Security

SELinux on RHEL without the fear: enforcing vs permissive vs disabled, how contexts and booleans work, and how to read a denial and fix it the right way.

Zones, services, and ports in firewall-cmd.

The difference between su and sudo.

Connecting and configuring the client and server sides.

Reading ls -l output without guessing.

Creating and modifying accounts with useradd, usermod, and passwd.

Using Red Hat Insights to catch and fix vulnerabilities across a RHEL fleet before they bite.

Sudo Show 35 taking apart the myth that open source is less secure.

Sudo Show 28 on security intelligence and attack-surface management.

Sudo Show 19 on the Sunburst attack and software supply-chain security.

We tend to associate free with good. That’s not the case though when what is free is unauthorized root-level access to your Linux systems! On January 26, 2021, a vulnerability, CVE-2021-3156, was…

Sudo Show 14 on CrowdSec and collaborative, open-source security.