#!/bin/bash

sudo apt-get update
sudo apt-get install default-jdk
sudo groupadd tomcat
sudo useradd -s /bin/false -g tomcat -d /opt/tomcat tomcat

wget http://www-eu.apache.org/dist/tomcat/tomcat-8/v8.5.20/bin/apache-tomcat-8.5.20.tar.gz
sudo tar -xzvf apache-tomcat-8.5.20.tar.gz
mv apache-tomcat-8.5.20 /opt/tomcat

sudo chgrp -R tomcat /opt/tomcat
sudo chown -R tomcat /opt/tomcat
sudo chmod -R 755 /opt/tomcat

cat > /etc/systemd/system/tomcat.service <<EOF
[Unit]
Description=Apache Tomcat Web Server
After=network.target

[Service]
Type=forking

Environment=JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64/jre
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=15
Restart=always

[Install]
WantedBy=multi-user.target
EOF

sudo systemctl daemon-reload
sudo systemctl start tomcat
sudo systemctl status tomcat