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Tomcat7 在 Ubuntu 14.04 x64 [Digitalocean] 上启动太晚

本文介绍了Tomcat7 在 Ubuntu 14.04 x64 [Digitalocean] 上启动太晚的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在使用 digitalocean 并尝试在 ubuntu 上安装和启动 tomcat，但不幸的是我无法做到.(创建新的液滴并尝试了 10 次)

i am using digitalocean and trying to install and start tomcat on ubuntu but unfortunately i can not do it. (created new droplets and tried 10 times)

1GB Ram 30GB SSD Disk Amsterdam 2 Ubuntu 14.04 x64

当我启动 tomcat 时，它说Tomcat 已启动".但我无法从浏览器访问页面.和 ./shutdown.sh 返回错误.

When i start tomcat, it says "Tomcat started". But i can not access page from browser. and ./shutdown.sh returns error.

可能是什么问题?

我现在注意到了一些事情.在我写这个问题时，显示了 tomcat 页面.显示页面花了 28 分钟

catalina.out 说:信息:使用 [SHA1PRNG] 为会话 ID 生成创建 SecureRandom 实例花了 [1,718,769] 毫秒.

catalina.out says: INFO: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [1,718,769] milliseconds.

以下是我的安装步骤(这些步骤适用于不同的 vps，但不适用于 digitalocean droplets):

Here are my installation steps (These steps works on different vps but doesn't work on digitalocean droplets):

安装 oracle jdk

Install oracle jdk

 sudo apt-get install python-software-properties
 sudo add-apt-repository ppa:webupd8team/java
 sudo apt-get update
 sudo apt-get install oracle-java7-installer
 sudo apt-get install oracle-java7-set-default
      java -version
      java version "1.7.0_72"
      Java(TM) SE Runtime Environment (build 1.7.0_72-b14)
      Java HotSpot(TM) 64-Bit Server VM (build 24.72-b04, mixed mode)

设置java路径

      sudo nano /etc/environment
      JAVA_HOME="/usr/lib/jvm/java-7-oracle"
      source /etc/environment
      wget http://ftp.itu.edu.tr/Mirror/Apache/tomcat/tomcat-7/v7.0.56/bin/apache-tomcat-7.0.56.tar.gz
      tar xvzf apache-tomcat-7.0.56.tar.gz
      mv apache-tomcat-7.0.56/ apache-tomcat-7.0.56-server-1/

启动Tomcat

        ./startup.sh
            Using CATALINA_BASE:   /usr/local/apache-tomcat-7.0.56-server-1
            Using CATALINA_HOME:   /usr/local/apache-tomcat-7.0.56-server-1
            Using CATALINA_TMPDIR: /usr/local/apache-tomcat-7.0.56-server-1/temp
            Using JRE_HOME:        /usr/lib/jvm/java-7-oracle/jre
            Using CLASSPATH:       /usr/local/apache-tomcat-7.0.56-server-1/bin/bootstrap.jar:/usr/local/apache-tomcat-7.0.56-server-1/bin/tomcat-juli.jar
            Tomcat started.

结帐端口 8080 

        netstat -ln
            tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN
            tcp6       0      0 :::8009                 :::*                    LISTEN
            tcp6       0      0 :::8080                 :::*                    LISTEN
            tcp6       0      0 :::22                   :::*                    LISTEN

结帐流程

            ps -ef | grep tomcat
            root      2825     1  1 14:23 pts/0    00:00:03 /usr/lib/jvm/java-7-oracle/jre/bin/java -Djava.util.logging.config.file=/usr/local/apache-tomcat-7.0.56-server-1/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/local/apache-tomcat-7.0.56-server-1/endorsed -classpath /usr/local/apache-tomcat-7.0.56-server-1/bin/bootstrap.jar:/usr/local/apache-tomcat-7.0.56-server-1/bin/tomcat-juli.jar -Dcatalina.base=/usr/local/apache-tomcat-7.0.56-server-1 -Dcatalina.home=/usr/local/apache-tomcat-7.0.56-server-1 -Djava.io.tmpdir=/usr/local/apache-tomcat-7.0.56-server-1/temp org.apache.catalina.startup.Bootstrap start

在 8080 端口打开网站 http://5.101.107.56:8080/ 页面正在等待... [28 分钟或更长时间后显示内容]

Open web site at port 8080 http://5.101.107.56:8080/ Page is waiting... [content is displayed after 28 minute or more]

如果内容尚未显示(在tomcat正常启动之前)，请尝试关闭tomcat.

Try to shutdown tomcat if content is not displayed yet (before tomcat starts properly).

      ./shutdown.sh
            SEVERE: Could not contact localhost:8005. Tomcat may not be running.
            Oct 17, 2014 2:40:29 PM org.apache.catalina.startup.Catalina stopServer
            SEVERE: Catalina.stop:
                java.net.ConnectException: Connection refused
                at java.net.PlainSocketImpl.socketConnect(Native Method)
                at java.net.AbstractPlainSoc

结帐日志

      catalina.out
            Oct 17, 2014 2:31:47 PM org.apache.coyote.AbstractProtocol init
            INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
            Oct 17, 2014 2:31:47 PM org.apache.catalina.startup.Catalina load
            INFO: Initialization processed in 1492 ms
            Oct 17, 2014 2:31:47 PM org.apache.catalina.core.StandardService startInternal
            INFO: Starting service Catalina
            Oct 17, 2014 2:31:47 PM org.apache.catalina.core.StandardEngine startInternal
            INFO: Starting Servlet Engine: Apache Tomcat/7.0.56
            Oct 17, 2014 2:31:47 PM org.apache.catalina.startup.HostConfig deployDirectory
            INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.56-server-1/webapps/host-manager

我也安装了nginx并导航到http://5.XXX.XXX.XX/ nginx欢迎页面立即打开

I also installed nginx and navigate to http://5.XXX.XXX.XX/ nginx welcome page is opened immediately

当我在浏览器中看到页面时，我检查了 catalina.out，它说:

I checked catalina.out when i see the page in browser, it says: 

    Oct 17, 2014 2:31:47 PM org.apache.catalina.startup.HostConfig deployDirectory
    INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.56-server-1/webapps/host-manager
    Oct 17, 2014 3:00:27 PM org.apache.catalina.util.SessionIdGenerator createSecureRandom
    INFO: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took **[1,718,769] milliseconds.**

内存:

               total       used       free     shared    buffers     cached
  Mem:       1017912     849512     168400        332      18780     688468

推荐答案

用 securerandom.source=file:/dev/./替换 securerandom.source=file:/dev/urandom$JAVA_PATH/jre/lib/security/java.security 中的 urandom 解决了我的问题.

Replacing securerandom.source=file:/dev/urandom with securerandom.source=file:/dev/./urandom in $JAVA_PATH/jre/lib/security/java.security has solved my problem.

即使指定了 file:/dev/urandom，JRE 仍将使用 /dev/random 进行 SHA1PRNG(请参阅错误 JDK-4705093):

Even when file:/dev/urandom is specified, JRE will still use /dev/random for SHA1PRNG (see bug JDK-4705093):

在 SHA1PRNG 中，有一个 SeedGenerator 可以做各种事情取决于配置.

  1. 如果 java.security.egd 或 securerandom.source 指向file:/dev/random"或file:/dev/urandom"，我们将使用NativeSeedGenerator，它调用 super() 调用SeedGenerator.URLSeedGenerator(/dev/random).(内部的嵌套类SeedGenerator.)这个错误中唯一改变的是urandom 也会触发使用此代码路径.

  1. If java.security.egd or securerandom.source point to "file:/dev/random" or "file:/dev/urandom", we will useNativeSeedGenerator, which calls super() which callsSeedGenerator.URLSeedGenerator(/dev/random). (A nested class withinSeedGenerator.) The only things that changed in this bug was thaturandom will also trigger use of this code path.

如果这些属性指向另一个存在的 URL，我们将初始化 SeedGenerator.URLSeedGenerator(url).这就是为什么file:///dev/urandom"、file:/./dev/random"等都可以使用.

If those properties point to another URL that exists, we'll initialize SeedGenerator.URLSeedGenerator(url). This is why"file:///dev/urandom", "file:/./dev/random", etc. will work.

来自 维基百科/dev/random:

在这个实现中，生成器保持对数字的估计熵池中的噪声位.从这个熵池随机数字被创建.读取时，/dev/random 设备只会在估计的噪声比特数内返回随机字节熵池./dev/random 应该适合需要的用途非常高质量的随机性，例如一次性填充或密钥生成.

当熵池为空时，从/dev/random读取会阻塞直到收集到额外的环境噪音. 目的是作为加密安全的伪随机数生成器，以尽可能大的熵提供输出.这是建议用于生成高价值或长期的加密密钥保护.

When the entropy pool is empty, reads from /dev/random will blockuntil additional environmental noise is gathered. The intent is toserve as a cryptographically secure pseudorandom number generator,delivering output with entropy as large as possible. This is suggestedfor use in generating cryptographic keys for high-value or long-termprotection.

环境噪音?

随机数生成器从设备收集环境噪声 驱动程序和其他来源进入熵池.发电机也保持对熵池中噪声位数的估计.从这个熵池中创建随机数.

这意味着在实践中，有可能阻止 tomcat 一段未知的时间.

这篇关于Tomcat7 在 Ubuntu 14.04 x64 [Digitalocean] 上启动太晚的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

08-06 08:43
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