// Tutorial //

How To Install Apache Tomcat 9 on Ubuntu 18.04

Published on July 6, 2018
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By Justin Ellingwood
Developer and author at DigitalOcean.
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How To Install Apache Tomcat 9 on Ubuntu 18.04
Not using Ubuntu 18.04?Choose a different version or distribution.
Ubuntu 18.04

Introduction

Apache Tomcat is a web server and servlet container that is used to serve Java applications. Tomcat is an open source implementation of the Java Servlet and JavaServer Pages technologies, released by the Apache Software Foundation. This tutorial covers the basic installation and some configuration of the latest release of Tomcat 9 on your Ubuntu 18.04 server.

Prerequisites

Before you begin with this guide, you should have a non-root user with sudo privileges set up on your server. You can learn how to do this by completing our Ubuntu 18.04 initial server setup guide.

Step 1 — Install Java

Tomcat requires Java to be installed on the server so that any Java web application code can be executed. We can satisfy that requirement by installing OpenJDK with apt.

First, update your apt package index:

  1. sudo apt update

Then install the Java Development Kit package with apt:

  1. sudo apt install default-jdk

Now that Java is installed, we can create a tomcat user, which will be used to run the Tomcat service.

Step 2 — Create Tomcat User

For security purposes, Tomcat should be run as an unprivileged user (i.e. not root). We will create a new user and group that will run the Tomcat service.

First, create a new tomcat group:

  1. sudo groupadd tomcat

Next, create a new tomcat user. We’ll make this user a member of the tomcat group, with a home directory of /opt/tomcat (where we will install Tomcat), and with a shell of /bin/false (so nobody can log into the account):

  1. sudo useradd -s /bin/false -g tomcat -d /opt/tomcat tomcat

Now that our tomcat user is set up, let’s download and install Tomcat.

Step 3 — Install Tomcat

The best way to install Tomcat 9 is to download the latest binary release then configure it manually.

Find the latest version of Tomcat 9 at the Tomcat 9 Downloads page. At the time of writing, the latest version is 9.0.10, but you should use a later stable version if it is available. Under the Binary Distributions section, then under the Core list, copy the link to the “tar.gz”. In most browsers you can do this by right-clicking the link and selecting Copy Link Address or a similar option.

Next, change to the /tmp directory on your server. This is a good directory to download ephemeral items, like the Tomcat tarball, which we won’t need after extracting the Tomcat contents:

  1. cd /tmp

Use curl to download the link that you copied from the Tomcat website:

  1. curl -O paste_the_copied_link_here

We will install Tomcat to the /opt/tomcat directory. Create the directory, then extract the archive to it with these commands:

  1. sudo mkdir /opt/tomcat
  2. sudo tar xzvf apache-tomcat-*tar.gz -C /opt/tomcat --strip-components=1

Next, we can set up the proper user permissions for our installation.

Step 4 — Update Permissions

The tomcat user that we set up needs to have access to the Tomcat installation. We’ll set that up now.

Change to the directory where we unpacked the Tomcat installation:

  1. cd /opt/tomcat

Give the tomcat group ownership over the entire installation directory:

  1. sudo chgrp -R tomcat /opt/tomcat

Next, give the tomcat group read access to the conf directory and all of its contents, and execute access to the directory itself:

  1. sudo chmod -R g+r conf
  2. sudo chmod g+x conf

Make the tomcat user the owner of the webapps, work, temp, and logs directories:

  1. sudo chown -R tomcat webapps/ work/ temp/ logs/

Now that the proper permissions are set up, we can create a systemd service file to manage the Tomcat process.

Step 5 — Create a systemd Service File

We want to be able to run Tomcat as a service, so we will set up systemd service file.

Tomcat needs to know where Java is installed. This path is commonly referred to as “JAVA_HOME”. The easiest way to look up that location is by running this command:

  1. sudo update-java-alternatives -l
Output
java-1.11.0-openjdk-amd64 1081 /usr/lib/jvm/java-1.11.0-openjdk-amd64

Your JAVA_HOME is the output from the last column (highlighted in red). Given the example above, the correct JAVA_HOME for this server would be:

JAVA_HOME
/usr/lib/jvm/java-1.11.0-openjdk-amd64

Your JAVA_HOME may be different.

With this piece of information, we can create the systemd service file. Open a file called tomcat.service in the /etc/systemd/system directory by typing:

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

Paste the following contents into your service file. Modify the value of JAVA_HOME if necessary to match the value you found on your system. You may also want to modify the memory allocation settings that are specified in CATALINA_OPTS:

/etc/systemd/system/tomcat.service
[Unit]
Description=Apache Tomcat Web Application Container
After=network.target

[Service]
Type=forking

Environment=JAVA_HOME=/usr/lib/jvm/java-1.11.0-openjdk-amd64
Environment=CATALINA_PID=/opt/tomcat/temp/tomcat.pid
Environment=CATALINA_HOME=/opt/tomcat
Environment=CATALINA_BASE=/opt/tomcat
Environment='CATALINA_OPTS=-Xms512M -Xmx1024M -server -XX:+UseParallelGC'
Environment='JAVA_OPTS=-Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom'

ExecStart=/opt/tomcat/bin/startup.sh
ExecStop=/opt/tomcat/bin/shutdown.sh

User=tomcat
Group=tomcat
UMask=0007
RestartSec=10
Restart=always

[Install]
WantedBy=multi-user.target

When you are finished, save and close the file.

Next, reload the systemd daemon so that it knows about our service file:

  1. sudo systemctl daemon-reload

Start the Tomcat service by typing:

  1. sudo systemctl start tomcat

Double check that it started without errors by typing:

  1. sudo systemctl status tomcat

Step 6 — Adjust the Firewall and Test the Tomcat Server

Now that the Tomcat service is started, we can test to make sure the default page is available.

Before we do that, we need to adjust the firewall to allow our requests to get to the service. If you followed the prerequisites, you will have a ufw firewall enabled currently.

Tomcat uses port 8080 to accept conventional requests. Allow traffic to that port by typing:

  1. sudo ufw allow 8080

With the firewall modified, you can access the default splash page by going to your domain or IP address followed by :8080 in a web browser:

Open in web browser
http://server_domain_or_IP:8080

You will see the default Tomcat splash page, in addition to other information. However, if you click the links for the Manager App, for instance, you will be denied access. We can configure that access next.

If you were able to successfully accessed Tomcat, now is a good time to enable the service file so that Tomcat automatically starts at boot:

  1. sudo systemctl enable tomcat

Step 7 — Configure Tomcat Web Management Interface

In order to use the manager web app that comes with Tomcat, we must add a login to our Tomcat server. We will do this by editing the tomcat-users.xml file:

  1. sudo nano /opt/tomcat/conf/tomcat-users.xml

You will want to add a user who can access the manager-gui and admin-gui (web apps that come with Tomcat). You can do so by defining a user, similar to the example below, between the tomcat-users tags. Be sure to change the username and password to something secure:

tomcat-users.xml — Admin User
<tomcat-users . . .>
    <user username="admin" password="password" roles="manager-gui,admin-gui"/>
</tomcat-users>

Save and close the file when you are finished.

By default, newer versions of Tomcat restrict access to the Manager and Host Manager apps to connections coming from the server itself. Since we are installing on a remote machine, you will probably want to remove or alter this restriction. To change the IP address restrictions on these, open the appropriate context.xml files.

For the Manager app, type:

  1. sudo nano /opt/tomcat/webapps/manager/META-INF/context.xml

For the Host Manager app, type:

  1. sudo nano /opt/tomcat/webapps/host-manager/META-INF/context.xml

Inside, comment out the IP address restriction to allow connections from anywhere. Alternatively, if you would like to allow access only to connections coming from your own IP address, you can add your public IP address to the list:

context.xml files for Tomcat webapps
<Context antiResourceLocking="false" privileged="true" >
  <!--<Valve className="org.apache.catalina.valves.RemoteAddrValve"
         allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" />-->
</Context>

Save and close the files when you are finished.

To put our changes into effect, restart the Tomcat service:

  1. sudo systemctl restart tomcat

Step 8—Access the Web Interface

Now that we have create a user, we can access the web management interface again in a web browser. Once again, you can get to the correct interface by entering your server’s domain name or IP address followed on port 8080 in your browser:

Open in web browser
http://server_domain_or_IP:8080

The page you see should be the same one you were given when you tested earlier:

Tomcat root

Let’s take a look at the Manager App, accessible via the link or http://server_domain_or_IP:8080/manager/html. You will need to enter the account credentials that you added to the tomcat-users.xml file. Afterwards, you should see a page that looks like this:

Tomcat Web Application Manager

The Web Application Manager is used to manage your Java applications. You can Start, Stop, Reload, Deploy, and Undeploy here. You can also run some diagnostics on your apps (i.e. find memory leaks). Lastly, information about your server is available at the very bottom of this page.

Now let’s take a look at the Host Manager, accessible via the link or http://server_domain_or_IP:8080/host-manager/html/:

Tomcat Virtual Host Manager

From the Virtual Host Manager page, you can add virtual hosts to serve your applications from.

Conclusion

Your installation of Tomcat is complete! Your are now free to deploy your own Java web applications!

Currently, your Tomcat installation is functional, but entirely unencrypted. This means that all data, including sensitive items like passwords, are sent in plain text that can be intercepted and read by other parties on the internet. In order to prevent this from happening, it is strongly recommended that you encrypt your connections with SSL. You can find out how to encrypt your connections to Tomcat by following this guide (note: this guide covers Tomcat 8 encryption on Ubuntu 16.04).


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How are we supposed to deploy WARs into the “webapps” folder if it is owned by the “tomcat” user?

Great tutorial! Everything went smmothly until I tried to log in to the Web App Manager using the creds I defined in conf/tomcat-users.xml.

No matter which web remedy I try, the manager rejects these credentials. And again, and again, and again. Ad nauseam.

I followed this tutorial to the letter. Any help here would be greatly appreciated.

Hello, this tutorial does not work for me. Basically, systemd tries to stop Tomcat right after it starts. I described the problem thoroughly here: https://serverfault.com/questions/946034/systemctl-stops-tomcat-service-immediately-after-start

I found this interesting reading which you may find helpful: https://jdebp.eu/FGA/systemd-house-of-horror/tomcat.html

I have use ubuntu 18.04 , having 1 GB Ram the 5$ per month.it not working and facing issue into sudo chmod -R g+r conf sudo chmod g+x conf Error code display is : chmod: cannot access ‘conf’ : No such file or directory when i ignore this message and going to move next step and start tomcat server. display message : Fail to start Apache Tomcat web application.

Please help on this issue.

Wonderfull. It is really good. I can start my tomcat without needing further documents

Thank you,works great.But could you tell me how to get tomcat installation directory to create a server in eclipse.

I am getting an error when visiting domain:8081. ERR_CONNECTION_RESET Any suggestions? Please note that I have jenkins running as well so I’ve changed tomcat port to 8081 and the serer port from 8005 to 8006 due to conflict.

Log:

NOTE: Picked up JDK_JAVA_OPTIONS:  --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED
10-Sep-2020 10:11:25.989 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server version name:   Apache Tomcat/9.0.37
10-Sep-2020 10:11:26.012 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server built:          Jun 30 2020 20:09:49 UTC
10-Sep-2020 10:11:26.013 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server version number: 9.0.37.0
10-Sep-2020 10:11:26.013 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name:               Linux
10-Sep-2020 10:11:26.013 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Version:            4.15.0-117-generic
10-Sep-2020 10:11:26.013 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Architecture:          amd64
10-Sep-2020 10:11:26.013 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Java Home:             /usr/lib/jvm/java-11-openjdk-amd64
10-Sep-2020 10:11:26.013 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Version:           11.0.8+10-post-Ubuntu-0ubuntu118.04.1
10-Sep-2020 10:11:26.013 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Vendor:            Ubuntu
10-Sep-2020 10:11:26.014 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE:         /opt/tomcat
10-Sep-2020 10:11:26.014 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME:         /opt/tomcat
10-Sep-2020 10:11:26.203 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: --add-opens=java.base/java.lang=ALL-UNNAMED
10-Sep-2020 10:11:26.204 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: --add-opens=java.base/java.io=ALL-UNNAMED
10-Sep-2020 10:11:26.204 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED
10-Sep-2020 10:11:26.204 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.config.file=/opt/tomcat/conf/logging.properties
10-Sep-2020 10:11:26.204 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
10-Sep-2020 10:11:26.204 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.awt.headless=true
10-Sep-2020 10:11:26.204 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.security.egd=file:/dev/./urandom
10-Sep-2020 10:11:26.205 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djdk.tls.ephemeralDHKeySize=2048
10-Sep-2020 10:11:26.205 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.protocol.handler.pkgs=org.apache.catalina.webresources
10-Sep-2020 10:11:26.205 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dorg.apache.catalina.security.SecurityListener.UMASK=0027
10-Sep-2020 10:11:26.205 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Xms512M
10-Sep-2020 10:11:26.205 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Xmx1024M
10-Sep-2020 10:11:26.205 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -XX:+UseParallelGC
10-Sep-2020 10:11:26.205 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dignore.endorsed.dirs=
10-Sep-2020 10:11:26.206 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.base=/opt/tomcat
10-Sep-2020 10:11:26.206 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.home=/opt/tomcat
10-Sep-2020 10:11:26.206 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.io.tmpdir=/opt/tomcat/temp
10-Sep-2020 10:11:26.206 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent The Apache Tomcat Native library which allows using OpenSSL was not found on the java.library.path: [/usr/java/packages/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib]
10-Sep-2020 10:11:28.909 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-8081"]
10-Sep-2020 10:11:29.147 INFO [main] org.apache.catalina.startup.Catalina.load Server initialization in [6393] milliseconds
10-Sep-2020 10:11:29.546 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]
10-Sep-2020 10:11:29.550 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet engine: [Apache Tomcat/9.0.37]
10-Sep-2020 10:11:29.571 SEVERE [main] org.apache.catalina.startup.HostConfig.beforeStart Unable to create directory for deployment: [/opt/tomcat/conf/Catalina/localhost]
10-Sep-2020 10:11:29.602 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/tomcat/webapps/docs]
10-Sep-2020 10:11:31.004 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/opt/tomcat/webapps/docs] has finished in [1,401] ms
10-Sep-2020 10:11:31.007 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/tomcat/webapps/examples]
10-Sep-2020 10:11:32.533 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/opt/tomcat/webapps/examples] has finished in [1,525] ms
10-Sep-2020 10:11:32.537 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/tomcat/webapps/manager]
10-Sep-2020 10:11:32.769 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/opt/tomcat/webapps/manager] has finished in [232] ms
10-Sep-2020 10:11:32.773 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/tomcat/webapps/host-manager]
10-Sep-2020 10:11:32.917 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/opt/tomcat/webapps/host-manager] has finished in [143] ms
10-Sep-2020 10:11:32.920 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/o10-Sep-2020 10:11:29.571 SEVERE [main] org.apache.catalina.startup.HostConfig.beforeStart Unable to create directory for deployment: [/opt/tomcat/conf/Catalina/localhost]
10-Sep-2020 10:11:29.602 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/tomcat/webapps/docs]
10-Sep-2020 10:11:31.004 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/opt/tomcat/webapps/docs] has finished in [1,401] ms
10-Sep-2020 10:11:31.007 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/tomcat/webapps/examples]
10-Sep-2020 10:11:32.533 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/opt/tomcat/webapps/examples] has finished in [1,525] ms
10-Sep-2020 10:11:32.537 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/tomcat/webapps/manager]
10-Sep-2020 10:11:32.769 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/opt/tomcat/webapps/manager] has finished in [232] ms
10-Sep-2020 10:11:32.773 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/tomcat/webapps/host-manager]
10-Sep-2020 10:11:32.917 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/opt/tomcat/webapps/host-manager] has finished in [143] ms
10-Sep-2020 10:11:32.920 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/tomcat/webapps/ROOT]
10-Sep-2020 10:11:33.046 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/opt/tomcat/webapps/ROOT] has finished in [127] ms
10-Sep-2020 10:11:33.072 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8081"]
10-Sep-2020 10:11:33.139 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in [3991] milliseconds

After following all the steps using Tomcat 9.0.33 And same Java as the instructions the page does not open on port 8080. I am trying to install it on a Plesk Server. I don’t know if there is a conflict.

There are one errors in this tutorial: The current version of apache-tomcat in the repository: mirror.cc.columbia.edu is:

http://mirror.cc.columbia.edu/pub/software/apache/tomcat/tomcat-9/v9.0.27/bin/apache-tomcat-9.0.27.tar.gz (or .zip)

Date: 13/Nov/2019 $ lsb_release -d Description: Ubuntu 18.04.3 LTS