Docker无法连接到运行在同一服务器上的数据库

Question

我有两个对接图像，1)用于couchdb和2)一个web应用程序。web应用程序无法与运行在同一台机器上的couchdb对话。

当我直接访问couchdb时，它正在运行utils/#数据库/ utils/#数据库/。

我漏掉了什么指点？

| Caused by: org.apache.http.conn.HttpHostConnectException: Connect to localhost:5984 [localhost/127.0.0.1] failed: Connection refused (Connection refused)
hashgraph_1  |  at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:159)
hashgraph_1  |  at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:359)
hashgraph_1  |  at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:381)
hashgraph_1  |  at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
hashgraph_1  |  at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
hashgraph_1  |  at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
hashgraph_1  |  at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
hashgraph_1  |  at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
hashgraph_1  |  at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:72)
hashgraph_1  |  at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)

我的船坞撰写文件

version: "3"
services:
  hashgraph:
    build: "./"
    depends_on:
      - couchdb
    deploy:
      replicas: 1
      restart_policy:
        condition: always
    ports:
      - "51200-51299:51200-51299"
  couchdb:
    image: couchdb:2.1
    ports:
      - "5984:5984"
    deploy:
      replicas: 1
      restart_policy:
        condition: always

船坞输出ps

CONTAINER ID        IMAGE                            COMMAND                  CREATED              STATUS              PORTS                                                   NAMES
cc7e37cd6260        hashgraphexperiments_hashgraph   "java -jar swirlds.j…"   About a minute ago   Up About a minute   50200-50299/tcp, 0.0.0.0:51200-51299->51200-51299/tcp   hashgraphexperiments_hashgraph_1
9f4767b36aea        couchdb:2.1                      "tini -- /docker-ent…"   2 hours ago          Up About a minute   4369/tcp, 9100/tcp, 0.0.0.0:5984->5984/tcp              hashgraphexperiments_couchdb_1

Answer 1

depends_on：它只是等待另一个容器启动。

每当您想从couchdb容器代码调用hashgraph时，都需要使用couchdb:5984而不是localhost:5984

网络写作

您还可以显式地使用links条目而不是depends_on。

对链接的描述是

链接：链接到另一个服务中的容器。要么指定服务名称和链接别名( service :别名)，要么只指定服务名称。

链接还以与depends_on相同的方式表示服务之间的依赖关系，因此它们决定服务启动的顺序。

version: "3"
services:
  hashgraph:
    build: .
    links:
      - couchdb:couchdb
    deploy:
      replicas: 1
      restart_policy:
        condition: always
    ports:
      - "51200-51299:51200-51299"
  couchdb:
    image: couchdb:2.1
    ports:
      - 5984:5984
    deploy:
      replicas: 1
      restart_policy:
        condition: always