what is upstart
Upstart is an event-based replacement for the traditional init daemon â the method by which several Unix-like computer operating systems perform tasks when the computer is started. Red Hat includes Upstart in their Red Hat Enterprise Linux 6 release. 2  As a result, it is also used by RHEL 6 variants such as CentOS, Scientific Linux, and Oracle Linux. 3  For RHEL 7, systemd is used instead.