Package org.apache.commons.lang3

Class RuntimeEnvironment

java.lang.Object

org.apache.commons.lang3.RuntimeEnvironment

public class RuntimeEnvironment
extends Object

Helps query the runtime environment.

Since:

3.15.0

Constructor Summary

Constructors

Constructor	Description
RuntimeEnvironment()	Deprecated. Will be removed in 4.0.0.

Method Summary

Modifier and Type	Method	Description
static Boolean	inContainer()	Tests whether we are running in a container like Docker or Podman.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

RuntimeEnvironment

@Deprecated
public RuntimeEnvironment()

Deprecated.

Will be removed in 4.0.0.

Constructs a new instance.

Method Details

inContainer

public static Boolean inContainer()

Tests whether we are running in a container like Docker or Podman.

The following may change if we find better detection logic.

We roughly follow the logic in SystemD:

https://github.com/systemd/systemd/blob/0747e3b60eb4496ee122066c844210ce818d76d9/src/basic/virt.c#L692

We check the `container` environment variable of process 1:

1. If the variable is empty, we return false. This includes the case, where the container developer wants to hide the fact that the application runs in a container.
2. If the variable is not empty, we return true.
3. If the variable is absent, we continue.
4. We check files in the container. According to SystemD:/
   1. /.dockerenv is used by Docker.
   2. /run/.containerenv is used by PodMan.

Returns:

whether we are running in a container like Docker or Podman. Never null.

See Also:

• SystemD virt.c