Question

我的cloudformation堆栈已成功部署。我正在尝试在EC2上部署一个clojure响铃应用程序。

当我在my-app.us-west-1.elb.amazonaws.com访问我的弹性负载平衡端点时，我得到Failed to load resource: the server responded with a status of 503 (Service Unavailable: Back-end server is at capacity)

我确认tomcat是通过sshing进入ec2并运行ps -afx

来运行的

那么这可能是什么问题？

更新：好的，所以对localhost做一个curl请求：8080返回HTTP 500

SEVERE: Servlet.service() for servlet [clj-west.system/servlet-handler servlet] in context with path [] threw exception
java.lang.NullPointerException: Handler returned nil
        at ring.util.servlet$make_service_method$fn__52.invoke(servlet.clj:127)
        at clj_west.servlet$_service.invoke(servlet.clj:1)
        at clj_west.servlet.service(Unknown Source)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)

Answer 1

基于评论的讨论。通过更新ELB上的健康检查来解决该问题。

AWS ELB：无法加载资源：服务器响应状态为503（服务不可用：后端服务器处于容量状态）

1 个答案: