Shulou(Shulou.com)06/01 Report--

This article mainly introduces how to solve the problem of slow start after Tomcat reconfiguration, which has a certain reference value, and interested friends can refer to it. I hope you can learn a lot after reading this article.

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

Attempt to restart tomcat

/ opt/tomcat/bin/shutdown.sh

The following error occurred

[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 February 20 2020 1:37:22 afternoon org.apache.catalina.startup.Catalina stopServer serious: Could not contact [localhost:8005]. Tomcat may not be running. February 20th 2020 1:37:22 afternoon org.apache.catalina.startup.Catalina stopServer serious: Catalina.stop: java.net.ConnectException: 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 (NativeMethod) 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)

It has been verified that the reason for this error is that Tomcat has not yet been started.

Then I tried to force the shutdown of tomcat

Ps-ef | grep tomcat checks the tomcat process number kill-9 + process number kills the process

Restart tomcat

/ opt/tomcat/bin/startup.sh

The tomcat page still cannot be loaded

Print tomcat run 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 catalina.out 20-Feb-2020 48 main 35.239 Information [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument:-Dcatalina.base=/opt/tomcat 20-Feb-2020 13 main 48 org.apache.catalina.startup.VersionLoggerListener.log Command line argument 35.239 Information [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument:-Dcatalina.home=/opt/tomcat 20-Feb-2020 13 main 48 Swiss 35.239 Information [main] org.apache.catalina.startup.VersionLoggerListener Log Command line argument:-Djava.io.tmpdir=/opt/tomcat/temp 20-Feb-2020 13 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 48 log Command line argument 35.239 Information [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 main 48 Freud 35.348 Information [main] org .apache.coyote.AbstractProtocol.init initialization protocol processor ["http-nio-8080"] 20-Feb-2020 13main 48VH 35.391 information [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read 20-Feb-2020 13Rd 48Rd 35.403 information [main] org.apache.catalina.startup.Catalina.load Initialization processed in 895 ms 20-Feb-2020 13Rose 4835.487 information [main] org. Apache.catalina.core.StandardService.startInternal Starting service [Catalina] 20-Feb-2020 13 20-Feb-2020 48 main 35.487 Information [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.51 20-Feb-2020 13 20-Feb-2020 48 main 35.524 Information [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory deploy web applications to the directory [/ opt/tomcat/webapps/docs]

It is found that the running log card is on the last line: localhost-startStop-1, and cannot proceed down.

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] # lsblacklisted.certs cacerts java.policy java.security nss.cfg policy [root@izbp1fmfc2pdjiw9u143xfz security] # vi java.security

By the way, a quick search in vi:

Enter "/ string" in command mode, such as "/ Section 3". If you look for the next one, just press "n".

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