解决Tomcat重新配置后启动慢

Jenkins+Tomcat服务器配置过程中，修改了tomcat配置文件；然后再访问服务器的tomcat页面发现根本加载不出来

企图重启tomcat
/opt/tomcat/bin/shutdown.sh
出现如下报错

[root@izbp1fmfc2pdjiw9u143xfz conf]# /opt/tomcat/bin/shutdown.sh
Using CATALINA_BASE:   /opt/tomcat
Using CATALINA_HOME:   /opt/tomcat
Using CATALINA_TMPDIR: /opt/tomcat/temp
Using JRE_HOME:        /usr/lib/jvm/java-1.8.0-openjdk
Using CLASSPATH:       /opt/tomcat/bin/bootstrap.jar:/opt/tomcat/bin/tomcat-juli.jar
二月 20, 2020 1:37:22 下午 org.apache.catalina.startup.Catalina stopServer
严重: Could not contact [localhost:8005]. Tomcat may not be running.
二月 20, 2020 1:37:22 下午 org.apache.catalina.startup.Catalina stopServer
严重: Catalina.stop: 
java.net.ConnectException: 拒绝连接 (Connection refused)
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:607)
	at java.net.Socket.connect(Socket.java:556)
	at java.net.Socket.(Socket.java:452)
	at java.net.Socket.(Socket.java:229)
	at org.apache.catalina.startup.Catalina.stopServer(Catalina.java:504)
	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.stopServer(Bootstrap.java:389)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:479)

经查证，出现这种报错的原因是Tomcat尚未启动完成；

接下来尝试了强制关闭tomcat

ps -ef | grep tomcat 查看tomcat进程号
kill -9 + 进程号 杀死进程

重新启动tomcat
/opt/tomcat/bin/startup.sh
tomcat页面依旧无法加载

打印tomcat运行日志

[root@izbp1fmfc2pdjiw9u143xfz conf]# cd /opt/tomcat
[root@izbp1fmfc2pdjiw9u143xfz tomcat]# ls
bin  BUILDING.txt  conf  CONTRIBUTING.md  lib  LICENSE  logs  NOTICE  README.md  RELEASE-NOTES  RUNNING.txt  temp  webapps  work
[root@izbp1fmfc2pdjiw9u143xfz tomcat]# cd logs
[root@izbp1fmfc2pdjiw9u143xfz logs]# ls
catalina.2020-02-20.log  host-manager.2020-02-20.log  localhost_access_log.2020-02-20.txt
catalina.out             localhost.2020-02-20.log     manager.2020-02-20.log
[root@izbp1fmfc2pdjiw9u143xfz logs]# tail  -f  catalina.out
20-Feb-2020 13:48:35.239 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.base=/opt/tomcat
20-Feb-2020 13:48:35.239 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.home=/opt/tomcat
20-Feb-2020 13:48:35.239 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.io.tmpdir=/opt/tomcat/temp
20-Feb-2020 13:48:35.239 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib]
20-Feb-2020 13:48:35.348 信息 [main] org.apache.coyote.AbstractProtocol.init 初始化协议处理器 ["http-nio-8080"]
20-Feb-2020 13:48:35.391 信息 [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
20-Feb-2020 13:48:35.403 信息 [main] org.apache.catalina.startup.Catalina.load Initialization processed in 895 ms
20-Feb-2020 13:48:35.487 信息 [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]
20-Feb-2020 13:48:35.487 信息 [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.51
20-Feb-2020 13:48:35.524 信息 [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory 把web 应用程序部署到目录 [/opt/tomcat/webapps/docs]

发现运行日志卡在最后一行：localhost-startStop-1，无法向下继续进行

解决方案：

将$ JAVA_HOME / jre / lib / security / java.security文件中的securerandom.source参数修改为文件：/ dev /./ urandom

[root@izbp1fmfc2pdjiw9u143xfz logs]# cd $JAVA_HOME/jre/lib/security
[root@izbp1fmfc2pdjiw9u143xfz security]# ls
blacklisted.certs  cacerts  java.policy  java.security  nss.cfg  policy
[root@izbp1fmfc2pdjiw9u143xfz security]# vi java.security

顺带一提，在vi中快速搜索的方法：

命令模式下输入“/字符串”，例如“/Section 3”。如果查找下一个，按“n”即可。