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A server's firewall is managed by firewalld. The admin adds a rule to allow HTTPS traffic to the public zone, but clients still cannot connect. What is the most likely cause?
When a rule is added with the `--permanent` flag in firewalld, it is written to the configuration files but not applied to the runtime firewall. Until `firewall-cmd --reload` is executed, the runtime configuration remains unchanged, so the new rule allowing HTTPS traffic is not a…Read full explanation
A junior admin needs to ensure that the 'apache' user (UID 48) cannot log in via SSH or console. Which command achieves this?
Setting the user's login shell to `/sbin/nologin` prevents the user from obtaining an interactive shell via SSH or console login. When the user attempts to log in, the system executes `/sbin/nologin`, which prints a polite message and exits immediately, effectively denying shell …Read full explanation
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