嵌入式Tomcat在AWS Elastic Beanstalk上无法监听端口80

Question

我正在启动一个带有嵌入式Tomcat的Spring Boot .jar到Elastic Beanstalk（Java）实例。在配置文件中设置了server.port=80，但是EB不允许Tomcat绑定到端口80。是什么阻止了Tomcat监听端口80，我该如何修复它？以下是日志的相关部分：

Caused by: org.apache.catalina.LifecycleException: service.getName(): "Tomcat";  Protocol handler start failed
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1000) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
    ... 21 common frames omitted
Caused by: java.net.SocketException: Permission denied
    at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_121]
    at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_121]
    at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_121]
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_121]
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_121]
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:210) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
    at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:980) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
    at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:573) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:993) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
    ... 22 common frames omitted

2017-02-09 09:05:28.126  INFO 2451 --- [           main] o.apache.catalina.core.StandardService   : Stopping service Tomcat
2017-02-09 09:05:28.156  INFO 2451 --- [           main] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-02-09 09:05:28.167 ERROR 2451 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

The Tomcat connector configured to listen on port 80 failed to start. The port may already be in use or the connector may be misconfigured.

Action:

Verify the connector's configuration, identify and stop any process that's listening on port 80, or configure this application to listen on another port.

2017-02-09 09:05:28.175  INFO 2451 --- [           main] ationConfigEmbeddedWebApplicationContext : Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@5387f9e0: startup date [Thu Feb 09 09:05:19 UTC 2017]; root of context hierarchy
2017-02-09 09:05:28.178  INFO 2451 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown

- AppCrafter

---

由于ec2-user无法绑定到端口80，你可以使用sudo运行你的应用程序。显然，出于安全考虑，这并不是一个好的实践。为什么想要监听端口80？Elastic Beanstalk默认会代理到端口8080。 - Strelok

我之前在使用Node.js时遇到了同样的问题。在Beanstalk中，它使用nginx作为代理服务器将HTTP请求传递给Node.js。 - Veck Hsiao

Answer 1

我假设楼主已经解决了这个问题，但是我会在这里发布我的解决方案，以帮助那些遇到相同问题的新手。

我通过将环境属性SERVER_PORT设置为5000（您可以在“配置”>“软件配置”中设置）来使我的Spring Boot应用程序可从AWS Elastic Beanstalk的端口80访问。

想法来自于这里。

- AbstractVoid