Apache Tomcat

We could easily define Apache Tomcat as a web server with exclusive support for Servlets and JSP applications. This is similar to Apache or Nginx with HTML or PHP. So, imagine a large number of server-side applications that use Java. Everyone at the end must use software like Tomcat.

Also, Tomcat has a big advantage in its license. It is open-source and very permissive. You can use it in purely professional projects or in educational and personal projects. With a well-maintained code, Tomcat is a leader in its sector.

That’s why we are going to install it on CentOS 8.

Install Apache Tomcat on CentOS 8

Apache Tomcat does not come by default in the official repositories of the distribution, so it must be downloaded and installed manually. The advantage of this method is that we can have the latest stable version at the time of installation.

The first step is to update your CentOS 8 server. To do this, connect to it using SSH. In its defect, opens a terminal session, if it is a personal computer.

:~$ su
:~# dnf update

With this, you will have the latest security patches in the system. This makes it a more secure and stable system.

Then you need to install Java 1.8. The good thing is that it comes in the repositories, then, the installation is achieved with the following command:

:~# dnf install java-1.8.0-openjdk-devel

After this, make sure wget is installed because we will use it to download Apache Tomcat.

:~# dnf install wget

Then, download Apache Tomcat.

:~# cd /opt/
:~# wget http://mirrors.advancedhosters.com/apache/tomcat/tomcat-8/v8.5.46/bin/apache-tomcat-8.5.46.zip

Of course, you can use another mirror to download it.

Then, unzip the file and create a new symbolic link to the folder.

:~# unzip apache-tomcat-8.5.46.zip
:~# ln -s /opt/apache-tomcat-8.5.46 /opt/tomcat

To avoid problems in running Tomcat, it is better to add a user to the system and make it the owner of the Tomcat folder.

:~# useradd tomcat
:~# chown -R tomcat:tomcat /opt/apache-tomcat-8.5.46

It is recommended to use Tomcat as a system service. To do this we will have to manually create it:

:~# nano /etc/systemd/system/tomcat.service

And add the following:

[Unit]
Description=Tomcat
After=syslog.target network.target

[Service]
Type=forking
User=tomcat
Group=tomcat
ExecStart=/opt/tomcat/bin/catalina.sh start
ExecStop=/opt/tomcat/bin/catalina.sh stop

[Install]
WantedBy=multi-user.target

For changes to take effect, services must be recharged. Then, give permission for Tomcat binaries to run. And to access the web interface that can serve other servlets and applications, it is necessary to open port 8080 in the firewall.

:~# systemctl daemon-reload
:~# chmod +x /opt/tomcat/bin/*.sh
:~# firewall-cmd --zone=public --add-port=8080/tcp --permanent 
success
:~# firewall-cmd --reload
success

Finally, it starts the service and checks its status to confirm that everything is in order. If you want you can make Tomcat start with the system.

:~# systemctl start tomcat
:~# systemctl enable tomcat
:~# systemctl status tomcat

Now, open your web browser and go to http://your-server:8080. You will see something like this.

And that is it.

Conclusion

In this post, you have learned how to install Apache Tomcat on CentOS 8. With some requirements but the program is powerful enough to serve JSP applications for the web. With pretty good performance and even better documentation. It remains to make the most of it.

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The post How to install Apache Tomcat on CentOS 8? appeared first on Linux Windows and android Tutorials.

In short, Apache Tomcat executes Java servlets and renders Web pages that include Java Server Page coding. It constitutes a base element for the development with Java. It is very popular and it is open source.

This time I will install using CentOS 7, which is a Red Hat-based Linux distribution for use on Servers.

What you need

The process is very simple and you should not take long to do it, but it is good that you know that there are some small requirements to successfully complete this tutorial.

• A server with CentOS 7 installed and allowing access via ssh.
• A basic knowledge about the use of commands in the terminal.
• A user who allows commands to be run as root. Or root access.

I think this will be enough for you to do everything without problems.

Let’s get to work.

1. Upgrade the system

In order to have the latest security patches, it is necessary to update the system completely. Also with this, you will have a more secure server and in many cases faster. Run as root user:

:~# yum update

That’s enough.

2.- Install Java

To install Apache Tomcat you first need to install Java because it is a dependency. To do this, type the following:

:~# yum install java-1.8.0-openjdk.x86_64 java-1.8.0-openjdk-devel.x86_64

Next, check the installed Java version.

:~# java -version

As you can see, Java was correctly installed. This was done because Apache Tomcat 9 requires at least Java 8.

3. Install Apache Tomcat 9

Go to the official Apache Tomcat site and download the latest stable version.

Of course, you are working on a server, the best is to get the link directly and run:

:~# cd /opt/
:~# wget http://ftp.wayne.edu/apache/tomcat/tomcat-9/v9.0.12/bin/apache-tomcat-9.0.12.zip

Now proceed to decompress it.

:~# unzip apache-tomcat-9.0.12.zip

Then, rename the decompressed file to a simpler one.

:~# mv apache-tomcat-9.0.12 tomcat

Next, you have to set the CATALINA_HOME environment variable.

:~# echo "export CATALINA_HOME='/opt/tomcat/'" >> ~/.bashrc
:~# source ~/.bashrc

If you are going to install Apache Tomcat on a public server, then it is preferable to create a new system user to run it.

:~# useradd -r tomcat --shell /bin/false

Then, it changes the ownership of the folder to that of the new user. I named it to tomcat.

:~# chown -R tomcat:tomcat /opt/tomcat/

4. Making Apache Tomcat as a service

To properly handle Apache Tomcat, it is a good idea to create a file that is made by a system service. This way you can start it, restart it or stop it in a simpler way. Run:

:~# nano /etc/systemd/system/tomcat.service

And put the following:

[Unit]
Description=Apache Tomcat 9
After=syslog.target network.target

[Service]
User=tomcat
Group=tomcat
Type=forking
Environment=CATALINA_PID=/opt/tomcat/tomcat.pid
Environment=CATALINA_HOME=/opt/tomcat
Environment=CATALINA_BASE=/opt/tomcat
ExecStart=/opt/tomcat/bin/startup.sh
ExecStop=/opt/tomcat/bin/shutdown.sh
Restart=on-failure

[Install]
WantedBy=multi-user.target

Save and close the file. Now run:

:~# systemctl daemon-reload

5. Create an Apache Tomcat user account

To access Tomcat Manager, you have to create a new user. The process is simple, you have to edit the file /opt/tomcat/conf/tomcat-users.xml.

:~# nano /opt/tomcat/conf/tomcat-users.xml

And add the following:

<role rolename="admin-gui"/>
<user username="admin" password="PASSWORD" roles="manager-gui,admin-gui"/>
</tomcat-users>

Remember to change “PASSWORD” for your real password.

6. Starting the service and accessing through a web browser

Now you can start the Apache Tomcat service. Then check its status and finally access it from the web browser.

Now, you can start Apache Tomcat either using systemctl or from its own script.

:~# sh /opt/tomcat/bin/startup.sh

Now go to http://IP_SERVER/manage/html and log in with your username and your password.

Conclusion

Apache Tomcat is a vital tool for Java development and its installation is really simple on Linux and CentOS 7.

Let us know about you, Java programs? what is your experience with Tomcat? Did you find the tutorial easy?

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Apache GUI is a free and open source web tool that is designed to help Administrate the Apache Web Server. Some of its functions are:

• Edit, Search and Validate your Configurations.
• Manage VirtualHosts.
• Edit web documents right from your web browser.
• Tail, download and search your logs.
• Install and remove Apache modules.
• View runtime statistics from your web server.
• Record, search and graph detailed transactions.

As you can see, this is a very useful tool especially if you are starting in the sysadmin world or if you prefer the convenience of a web interface over the terminal.

What you need to install it

To install Apache GUI, in the first place, you need a user who can execute commands as a superuser, for example, a user who can execute sudo. On the other hand, it is useful that you have some knowledge about terminal handling. And finally, to have a PC with Debian 9. Obvious, isn’t it?

1. Upgrade the system

In order to guarantee the correct functioning of the server, it is convenient to have the latest security patches installed. With this, you not only get stability but also performance and security improvements.

Open a terminal and run:

:~$ sudo -i

After entering the password, you will be able to update the computer. Run:

:~# apt update && apt upgrade

With this, you will have your Debian 9 updated.

2. Installing Java

Apache GUI is built with Java, so you must install Java on the server to run it. Run:

:~# apt install openjdk-8-jre

Then to check that java has indeed been installed, run:

:~# java -version

With this, Java has been installed.

3. Installing Apache web server and PHP

For a good running, Apache GUI requires that you install PHP. And obviously, you have also install apache web server.

First, install apache. Run:

:~# apt install apache2

It then enables the service for apache2 to run at system startup.

:~# systemctl enable apache2
:~# systemctl start apache2

Finally, verify that the installation has occurred satisfactorily. Go to a web browser and access to http://IP_SERVER. You should see something like this.

With this apache2 web server is correctly installed.

Now continue with PHP. Run:

:~# apt install php7.0 php7.0-imap php7.0-xml libapache2-mod-php7.0 php-pear

To prove that the PHP installation has been successful. Create a file called test.php in the /var/www/html/ directory and place the following:

:~# nano /var/www/html/test.php

<?php
phpinfo();
?>

Go to your web browser and open it http://IP_SERVER/test.php.

PHP and Apache are correctly installed and working.

4. Install Apache GUI

It’s time for the green, now it’s time to install Apache GUI. First, you have to create a folder, access it and download the program.

:~# mkdir/usr/local/apachegui/
:~# cd /usr/local/apachegui/
:~# wget https://sourceforge.net/projects/apachegui/files/1.12-Linux-Solaris-Mac/ApacheGUI-1.12.0.tar.gz

Now unzip the downloaded file.

:~# tar -xvzf ApacheGUI-1.12.0.tar.gz

Then, change the directory to the Apache GUI directory and launch the installation script.

:~# cd ApacheGUI/bin/
:~#  ./run.sh

With this, it’s already installed. Now go to your browser and access with the IP address of the server and port 9999.

http.//IP_SERVER:9999/ApacheGUI

As you can see, you have two options. Choose the first post you installed apache2 from the official Debian repositories.

Then you’ll see this screen. On that screen, you must place the credentials and folders where apache works. Don’t worry about the first field, there is a drop-down list and choose “Debian and Ubuntu” and the fields will be filled in. Then in username and password define the credentials.

Finally, you will see this screen.

Apache GUI is now correctly installed and configured in Debian 9.

If you want to close the application, write:

:~# ./stop.sh

This type of application is useful for users who have a graphical alternative to configure such an important program as Apache.

Tell us, how was the installation? Have you used it? What is your experience with Apache?

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