等待容器端口打开超时（本地主机端口：[32773] 应该正在监听）

Question

我正在尝试按以下方式使用 https://github.com/testcontainers/testcontainers-scala that is inherent from https://www.testcontainers.org/：

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") {

当我运行使用命令 sbt test 进行测试时，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)

图片为本地图片：

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，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 java 库已回答您的端口问题。
https://www.testcontainers.org/features/networking/

Note that this exposed port number is from the perspective of the container.

From the host's perspective Testcontainers actually exposes this on a random free port. This is by design, to avoid port collisions that may arise with locally running software or in between parallel test runs.

Because there is this layer of indirection, it is necessary to ask Testcontainers for the actual mapped port at runtime. This can be done using the getMappedPort method, which takes the original (container) port as an argument

在 Scala 库中，您可以通过调用

来获取此映射端口

container.mappedPort(yourExposedPort)

错误很可能与此概念有关，您需要提前在 docker 映像中公开该端口。确保你的 docker 文件中某处有 expose 8080 命令，或者任何用于构建你的文件的图像都有它

等待容器端口打开超时（本地主机端口：[32773] 应该正在监听）

Timed out waiting for container port to open (localhost ports: [32773] should be listening)

java

scala

docker

testcontainers