As of Gerrit 2.13.4, when setting up a new instance with mysql, be sure to set explicit_defaults_for_timestamp = true in your mysqld.cnf located at /etc/mysql/mysql.conf.d/ in Debian based distributions. Then to initialize gerrit we will need to add a service to systemd. Copy the script below to /etc/systemd/system and then to enable it we will use
$ sudo systemctl enable gerrit.service
$ sudo systemctl start gerrit.service