Quickly solve the problem of slow startup after Tomcat reconfiguration

During the configuration of Jenkins+Tomcat server, the tomcat configuration file was modified; then when I accessed the tomcat page of the server, I found that it could not be loaded at all

Attempt to restart tomcat

/opt/tomcat/bin/shutdown.sh

The following error occurs

[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.<init>(Socket.java:452) at java.net.Socket.<init>(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)

After verification, the reason for this error is that Tomcat has not yet been started;

Next I tried to force shut down Tomcat

ps -ef | grep tomcat View the tomcat process number kill -9 + process number to kill the process

Restart tomcat

/opt/tomcat/bin/startup.sh

Tomcat page still cannot be loaded

Print tomcat running log

[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]

The running log is found to be stuck at the last line: localhost-startStop-1 , and cannot continue downward

Solution:

Modify the securerandom.source parameter in the $ JAVA_HOME / jre / lib / security / java.security file to the file: /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

By the way, here is a quick way to search in vi:

In command mode, enter “/string”, for example, “/Section 3”. To search for the next one, just press "n".

Summarize

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