Fedora 21: automatic software updates

The way Fedora does automatic software updates has changed with the replacement of yum(8) with dnf(8).

Start by disabling yum's automatic updates, if installed:

# dnf remove yum-cron yum-cron-daily

Then install the dnf automatic update software:

# dnf install dnf-automatic

Alter /etc/dnf/automatic.conf to change the "apply_updates" line:

apply_updates = yes

Instruct systemd to run the updates periodically:

# systemctl enable dnf-automatic.timer
# systemctl start dnf-automatic.timer