WAS集群系列（2）：数据库连接低级错误网络连接问题
环境 项目点 指标 WAS版本 7.0 应用服务器操作系统 Windows 2008 应用服务器系统位数 64bit 数据库服务器操作系统 CentOS 5.6 数据库版本 Oracle 11.0.2.1 今天搭建WAS集群后，发布应用程序包及启动均成功，但在测试数据库连接时提示，不成功，建议查看KVM日
环境
|
项目点 |
指标 |
|
WAS版本 |
7.0 |
|
应用服务器操作系统 |
Windows 2008 |
|
应用服务器系统位数 |
64bit |
|
数据库服务器操作系统 |
CentOS 5.6 |
|
数据库版本 |
Oracle 11.0.2.1 |
今天搭建WAS集群后，发布应用程序包及启动均成功，但在测试数据库连接时提示，不成功，建议查看KVM日志。
于是到日志路径下查看相关日志（此处参考为D:\IBM\WebSphere\AppServer\profiles\AppSrv01\logs\server1\SystemOut.log），信息如下：
[14-9-3 16:34:08:609 CST] 0000001d DataSourceCon E DSRA8040I: 无法连接到 DataSource。遇到 ""：java.sql.SQLException: The Network Adapter could not establish the connectionDSRA0010E: SQL 状态：61000，错误码：20。 at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:412) at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:531) at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:221) at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:503) at oracle.jdbc.pool.OracleDataSource.getPhysicalConnection(OracleDataSource.java:280) at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:207) at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPhysicalConnection(OracleConnectionPoolDataSource.java:139) at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPooledConnection(OracleConnectionPoolDataSource.java:88) at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPooledConnection(OracleConnectionPoolDataSource.java:70) at com.ibm.ws.rsadapter.DSConfigurationHelper$2.run(DSConfigurationHelper.java:1704) at com.ibm.ws.security.auth.ContextManagerImpl.runAs(ContextManagerImpl.java:5263) at com.ibm.ws.security.auth.ContextManagerImpl.runAsSystem(ContextManagerImpl.java:5441) at com.ibm.ws.security.core.SecurityContext.runAsSystem(SecurityContext.java:255) at com.ibm.ws.rsadapter.DSConfigurationHelper$3.run(DSConfigurationHelper.java:1720) at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:118) at com.ibm.ws.rsadapter.DSConfigurationHelper.getPooledConnection(DSConfigurationHelper.java:1732) at com.ibm.ws.rsadapter.DSConfigurationHelper.getPooledConnection(DSConfigurationHelper.java:1627) at com.ibm.ws.rsadapter.DSConfigurationHelper.getConnectionFromDSOrPooledDS(DSConfigurationHelper.java:3370) at com.ibm.ws.rsadapter.DSConfigurationHelper.getConnectionFromDSOrPooledDS(DSConfigurationHelper.java:3245) at com.ibm.ws.rsadapter.DSConfigurationHelper.testConnectionForGUI(DSConfigurationHelper.java:4105) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:600) at com.ibm.ws.management.DataSourceConfigHelperMBean.testConnectionToDataSource2(DataSourceConfigHelperMBean.java:556) at com.ibm.ws.management.DataSourceConfigHelperMBean.testConnection(DataSourceConfigHelperMBean.java:484) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:600) at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:37) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:600) at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:244) at javax.management.modelmbean.RequiredModelMBean.invokeMethod(RequiredModelMBean.java:1074) at javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:955) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:761) at com.ibm.ws.management.AdminServiceImpl$1.run(AdminServiceImpl.java:1331) at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:118) at com.ibm.ws.management.AdminServiceImpl.invoke(AdminServiceImpl.java:1224) at com.ibm.ws.management.connector.AdminServiceDelegator.invoke(AdminServiceDelegator.java:181) at com.ibm.ws.management.connector.ipc.CallRouter.route(CallRouter.java:242) at com.ibm.ws.management.connector.ipc.IPCConnectorInboundLink.doWork(IPCConnectorInboundLink.java:353) at com.ibm.ws.management.connector.ipc.IPCConnectorInboundLink$IPCConnectorReadCallback.complete(IPCConnectorInboundLink.java:595) at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165) at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217) at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161) at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138) at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204) at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775) at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1613) Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:359) at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:422) at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:672) at oracle.net.ns.NSProtocol.connect(NSProtocol.java:237) at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1042) at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:301) ... 55 more Caused by: java.net.ConnectException: Connection refused: connect at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:370) at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:232) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:219) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) at java.net.Socket.connect(Socket.java:528) at oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:141) at oracle.net.nt.ConnOption.connect(ConnOption.java:123) at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:337) ... 60 more 。 [14-9-2 16:34:27:921 CST] 0000005f NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:35:27:921 CST] 00000060 NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:36:27:921 CST] 00000061 NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:37:27:937 CST] 00000062 NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:38:27:937 CST] 00000063 NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:39:27:937 CST] 00000064 NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:40:27:921 CST] 00000065 NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:41:27:953 CST] 00000066 NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:42:27:921 CST] 00000067 NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:43:27:937 CST] 00000068 NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:44:27:937 CST] 00000069 NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:45:27:921 CST] 0000006a NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:46:27:937 CST] 0000006b NodeSyncTask A ADMS0003I: 配置同步成功完成。 [14-9-2 16:47:27:921 CST] 0000006c NodeSyncTask A ADMS0003I: 配置同步成功完成。
虽然这么冗长的日志信息，但问题锁定到第一行，“The Network Adapter could not establish the connectionDSRA0010E”，这个问题按理说是常规问题，但由于进行了一个下午的各种配置设置，脑袋有些晕了。看到这个问题后，整个思路都跑偏了。现在将其记录，引以为戒。
错误的思考：
1、看到“The Network Adapter”，肯定是网络问题，想到是不是WAS集群两台服务器网卡问题，进行对数据库服务器及集群服务器互相ping通测试，ping通状态正常；
2、查看WAS数据源配置信息，开始检查各节点服务，重启各节点服务及HTTP服务等等，有些碰运气的胡乱尝试了，这个结果就是我的思路被自己彻底弄乱了；
3、于是接下来，做了更可笑的事，查看WAS集群下配置信息，怀疑数据源连接问题，对数据源格式由原来的“jdbc:oracle:thin:@10.53.105.64:1521:hyl”改为“jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 10.53.105.64)(PORT =1521)))(CONNECT_DATA = (SERVICE_NAME =hyl)))”。这里想的是因为网络连接问题，怀疑可能是集群服务器无法完成连接，可能是解析出问题了，于是修改成完整格式。测试数据库连接，依旧不成功。这里问题就出现了，忽略了简单的问题，把问题越想越复杂化了。
更正后的思考：
其实由上面第一点开始，就有些跑偏了，ping通测试后，应该最先想到的就是去看下数据库监听起来没有。而我完全忽略了这点，原因很简单，因为这台数据库服务器之前连接着单节点的WAS，连接测试没有问题，也就笃定了监听没有问题。就这么小的地方，自己有没有亲自去验证，而引发问题的复杂化。当发现数据库监听没有起来时才意识到，问题出在了这里，原来是当停止单实例WAS时，数据库服务器被重启过，而且该服务器上的监听并没有设置自动启动。说来是如此的简单。于是我启动监听，将之前改动过的测试恢复回刚刚配置完成后的常规设置状态，WAS数据源测试连接，结果两节点测试连接通过。
小结：
1、处理问题时，正确的思路比胡乱的尝试重要，只有方向对了才会“药到病除”，否则可能会“火上浇油”，把自己思路都弄乱了。
2、在技术上，记住了“The Network Adapter couldnot establish…”出现时，切记ping测试后，检查监听状态，确认后再做进一步分析。
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