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How to Configure a Linux Service to Auto-Start After a Reboot or System Crash: Part 1 (Practical Examples)

Introduction In computing, things don’t always go as planned. Oftentimes unexpected system crashes prompt system admins to initiate reboots and restart of individual services. Figuring out and restarting every service your application needs to run after a system crash or reboot can be tedious. In this first installment of the two-part tutorial, we will show you how to configure services …

Installing and Setting up Docker on CentOS 7

Introduction Docker is a platform that makes running and managing application processes in containers easier. It provides a way to separate your applications from your infrastructure. Containers are very similar to virtual machines, but they are more portable, efficient, and easy to use. There are various ways to install Docker on Linux distributions. The most popular and easy way to …

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Configuring the Linux Sudoers File

Introduction Do you ever wonder why you must type “sudo” while trying to execute certain commands in a Linux or Unix Operating System environment? Sudo is actually an abbreviation, standing for “super-user do”. When you use the sudo command, you can run programs and execute commands with the security privileges of another user. By default, the sudo command allows system …

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Setting Up a Firewall with FirewallD on CentOS 7

Introduction Firewalld is a firewall management solution that is available to many Linux distributions. It serves as an interface to the iptables packet filter system provided by the Linux kernel. In this guide, you will learn how to configure a firewall for your server. We will also show you the basics of managing the firewall with the firewall-cmd administration tool. …