Centos7.x下Tomcat不能使用80端口的问题小结

阳光穿透心脏的1/2处 2023-07-08 09:00 6阅读 0赞

### 1、问题描述 ###

将Tomcat端口号更改为80不能启动，报错如下

25-Feb-2020 16:17:46.737 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-80"]
    25-Feb-2020 16:17:46.748 SEVERE [main] org.apache.catalina.core.StandardService.initInternal Failed to initialize connector [Connector[HTTP/1.1-80]]
            org.apache.catalina.LifecycleException: Protocol handler initialization failed
                    at org.apache.catalina.connector.Connector.initInternal(Connector.java:995)
                    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136)
                    at org.apache.catalina.core.StandardService.initInternal(StandardService.java:552)
                    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136)
                    at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:848)
                    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136)
                    at org.apache.catalina.startup.Catalina.load(Catalina.java:639)
                    at org.apache.catalina.startup.Catalina.load(Catalina.java:662)
                    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
                    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
                    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
                    at java.lang.reflect.Method.invoke(Method.java:498)
                    at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:303)
                    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:473)
            Caused by: java.net.SocketException: Permission denied
                    at sun.nio.ch.Net.bind0(Native Method)
                    at sun.nio.ch.Net.bind(Net.java:433)
                    at sun.nio.ch.Net.bind(Net.java:425)
                    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
                    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
                    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:221)
                    at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:1118)
                    at org.apache.tomcat.util.net.AbstractJsseEndpoint.init(AbstractJsseEndpoint.java:223)
                    at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:581)
                    at org.apache.coyote.http11.AbstractHttp11Protocol.init(AbstractHttp11Protocol.java:70)
                    at org.apache.catalina.connector.Connector.initInternal(Connector.java:993)
                    ... 13 more
    25-Feb-2020 16:17:46.750 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8009"]

将端口号改为默认的8080后，可以正常访问。

### 2、原因 ###

1024以下的端口只能由root用户使用，普通权限的用户没有权限。恰好80端口号小于1024，而8080端口号大于1024。  
再检查一下当前用户，恰好非root用户。

原因找到。

### 3、解决办法 ###

推荐解决方案：使用sudo命令

[appadmin@app apache-tomcat-8.5.50]$ sudo bin/startup.sh 
    [sudo] password for appadmin: 
    Using CATALINA_BASE:   /tpdata/app/apache-tomcat-8.5.50
    Using CATALINA_HOME:   /tpdata/app/apache-tomcat-8.5.50
    Using CATALINA_TMPDIR: /tpdata/app/apache-tomcat-8.5.50/temp
    Using JRE_HOME:        /
    Using CLASSPATH:       /tpdata/app/apache-tomcat-8.5.50/bin/bootstrap.jar:/tpdata/app/apache-tomcat-8.5.50/bin/tomcat-juli.jar
    Tomcat started.
    [appadmin@app apache-tomcat-8.5.50]$ netstat -tlnp|grep 80
    (No info could be read for "-p": geteuid()=1001 but you should be root.)
    tcp6       0      0 :::8009                 :::*                    LISTEN      -                   
    tcp6       0      0 :::80                   :::*                    LISTEN      -                   
    tcp6       0      0 127.0.0.1:8005          :::*                    LISTEN      -                   
    [appadmin@app apache-tomcat-8.5.50]$

80端口已经正常启动了。