Operation and Maintenance
Linux Operation and Maintenance
How to use `yum-cron` for automatic updates yum dnf
How to use `yum-cron` for automatic updates yum dnf
Sep 13, 2025 am 03:09 AM
Automatic update of system patches and software packages is an important part of maintaining the security of Linux servers. If you are using a RHEL-based system, such as CentOS or Rocky Linux, yum-cron is a simple and effective tool to achieve this goal.
Below are some practical suggestions to help you use yum-cron to complete the automatic update task.
Configuration file location and basic settings
The configuration files for yum-cron are usually located in /etc/yum/yum-cron.conf and /etc/yum/yum-cron-hourly.conf (if you enable hourly checks). The former is used for daily daily update tasks, while the latter is used for more frequent checks.
The main configuration items include:
-
update_cmd: Specify the update method, which can bedefault,security, orminimal, etc. -
update_packages: Optional, specifying that only certain specific packages are updated -
download_updatesandapply_updates: Controls whether to automatically download and install updates -
system_name: Set the host name to display when mail notifications
Remember to restart the service after modifying the configuration:
sudo systemctl restart yum-cron
Enable and run the yum-cron service
In most modern systems, yum-cron runs as a systemd service. You can enable and start it with the following command:
Enable Power-on:
sudo systemctl enable yum-cron
Start the service:
sudo systemctl start yum-cron
If you want the system to check for updates more actively, you can enable yum-cron-hourly service:
sudo systemctl enable yum-cron-hourly sudo systemctl start yum-cron-hourly
Note: These two services may run at the same time. It is recommended to choose one according to your needs to avoid repeated operations.
Compatibility issues under DNF system
Starting from RHEL 8, the default package manager has been replaced with dnf , but yum-cron has actually been transformed into a version that uses dnf command. That is to say, in newer systems you can still use yum-cron , which calls dnf behind it.
But be aware of:
- The installation package name may be different, for example, in some distributions it is
dnf-automatic - The configuration file path may be slightly different, and some systems will place the configuration in the
/etc/dnf/directory - If you encounter compatibility issues, you can consider using
dnf-automaticdirectly as a substitute
Log viewing and email notification settings
To ensure that the update is going on properly, you should check the logs regularly. By default, yum-cron will write output to the system's log, usually /var/log/messages or viewed through journalctl :
journalctl -u yum-cron
If you want to receive email notifications, you can set it in the configuration file:
-
email_to: email address to receive notifications -
email_from: sender address -
emit_via: Selectemailorstdioto decide whether to send it via email
In addition, make sure that the system has available mail transfer agents (such as sendmail or ssmtp ) configured.
Basically that's it. As long as the configuration is properly, yum-cron can silently ensure the system security without disturbing you. The key is to check the log regularly to confirm that there are no omissions or failures.
The above is the detailed content of How to use `yum-cron` for automatic updates yum dnf. For more information, please follow other related articles on the PHP Chinese website!
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