/// tip | Tipp

Machen Sie sich keine Sorgen, wenn einige dieser Punkte zu **Containern**, Docker oder Kubernetes noch nicht viel Sinn ergeben.

Ich werde Ihnen in einem zukünftigen Kapitel mehr über Container-Images, Docker, Kubernetes, usw. erzählen: [FastAPI in Containern – Docker](docker.md){.internal-link target=_blank}.

///

## Schritte vor dem Start

    steps:
      - name: Checkout
        uses: actions/checkout@v5

      - name: Configure JDK
        uses: actions/setup-java@v5
        with:
          distribution: 'zulu'
          java-version: 17

      - name: Setup Gradle
        uses: gradle/actions/setup-gradle@v4

      - name: Run Container Tests

- github.com/containerd/containerd/api: [v1.7.19](https://github.com/containerd/containerd/tree/api/v1.7.19)
- github.com/containerd/errdefs: [v0.1.0](https://github.com/containerd/errdefs/tree/v0.1.0)
- github.com/containerd/log: [v0.1.0](https://github.com/containerd/log/tree/v0.1.0)
- github.com/containerd/typeurl/v2: [v2.2.0](https://github.com/containerd/typeurl/tree/v2.2.0)

When the **container** is started and running (started from a **container image**) it could create or change files, environment variables, etc. Those changes will exist only in that container, but would not persist in the underlying container image (would not be saved to disk).

A container image is comparable to the **program** file and contents, e.g. `python` and some file `main.py`.

import org.mockserver.model.HttpRequest.request
import org.mockserver.model.HttpResponse.response
import org.testcontainers.containers.GenericContainer
import org.testcontainers.containers.MockServerContainer
import org.testcontainers.containers.Network
import org.testcontainers.junit.jupiter.Container
import org.testcontainers.junit.jupiter.Testcontainers
import org.testcontainers.utility.DockerImageName

@Testcontainers

- github.com/containerd/containerd/api: [v1.7.19 → v1.8.0](https://github.com/containerd/containerd/compare/api/v1.7.19...api/v1.8.0)
- github.com/containerd/errdefs: [v0.1.0 → v1.0.0](https://github.com/containerd/errdefs/compare/v0.1.0...v1.0.0)
- github.com/containerd/ttrpc: [v1.2.5 → v1.2.6](https://github.com/containerd/ttrpc/compare/v1.2.5...v1.2.6)

        return attrs;
    }
}

/**
* HTML API: If current script has container(s) specified, initialise Termynal.
*/
if (document.currentScript.hasAttribute('data-termynal-container')) {
    const containers = document.currentScript.getAttribute('data-termynal-container');
    containers.split('|')
        .forEach(container => new Termynal(container))

import java.util.concurrent.Executors
import okhttp3.Dispatcher
import okhttp3.HttpUrl.Companion.toHttpUrl
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.containers.BasicMockServerTest.Companion.MOCKSERVER_IMAGE
import okhttp3.containers.BasicMockServerTest.Companion.trustMockServer
import okhttp3.testing.PlatformRule
import org.junit.jupiter.api.AfterEach
import org.junit.jupiter.api.BeforeEach

```sh
docker ps -a
```

`-a` flag makes sure you get all the containers (Created, Running, Exited). Then identify the `Container ID` from the output.

### Starting and Stopping Containers

To start a stopped container, you can use the [`docker start`](https://docs.docker.com/engine/reference/commandline/start/) command.

```sh
docker start <container_id>
```

import org.mockserver.socket.tls.KeyStoreFactory
import org.testcontainers.containers.MockServerContainer
import org.testcontainers.junit.jupiter.Container
import org.testcontainers.junit.jupiter.Testcontainers
import org.testcontainers.utility.DockerImageName

@Testcontainers
class BasicMockServerTest {
  @Container
  val mockServer: MockServerContainer = MockServerContainer(MOCKSERVER_IMAGE)

  val client =