array(2) { ["docs"]=> array(10) { [0]=> array(10) { ["id"]=> string(3) "428" ["text"]=> string(77) "Visual Studio 2017 单独启动MSDN帮助（Microsoft Help Viewer）的方法" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具，而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(8) "DonetRen" ["tagsname"]=> string(55) "Visual Studio 2017|MSDN帮助|C#程序|.NET|Help Viewer" ["tagsid"]=> string(23) "[401,402,403,"300",404]" ["catesname"]=> string(0) "" ["catesid"]=> string(2) "[]" ["createtime"]=> string(10) "1511400964" ["_id"]=> string(3) "428" } [1]=> array(10) { ["id"]=> string(3) "427" ["text"]=> string(42) "npm -v；报错 cannot find module "wrapp"" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具，而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(4) "zzty" ["tagsname"]=> string(50) "node.js|npm|cannot find module "wrapp“|node" ["tagsid"]=> string(19) "[398,"239",399,400]" ["catesname"]=> string(0) "" ["catesid"]=> string(2) "[]" ["createtime"]=> string(10) "1511400760" ["_id"]=> string(3) "427" } [2]=> array(10) { ["id"]=> string(3) "426" ["text"]=> string(54) "说说css中pt、px、em、rem都扮演了什么角色" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具，而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(12) "zhengqiaoyin" ["tagsname"]=> string(0) "" ["tagsid"]=> string(2) "[]" ["catesname"]=> string(0) "" ["catesid"]=> string(2) "[]" ["createtime"]=> string(10) "1511400640" ["_id"]=> string(3) "426" } [3]=> array(10) { ["id"]=> string(3) "425" ["text"]=> string(83) "深入学习JS执行--创建执行上下文（变量对象，作用域链，this）" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具，而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(7) "Ry-yuan" ["tagsname"]=> string(33) "Javascript|Javascript执行过程" ["tagsid"]=> string(13) "["169","191"]" ["catesname"]=> string(0) "" ["catesid"]=> string(2) "[]" ["createtime"]=> string(10) "1511399901" ["_id"]=> string(3) "425" } [4]=> array(10) { ["id"]=> string(3) "424" ["text"]=> string(30) "C# 排序技术研究与对比" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具，而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(9) "vveiliang" ["tagsname"]=> string(0) "" ["tagsid"]=> string(2) "[]" ["catesname"]=> string(8) ".Net Dev" ["catesid"]=> string(5) "[199]" ["createtime"]=> string(10) "1511399150" ["_id"]=> string(3) "424" } [5]=> array(10) { ["id"]=> string(3) "423" ["text"]=> string(72) "【算法】小白的算法笔记：快速排序算法的编码和优化" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具，而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(9) "penghuwan" ["tagsname"]=> string(6) "算法" ["tagsid"]=> string(7) "["344"]" ["catesname"]=> string(0) "" ["catesid"]=> string(2) "[]" ["createtime"]=> string(10) "1511398109" ["_id"]=> string(3) "423" } [6]=> array(10) { ["id"]=> string(3) "422" ["text"]=> string(64) "JavaScript数据可视化编程学习（二）Flotr2，雷达图" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具，而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(7) "chengxs" ["tagsname"]=> string(28) "数据可视化|前端学习" ["tagsid"]=> string(9) "[396,397]" ["catesname"]=> string(18) "前端基本知识" ["catesid"]=> string(5) "[198]" ["createtime"]=> string(10) "1511397800" ["_id"]=> string(3) "422" } [7]=> array(10) { ["id"]=> string(3) "421" ["text"]=> string(36) "C#表达式目录树（Expression）" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具，而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(4) "wwym" ["tagsname"]=> string(0) "" ["tagsid"]=> string(2) "[]" ["catesname"]=> string(4) ".NET" ["catesid"]=> string(7) "["119"]" ["createtime"]=> string(10) "1511397474" ["_id"]=> string(3) "421" } [8]=> array(10) { ["id"]=> string(3) "420" ["text"]=> string(47) "数据结构 队列_队列实例：事件处理" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具，而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(7) "idreamo" ["tagsname"]=> string(40) "C语言|数据结构|队列|事件处理" ["tagsid"]=> string(23) "["246","247","248",395]" ["catesname"]=> string(12) "数据结构" ["catesid"]=> string(7) "["133"]" ["createtime"]=> string(10) "1511397279" ["_id"]=> string(3) "420" } [9]=> array(10) { ["id"]=> string(3) "419" ["text"]=> string(47) "久等了,博客园官方Android客户端发布" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具，而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(3) "cmt" ["tagsname"]=> string(0) "" ["tagsid"]=> string(2) "[]" ["catesname"]=> string(0) "" ["catesid"]=> string(2) "[]" ["createtime"]=> string(10) "1511396549" ["_id"]=> string(3) "419" } } ["count"]=> int(200) } 222 Centos7下启动tomcat很慢原因及解决方案 - 爱码网

Centos7下启动tomcat很慢原因及解决方案

  • 阿里云  >  教程中心   >  linux教程  >  Centos7下启动tomcat很慢原因及解决方案  
  • Centos7下启动tomcat很慢原因及解决方案

  • 发布时间：2018-01-19 来源：网络 上传者：用户

    关键字: 解决方案 原因 centos7 启动 Tomcat

    发表文章
  • 摘要：现象在一次CentOS7系统中安装Tomcat,启动过程很慢,需要几分钟,经过查看日志,发现耗时在这里:是session引起的随机数问题导致的。Tocmat的SessionID是通过SHA1算法计算得到的,计算SessionID的时候必须有一个**。为了提高安全性Tomcat在启动的时候回通过随机生成一个**。INFO:StartingserviceCatalinaSep30,20179:29:55AMorg.apache.catalina.core.StandardEngi
  • 现象

    在一次CentOS 7系统中安装Tomcat,启动过程很慢,需要几分钟,经过查看日志,发现耗时在这里:是session引起的随机数问题导致的。Tocmat的Session ID是通过SHA1算法计算得到的,计算Session ID的时候必须有一个**。为了提高安全性Tomcat在启动的时候回通过随机生成一个**。

     

    INFO: Starting service CatalinaSep 30, 2017 9:29:55 AM org.apache.catalina.core.StandardEngine startInternalINFO: Starting Servlet Engine: Apache Tomcat/7.0.81Sep 30, 2017 9:29:55 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deploying web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/ROOTSep 30, 2017 9:31:03 AM org.apache.catalina.util.SessionIdGeneratorBase createSecureRandom WARNING: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [67,190] milliseconds.Sep 30, 2017 9:31:03 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deployment of web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/ROOT has finished in 67,666 msSep 30, 2017 9:31:03 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deploying web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/docsSep 30, 2017 9:31:03 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deployment of web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/docs has finished in 61 msSep 30, 2017 9:31:03 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deploying web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/examplesSep 30, 2017 9:31:03 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deployment of web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/examples has finished in 334 msSep 30, 2017 9:31:03 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deploying web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/host-managerSep 30, 2017 9:31:03 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deployment of web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/host-manager has finished in 63 msSep 30, 2017 9:31:03 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deploying web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/managerSep 30, 2017 9:31:03 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deployment of web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/manager has finished in 47 msSep 30, 2017 9:31:03 AM org.apache.coyote.AbstractProtocol startINFO: Starting ProtocolHandler ["http-bio-8080"]Sep 30, 2017 9:31:03 AM org.apache.coyote.AbstractProtocol startINFO: Starting ProtocolHandler ["ajp-bio-8009"]Sep 30, 2017 9:31:03 AM org.apache.catalina.startup.Catalina startINFO: Server startup in 68241 ms

     

    图片看的更清楚:

     

    Centos7下启动tomcat很慢原因及解决方案

     

     

     

    分析结果

     

    主要原因是生成随机数的时候卡住了,导致tomcat启动不了。

     

     

    解决方案 vim $JAVA_HOME/jre/lib/security/java.securitysecurerandom.source=file:/dev/urandom改为securerandom.source=file:/dev/./urandom
    结果

     

    重启tomcat,启动时间由68241ms—>956ms

     

    INFO: Starting Servlet Engine: Apache Tomcat/7.0.81Sep 30, 2017 9:47:22 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deploying web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/ROOTSep 30, 2017 9:47:23 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deployment of web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/ROOT has finished in 460 msSep 30, 2017 9:47:23 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deploying web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/docsSep 30, 2017 9:47:23 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deployment of web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/docs has finished in 48 msSep 30, 2017 9:47:23 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deploying web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/examplesSep 30, 2017 9:47:23 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deployment of web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/examples has finished in 292 msSep 30, 2017 9:47:23 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deploying web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/host-managerSep 30, 2017 9:47:23 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deployment of web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/host-manager has finished in 50 msSep 30, 2017 9:47:23 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deploying web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/managerSep 30, 2017 9:47:23 AM org.apache.catalina.startup.HostConfig deployDirectoryINFO: Deployment of web application directory /usr/tomcat/apache-tomcat-7.0.81/webapps/manager has finished in 46 msSep 30, 2017 9:47:23 AM org.apache.coyote.AbstractProtocol startINFO: Starting ProtocolHandler ["http-bio-8080"]Sep 30, 2017 9:47:23 AM org.apache.coyote.AbstractProtocol startINFO: Starting ProtocolHandler ["ajp-bio-8009"]Sep 30, 2017 9:47:23 AM org.apache.catalina.startup.Catalina startINFO: Server startup in 956 ms

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