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Installing Tomcat on Ubuntu

Fri Mar 7, 2025

Let's see the step by step by step guide on how to install tomcat on ubuntu.

  1. Launch your ubuntu instance and login to it
  2. Install java in it. Follow the link on How to Install Java on Ubuntu OS.
  3. Move to /opt directory by running below commandcd /opt
  4. Get the the tar link of the tomcat version you want to download from Tomcat Download Site
  5. In this demonstration we are going to download tomcat 10. Below is the link to download tomcat 10.https://dlcdn.apache.org/tomcat/tomcat-10/v10.1.23/bin/apache-tomcat-10.1.23.tar.gz

  1. Now use wget to download tomcatsudo wget https://dlcdn.apache.org/tomcat/tomcat-10/v10.1.23/bin/apache-tomcat-10.1.23.tar.gz
  2. Switch to root user using below commandsudo su
  3. Untar the downloaded package by running below commandtar -xzvf apache-tomcat-10.1.23.tar.gz
  4. Now rename the tomcat package to a short name by running below commandmv apache-tomcat-10.1.23 tomcat10
  5. Go inside bin directory by running below commandcd tomcat10/bin and run sh startup.sh
  6. If you are running an EC2 instance for this tomcat server make sure to allow 8080 custom TCP port in security group inbound rule. Tomcat's default port is 8080.
  7. Now type http://host-ip:8080 in your browser and you can see your tomcat running.

  1. Now if you will click on Manager App , you will get 403 Access Denied.
  2. To mitigate the above error go inside webapps manager section by running below commandcd /opt/tomcat10/webapps/manager/META-INF
  3. Now edit context.xml by running below command
vim context.xml
  1. You will see something like<!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License athttp://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <Context antiResourceLocking="false" privileged="true" > <CookieProcessor className="org.apache.tomcat.util.http.Rfc6265CookieProcessor" sameSiteCookies="strict" /> <Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" /> <Manager sessionAttributeValueClassNameFilter="java\.lang\.(?:Boolean|Integer|Long|Number|String)|org\.apache\.catalina\.filters\.CsrfPreventionFilter\$LruCache(?:\)?|java\.util\.(?:Linked)?HashMap"/> </Context>
  1. Now change Valve value to allow everything . So the edited version will be
<!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
  `http://www.apache.org/licenses/LICENSE-2.0`
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <Context antiResourceLocking="false" privileged="true" > <CookieProcessor className="org.apache.tomcat.util.http.Rfc6265CookieProcessor" sameSiteCookies="strict" /> <Valve className="org.apache.catalina.valves.RemoteAddrValve" allow=".*" /> <Manager sessionAttributeValueClassNameFilter="java\.lang\.(?:Boolean|Integer|Long|Number|String)|org\.apache\.catalina\.filters\.CsrfPreventionFilter\$LruCache(?:\)?|java\.util\.(?:Linked)?HashMap"/> </Context>
  1. Now save the file.
  2. Saved context.xml looks like

  1. Now if you will refresh your tomcat home page it will ask for credentials.

  1. Now move inside tomcat conf directorycd /opt/tomcat10/conf
  2. Now edit tomcat-users.xml file. Remove everything from the file and add below content. To remove everything >tomcat-users.xml Now run vim tomcat-users.xml
and add below content and save and quit.
   <tomcat-users>      <role rolename="manager-gui"/>      <user username="admin" password="admin" roles="manager-gui, manager-script, manager-admin, manager-status"/>   </tomcat-users>
  1. Now refresh the page and use Username: admin and Password: admin. Now you should see a page like

  1. Now lets download a sample webapp inside webapp's directory
Hello World War fileMove inside webapp directory cd /opt/tomcat10/webapps and run wget https://raw.githubusercontent.com/aeimer/java-example-helloworld-war/master/dist/helloworld.warand refresh your tomcat page. You should see something like

Chinmay Biswal
Solution Architect

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