Package org.eclipse.hono.util

Class KubernetesContainerUtil

java.lang.Object

org.eclipse.hono.util.KubernetesContainerUtil

public class KubernetesContainerUtil
extends Object

Locate the current docker container.

This class has been copied from org.apache.logging.log4j.kubernetes.ContainerUtil from the log4j-kubernetes module of the Apache Log4j 2 project (commit a50abb9). Adaptations have been done concerning the used logger and the Hono code style. Also a fix regarding cri-containerd container ids has been applied.

Method Summary

Modifier and Type	Method	Description
static String	getContainerId()	Returns the container id when running in a Docker container.

Methods inherited from class java.lang.Object

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

Method Details

getContainerId

public static String getContainerId()

Returns the container id when running in a Docker container. This inspects /proc/self/cgroup looking for a Kubernetes Control Group. Once it finds one it attempts to isolate just the docker container id. There doesn't appear to be a standard way to do this, but it seems to be the only way to determine what the current container is in a multi-container pod. It would have been much nicer if Kubernetes would just put the container id in a standard environment variable.

See Stackoverflow for a discussion on retrieving the containerId. See ControlGroup for the original version of this. Not much is actually left but it provided good inspiration.

Returns:

The container id.