我在远程服务器上运行了一个 redis，另一个 Web 应用程序能够毫无问题地连接到它。我使用 redis 作为会话存储，当我尝试连接多个 tomcat 实例时，它会抛出下面提到的错误：-
redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
at redis.clients.util.Pool.getResource(Pool.java:22)
at com.radiadesign.catalina.session.RedisSessionManager.acquireConnection(RedisSessionManager.java:111)
at com.radiadesign.catalina.session.RedisSessionManager.loadSessionFromRedis(RedisSessionManager.java:391)
at com.radiadesign.catalina.session.RedisSessionManager.findSession(RedisSessionManager.java:325)
at org.apache.catalina.connector.Request.doGetSession(Request.java:2865)
at org.apache.catalina.connector.Request.getSession(Request.java:2316)
at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:898)
at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:229)
at org.springframework.web.context.request.ServletRequestAttributes.updateAccessedSessionAttributes(ServletRequestAttributes.java:221)
at org.springframework.web.context.request.AbstractRequestAttributes.requestCompleted(AbstractRequestAttributes.java:48)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:954)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.tcs.com.security.filter.SecurityInterceptor.doFilter(SecurityInterceptor.java:59)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at com.radiadesign.catalina.session.RedisSessionHandlerValve.invoke(RedisSessionHandlerValve.java:26)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.SocketTimeoutException: connect timed out
at redis.clients.jedis.Connection.connect(Connection.java:134)
at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:69)
at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1665)
at redis.clients.jedis.JedisPool$JedisFactory.makeObject(JedisPool.java:72)
at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1188)
at redis.clients.util.Pool.getResource(Pool.java:20)
... 33 more
Caused by: java.net.SocketTimeoutException: connect timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
at java.net.Socket.connect(Socket.java:579)
at redis.clients.jedis.Connection.connect(Connection.java:129)
... 38 more
我无法理解这个问题。我正在使用tomcat-redis-session-manager ，它适用于 Web 应用程序的一个实例，但是当我移动到多个实例时，我得到了上述错误。请建议如何相处？