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https://www.cloudbooklet.com/how-to-install-tomcat-9-on-ubuntu-18-04-google-cloud/

Prerequisites

1. Your Compute Engine Instance running.
2. For setting up Compute Engine, see the Setting up Compute Engine Instance.

Step 1: Install Java

Once your Google Compute Engine is up and running, connect to your instance using SSH and start by updating the packages.

sudo apt update 
sudo apt upgrade

Now you can install OpenJDK Java. Java is required fot Tomcat to serve Java applications.

sudo apt install default-jdk

Now Java will get installed and then you can proceed to create tomcat user.

Step 2: Create and Setup Tomcat User

For security purposes we shall create a non root user to run the Tomcat service.

sudo groupadd tomcat

Now you can create a new tomcat user and assign it to the home directory /opt/tomcat where we are going to install Tomcat.

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

Step 3: Install Tomcat

Now download the latest binary release of Tomcat for the official Tomcat downloads page. Under the Binary Distributions, under Core, copy the link of the file with extension tar.gz

Create the directory for Tomcat installation.

sudo mkdir /opt/tomcat

Download Tomcat with the link you have copied.

cd /tmp 
curl -O http://mirrors.estointernet.in/apache/tomcat/tomcat-9/v9.0.22/bin/apache-tomcat-9.0.22.tar.gz 
sudo tar xzvf apache-tomcat-9.0.22.tar.gz -C /opt/tomcat --strip-components=1

Step 4: Setup Permissions

Move to the directory of the Tomcat installation.

cd /opt/tomcat

Setup correct permissions for tomcat user.

sudo chgrp -R tomcat /opt/tomcat 
sudo chmod -R g+r conf 
sudo chmod g+x conf 
sudo chown -R tomcat webapps/ work/ temp/ logs/

Step 5: Create Service

To run Tomcat as a service you need to setup this with a systemd service file.

Locate the path of Java installation. Execute the below command to find the installation path.

sudo update-java-alternatives -l

Output java-1.11.0-openjdk-amd64 1081 /usr/lib/jvm/java-1.11.0-openjdk-amd64

Now, create a new file for Tomcat inside /etc/systemd/system directory.

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

Make sure to modify the JAVA_HOME with the path of your Java installation.

[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

Hit Ctrl + X followed Y and Enter to save and exit the file.

Reload the systemd daemon.

sudo systemctl daemon-reload

Now you can start Tomcat server.

sudo systemctl start tomcat

Finally enable Tomcat to startup on system boot.

sudo systemctl enable tomcat

Step 6: Configure Tomcat

To use the manager web app you need to login to the server. To setup your username and password edit the tomcat-users.xml file and edit the username and password.

sudo nano /opt/tomcat/conf/tomcat-users.xml<tomcat-users . . .> <user username="admin" password="password" roles="manager-gui,admin-gui"/> </tomcat-users>

Hit Ctrl + X followed Y and Enter to save and exit the file.

By default Tomcat restricts access to Manager and Host manager. So, to allow connections you need to remove the IP restrictions from the corresponding context.xml files.

For the Manager app the file that needs be updated is:

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

For the Host Manager app the file that needs be updated is:

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

Comment out the value section to remove the IP restriction as shown below.

<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>

Hit Ctrl + X followed Y and Enter to save and exit the file.

Step 7: Configure Firewall

By default Tomcat runs on port 8080, So you need to open port 8080 to allow connections.

In your Google Cloud Console go to VPC Network >> Firewall rules and click Create Firewall rules.

In Name enter tomcat

In Targets select All instances in the network

In Source filter select IP ranges

In Source IP ranges enter 0.0.0.0/0

In Protocols and ports check TCP and enter 8080.

Click Create.

Step 8: Access Web Interface

Now you can access your Tomcat web manager with your external IP address followed by port 8080.

http://IP_ADDRESS:8080

You will see the Tomcat welcome page.

Tomcat Web Application Manager page.

Tomcat Virtual Host Manager.

Conclusion

Now you have installed Tomcat 9 on Ubuntu 18.04, configured it, opened Firewall port. You can feel free to deploy your Java applications.

for user in $(cut -f1 -d: /etc/passwd); do echo id $user; crontab -u $user -l ; done