等待容器端口打开超时（本地主机端口：[32773] 应该正在侦听）

Question

我正在尝试使用https://www.testcontainers.org/固有的https://github.com/testcontainers/testcontainers-scala，如下所示：

final class MessageSpec extends BddSpec
  with ForAllTestContainer
  with BeforeAndAfterAll {


  override val container = GenericContainer("sweetsoft/sapmock").configure{ c =>
    c.addExposedPort(8080)
    c.withNetwork(Network.newNetwork())
  }

  override def beforeAll() {
  }


  feature("Process incoming messages") {  

当我使用命令运行测试时sbt test，出现以下异常：

15:22:23.171 [pool-7-thread-2] ERROR  [sweetsoft/sapmock:latest] - Could not start container
org.testcontainers.containers.ContainerLaunchException: Timed out waiting for container port to open (localhost ports: [32775] should be listening)
        at org.testcontainers.containers.wait.strategy.HostPortWaitStrategy.waitUntilReady(HostPortWaitStrategy.java:47)
        at org.testcontainers.containers.wait.strategy.AbstractWaitStrategy.waitUntilReady(AbstractWaitStrategy.java:35)
        at org.testcontainers.containers.wait.HostPortWaitStrategy.waitUntilReady(HostPortWaitStrategy.java:23)
        at org.testcontainers.containers.wait.strategy.AbstractWaitStrategy.waitUntilReady(AbstractWaitStrategy.java:35)
        at org.testcontainers.containers.GenericContainer.waitUntilContainerStarted(GenericContainer.java:582)

该图像是本地图像：

docker images
REPOSITORY                    TAG                 IMAGE ID            CREATED             SIZE
sweetsoft/sapmock             latest              f02be90356e7        3 hours ago         664MB
openjdk                       8                   bec43387959a        11 days ago         625MB
quay.io/testcontainers/ryuk   0.2.3               64849fd2d464        3 months ago        10.7MB

问题是，它为什么要等待32775端口？港口有什么用？

更新

也许这个日志会有所帮助：

15:47:47.274 [pool-7-thread-4] INFO org.testcontainers.dockerclient.DockerClientProviderStrategy - Found Docker environment with Environment variables, system properties and defaults. Resolved: 
    dockerHost=unix:///var/run/docker.sock
    apiVersion='{UNKNOWN_VERSION}'
    registryUrl='https://index.docker.io/v1/'
    registryUsername='developer'
    registryPassword='null'
    registryEmail='null'
    dockerConfig='DefaultDockerClientConfig[dockerHost=unix:///var/run/docker.sock,registryUsername=developer,registryPassword=<null>,registryEmail=<null>,registryUrl=https://index.docker.io/v1/,dockerConfigPath=/home/developer/.docker,sslConfig=<null>,apiVersion={UNKNOWN_VERSION},dockerConfig=<null>]'

15:47:47.275 [pool-7-thread-4] INFO org.testcontainers.DockerClientFactory - Docker host IP address is localhost
15:47:47.277 [pool-7-thread-4] DEBUG com.github.dockerjava.core.command.AbstrDockerCmd - Cmd: com.github.dockerjava.core.exec.InfoCmdExec@51a07bb5
15:47:47.389 [pool-7-thread-4] DEBUG com.github.dockerjava.core.command.AbstrDockerCmd - Cmd: com.github.dockerjava.core.exec.VersionCmdExec@70fc9b37
15:47:47.392 [pool-7-thread-4] INFO org.testcontainers.DockerClientFactory - Connected to docker: 
  Server Version: 18.09.6
  API Version: 1.39
  Operating System: Ubuntu 18.04.2 LTS
  Total Memory: 7976 MB
15:47:47.395 [pool-7-thread-4] DEBUG com.github.dockerjava.core.command.AbstrDockerCmd - Cmd: ListImagesCmdImpl[imageNameFilter=quay.io/testcontainers/ryuk:0.2.3,showAll=false,filters=com.github.dockerjava.core.util.FiltersBuilder@0,execution=com.github.dockerjava.core.exec.ListImagesCmdExec@562a343]
15:47:47.417 [pool-7-thread-4] DEBUG org.testcontainers.utility.RegistryAuthLocator - Looking up auth config for image: quay.io/testcontainers/ryuk:0.2.3
15:47:47.417 [pool-7-thread-4] DEBUG org.testcontainers.utility.RegistryAuthLocator - RegistryAuthLocator has configFile: /home/developer/.docker/config.json (does not exist) and commandPathPrefix: 
15:47:47.418 [pool-7-thread-4] WARN org.testcontainers.utility.RegistryAuthLocator - Failure when attempting to lookup auth config (dockerImageName: quay.io/testcontainers/ryuk:0.2.3, configFile: /home/developer/.docker/config.json. Falling back to docker-java default behaviour. Exception message: /home/developer/.docker/config.json (No such file or directory)
15:47:47.418 [pool-7-thread-4] DEBUG org.testcontainers.dockerclient.auth.AuthDelegatingDockerClientConfig - Effective auth config [null]

Answer 1

原始的java库已经回答了你的端口问题。
https://www.testcontainers.org/features/networking/

请注意，这个暴露的端口号是从容器的角度来看的。

从主机的角度来看，测试容器实际上将其暴露在随机的空闲端口上。这是设计使然，以避免本地运行的软件或并行测试运行之间可能出现的端口冲突。

由于存在这一层间接性，因此需要在运行时向 Testcontainers 询问实际映射的端口。这可以使用 getMappedPort 方法来完成，该方法将原始（容器）端口作为参数

在 Scala 库中，您可以通过调用获取此映射端口

container.mappedPort(yourExposedPort) 

错误很可能与这个概念有关，您需要提前在 docker 映像中公开该端口。确保expose 8080您的 dockerfile 中的某个位置有命令，或者用于构建您的镜像的任何镜像都有该命令