A Step by Step Information to Putting in Apache Tomcat 9 Linux

Apache Tomcat is an open source web server and servlet container for running Java applications. It is the most popular application server used with Java web applications. There are hundreds of companies including eBay, Alibaba, and MIT that use it.

This tutorial is a step-by-step guide on how to download Tomcat 9.0.45. The code here has been tested on Debian 10. That means that if you're using a Debian-based distribution like Ubuntu or Kali Linux (or Debian itself) you can follow suit.

Requirements for Apache Tomcat 9

You must be a user with sudo Privileges. If you are not a sudo / root user, you can do the following to get this user right:

a) Create a new user

register as root and enter the following command in your terminal:

$ adduser newuser

You will be asked to enter a password. Make sure it is strong and secure. You will also be asked for additional information like your name and phone number. This is optional and trivial. You can just hit enter to skip.

b) Add the user to the sudo group

$ usermod -aG sudo newuser

You now have a sudo user named New User.

Related: Add a user to the Sudoers group

Step 1: Install OpenJDK

To install Tomcat 9, Java Standard Edition (SE) 8 or higher must be installed. To do this, install OpenJDK, an open source implementation of Java SE and Java Development Kit (JDK).

First of all, you need to update our apt package:

$ sudo apt update

Then next:

$ sudo apt install default-jdk

At the time of this writing, OpenJDK14 is the latest version of OpenJDK. After the installation is complete, verify the installation by checking your Java version as follows:

$ java -version

Step 2: Create a Tomcat User

You can use Tomcat as root, but it poses a serious security threat. Therefore, you will need to create a new user to run the service with a home directory of / opt / tomcat. In this directory you install Tomcat, which was created with a shell from / bin / false so that nobody can log in.

To do this, run the following command:

$ sudo useradd -m -U -d / opt / tomcat -s / bin / false tomcat

Step 3: Install Tomcat

The official Tomcat binary distribution can be found on the Tomcat download page.

You can use the … wget Command to download the Tomcat zip file to the / tmp Directory, a temporary folder.

$ cd / tmp
$ wget https://mirror.kiu.ac.ug/apache/tomcat/tomcat-9/v9.0.45/bin/apache-tomcat-9.0.45.tar.gz

If you have problems using it wget, You can optional use the Curls Command to download Tomcat. Download first Curls::

$ sudo apt install curl

Then use Curl with the link you got from the Tomcat website:

$ curl -O https://mirror.kiu.ac.ug/apache/tomcat/tomcat-9/v9.0.45/bin/apache-tomcat-9.0.45.tar.gz

NOTE: If you used wgetThere is no need to use Curls also. Both achieve the same goal.

When the download is complete, extract the archive into the / opt / tomcat Directory:

$ sudo mkdir / opt / tomcat
$ tar -xf apache-tomcat-9.0.45.tar.gz
$ sudo mv apache-tomcat-9.0.45 / opt / tomcat /

Tomcat receives regular updates with security fixes and patches. Create a symbolic link with the name to make sure you have more control over these updates latest which points to the installation directory.

$ sudo ln -s /opt/tomcat/apache-tomcat-9.0.45 / opt / tomcat / latest

When you receive an update, all you have to do is unzip your download and point it to the symbolic link.

Next, update the permissions. The following command gives permission to the Tomcat user and the Tomcat group:

$ sudo chown -R hangover: / opt / tomcat

You need to create the shell scripts in Tomcats container Executable file directory:

$ sudo sh -c & # 39; chmod + x /opt/tomcat/latest/bin/*.sh'

Step 4: create a devices file

You need to run Tomcat as a service instead of using shell scripts. This requires a systemd device file in the / etc / systemd / system / Directory:

$ sudo nano /etc/systemd/system/tomcat.service

Now insert the following configuration.

Description = Tomcat 9.0 Servlet Container
After = network.target
Type = fork
User = hangover
Group = hangover
Environment = "JAVA_HOME = / usr / lib / jvm / default-java"
Environment = "JAVA_OPTS = -Djava.security.egd = file: /// dev / urandom"
Environment = "CATALINA_BASE = / opt / tomcat / latest"
Environment = "CATALINA_HOME = / opt / tomcat / latest"
Environment = "CATALINA_PID = / opt / tomcat / latest / temp / tomcat.pid"
Environment = "CATALINA_OPTS = -Xms512M -Xmx1024M -server -XX: + UseParallelGC"
ExecStart = / opt / tomcat / latest / bin / startup.sh
ExecStop = / opt / tomcat / latest / bin / shutdown.sh
(To install)
WantedBy = multi-user.target

Save and close the file. Then reload systemctl to ensure that the new changes are confirmed by the system:

$ sudo systemctl daemon-reload

Now start the Tomcat service:

$ sudo systemctl start Tomcat

Check that the application started without errors:

$ sudo systemctl status tomcat

The above output confirms that the Tomcat server is up and running.

You can manage your Tomcat service at any time like any other systemd service:

$ sudo systemctl start Tomcat
$ sudo systemctl stop tomcat
$ sudo systemctl restart Tomcat

Step 5: Configure the firewall settings

You may need to access your server from your local network. To do this, adjust your firewall settings and open port 8080.

$ sudo ufw allow 8080 / tcp

After changing the firewall permissions, you can now access the default Tomcat page by going to Your IP address: 8080 in your web browser. At this point, don't click the link for your manager app as you will be denied access (you can configure this later).

If you want the Tomcat service to start automatically on boot, use:

$ sudo systemctl enables Tomcat

Step 6: Configure the management interface

At this point, you will not be able to access the web administration interface because you have not yet defined Tomcat users and their roles. The tomcat-users.xml is the descriptor file. Open it in your terminal like this:

$ sudo nano /opt/tomcat/latest/conf/tomcat-users.xml

When the file is opened, it displays standard text that includes comments and examples.

Add the following code at the bottom above .

The new user now has access to the web interface (manager GUI and admin GUI). Make sure to change the password to something more secure.

Step 7: test the installation

First, restart your application:

$ sudo systemctl restart Tomcat

Then enter in your browser localhost: 8080. Once you get the following page, you will know that the installation was successful.

The Tomcat Application Manager dashboard is available at http: // localhost: 8080 / manager / html. From here you can begin managing (starting, stopping, reloading, deploying, and undeploying) your applications.

The dashboard of the virtual host manager can be reached at http: // localhost: 8080 / host-manager / html. From here you can manage your Tomcat virtual hosts.

The Tomcat is ready for use

After your installation is complete, you can deploy a Java application and play around with JSPs (Java Server Pages), servlets, and more.

At this point, your Tomcat data is completely unencrypted. Your sensitive data such as passwords are sent in clear text and can be viewed by unwanted parties. To protect yourself, you can encrypt your connections with SSL.

You can also visit the official Apache Tomcat documentation to learn more about Tomcat's features. If you're struggling to get your way, you can always reach out to the vibrant developer communities like Stack Overflow online.

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Jerome Davidson
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By Jerome Davidson

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