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).
recently switched from a Windows server to a Linux server operating system. I am using Ubuntu LTS server. How do I find out disk space utilization information using command line option? [click to continue…]
very serious security problem has been found in the Linux kernel. A 0-day local privilege escalation vulnerability has existed since 2012. This bug affects millions of Android or Linux applications to escalate privileges. Any server or desktop (32 or 64 bit) with Linux Kernel version 3.8+ is vulnerable
. How do I fix this problem? [click to continue…]
he OpenSSH project released an ssh client bug info that can leak private keys to malicious servers. A man-in-the-middle kind of attack identified and fixed in OpenSSH are dubbed CVE-2016-0777 and CVE-2016-0778. How do I fix OpenSSH's client vulnerability on a Linux or Unix-like operating system? [click to continue…]
recently added NAT rules on my RHEL 6.x system. How do I see the rules including line numbers that I just added in Linux? [click to continue…]
ow do I identify the boot device or boot path in Linux operating system? [click to continue…]
s it possible to just backup my Linux partition table and restore it when required? How do I restore partition table if it get deleted by mistake on Linux operating system? How do I backup and restore a GPT partition table on Linux? [click to continue…]
s there a CPU-Z like a freeware/open source software that detects the central processing unit (CPU) of a modern personal computer in Linux operating system? How can I get detailed information about the CPU(s) gathered from the CPUID instruction, including the exact model of CPU(s) on Linux operating system? [click to continue…]
he Intel Advanced Encryption Standard (AES) or New Instructions (AES-NI) engine enables extremely fast hardware encryption and decryption for openssl, ssh, vpn, Linux/Unix/OSX full disk encryption and more. How do I check support for Intel or AMD AES-NI is loaded in my running Linux in my Linux based system including openssl? [click to continue…]
ow do I determine the system resource usage during of execution of a particular command on a Linux, OS X Unix, BSD and Unix-like operating system? [click to continue…]
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?
[click to continue…]