My Server Installation

Step 1: Install Java

sudo apt-get install default-jre
sudo apt-get install default-jdk

Step 2: Install apache 2
sudo apt-get install apache2

Step 3: Install OpenSSH (https://www.maketecheasier.com/setup-enable-ssh-ubuntu/)
sudo apt-get install openssh-server
sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.factory-defaults
sudo chmod a-w /etc/ssh/sshd_config.factory-defaults
sudo gedit /etc/ssh/sshd_config
sudo systemctl restart ssh
mkdir ~/.ssh
chmod 700 ~/.ssh
ssh-keygen -t rsa

Step 4: Install Tomcat
https://www.digitalocean.com/community/tutorials/how-to-install-apache-tomcat-8-on-ubuntu-16-04
sudo groupadd tomcat
sudo useradd -s /bin/false -g tomcat -d /opt/tomcat tomcat
cd /tmp
curl -O http://www-us.apache.org/dist/tomcat/tomcat-9/v9.0.6/bin/apache-tomcat-9.0.6.tar.gz
sudo mkdir /opt/tomcat
sudo tar xzvf apache-tomcat-9.0.6.tar.gz -C /opt/tomcat --strip-components=1
cd /opt/tomcat
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/
#sudo update-java-alternatives -l ----->find the Java Installation folder
sudo nano /etc/systemd/system/tomcat.service
### PASTE THE BLEOW TEXT IN THAT FILE
[Unit]
Description=Apache Tomcat Web Application Container
After=network.target

[Service]
Type=forking

Environment=JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre
Environment=CATALINA_PID=/opt/tomcat/temp/tomcat.pid
Environment=CATALINA_HOME=/opt/tomcat
Environment=CATALINA_BASE=/opt/tomcat
Environment='CATALINA_OPTS=-Xms1024M -Xmx2048M -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
### END

sudo systemctl daemon-reload
sudo systemctl start tomcat
sudo ufw allow 8080
sudo systemctl enable tomcat

sudo useradd -g tomcat ponraj
id ponraj

exit