Hello, everyone. Recently, the company's new project is developed with spincloud family bucket. Originally, spring cloud was only at the primary level of understanding. This time, with the opportunity of the new project, we can deeply practice spring cloud, even Happy. When I graduated from University, I had the idea of writing technical articles when I entered the job. I wasted so many years. All the problems I encountered during the period were easily saved in the narrow space of Youdao cloud notes. I have to see all the notes. Later, I have the opportunity to move out, learn from each other, improve my skills and cultivate my internal skills. Let's start the spring cloud journey now!

Project version

spring-boot-version: 2.2.5.RELEASE

spring-cloud.version: Hoxton.SR3

ConfigServer server

Build the spring cloud config server first
Open https://start.spring.io/
Check Config Server, download and import IDE

Some pom information

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-config-server</artifactId>
</dependency> 

application.properties

# Application service name
spring.application.name=config-server
# Application service port number
server.port=9001
# Git remote library retrieve relative address
spring.cloud.config.server.git.search-paths=/springCloudAProject/**
# Git remote library http access project address
spring.cloud.config.server.git.uri=https://github.com/niuniu9631/SpringCloudConfig
# Git remote library http access authentication user name
spring.cloud.config.server.git.username=Own Git Account number
# Git remote library http access authentication password
spring.cloud.config.server.git.password=Own Git Account password

ConfigServerApplication.java

@EnableConfigServer
@SpringBootApplication
public class ConfigServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(ConfigServerApplication.class, args);
    }
}

So far, the relevant code configuration of the server has been OK. Let's Run it together.
Access the service through the browser, http://localhost:9001/

Because no access interface is open to the public, 404 is right. As long as the project is not started incorrectly, it means that there is no problem in configuration. You can build a client to access and pull down data. Here I provide a tip I found here. After the startup is correct, you can go to the temporary file of the system to check whether there is a new directory starting with config repo XXXX. Some words indicate that there is no problem in Git configuration of the server.

Windows default temporary directory: C:\Users\wyb\AppData\Local\Temp

Linux default temporary directory: / tmp
The configuration item can be adjusted according to the configuration item

spring.cloud.config.server.git.basedir = specify directory

I have not configured the specified directory. The temporary directory file is as follows

ConfigClient client

As usual, open https://start.spring.io/,
Check Config Client, Spring Web, download and import IDE.

Some pom information

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

application.properties

# Client service application name
spring.application.name=config-client
# Client port number
server.port=9002

bootstrap.properties

# Application service name
spring.cloud.config.name=config-client
# Corresponding branch name on git
spring.cloud.config.label=master
# Corresponding to the profiles parameter on the configuration file
spring.cloud.config.profile=dev
# Configure server request address
spring.cloud.config.uri=http://localhost:9001/

ConfigClientApplication.java

@SpringBootApplication
public class ConfigClientApplication {
    public static void main(String[] args) {
        SpringApplication.run(ConfigClientApplication.class, args);
    }
}

ConfigClientWebController.java
Used to access configuration items for authentication

@RestController
public class ConfigClientWebController {
    @Value("${app.env.name}")
    private String appEnvName;
    @RequestMapping("/getEnv")
    public String getEnv() {
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())+",envName:"+appEnvName;
    }
}

So far, the configuration of the client code is OK. Let's Run it together.
Access the service through the browser, http://localhost:9002/getEnv

Successfully obtained configuration item information in Git remote warehouse. The remote warehouse directory is as follows

Matters needing attention

So far, I have basically completed the construction and configuration of the server and client of the configuration center. Next, I have encountered problems in the construction process.

Question 1: configuration of spring.cloud.config.server.git.search-paths
At the beginning, the configuration parameters are as follows

spring.cloud.config.server.git.search-paths=/springCloudAProject/**

The Config Server starts normally, and the Config Client starts with the following error

java.lang.IllegalArgumentException: Could not resolve placeholder

Later, I found out the problem by myself/**
There is a certain correspondence, which can't be misused. After adjusting the directory structure, you can access it normally

Question 2
The Git of the company's project is managed by Alibaba cloud Code. After the server is configured, it always prompts that there is no permission to access it
After checking the permissions of the following items, they are also the master. The account and password are all right. How can they not have permission to access them. After struggling for a long time, I didn't make progress. Later, I checked the Spring Cloud Config configuration item and found that SSH access can be configured. Let's try. Adjust the server configuration as follows

spring.cloud.config.server.git.uri = git@code.aliyun.com:XXX/XProjectConfig.git
spring.cloud.config.server.git.ignore-local-ssh-settings=true
spring.cloud.config.server.git.private-key=XXX

There is another problem here. The configuration on the Internet is based on the yml configuration. I think it should be compatible. Copy the private key, and it seems that the configuration can't be recognized normally if it's not correct. Then I learned from Baidu that
The line before the beginning and end of the private key needs to be \ n, and the middle line needs to be \ connected; to ensure that the content of the private key is the green valid value text
As follows

spring.cloud.config.server.git.private-key=-----BEGIN RSA PRIVATE KEY-----\n\
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\
XXXXXXXXXXXXXXXXXXXXXXXXX\
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\
XXXXXXXXXXXXXXXXXXXXXXX\n\
-----END RSA PRIVATE KEY-----