What is the method for dynamically injecting configuration in springboot and setting environment variables with docker?

1. Springboot dynamically injects configuration information.

This is a very simple question, but I am not good at remembering commands. I just know that the practical jar -jar is used to add a few parameters when starting the springboot project. I can't remember the specific parameters. I don’t know how these commands are configured, so I’ll briefly summarize them here.

Springboot configuration priority Default configuration

1. Set the database connection address url to empty packaging.

#这里是数据库配置 数据库的连接地址 现在我把url设置为空然后打包jar
spring:
  datasource:
    #数据源基本配置
    username: root
    password: jishuzhai
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: 
    type: com.alibaba.druid.pool.DruidDataSource

2. Test startup.

java -jar brief-plus_oa.jar #Trying to start the application will report the following error
#Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

3. Inject parameters to start.

This -D increases my understanding of java execution commands

java -jar -Dspring.datasource.url="jdbc:mysql://127.0.0.1:3306 /brief_min?zeroDateTimeBehavior=convertToNull&serverTimezone=Asia/Shanghai&allowMultiQueries=true&useUnicode=true&characterEncoding=utf-8" brief-plus_oa.jar #Start the project successfully. Note that the spring.datasource.url here must be consistent with the fields in the configuration file

4. Customize the injection parameter field.

整个url字段全部注入现在太难输入了，整个url只有ip地址是变化的这里可以简化一下看下面配置:
 
 brief:
  mysql:
    host: #自定义的参数
    
spring:
  datasource:
    #数据源基本配置
    username: root
    password: jishuzhai
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://${brief.mysql.host}:3306/brief_min?zeroDateTimeBehavior=convertToNull&serverTimezone=Asia/Shanghai&allowMultiQueries=true&useUnicode=true&characterEncoding=utf-8
    type: com.alibaba.druid.pool.DruidDataSource
重新打包然后运行：
 
java -jar -Dbrief.mysql.host=127.0.0.1 brief-plus_oa.jar #启动成功

5. Inject multiple parameters.

java -jar -Dspring.profiles.active=dev -DBRIEF.MYSQL.HOST=192.168.2.5 -DSPRING.REDIS.HOST=192.168.2.5 brief-plus_oa.jar

6. Common startup parameters.

Set configuration file: port, parameters, etc.

Set log output

Set virtual machine settings

Set encoding

java -jar -Dserver.port=10000 brief-plus_oa.jar #Set the port
java -jar -DSPRING_PROFILES_ACTIVE=dev brief-plus_oa.jar #Set the effective configuration file to dev
java -jar -Dlogging.path =/Users/fuping/Desktop/log brief-plus_oa.jar #Set the log file storage directory
java -jar -Dbrief.mysql.host=127.0.0.1 brief-plus_oa.jar & #Start the printing process id
java -jar -Dfile.encoding=utf-8 brief-plus_oa.jar #Set the file encoding to use when the windows server starts with garbled characters
nohup java -jar brief-plus_oa.jar > log.txt 2>&1 & #Background startup And enter the startup log into the log.txt file and print the process id
java -Xms256m -Xmx512m brief-plus_oa.jar #Set the virtual machine memory address

Note that the parameter name after -D is not Case sensitive

2. Docker dynamically injects env environment variables

1. Dockerfile configuration.

FROM openjdk:17
# 镜像是从 openjdk:11-jdk-alpin 继承而来的
VOLUME /root/tmp
# 表示挂载了 /root/tmp 目录到容器中
ADD build/libs/brief-plus_oa-0.0.1-SNAPSHOT.jar apprun.jar
# 将bootJar 添加到镜像中根目录下 命令为 apprun.jar
ENTRYPOINT ["java","-jar","/apprun.jar"]
# ENTRYPOINT 在容器启动后执行 java 命令来运行程序
# 设置容器时间
ENV TZ=Asia/Shanghai
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
EXPOSE 8099

2. Build docker image.

sudo docker build -t brief_plus_ao:v1.0.0.1 -f ./Dockerfile .

3. Run the image and inject the env environment variable. -e

sudo docker run  -p 8090:8090 -e BRIEF.MYSQL.HOST=192.168.31.113  -e SPRING.REDIS.HOST=192.168.31.113 brief_plus_ao:v1.0.0.1

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