The system cannot check the kernel status: “/usr/bin/yum” reported error code “1” when it ended

Issue

The following errors occur:

The system cannot check the kernel status: 
"/usr/bin/yum" reported error code “1” when it ended: 
Error: Cannot open file "/var/cache/dnf/cloudlinux-x86_64-server-8-ec8365a17697c700/repodata/fc83645d800ccd374b605e376d74317b0286f67263b266eacf538ae954593f46-modules.yaml.gz": 
No such file or directory "/usr/bin/yum" reported error code "1" when it ended: 
Error: Cannot open file "/var/cache/dnf/cloudlinux-x86_64-server-8-ec8365a17697c700/repodata/fc83645d800ccd374b605e376d74317b0286f67263b266eacf538ae954593f46-modules.yaml.gz": 
No such file or directory 

Environment

• CloudLinux
• cPanel

Solution

1. Clean and re-create cache:

# yum clean all
# yum makecache

2. Run the update:

# yum update

NB! If the `yum update` transaction operates as expected, the server might be experiencing connectivity issues with our mirrors. We recommend contacting your datacenter for further investigation.

Cause

Related to the Spacewalk plugin. If the plugin is enabled, /scripts/maintenance will trigger security advisor warnings about not being able to check the kernel, and this doesn't happen with the plugin disabled.
 
CloudLinux still uses the plugin - for now, but not for much longer, as we are currently migrating away from it. Thus, it is safe to disable the Spacewalk plugin:

[root@damson ~]# grep enabled /etc/dnf/plugins/spacewalk.conf
enabled = 0
[root@damson ~]# grep enabled /etc/yum/pluginconf.d/spacewalk.conf
enabled = 0

Useful links

• https://support.cpanel.net/hc/en-us/articles/4404419242007-Security-Advisor-failed-to-run-with-unexpected-output