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CentOS Howtos and Tutorials

Centos Linux tutorial for beginners and advanced users with special focus on security, firewall, web, mail, file and proxy servers in an enterprise environment (rss feed).

How To See Characteristics of File Systems on Linux or Unix

How do I display the characteristics of file systems such as inodes, blocks, block size, file system name, state, lifetime writes, fsck status and more on Linux or Unix-like operating system?
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How to Change a USER and GROUP ID on Linux For All Owned Files

I would like to know how to change a UID (USER ID)/GID (GROUP ID) and all belonging files on Linux operating system. Say, I want to change UID from 1005 to 2005 and GID from 1005 to 2005 on Linux. How do I make such change for belonging files and directories?
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How To Wakeup Backup Nas Server and Mirror Files Using Rsync in Linux

I've a critical data stored on my small home server. I backup my Desktop, Laptop and a remote VPS server to my home nas server powered by Debian Linux using rsnapshot backup utility. In the event that my main nas server has a hardware (hard disk failure) problem, having mirrored files provides some sort of peace of mind. How do I mirror /backups/personal (total 100GB and growing everyday) to a secondary nas Linux server located in my network?
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How to Set Locales (i18n) On a Linux or Unix

What is a "locale" on a Linux operating system? How do I set or get locals (i18n) values on a Linux operating system?
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How To SSH Run Multiple Command On Remote Machine And Exit Safely

I have a backup sync program on local server. I have an ssh password less login set up, and I can run commands on an external server in bash script doing:

ssh root@server2 "sync; sync; /sbin/shutdown -h now"

How do I run multiple commands in bash on a remote Unix or Linux server? What is the best Way to SSH in and Run various unix commands in bash?
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How To Install Speedtest-cli On a CentOS / RHEL / Scientific / Fedora Linux To Check Internet Speed

I do not want to use Adobe flash based speed testing site due to security concern on my desktop. How do I install Speedtest-cli on a CentOS Linux or Fedora Linux or Red Hat Enterise Linux (RHEL) for checking the Internet speed?
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How To Install ncurses Library on a Linux

I need to compile an application with ncurses library and header files. How do I install install ncurses libs and header files on a Linux operating system? How do I write a simple hello world program using the ncurses and compile it on a Linux?
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How To Install Google Chrome 45 On a RHEL/CentOS 7 and Fedora Linux 22 Using Yum Command

How do I installed the latest version of Google Chrome v45 on a Red Hat Enterprise Linux or CentOS Linux version 7.x and Fedora Linux v22 using the yum command line option?
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How To Join Several Partition Together To Form a Single Larger One On a Linux Using mhddfs

I've three old hard drives: sized 60, 60 and 120 GB. And 200 GB of video files, which I need to store on these drives. How would I store all my files on three hard drive without split a file into pieces or creating RAID array? How can I combines a several mount points (partitions) into the single one on a Linux operating systems?
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How to update Debian or Ubuntu Linux containers (lxc) VM

I'm using LXC (Linux Containers) a virtualization system running on a Ubuntu LTS. How can I update all my Ubuntu or Debian Linux based guests containers VM from host operating system?
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