Question 85245 in Docker Question posted in
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Java hidden properties without Spring – Docker

I am currently creating a Java program that uses a MongoDB database and I am storing the connection information in a properties file.

But my project is opensource on GitHub and I cannot store the connection information in the properties file.

And so I wanted to ask you if it is possible to give the login information from docker run.

example : docker run registry/image -args db.password=psw db.username=user

I have seen solutions in stackoverflow but all solutions use Spring features, but my project does not use Spring framework.

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3

Answers


  1. Chosen as BEST ANSWER
    0

    We have multiple solutions for this:

    Secret Docker

    Create a file with the properties syntax:

    //secret-file.txt
db.password=psw
db.username=user

    With this file create a docker secret in your docker :

    $ docker secret create test-secret secret-file.txt

    And use this with the java library docker-secrets in your java program :

    Map<String, String> secrets = DockerSecrets.loadFromFile("test-secret");
System.out.println(secrets.get("db.password")) // readonly

    For more example, look here.

    Environment variables

    Set the environment variables in the docker with -e argument :

    $ docker run -e DB_PASSWORD=pwd -e DB_USERNAME=user registry/image:tag

    And use these variables with System::getenv in your java program :

    System.out.println(System.getenv("DB_PASSWORD"))

    VM Arguments

    This solution depends on your base image that was used to create your Docker container.

    Give VM Arguments to the docker run command :

    $ docker run -e JAVA_OPTS="-Ddb.password=pwd -Ddb.username=user" registry/image:tag

    And use these variables with System::getProperty in your java program :

    System.out.println(System.getProperty("db.password"))

    Program arguments

    Give arguments to docker run command :

    It is important to give the arguments after declaring the image.

    $ docker run registry/image:tag pwd user

    And use these arguments with main method in your java program :

    public static void main(String[] args) {
    System.out.println("The password: " + args[0]);
    System.out.println("The username: " + args[1]);
}

    For better handling of arguments, you can use the Apache's commons-cli java library or use a another library.


  2. 0

    if you are hosting this application on AWS an option is using Secrets Manager which has an integration start project for Spring – How to integrate AWS Secret Manager with Spring Boot Application

    Login or Signup to reply.
  3. 0

    You can:

    • Use a .properties file for your properties

    • Add it to .gitignore so that you don’t push it to GitHub

    • Add a .properties_example file that contains placeholders for others to override in their local repo, e.g:

      db.password=<password>
db.username=<username>
    Login or Signup to reply.
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