CompTIA Updated XK0-005 Exam Questions and Answers by helen

Adding User=comptia in the [Service] section ensures that the web server runs as a non-root user, which enhances security by reducing the risk of elevated privileges being exploited. This follows the principle of least privilege, a best practice for system services.

The error indicates that the cron user does not have permission to run the cronjob. Creating a cron.allow file and adding the user cron to it will allow that user to run cronjobs. The cron.allow file is a security feature that controls which users are allowed to use cron.

The docker command is used to manage Docker containers, images, networks, volumes, and other resources on a Linux system. Docker is a platform that allows users to run applications in isolated environments called containers. Docker also provides networking features that allow users to create and manage networks for containers.

To delete all unused networks that are not referenced by any container, the cloud engineer can use the docker network prune command. This command will remove all networks that have no containers connected to them. The statement C is correct.

The statements A, B, and D are incorrect because they do not delete all unused networks. The docker network erase and docker network clear commands do not exist. The docker network rm command deletes a specific network by name or ID, but not all unused networks. References: [How to Manage Docker Networks]

rpm -qa lists all installed packages and filtering with perl will show if Perl is installed or not. This command is useful for verifying prerequisites like the presence of certain software on the system.