February 25, 2021 / Nirav S
The yum-cron is used to install security packages automatically in Linux systems so This provides an automatic upgrade to any yum based Linux operating system.
It allows a user to configure a cron job for the yum package manager.
So for that, you have to follow the OS-specific commands as given below:
So, how can we use it?
So It provides a proper way to check for updates, and download, and it applies security updates automatically.
The cron jobs for yum-cron package are active immediately after installing the package and there’s no extra configuration necessary. And The job will be run when daily at the time the cron jobs are set to run.
To install the yum-cron package.
# yum -y install yum-cron # chkconfig yum-cron on
Config automatic security updates
# vi /etc/yum/yum-cron.conf
By default, this is set to default. Now edit and set the value to ‘security’.
update_cmd = security
We will be using the unattended update command below:
# yum --security upgrade
Next, change the value of update_messages from ‘no’ to ‘yes’.
update_cmd = security update_messages = yes download_updates = yes apply_updates = yes
Save and exit the config file.now start and enable the cron job,
#systemctl start yum-cron # systemctl enable yum-cron # systemctl status yum-cron
To exclude the packages follow below commands:
# vim /etc/yum/yum-cron.conf [base] exclude=kernel* mysql* php*
Restart the cron jobs and check the logs,
# systemctl restart yum-cron # systemctl status yum-cron # cat /var/log/yum.log | grep -i updated
Check the Automatic system updates that are controlled by a cron job service that runs daily and is stored in the /var/log/cron file.
# cat /var/log/cron | grep -i yum-daily
Now your redhat7 or CentOS 7 are fully configured for automatic security updates and there is no need for a manual method.
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