Firewalld is utility that allow us to manage firewall rules. It is is the default firewall on Centos. Install and starting firewalld. Some CentOS systems may not have firewalld. To install it, enter: For automatic start, enter: And to start
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Reset Root Superuser Password in Centos 7 or 8
Sometimes it happens that system administrators forget the superuser password or, for example, a server which there is no information. In these cases, we need to figure out what kind of server it is and what service is running on
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With the systemd subsystem came the systemctl command. It allows you to manage the main Linux processes. It is cheat sheet of the most used commands. General Syntax Without options, systemctl lists running services, mount points, devices, and other units.
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