Spring Boot Profile 作为 Docker ARGS 用于动态运行参数

Question

我有一个用于 Spring Boot 应用程序的 docker-compose.yml，其条目如下：

  paramer:
    image: miko/paramer:0.2.0
    build:
      context: ../paramer-docker/build
      args:
        profile:  docker
    container_name: miko-paramer
    ports:
      - "8050:8050"
    restart: unless-stopped

相关的Dockerfile如下：

ARG profile

COPY ./external/paramer-* app.jar

ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-Dspring.profiles.active=$profile","-jar","app.jar"]

但是，它会在 docker-compose up 处引发错误：

miko-paramer | 12:42:54.334 [main] ERROR org.springframework.boot.SpringApplication - Application startup failed
miko-paramer | java.lang.IllegalArgumentException: Could not resolve placeholder 'PROFILE' in value "${PROFILE}"
miko-paramer |  at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:174)
miko-paramer |  at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126)
miko-paramer |  at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:236)
miko-paramer |  at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210)
miko-paramer |  at org.springframework.core.env.AbstractPropertyResolver.resolveNestedPlaceholders(AbstractPropertyResolver.java:227)
miko-paramer |  at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:83)
miko-paramer |  at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:61)
miko-paramer |  at org.springframework.core.env.AbstractEnvironment.getProperty(AbstractEnvironment.java:530)
miko-paramer |  at org.springframework.core.env.AbstractEnvironment.doGetActiveProfiles(AbstractEnvironment.java:240)
miko-paramer |  at org.springframework.core.env.AbstractEnvironment.getActiveProfiles(AbstractEnvironment.java:226)
miko-paramer |  at org.springframework.boot.SpringApplication.configureProfiles(SpringApplication.java:531)
miko-paramer |  at org.springframework.boot.SpringApplication.configureEnvironment(SpringApplication.java:454)
miko-paramer |  at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:335)
miko-paramer |  at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
miko-paramer |  at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162)
miko-paramer |  at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151)
miko-paramer |  at com.miko.paramer.ParamerApplication.main(ParamerApplication.java:18)
miko-paramer |  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
miko-paramer |  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
miko-paramer |  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
miko-paramer |  at java.lang.reflect.Method.invoke(Method.java:498)
miko-paramer |  at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
miko-paramer |  at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
miko-paramer |  at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
miko-paramer |  at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)
miko-paramer exited with code 1

可以看到profile 没有被替换，并且在日志PROFILE 中显示为大写

我该如何解决？

Answer 1

来自docker compose-file reference：

ARGS

添加构建参数，它们是只能在构建过程中访问的环境变量。

根据您的用例，我认为您需要指定 environment 而不是 args。

环境

添加环境变量。

虽然你总是可以有以下解决方法：

ARG buildtime_variable=default_value
ENV env_var_name=$buildtime_variable

来源：Setting Default Docker Environment Variables During Image Build