无法通过 Play 框架服务器连接到 postgresql docker 容器答案

【问题标题】：Cannot connect to postgresql docker container through Play framework server无法通过 Play 框架服务器连接到 postgresql docker 容器
【发布时间】：2019-03-04 18:56:55
【问题描述】：

这是我的docker-compose.yml 文件

version: '3'
services:
    polymer:
        restart: always
        container_name: svcss_container
        build: 
            context: ./svcss
            args:
                POSTGRES_JDBC_URL: "jdbc:postgresql://127.0.0.1:5432/mydb_db"
                POSTGRES_USER: "mydb_user"
                POSTGRES_PASSWORD: "mydb_pass"
        ports:
            - "9090:9090"
        depends_on:
            - db
        links:
            - db:postgreshost

    db:
        container_name: pg_container
        restart: always
        image: postgres
        environment:
            POSTGRES_USER: "mydb_user"
            POSTGRES_DB: "mydb_db"
            POSTGRES_PASSWORD: "mydb_pass"
        ports:
            - "5432:5432"

这就是我将生产构建到svc/的方式

sbt dist
set -x
rm -rf svc/
unzip -d svc target/universal/*-1.0-SNAPSHOT.zip
mv svc/*/* svc/
rm svc/bin/*.bat
mv svc/bin/* svc/bin/start

还有./svcss 文件夹内的Dockerfile，它需要从target/universe/*.zip 提取的所有sbt dist 二进制文件到./svcss/svc/ 文件夹中。

FROM openjdk:8-jre
COPY svc /svc

ARG POSTGRES_JDBC_URL
ARG POSTGRES_USER
ARG POSTGRES_PASSWORD

ENV POSTGRES_JDBC_URL $POSTGRES_JDBC_URL
ENV POSTGRES_USER $POSTGRES_USER
ENV POSTGRES_PASSWORD $POSTGRES_PASSWORD

EXPOSE 9090
CMD /svc/bin/start -Dplay.http.secret.key="mysecretkeyishere123123123123"

但是在运行时使用

docker-compose up

我可以使用某些客户端从我的计算机连接到容器内的Postgres 数据库。但是svcss_container 无法运行进化，不知何故

svcss_container | Oops, cannot start the server.
svcss_container | java.sql.SQLTransientConnectionException: db - Connection is not available, request timed out after 1007ms.
svcss_container |   at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:548)
svcss_container |   at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:186)
svcss_container |   at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:145)
svcss_container |   at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:83)
svcss_container |   at slick.jdbc.hikaricp.HikariCPJdbcDataSource.createConnection(HikariCPJdbcDataSource.scala:14)
svcss_container |   at play.api.db.slick.evolutions.internal.DBApiAdapter$DatabaseAdapter.getConnection(DBApiAdapter.scala:57)
svcss_container |   at play.api.db.slick.evolutions.internal.DBApiAdapter$DatabaseAdapter.getConnection(DBApiAdapter.scala:60)
svcss_container |   at play.api.db.evolutions.DatabaseEvolutions.databaseEvolutions(EvolutionsApi.scala:135)
svcss_container |   at play.api.db.evolutions.DatabaseEvolutions.scripts(EvolutionsApi.scala:113)
svcss_container |   at play.api.db.evolutions.DatabaseEvolutions.scripts(EvolutionsApi.scala:128)
svcss_container |   at play.api.db.evolutions.DefaultEvolutionsApi.scripts(EvolutionsApi.scala:93)
svcss_container |   at play.api.db.evolutions.ApplicationEvolutions$$anonfun$play$api$db$evolutions$ApplicationEvolutions$$runEvolutions$1.apply$mcV$sp(ApplicationEvolutions.scala:53)
svcss_container |   at play.api.db.evolutions.ApplicationEvolutions.withLock(ApplicationEvolutions.scala:100)
svcss_container |   at play.api.db.evolutions.ApplicationEvolutions.play$api$db$evolutions$ApplicationEvolutions$$runEvolutions(ApplicationEvolutions.scala:49)
svcss_container |   at play.api.db.evolutions.ApplicationEvolutions$$anonfun$start$1.apply(ApplicationEvolutions.scala:42)
svcss_container |   at play.api.db.evolutions.ApplicationEvolutions$$anonfun$start$1.apply(ApplicationEvolutions.scala:42)
svcss_container |   at scala.collection.immutable.Stream.foreach(Stream.scala:594)
svcss_container |   at play.api.db.evolutions.ApplicationEvolutions.start(ApplicationEvolutions.scala:42)
svcss_container |   at play.api.db.evolutions.ApplicationEvolutions.<init>(ApplicationEvolutions.scala:151)
svcss_container |   at play.api.db.evolutions.ApplicationEvolutionsProvider.get$lzycompute(EvolutionsModule.scala:49)
svcss_container |   at play.api.db.evolutions.ApplicationEvolutionsProvider.get(EvolutionsModule.scala:49)
svcss_container |   at play.api.db.evolutions.ApplicationEvolutionsProvider.get(EvolutionsModule.scala:40)
svcss_container |   at com.google.inject.internal.ProviderInternalFactory.provision(ProviderInternalFactory.java:81)
svcss_container |   at com.google.inject.internal.BoundProviderFactory.provision(BoundProviderFactory.java:72)
svcss_container |   at com.google.inject.internal.ProviderInternalFactory.circularGet(ProviderInternalFactory.java:61)
svcss_container |   at com.google.inject.internal.BoundProviderFactory.get(BoundProviderFactory.java:62)
svcss_container |   at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46)
svcss_container |   at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1092)
svcss_container |   at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
svcss_container |   at com.google.inject.internal.SingletonScope$1.get(SingletonScope.java:194)
svcss_container |   at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:41)
svcss_container |   at com.google.inject.internal.InternalInjectorCreator$1.call(InternalInjectorCreator.java:205)
svcss_container |   at com.google.inject.internal.InternalInjectorCreator$1.call(InternalInjectorCreator.java:199)
svcss_container |   at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1085)
svcss_container |   at com.google.inject.internal.InternalInjectorCreator.loadEagerSingletons(InternalInjectorCreator.java:199)
svcss_container |   at com.google.inject.internal.InternalInjectorCreator.injectDynamically(InternalInjectorCreator.java:180)
svcss_container |   at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:110)
svcss_container |   at com.google.inject.Guice.createInjector(Guice.java:99)
svcss_container |   at com.google.inject.Guice.createInjector(Guice.java:84)
svcss_container |   at play.api.inject.guice.GuiceBuilder.injector(GuiceInjectorBuilder.scala:185)
svcss_container |   at play.api.inject.guice.GuiceApplicationBuilder.build(GuiceApplicationBuilder.scala:137)
svcss_container |   at play.api.inject.guice.GuiceApplicationLoader.load(GuiceApplicationLoader.scala:21)
svcss_container |   at play.core.server.ProdServerStart$.start(ProdServerStart.scala:51)
svcss_container |   at play.core.server.ProdServerStart$.main(ProdServerStart.scala:25)
svcss_container |   at play.core.server.ProdServerStart.main(ProdServerStart.scala)
svcss_container | Caused by: org.postgresql.util.PSQLException: Connection to 127.0.0.1:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
svcss_container |   at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:238)
svcss_container |   at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
svcss_container |   at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195)
svcss_container |   at org.postgresql.Driver.makeConnection(Driver.java:454)
svcss_container |   at org.postgresql.Driver.connect(Driver.java:256)
svcss_container |   at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:95)
svcss_container |   at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:101)
svcss_container |   at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:341)
svcss_container |   at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:193)
svcss_container |   at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:430)
svcss_container |   at com.zaxxer.hikari.pool.HikariPool.access$500(HikariPool.java:64)
svcss_container |   at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:570)
svcss_container |   at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:563)
svcss_container |   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
svcss_container |   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
svcss_container |   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
svcss_container |   at java.lang.Thread.run(Thread.java:748)
svcss_container | Caused by: java.net.ConnectException: Connection refused (Connection refused)
svcss_container |   at java.net.PlainSocketImpl.socketConnect(Native Method)
svcss_container |   at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
svcss_container |   at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
svcss_container |   at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
svcss_container |   at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
svcss_container |   at java.net.Socket.connect(Socket.java:589)
svcss_container |   at org.postgresql.core.PGStream.<init>(PGStream.java:69)
svcss_container |   at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:152)
svcss_container |   ... 16 more
svcss_container exited with code 255

这是它生成的错误日志。

我已经尝试了很多东西，比如检查我在项目中的 Slick 配置是否正确，但问题是 - 从 1.5 年开始，该项目在 docker 之外以开发和生产模式运行。这是完全正确的配置。

我在 docker .yml 或 Dockerfile 中可能做错了什么？

【问题讨论】：

您是否首先能够与另一个客户端连接？在尝试 JDBC 之前？
我从一开始就在项目中使用 JDBC，为什么它在 docker 内部表现不同？
无论如何尝试一个新的服务器，最好用客户端外部应用程序来验证访问
您需要将您的 JDBC url 更改为不使用127.0.0.1，而是需要使用主机名db
Caused by: org.postgresql.util.PSQLException: Connection to 127.0.0.1:5432 refused. 创建链接links: - db:postgreshost 后，您还必须将该信息传递给您的应用程序。在这种情况下，您需要将此信息作为 ENV 变量传递。

标签： postgresql scala docker playframework slick

【解决方案1】：

我觉得Jack Gore的思路是对的：更新JDBC url来使用服务主机地址？

services:
    polymer:
        ...
        build: 
            context: ./svcss
            args:
                POSTGRES_JDBC_HOST: db <-- this gets you the host address
                ...

    db:
        container_name: pg_container
        restart: always
        image: postgres
        ...

然后更新数据库 URL 以使用主机环境 arg，例如"jdbc:postgresql://${POSTGRES_JDBC_HOST}/mydb_db?createDatabaseIfNotExist=true&useSSL=false"

【讨论】：