systemd unit service user vanilla tomcat

tomcat.service

# sudo cp tomcat.service /etc/systemd/system -i
# sudo nano /etc/systemd/system/tomcat.service
# sudo systemctl daemon-reload
# sudo systemctl enable tomcat
# sudo systemctl start tomcat
# systemctl status tomcat
# sudo systemctl restart tomcat

[Unit]
Description=tomcat
After=syslog.target network.target
Requires=network.target

[Service]
Environment="JAVA_HOME=/home/ubuntu/jdk8u192-b12-jre"

Environment="CATALINA_BASE=/home/ubuntu/apache-tomcat-8.5.24"
Environment="CATALINA_HOME=/home/ubuntu/apache-tomcat-8.5.24"
Environment="CATALINA_PID=/home/ubuntu/apache-tomcat-8.5.24/bin/catalina.pid"
# you can use setenv.sh instead
#Environment="CATALINA_OPTS=-Xms256m -Xmx512m -XX:PermSize=32m -XX:MaxPermSize=256m -Xss2m -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled"

# customize ports for multiple tomcat instances
#Environment="JAVA_OPTS=-Dhttp.port=8082 -Dhttps.port=8445 -Dajp.port=8011 -Dshutdown.port=8007"

Type=forking
User=ubuntu

PIDFile=/home/ubuntu/apache-tomcat-8.5.24/bin/catalina.pid
WorkingDirectory=/home/ubuntu/apache-tomcat-8.5.24
ExecStart=/home/ubuntu/apache-tomcat-8.5.24/bin/startup.sh
ExecStop=/home/ubuntu/apache-tomcat-8.5.24/bin/shutdown.sh
Restart=always
RestartSec=20

SuccessExitStatus=143

[Install]
WantedBy=multi-user.target