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I was researching how to keep a background process running and I came across daemonize. This answer says that I can use daemonize to ensure a process is always running: "Ensure a process is always running". I went thru the man page: http://software.clapper.org/daemonize/daemonize.html .

It only closes stdin, stdout, stderr, changing work directory to root, etc. It's doing all the things that a good background process should do.

The only thing I found related to restarting was -p pidfile for outputting the process id and -l lockfile for making sure only one process is started.

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If you don't want to use the tomcat package of your distribution, you can use systemd and define your own unit file such as:

# Systemd unit file for tomcat [Unit] Description=Apache Tomcat Web Application Container After=syslog.target network.target [Service] Type=forking Environment=JAVA_HOME=/usr/lib/jvm/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=/bin/kill -15 $MAINPID User=tomcat Group=tomcat UMask=0007 RestartSec=10 Restart=always [Install] WantedBy=multi-user.target

Read the tutorial How To Install Apache Tomcat 8 on CentOS 7 for full details.

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