Angelo
Angelo
I am Angelo. A systems engineer passionate about Linux and all open-source software. Although here I'm just another member of the family.

How to schedule system updates in CentOS 8 / RockyLinux 8 and keep the system secure

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Hello, friends. In this post, you will learn how to schedule system updates in CentOS / RockyLinux. Thanks to this, you will have an improved way to perform this system task.

Upgrading the operating system is a basic task to make it a little more secure and stable. Because this process installs the necessary updates to fix bugs and increase the reliability of the system.

Although it is a quick process to do, it can often be forgotten in the hustle and bustle of work and/or study. So we can always have some tools to help us automate the process.

If you use CentOS 7 / 8 or any distribution of the RHEL family you may notice that if you go many days without updating the system, it suggests you install dnf-cron or yum-cron according to the version of the system.

So, I will show you how to use these tools to schedule system updates.

Schedule system updates in CentOS / RockyLinux

Before using these tools we have to install them on the system. The command will depend on the version of RHEL we are using.

In the case of using RHEL 6 / 7 or CentOS 6 / 7, you have to open a terminal and run

sudo dnf install yum-cron

But if you are using RHEL 8 / CentOS 8 / RockyLinux 8 or any derivative of this family, you have to run

sudo dnf install dnf-automatic
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Then you have to configure it a little bit.

The configuration file for yum-cron is /etc/yum/yum-cron.conf and for dnf-automatic is /etc/dnf/automatic.conf.

According to your system, you have to edit one of the two files to make the proper configuration.

In those files, the apply_updates directive has to be assigned a value of yes to enable the update.

apply_updates = yes

If you want it to apply immediately then you have to change the value of random_sleep.

random_sleep = 0

Be careful with this value because as soon as you save the changes it will start the update process. So sometimes it is better to give another value.

Although you installed and set up yum-cron as root, the schedule doesn’t affect the root’s crontab. So be very careful when doing these updates.

Before closing the file you may want to configure the application to only apply security updates. I think this is the best thing to do because then we will be sure that the most important and secure updates will be applied.

To do this, just uncomment the minimal-security directive

minimal-security = dnf --security update-minimal

Save the changes and close the editor.

Conclusion

This utility allows us to automatically update the operating system. This will make that we can forget about this for a while and everything very secure.

More info in this link

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