带有 Spring Boot 应用程序的 docker secret 在 docker swarm 模式下不起作用/run/secrets

Question

我正在尝试为 MySQL 容器和 Spring Boot 应用程序设置数据库密码的环境变量，这通常在 docker secrets 中声明。

echo "db_secured_password" | docker secret create secret -

这是配置文件:

spring boot application's -> application.yml

db:
  name: my-db
  host: localhost
  port: 3306
  username: root
  password: /run/secrets/db-root-password
spring:
  application:
    name: core-backend
  datasource:
    url: jdbc:mysql://${db.host}:${db.port}/${db.name}
    username: ${db.username}
    password: ${db.password}

used for docker stack in docker swarm mode -> docker-compose.yml

version: '3.1'

services: 

  mysql-db:
    container_name: mysql-db
    image: mysql:8.0.12
    deploy:
      restart_policy:
        condition: on-failure
    volumes:
      - ./data/mysql:/var/lib/mysql
      - ./conf/mysql/my.cnf:/etc/mysql/conf.d/my.cnf
    environment:
      - MYSQL_ROOT_PASSWORD=/run/secrets/db-root-password
      - MYSQL_DATABASE=my_db
    ports: 
      - "3306:3306"
    secrets: 
      - db-root-password

  spring-boot-app:
    container_name: spring-boot-app
    image: spring-boot-app:local
    environment:
      - DB_PASSWORD=/run/secrets/db-root-password
# Also tried adding with the file as property name
#     - DB_PASSWORD_FILE=/run/secrets/db-root-password
    ports:
      - "8080:8080"
    environment:
      HOST_NAME: localhost
    secrets: 
      - db-root-password
    depends_on:
      - mysql-db

secrets:
  db-root-password:
    external: true

我使用以下命令运行 docker 堆栈:

docker stack deploy --with-auth-registry -c docker-compose.yml test-stack 

I'm unable to get the value of the db-root-password property exactly in spring boot app. When I inspect the value of db-root-password I get the value as /run/secrets/db-root-password.

有什么遗漏吗？
如果我想以不同的方式覆盖环境变量的值？

Answer 1

我们通过使用“printf”而不是“echo”解决了同样的问题，echo 的问题是它会在 docker secret 中留下一个换行符。您可以引用 docker secret create => https://docs.docker.com/engine/reference/commandline/secret_create/ 中的示例

另外，我有一个示例将 docker secret 直接加载到 spring 属性中，例如“spring.datasource.password”=> https://github.com/kwonghung-YIP/spring-boot-docker-secret