## O que é uma Imagem de Contêiner { #what-is-a-container-image }

Um **contêiner** roda a partir de uma **imagem de contêiner**.

- github.com/aws/aws-sdk-go: [v1.38.49 → v1.44.116](https://github.com/aws/aws-sdk-go/compare/v1.38.49...v1.44.116)
- github.com/container-storage-interface/spec: [v1.6.0 → v1.7.0](https://github.com/container-storage-interface/spec/compare/v1.6.0...v1.7.0)
- github.com/containerd/ttrpc: [v1.0.2 → v1.1.0](https://github.com/containerd/ttrpc/compare/v1.0.2...v1.1.0)

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`.

/// info | Info

Wenn Sie Container verwenden, beispielsweise mit Docker oder Kubernetes, erzähle ich Ihnen mehr darüber im nächsten Kapitel: [FastAPI in Containern – Docker](docker.md){.internal-link target=_blank}.

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

  * You can now set container requests, container limits, and node allocatable reservations for the new `ephemeral-storage` resource.

  * The `ephemeral-storage` resource includes all the disk space a container might consume with container overlay or scratch.

* [alpha] Mount namespace propagation

  * The `VolumeMount.Propagation` field for `VolumeMount` in pod containers is now available.

- github.com/container-storage-interface/spec: [v1.7.0 → v1.8.0](https://github.com/container-storage-interface/spec/compare/v1.7.0...v1.8.0)
- github.com/containerd/cgroups: [v1.0.1 → v1.1.0](https://github.com/containerd/cgroups/compare/v1.0.1...v1.1.0)
- github.com/containerd/ttrpc: [v1.1.0 → v1.2.2](https://github.com/containerd/ttrpc/compare/v1.1.0...v1.2.2)

### Container Images

All container images are available as manifest lists and support the described
architectures. It is also possible to pull a specific architecture directly by
adding the "-$ARCH" suffix  to the container image name.

name | architectures
---- | -------------

    steps:
      - name: Stop old running containers (if any)
        shell: bash
        run: |
          running_containers=$(docker ps -q) && \
          if [[ $running_containers == "" ]]; then
            echo "No running containers";
          else
            echo "Running container(s) found" && \
            docker stop $running_containers;
          fi
          docker container prune -f
          docker image prune -af

import org.mockserver.proxyconfiguration.ProxyConfiguration
import org.mockserver.socket.tls.KeyStoreFactory
import org.testcontainers.containers.MockServerContainer
import org.testcontainers.junit.jupiter.Container
import org.testcontainers.junit.jupiter.Testcontainers

@Testcontainers
class BasicProxyTest {
  @Container
  val mockServer: MockServerContainer =
    MockServerContainer(MOCKSERVER_IMAGE)
      .withNetworkAliases("mockserver")