How do you set environment variables?

I tried something like:

CreateContainerResponse containerResponse = dockerClient.createContainerCmd("testApp")
            .withEnv("DISPLAY=$DISPLAY")
            .exec();

but this doesn’t seem to work. The $DISPLAY mentioned is supposed to be the value of the environment variable on the Ubuntu system where the docker daemon is running. I verified that it’s properly defined.

[orzeh]

@Shanky2304 In https://docs.docker.com/engine/reference/run/#env-environment-variables :

If the operator names an environment variable without specifying a value, then the current value of the named variable is propagated into the container’s environment

In that case AFAIK the value is read from client environment.

Back to your example, you can read DISPLAY env variable and pass it to Java code:

String dispayVarValue = System.getEnv(...);
CreateContainerResponse containerResponse = dockerClient.createContainerCmd("testApp")
            .withEnv("DISPLAY=" + dispayVarValue)
            .exec();

It that code runs on docker daemon you will get what you want.

[Shanky2304]

@orzeh I’m sorry, I don’t understand. What do you mean I don’t have access? What should have I done differently?