java.lang.AssertionError: Docker environment has more than 2GB free

Question

I have been creating tests for my program that uses docker. And everything was working well until suddently I face this problem at the start of any test

ℹ︎ Checking the system...
    ✔ Docker version is newer than 1.6.0
    ✘ Docker environment has more than 2GB free

Test ignored.

Test ignored.

java.lang.AssertionError: Docker environment has more than 2GB free

at org.rnorth.visibleassertions.VisibleAssertions.fail(VisibleAssertions.java:437)
at org.rnorth.visibleassertions.VisibleAssertions.assertTrue(VisibleAssertions.java:129)
at org.testcontainers.DockerClientFactory.checkDiskSpace(DockerClientFactory.java:168)
at org.testcontainers.DockerClientFactory.lambda$client$1(DockerClientFactory.java:127)
at org.testcontainers.DockerClientFactory.runInsideDocker(DockerClientFactory.java:230)
at org.testcontainers.DockerClientFactory.client(DockerClientFactory.java:118)
at org.testcontainers.containers.GenericContainer.<init>(GenericContainer.java:116)
at my.project.historyservice.MongoDBTest.<clinit>(MongoDBTest.java:24)
at sun.misc.Unsafe.ensureClassInitialized(Native Method)
at sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:43)
at sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:156)
at java.lang.reflect.Field.acquireFieldAccessor(Field.java:1088)
at java.lang.reflect.Field.getFieldAccessor(Field.java:1069)
at java.lang.reflect.Field.get(Field.java:393)
at org.junit.runners.model.FrameworkField.get(FrameworkField.java:73)
at org.junit.runners.model.TestClass.getAnnotatedFieldValues(TestClass.java:230)
at org.junit.runners.ParentRunner.classRules(ParentRunner.java:255)
at org.junit.runners.ParentRunner.withClassRules(ParentRunner.java:244)
at org.junit.runners.ParentRunner.classBlock(ParentRunner.java:194)
at org.junit.runners.ParentRunner.run(ParentRunner.java:362)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

The class MongoDBTest starts with:

public class MongoDBTest
{
  @ClassRule
  public static GenericContainer mongodb = new GenericContainer("mongo:3.6")
          .withExposedPorts(27017)
          .waitingFor(Wait.forListeningPort());

With line 24 being the one where I call "new GenericContainer"

I cant figure out what can be the problem. My computer has 16GB of RAM, out of which about 10GB should be free. I ran the test about 10 times successfully today before the problem arose, and I have tried restarting computer but it didnt help.

Thank you! I got the problem fixed by deleting some files from my disk. — CodeMasterLeader123
– CodeMasterLeader123, Commented Mar 5, 2019 at 14:38
In my case, even if I had removed files from the disk, only that worked was this command: docker stop $(docker ps -a -q);docker kill $(docker ps -q);docker rm $(docker ps -a -q);docker rmi $(docker images -q) — pafede2
– pafede2, Commented Aug 5, 2019 at 15:02

Ansel Zandegran · Accepted Answer · 2021-10-01 08:41:56Z

5

docker rmi $(docker images -q) does the trick thanks to @pafede2

answered Oct 1, 2021 at 8:41

Ansel Zandegran

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Comments

Martín Zaragoza · Accepted Answer · 2025-09-23 12:29:28Z

Sometimes volume data is the culprit (at least it was for me).

Removing unused volumes and dangling images data can free up a lot of space.

Try running docker system prune --volumes

This command removes:

all stopped containers
all networks not used by at least one container
all volumes not used by at least one container
all dangling images
all dangling build cache

In my case it freed up close to 32GB of disk space

Hope this helps

Update 2025 ========================

Following instructions from this site https://depot.dev/blog/docker-clear-cache

Sometimes the issue is dangling layers occupying space

To get rid of them, run docker system prune -a

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