Spring Boot应用使用docker-java库无法连接Docker守护进程的问题求助

我正尝试通过docker-java库将我的Spring Boot应用连接到Docker守护进程，但遇到了如下错误：

java.lang.RuntimeException: org.apache.hc.client5.http.HttpHostConnectException: Connect to unix://localhost:2375 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused
    at com.github.dockerjava.httpclient5.ApacheDockerHttpClientImpl.execute(ApacheDockerHttpClientImpl.java:210) ~[docker-java-transport-httpclient5-3.4.1.jar:na]
    at com.github.dockerjava.httpclient5.ApacheDockerHttpClient.execute(ApacheDockerHttpClient.java:9) ~[docker-java-transport-httpclient5-3.4.1.jar:na]
    at com.github.dockerjava.core.DefaultInvocationBuilder.execute(DefaultInvocationBuilder.java:228) ~[docker-java-core-3.4.1.jar:na]
    at com.github.dockerjava.core.DefaultInvocationBuilder.post(DefaultInvocationBuilder.java:124) ~[docker-java-core-3.4.1.jar:na]
    at com.github.dockerjava.core.exec.CreateContainerCmdExec.execute(CreateContainerCmdExec.java:37) ~[docker-java-core-3.4.1.jar:na]
    at com.github.dockerjava.core.exec.CreateContainerCmdExec.execute(CreateContainerCmdExec.java:13) ~[docker-java-core-3.4.1.jar:na]
    at com.github.dockerjava.core.exec.AbstrSyncDockerCmdExec.exec(AbstrSyncDockerCmdExec.java:21) ~[docker-java-core-3.4.1.jar:na]
    at com.github.dockerjava.core.command.AbstrDockerCmd.exec(AbstrDockerCmd.java:33) ~[docker-java-core-3.4.1.jar:na]
    at com.github.dockerjava.core.command.CreateContainerCmdImpl.exec(CreateContainerCmdImpl.java:608) ~[docker-java-core-3.4.1.jar:na]

配置详情 #

我在Docker配置里是这样定义客户端的：

@Bean
public DockerClientConfig dockerClientConfig() {
    return DefaultDockerClientConfig.createDefaultConfigBuilder()
            .withDockerHost("unix:///var/run/docker.sock")
            .build();
}

@Bean
public DockerHttpClient httpClient(DockerClientConfig config) {
    return new ApacheDockerHttpClient.Builder()
            .dockerHost(config.getDockerHost())
            .maxConnections(100)
            .connectionTimeout(Duration.ofSeconds(30))
            .responseTimeout(Duration.ofSeconds(45))
            .build();
}

POM文件 #

我的pom.xml里引入了这些依赖：

<dependency>
    <groupId>com.github.docker-java</groupId>
    <artifactId>docker-java</artifactId>
    <version>3.4.1</version>
</dependency>
<dependency>
    <groupId>com.github.docker-java</groupId>
    <artifactId>docker-java-transport-httpclient5</artifactId>
    <version>3.4.1</version>
</dependency>

Docker守护进程配置 #

这是我的Docker守护进程配置内容：

{
  "builder": {
    "gc": {
      "defaultKeepStorage": "20GB",
      "enabled": true
    }
  },
  "experimental": false,
  "hosts": [
    "unix:///var/run/docker.sock",
    "unix://localhost:2375",
    "tcp://127.0.0.1:2375"
  ]
}

备注：内容来源于stack exchange，提问作者Deshy Dan