A proxy server is a device that usually sits between a client and the destination the user is trying to reach. It can provide security, anonymity, and...

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Apache is a solid and stable web server that has been around for years. Apache can also be used to host multiple websites at a single time through the...

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The VNC server allows you to remote into the user’s system and view her desktop. With the end user’s desktop in view, you can more easily troubleshoot...

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Secure your SSH connection is very important. I guess that you don’t want your password being hacked, right? There are some tips that can help you to...

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Backup your Linux OS is the first thing I want to do after installing my Linux machine and necessary softwares. You can install your OS again but it takes...

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Security Enhanced Linux (SELinux) is another layer of security for the Linux OS. Instead of turning it off, however, you could use SELinux in “permissive”...

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There are a few different ways you can manage the password policies on you syst...

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Network address translation (NAT) allows you to use a server as a gateway to a subnet, essentially controlling what goes in and out of your network. Suppose...

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Understanding the basics of Linux security is the best method to keep your business from outside or inside attacks.&nb...

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Kickstart server enables you to install Linux over the network via the HTTP, FTP, or NFS protocols. I choose to use the HTTP protocol here because it...

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Linux is truly just the kernel. Red Hat and the other distributions in existence today are software and configuration files packaged with the Linux kernel...

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Every time a program or command is run, a process is created for it. These processes are all unique and identified by the process identification (PID)...

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The Lightweight Directory Access Protocol (LDAP) is an application protocol for accessing and maintaining distributed directory information services over...

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Whenever something goes wrong – and sometimes when things go right – on the system, a message is generated by the syslog service. In all seriousness,...

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Group Collaboration is an essential part of any system administrator who deals with users. Knowing file and directory permissions will allow you to let...

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In Red Hat, there are three different types of user accounts: root, normal user and system. The root account is the equivalent of the Administrator or...

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TeamViewer connects to any PC or server around the world within a few seconds. You can remote control your partner's PC as if you were sitting right in...

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It’s common for system administrators to create their own repositories where they keep not only a copy of Red Hat (or CentOS) packages, but also their...

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A key skill for a system administrator is being able to deploy your own custom software. However, you first need to build an RPM package that contains...

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In Red Hat, the popular package used for installation usually have the .rpm extension and can be installed through different means. Before starting to...

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The key component to network troubleshooting is making sure that everything is working smoothly and that your network is functioning properly. There are...

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The benefit of this is that remote resources can be mounted automatically and without the need for the root user to perform the mount. This is done through...

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A disk quota is a limit set by a system administrator that restricts certain aspects of file system usage on modern operating systems. The function of...

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Linux, like most operating systems, has a standard set of file permissions. Aside from there, it also has more refined set of permissions implemented...

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Linux Unified Key Setup, or LUKs, is a disk encryption for Linux. LUKs uses block device encryption, which protects the system when it is off (particularly...

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I recently tried to convert CHM (Windows Help File) to PDF. There're many methods to achieve this. Now I give you an easiest way to make your PDF file...

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After setting up the layout of the different disks for the system. Now to be able to use these disks, we need to create a file system for each one, mount...

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Onion Proxy Server allows users of the Tor network to make anonymous outgoing connections via TCP. The key advantage that Tor has over other anonymity...

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The system uses swap space as type of “virtual memory” for when your physical memory begins to run low. It does this by using piece of disk storage to...

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On any system it is important to manage the running services. Managing services enables you to ensure the stability and reliability that your system will...

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When the system boots up, it queries for the default runlevel, which is defined in the /etc/inittab file. When that default runlevel is located, the system...

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