Linux Administration Cookbook

CentOS

On CentOS systems, we have a handy tool called yum-cron:

$ sudo yum install yum-cron -y

It comes with two configuration files, located in /etc/yum/.

By default, the /etc/yum/yum-cron.conf  file will be used, and it has a random sleep inside it that we are going to disable:

$ sudo sed -i "s/random_sleep = 360/random_sleep = 0/g" /etc/yum/yum-cron.conf

Now, this means that when yum-cron is called, it will automatically run, applying the default settings of yum-cron.conf:

$ sudo yum-cron $ 

If there are no updates, yum-cron will not show any output (as seen previously).

If there are updates, by default, you will get a notification that they have downloaded successfully:

If you wanted to apply the updates automatically, that would involve ...