Can't connect to Docker running in WSL2 VM if Testcontainers runs on Windows and Docker Desktop is not used

Test container failed to start and throws Exception when try to run test case.

Host system: Windows 10 WSL2 based system: Ubuntu App for windows Docker installed inside: Ubuntu App for windows

Using WSL2 based Ubuntu App on windows and setup docker in it. We are able to connect containers run inside it from host system i.e. Windows 10 through Ubuntu App IP address and port on which containers are running. In case of test containers it fails and throws below exception

Exception:

java.lang.IllegalStateException: Could not find a valid Docker environment. Please see logs and check configuration

	at org.testcontainers.dockerclient.DockerClientProviderStrategy.lambda$getFirstValidStrategy$7(DockerClientProviderStrategy.java:215)
	at java.util.Optional.orElseThrow(Optional.java:290)
	at org.testcontainers.dockerclient.DockerClientProviderStrategy.getFirstValidStrategy(DockerClientProviderStrategy.java:207)
	at org.testcontainers.DockerClientFactory.getOrInitializeStrategy(DockerClientFactory.java:136)
	at org.testcontainers.DockerClientFactory.client(DockerClientFactory.java:178)
	at org.testcontainers.LazyDockerClient.getDockerClient(LazyDockerClient.java:14)
	at org.testcontainers.LazyDockerClient.authConfig(LazyDockerClient.java:12)
	at org.testcontainers.containers.GenericContainer.start(GenericContainer.java:310)
	at infrastructure.DatabaseContainer.start(DatabaseContainer.java:30)
	at com.ecw.hplus.chat.ChannelFeatureShould.before(ChannelFeatureShould.java:70)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
	at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
	at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)

Test case file:

import infrastructure.DatabaseContainer;
import infrastructure.MySqlDatabaseContainer;

import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

@RunWith(Parameterized.class)
public class AFeatureShould extends SimpleRepositoryTest {

    private static final MySqlDatabaseContainer mysql = new MySqlDatabaseContainer("mysql.sql");
    
    @Parameterized.Parameters
    public static DatabaseContainer[] getDatabaseContainer() {
        return new DatabaseContainer[]{
                mysql
        };
    }

    @BeforeClass
    public static void before() {
        mysql.start();
    }

    @Test
    public void test() {
        // assertions
    }
}

Tried to mitigate this issue by modifying /etc/docker/deamon.json and C:/Users/myuser/.testcontainers.properties files and not succeeded.

/etc/docker/deamon.json:

{
        "hosts": ["unix:///var/run/docker.sock", "tcp://127.0.0.1:2375"]
}

C:/Users/myuser/.testcontainers.properties:

docker.client.strategy=org.testcontainers.dockerclient.NpipeSocketClientProviderStrategy
docker.host=tcp\://<ip-of-ubuntu-app>\:2375

[sz763]

I had faced with same issue. The following steps fixed it https://gist.github.com/sz763/3b0a5909a03bf2c9c5a057d032bd98b7, I hope it will help you. UPD: saurabh4studies pay attention, you’ve incorrect file name deamon.json , it must be daemon.json.

[eddumelendez]

Closing due to it is resolved.