Java args config for Docker

Question

I'm doing docker container with java. But how should it be jar args config?

i think:

if (args.length == 2) new Listen().run(args[0],args[1]);
    else System.out.println("Ex: docker run -it -e MQTT_HOST=localhost:1883 -e MQTT_TOPIC=test mqtt");
    System.exit(1);

is it true?

Pandey Amit · Accepted Answer · 2020-08-25 09:37:12Z

1

You can pass java args directly to docker run like. docker run <image> java-args1 java-args2

    docker run test-image:latest args1 args2

But, I would prefer to use System.getenv("ARGS1"); method to read docker environment variables, like below.

public static void main(String args[]) {
    String args1 = System.getenv("ARGS1");
    System.out.println("Arguments from docker env : " + args1);
}

And, pass environment variable in docker..

      docker run -e ARGS1=testing-args test-image:latest

answered Aug 25, 2020 at 9:37

Pandey Amit

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