解决Linux服务器tomact-8.0启动慢的问题

环境信息：

CentOS release 6.8

tomcat-8.0

JDK1.8

一、启动tomcat

#sh /root/tomcat-8.0/bin/startup.sh

#tailf /root/tomcat-8.0/logs/catalina.out

-Aug- ::31.661 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
-Aug- ::31.662 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in  ms
-Aug- ::31.685 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service Catalina
-Aug- ::31.685 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.0.
-Aug- ::31.695 INFO [localhost-startStop-] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /root/tomcat-8.0/webapps/ROOT
-Aug- ::36.184 INFO [localhost-startStop-] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
-Aug- ::37.895 INFO [localhost-startStop-] java.util.prefs.FileSystemPreferences$.run Created system preferences directory in java.home.
-Aug- ::37.897 INFO [localhost-startStop-] java.util.prefs.FileSystemPreferences$.run Created user preferences directory.
-Aug- ::37.907 WARNING [localhost-startStop-] java.util.prefs.FileSystemPreferences$.run Prefs file removed in background /root/.java/.userPrefs/prefs.xml
-Aug- ::37.908 WARNING [localhost-startStop-] java.util.prefs.FileSystemPreferences$.run Prefs file removed in background /root/jdk-1.8/jre/.systemPrefs/prefs.xml

... ...

等待tomcat启动的过程是煎熬的，足足5/6分钟，在不抱希望的情况下它居然又启动完成了......

有两种解决办法：

1）在Tomcat环境中解决

在catalina.sh中加入这么一行：

-Djava.security.egd=file:/dev/./urandom

例如：

JAVA_OPTS="-server -Xms2048m -Xmx4096m -XX:PermSize=256M -XX:MaxPermSize=512m -Djava.security.egd=file:/dev/./urandom"

2）在JVM环境中解决

修改$JAVA_PATH/jre/lib/security/java.security

securerandom.source=file:/dev/urandom

替换成

securerandom.source=file:/dev/./urandom