（PostgreSQL）无法打开连接到数据库

我想安装一个Web应用程序（Keycloak）到服务器（OpenShift）。（PostgreSQL）无法打开连接到数据库

我使用oc命令（OpenShit Client）创建应用程序。

数据库正在运行，但我收到来自Web应用程序的错误，导致安装失败。

显然，它无法连接到数据库。

05:07:04,623 ERROR [org.jgroups.protocols.JDBC_PING] (MSC service thread 1-7) Could not open connection to database: org.postgresql.util.PSQLException: The connection attempt failed. 
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:233) 
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:64) 
    at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:144) 
    at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:29) 
    at org.postgresql.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:21) 
    at org.postgresql.jdbc3g.Jdbc3gConnection.<init>(Jdbc3gConnection.java:24) 
    at org.postgresql.Driver.makeConnection(Driver.java:410) 
    at org.postgresql.Driver.connect(Driver.java:280) 
    at java.sql.DriverManager.getConnection(DriverManager.java:664) 
    at java.sql.DriverManager.getConnection(DriverManager.java:247) 
    at org.jgroups.protocols.JDBC_PING.getConnection(JDBC_PING.java:336) 
    at org.jgroups.protocols.JDBC_PING.delete(JDBC_PING.java:379) 
    at org.jgroups.protocols.JDBC_PING.deleteSelf(JDBC_PING.java:395) 
    at org.jgroups.protocols.JDBC_PING.stop(JDBC_PING.java:144) 
    at org.jgroups.stack.ProtocolStack.stopStack(ProtocolStack.java:1015) 
    at org.jgroups.JChannel.stopStack(JChannel.java:1002) 
    at org.jgroups.JChannel.disconnect(JChannel.java:373) 
    at org.wildfly.clustering.jgroups.spi.service.ChannelConnectorBuilder.stop(ChannelConnectorBuilder.java:103) 
    at org.jboss.msc.service.ServiceControllerImpl$StopTask.stopService(ServiceControllerImpl.java:2056) 
    at org.jboss.msc.service.ServiceControllerImpl$StopTask.run(ServiceControllerImpl.java:2017) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at java.lang.Thread.run(Thread.java:745) 
Caused by: java.net.UnknownHostException: postgres 
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) 
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) 
    at java.net.Socket.connect(Socket.java:589) 
    at org.postgresql.core.PGStream.<init>(PGStream.java:61) 
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:109) 
    ... 22 more 
05:07:04,624 ERROR [org.jgroups.protocols.JDBC_PING] (MSC service thread 1-7) Failed to delete PingData in database 
05:07:04,663 INFO [org.jboss.as.server.deployment] (MSC service thread 1-3) WFLYSRV0028: Stopped deployment keycloak-server.war (runtime-name: keycloak-server.war) in 116ms 
05:07:04,671 INFO [org.jboss.as] (MSC service thread 1-5) WFLYSRV0050: Keycloak 3.0.0.Final (WildFly Core 2.0.10.Final) stopped in 116ms

任何反应表示赞赏。谢谢！

来源

2017-07-14 John Rey Tanquinco

'java.net.UnknownHostException：postgres'说这一切; DNS名称'postgres'未定义。你可以在'/ etc/hosts'文件中定义它，或者将它添加到你的DNS中（通过管理员添加它）。 –

因此，基本上，我的服务器上存在一个问题，其中db-name未解析为IP地址值。

我通过提供IP地址值来修复它。

来源

2017-09-28 06:47:30

（PostgreSQL）无法打开连接到数据库

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