or override configuration defaults.Build portability can be achieved by activating different profiles in different environments.We can look at a simple