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翻译完成:20150202 How to Bind Apache Tomcat to IPv4 in Centos or Redhat
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翻译中 ictlyh
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How to Bind Apache Tomcat to IPv4 in Centos / Redhat
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================================================================================
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Hi all, today we'll learn how to bind tomcat to ipv4 in CentOS 7 Linux Distribution.
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**Apache Tomcat** is an open source web server and servlet container developed by the [Apache Software Foundation][1]. It implements the Java Servlet, JavaServer Pages (JSP), Java Unified Expression Language and Java WebSocket specifications from Sun Microsystems and provides a web server environment for Java code to run in.
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Binding Tomcat to IPv4 is necessary if we have our server not working due to the default binding of our tomcat server to IPv6. As we know IPv6 is the modern way of assigning IP address to a device and is not in complete practice these days but may come into practice in soon future. So, currently we don't need to switch our tomcat server to IPv6 due to no use and we should bind it to IPv4.
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Before thinking to bind to IPv4, we should make sure that we've got tomcat installed in our CentOS 7. Here's is a quick tutorial on [how to install tomcat 8 in CentOS 7.0 Server][2].
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### 1. Switching to user tomcat ###
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First of all, we'll gonna switch user to **tomcat** user. We can do that by running **su - tomcat** in a shell or terminal.
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# su - tomcat
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### 2. Finding Catalina.sh ###
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Now, we'll First Go to bin directory inside the directory of Apache Tomcat installation which is usually under **/usr/share/apache-tomcat-8.0.x/bin/** where x is sub version of the Apache Tomcat Release. In my case, its **/usr/share/apache-tomcat-8.0.18/bin/** as I have version 8.0.18 installed in my CentOS 7 Server.
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$ cd /usr/share/apache-tomcat-8.0.18/bin
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**Note: Please replace 8.0.18 to the version of Apache Tomcat installed in your system. **
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Inside the bin folder, there is a script file named catalina.sh . Thats the script file which we'll gonna edit and add a line of configuration which will bind tomcat to IPv4 . You can see that file by running **ls** into a terminal or shell.
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$ ls
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### 3. Configuring Catalina.sh ###
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Now, we'll add **JAVA_OPTS= "$JAVA_OPTS -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Addresses"** to that scripting file catalina.sh at the end of the file as shown in the figure below. We can edit the file using our favorite text editing software like nano, vim, etc. Here, we'll gonna use nano.
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$ nano catalina.sh
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Then, add to the file as shown below:
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**JAVA_OPTS= "$JAVA_OPTS -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Addresses"**
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Now, as we've added the configuration to the file, we'll now save and exit nano.
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### 4. Restarting ###
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Now, we'll restart our tomcat server to get our configuration working. We'll need to first execute shutdown.sh and then startup.sh .
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$ ./shutdown.sh
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Now, well run execute startup.sh as:
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$ ./startup.sh
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This will restart our tomcat server and the configuration will be loaded which will ultimately bind the server to IPv4.
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### Conclusion ###
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Hurray, finally we'have got our tomcat server bind to IPv4 running in our CentOS 7 Linux Distribution. Binding to IPv4 is easy and is necessary if your Tomcat server is bind to IPv6 which will infact will make your tomcat server not working as IPv6 is not used these days and may come into practice in coming future. If you have any questions, comments, feedback please do write on the comment box below and let us know what stuffs needs to be added or improved. Thank You! Enjoy :-)
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--------------------------------------------------------------------------------
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via: http://linoxide.com/linux-how-to/bind-apache-tomcat-ipv4-centos/
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作者：[Arun Pyasi][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://linoxide.com/author/arunp/
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[1]:http://www.apache.org/
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[2]:http://linoxide.com/linux-how-to/install-tomcat-8-centos-7/
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@ -0,0 +1,77 @@
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在CentOS或者Redhat中如何为Apache Tomcat绑定IPv4
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================================================================================
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今天我们来学习一下如何在CentOS 7 Linux分布式系统中为Tomcat绑定IPv4
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**Apache Tomcat** 是由[Apache Software Foundation][1] 开发的开源web服务器和servlet容器。它实现了Java Servlet，JavaServer页面（JSP），Java的统一表达式语言，以及Sun Microsystems的Java的WebSocket规范，并提供了一个运行java代码的web服务器环境。
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如果由于默认绑定tomcat到IPv6而导致我们的web服务器不能正常工作，就有必要将tomcat绑定到IPv4。众所周知，IPv6是为设备分配IP地址的现代方法，虽然在不久的将来也许会得到应用，但是现在并没有得到完全应用。由于没有用处，目前我们并不需要将我们的Tomcat服务器向IPv6转换，我们应该将其绑定到IPv4。
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在开始将tomcat绑定到IPv4之前，我们应该确保在我们的CentOS 7中已经安装了tomcat。这是一个[如何在CentOS 7.0服务器中安装tomcat 8][2]的指导。
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### 1. 切换到tomcat用户 ###
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首先，我们要切换到 **tomcat** 用户。我们可以通过在shell或者终端中运行 **su tomcat** 命令完成。
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# su tomcat
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### 2. 找到文件 Catalina.sh ###
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现在我们要进入Apache Tomcat安装目录下的bin文件夹，通常是 **/usr/share/apache-tomcat-8.0.x/bin/**， 这里的x是 Apache Tomcat发行版的子版本号。因为我的CentOS 7服务器中安装的版本是8.0.18，这里我的目录是 **/usr/share/apache-tomcat-8.0.18/bin/**。
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$ cd /usr/share/apache-tomcat-8.0.18/bin
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**注意：请用你系统中安装的Apache Tomcat的版本号替换8.0.18。**
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在bin目录中，有一个名字是catalina.sh的脚本文件。这就是我们要编辑的文件，我们将在里面增加一行将tomcat绑定到IPv4的配置信息。你可以通过在shell或者终端中运行命令 **ls** 来查看这个文件。
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$ ls
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### 3. 配置 Catalina.sh ###
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如图所示，我们将在catalina.sh脚本文件的最后增加一行 **JAVA_OPTS= "$JAVA_OPTS -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Addresses"**。我们可以使用我们喜欢的文本编辑器来编辑这个文件，例如nano,vim等等。这里我们使用nano。
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$ nano catalina.sh
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然后，如下图所示，将 **JAVA_OPTS= "$JAVA_OPTS -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Addresses"** 增加到文件。
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现在，我们已经将配置信息增加到文件中。保存文件并退出nano。
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### 4. 重启 ###
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现在，我们通过重启tomcat服务器使配置生效。我们要先运行shutdown.sh，然后运行startup.sh。
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$ ./shutdown.sh
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运行可执行文件startup.sh:
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$ ./startup.sh
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这将重启我们的tomcat服务器并加载将服务器绑定到IPv4的配置信息。
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### 结尾 ###
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好了，我们终于将我们运行在CentOS 7 Linux分布式系统上的tomcat服务器绑定到IPv4上了。尽管IPv6在不久的将来也许会得到应用，但由于现在还没有使用，如果因为将你的Tomcat服务器绑定到IPv6上而使得你的tomcat服务器不工作，就有必要将tomcat绑定到IPv4上，这也很简单。如果你有任何疑问，建议，反馈，请在下面的评论框中写下来，让我们知道有什么需要增加或者改进。非常感谢！
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--------------------------------------------------------------------------------
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via: http://linoxide.com/linux-how-to/bind-apache-tomcat-ipv4-centos/
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作者：[Arun Pyasi][a]
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译者：[ictlyh](https://github.com/ictlyh)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://linoxide.com/author/arunp/
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[1]:http://www.apache.org/
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[2]:http://linoxide.com/linux-how-to/install-tomcat-8-centos-7/
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