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This article mainly explains "how to bind IPv4 address to Apache Tomcat in CentOS". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought slowly and deeply, and study and learn "how to bind IPv4 address to Apache Tomcat in CentOS".

Today we will learn how to bind IPv4 for Tomcat in a CentOS 7 Linux distributed system.

Apache Tomcat is an open source web server and servlet container developed by the Apache Software Foundation. It implements Java Servlet,JavaServer pages (JSP), Java's Unified expression language, and Sun Microsystems's Java's WebSocket specification, and provides a web server environment for running java code.

If our web server does not work properly because tomcat binds to IPv6 by default, it is necessary to bind tomcat to IPv4. As we all know, IPv6 is a modern method of assigning IP addresses to devices, and although it may be used in the near future, it has not been fully applied now. Because it's useless, we don't need to convert our Tomcat server to IPv6 at this time, we should bind it to IPv4.

Before we start binding tomcat to IPv4, we should make sure that tomcat is installed in our CentOS 7.

1. Switch to tomcat user

First, we need to switch to the tomcat user. We can do this by running the su tomcat command in shell or in the terminal.

The code is as follows:

# su tomcat

two。 Find the file Catalina.sh

Now we need to go to the bin folder under the Apache Tomcat installation directory, usually / usr/share/apache-tomcat-8.0.x/bin/, where x is the child version number of the Apache Tomcat distribution. Because the version installed in my CentOS 7 server is 8.0.18, my directory here is / usr/share/apache-tomcat-8.0.18/bin/.

The code is as follows:

$cd / usr/share/apache-tomcat-8.0.18/bin

Note: please replace 8.0.18 with the version number of Apache Tomcat installed on your system.

In the bin directory, there is a script file named catalina.sh. This is the file we are going to edit, and we will add a line of configuration information to bind tomcat to IPv4. You can view this file by running the command ls in shell or in the terminal.

The code is as follows:

$ls

3. Configure Catalina.sh

As shown in the figure, we will add a line JAVA_OPTS= "$JAVA_OPTS-Djava.net.preferIPv4Stack=true-Djava.net.preferIPv4Addresses" at the end of the catalina.sh script file. We can use our favorite text editor to edit this file, such as nano, vim, and so on. Here we use nano.

The code is as follows:

$nano catalina.sh

Then, as shown in the following figure, add the line to the file.

Now, we have added the configuration information to the file. Save the file and exit nano.

4. Restart

Now, let's make the configuration effective by restarting the tomcat server. We need to run shutdown.sh first and then startup.sh.

The code is as follows:

$. / shutdown.sh

Run the executable file startup.sh:

The code is as follows:

$. / startup.sh

This will restart our tomcat server and load the configuration information that binds the server to IPv4.

Thank you for reading, the above is the content of "how to bind IPv4 address to Apache Tomcat in CentOS". After the study of this article, I believe you have a deeper understanding of how to bind IPv4 address to Apache Tomcat in CentOS, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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