As Upstart matures, it is intended that its role will expand to the duties
currently handled by cron, anacron, the at command's daemon (atd), and
possibly (but much less likely) inetd.
Distributions in which Upstart is enabled by default:
Upstart was first included in Ubuntu in the 6.10 (Edgy Eft) release in late 2006,
replacing sysvinit. Ubuntu 9.10 (Karmic Koala) introduced native Upstart
bootup as of Alpha 6.
NixOS has been using Upstart as default from the beginning.
Upstart replaced the sysvinit in the Maemo 5 operating system for
Nokia Internet tablets.
Upstart is used in HP's webOS for the Palm Pre, Palm Pixi
(both before Palm was bought out by HP), HP Veer, and
HP Pre 3 smart phones, along with the HP TouchPad tablet.
Upstart is used in Google's Chrome OS.
Red Hat includes Upstart in their Red Hat Enterprise Linux 6 release.
As a result, it is also used by RHEL 6 variants such as Centos,
Scientific Linux, and Oracle Linux.
Upstart replaced sysvinit in Fedora 9, and functioned in the same manner
as it did in Ubuntu, i.e. it replaces sysvinit, while retaining the existing
scripts. However, Upstart has been replaced by
systemd in Fedora 15 release.
Debian considered switching for the Squeeze release.
openSUSE included upstart in version 11.3 Milestone 4,
but not as default. systemd replaced Upstart, as the
default init system in openSUSE 12.1.