docker-compose env variables in own tomcat image-CodePudding

I build my own Docker image based on tomcat:9-jdk11-openjdk-buster. In my docker-compose I have a couple of variables which I want to pass to my spring boot kotlin module.

Part of my docker-compose.yml

version: '3.9'
services:
  tomcat:
    image: backend:latest
    ports:
      - "8080:8080"
      - "5005:5005"
    container_name: tomcat
    environment:
      my-app_env_one: something
      spring_datasource_username: user

If I use the "tomcat:9-jdk11-openjdk-buster" as image the "my-app_env_one" variable is available. If I use my own docker image it's not there but the "spring_datasource_username" still is.

What am i doing wrong? Do i have to introduce the env variables in my dockerfile somewhere?

Dockerfile:

FROM tomcat:9-jdk11-openjdk-buster
COPY container/startContainer.sh /config/startContainer.sh

RUN ["chmod", " x", "/config/startContainer.sh"]

# in entrypoint script original entrypoint is called
ENTRYPOINT ["/config/startContainer.sh"]

part of my startContainer.sh:

#!/bin/sh

echo "-----Start tomcat-----"
catalina.sh run

I'm new to docker, so sorry if I got something completely wrong. So the image is running right now but I have no idea why i don't get the variables.

Thanks for any help

CodePudding user response：

Environment variables

Change - to _:

my-app_env_one -> my_app_env_one

Also you can enable debug=true in your spring boot or inspect your container docker inspect app_name to get more details.