docker - 无法使用其 IP 地址连接到 docker 容器

Question

我正在使用 docker-compose 启动一些容器，这些容器形成了 Solr 和 Zookeeper 节点的集群。

这是我的撰写文件(取自 here ):

version: '3.8'
services:
  solr1:
    image: solr:8.7.0
    container_name: solr1
    ports:
     - "8981:8983"
    environment:
      - ZK_HOST=zoo1:2181,zoo2:2181,zoo3:2181
    networks:
      - solr
    depends_on:
      - zoo1
      - zoo2
      - zoo3

  solr2:
    image: solr:8.7.0
    container_name: solr2
    ports:
     - "8982:8983"
    environment:
      - ZK_HOST=zoo1:2181,zoo2:2181,zoo3:2181
    networks:
      - solr
    depends_on:
      - zoo1
      - zoo2
      - zoo3

  solr3:
    image: solr:8.7.0
    container_name: solr3
    ports:
     - "8983:8983"
    environment:
      - ZK_HOST=zoo1:2181,zoo2:2181,zoo3:2181
    networks:
      - solr
    depends_on:
      - zoo1
      - zoo2
      - zoo3

  zoo1:
    image: zookeeper:3.6.2
    container_name: zoo1
    restart: always
    hostname: zoo1
    ports:
      - 2181:2181
      - 7001:7000
    environment:
      ZOO_MY_ID: 1
      ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
      ZOO_4LW_COMMANDS_WHITELIST: mntr, conf, ruok
      ZOO_CFG_EXTRA: "metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider metricsProvider.httpPort=7000 metricsProvider.exportJvmInfo=true"
    networks:
      - solr

  zoo2:
    image: zookeeper:3.6.2
    container_name: zoo2
    restart: always
    hostname: zoo2
    ports:
      - 2182:2181
      - 7002:7000
    environment:
      ZOO_MY_ID: 2
      ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
      ZOO_4LW_COMMANDS_WHITELIST: mntr, conf, ruok
      ZOO_CFG_EXTRA: "metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider metricsProvider.httpPort=7000 metricsProvider.exportJvmInfo=true"
    networks:
      - solr

  zoo3:
    image: zookeeper:3.6.2
    container_name: zoo3
    restart: always
    hostname: zoo3
    ports:
      - 2183:2181
      - 7003:7000
    environment:
      ZOO_MY_ID: 3
      ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
      ZOO_4LW_COMMANDS_WHITELIST: mntr, conf, ruok
      ZOO_CFG_EXTRA: "metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider metricsProvider.httpPort=7000 metricsProvider.exportJvmInfo=true"
    networks:
      - solr

networks:
  solr:

如果我运行 docker compose ls，我会看到项目正在正确运行:

NAME                STATUS
solr-cluster        running(6)

这是 docker container ls 的输出:

CONTAINER ID   IMAGE          COMMAND                  CREATED        STATUS          PORTS                                                                                                                NAMES
d5333378e78c   25b74ae1e488   "docker-entrypoint.s…"   23 hours ago   Up 52 minutes   0.0.0.0:8983->8983/tcp, :::8983->8983/tcp                                                                            solr3
5fac27cd0443   25b74ae1e488   "docker-entrypoint.s…"   23 hours ago   Up 52 minutes   0.0.0.0:8982->8983/tcp, :::8982->8983/tcp                                                                            solr2
db37ef90ca98   25b74ae1e488   "docker-entrypoint.s…"   23 hours ago   Up 52 minutes   0.0.0.0:8981->8983/tcp, :::8981->8983/tcp                                                                            solr1
b8b55694e281   a72350516291   "/docker-entrypoint.…"   23 hours ago   Up 52 minutes   2888/tcp, 3888/tcp, 8080/tcp, 0.0.0.0:2183->2181/tcp, :::2183->2181/tcp, 0.0.0.0:7003->7000/tcp, :::7003->7000/tcp   zoo3
10885eafe4e8   a72350516291   "/docker-entrypoint.…"   23 hours ago   Up 52 minutes   2888/tcp, 3888/tcp, 8080/tcp, 0.0.0.0:2182->2181/tcp, :::2182->2181/tcp, 0.0.0.0:7002->7000/tcp, :::7002->7000/tcp   zoo2
558f8574c036   a72350516291   "/docker-entrypoint.…"   23 hours ago   Up 52 minutes   2888/tcp, 3888/tcp, 0.0.0.0:2181->2181/tcp, :::2181->2181/tcp, 8080/tcp, 0.0.0.0:7001->7000/tcp, :::7001->7000/tcp   zoo1

如果我尝试使用主机 localhost(例如 http://localhost:8983/)通过我的浏览器导航 solr 节点，容器会正确响应 Solr管理界面。

但是，如果我尝试使用我的浏览器访问同一个容器，但来自其 IP(例如 http://172.23.0.7:8983/，其中 172.23.0.7 是 solr3 容器的 IP)我收到连接超时。如果我尝试 ping 该 IP，我也会遇到连接超时。

为什么会这样？ localhost 和 172.23.0.7 主机不应该都工作吗？

我需要从容器的 IP 访问我的容器，因为 Solr 节点使用它们的 IP 注册到 Zookeeper。因此，由于我无法从它们的 IP 访问容器，所以当我尝试通过 SolrJ API 以编程方式连接到它们时，我得到一个 ConnectionTimeout 异常:

public static void main(String[] args)
{
    List<String> zkNodes = new ArrayList<>(3);

    zkNodes.add("localhost:2181");
    zkNodes.add("localhost:2182");
    zkNodes.add("localhost:2183");

    SolrClient solrClient = new CloudSolrClient.Builder(zkNodes, Optional.empty())
        .withConnectionTimeout(10000)
        .withSocketTimeout(10000)
        .build();

    try
    {
        CollectionAdminRequest.listCollections(solrClient);
    }
    catch (IOException | SolrServerException e)
    {
        e.printStackTrace();
    }
}

这是我得到的异常:

org.apache.solr.client.solrj.SolrServerException: IOException occurred when talking to server at: http://172.23.0.7:8983/solr
    at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:695)
    at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:266)
    at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:248)
    at org.apache.solr.client.solrj.impl.LBSolrClient.doRequest(LBSolrClient.java:370)
    at org.apache.solr.client.solrj.impl.LBSolrClient.request(LBSolrClient.java:298)
    at org.apache.solr.client.solrj.impl.BaseCloudSolrClient.sendRequest(BaseCloudSolrClient.java:1157)
    at org.apache.solr.client.solrj.impl.BaseCloudSolrClient.requestWithRetryOnStaleState(BaseCloudSolrClient.java:918)
    at org.apache.solr.client.solrj.impl.BaseCloudSolrClient.request(BaseCloudSolrClient.java:850)
    at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:214)
    at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:231)
    at org.apache.solr.client.solrj.request.CollectionAdminRequest.listCollections(CollectionAdminRequest.java:2690)
    at Main.main(Main.java:28)
Caused by: org.apache.http.conn.ConnectTimeoutException: Connect to 172.23.0.7:8983 [/172.23.0.7] failed: connect timed out
    at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:151)
Caused by: org.apache.http.conn.ConnectTimeoutException: Connect to 172.23.0.7:8983 [/172.23.0.7] failed: connect timed out
    at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:374)
    at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:393)
    at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
    at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)
    at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
    at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
    at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
    at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:571)
    ... 11 more
Caused by: java.net.SocketTimeoutException: connect timed out
Caused by: java.net.SocketTimeoutException: connect timed out
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75)
    at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
    ... 21 more

我不知道它是否有帮助，但无论如何我在 Windows 主机上，所以我不能为 Docker 使用 --network host 标志。

Answer 1

172.x.x.x IP 是只能在 Docker 网络内访问的 IP，即 Solr 和 Zookeeper 节点之间。

当您从外部连接到 Zookeeper 时，Zookeeper 不知道有一个“外部”，它只知道其网络中 Solr 服务器的 IP 并将它们发送回给您。但这些 IP 无法从“外部”访问。

一种解决方法是直接连接到 Solr 服务器而不是使用 Zookeeper(使用像 localhost:8981 和 HttpSolrClient 这样的 URL)。

或者，您需要告诉 Solr 服务器将其自身与外部 IP“呈现”给 Zookeeper。