HowTo: Upgrade CentOS Linux 6.4/6.3/6.2/6.1/6.0 to v6.5

C entOS Linux v6.5 has been released and available via repos for immediate update. The new version includes several hundred bug fixes for, and enhancements to the Linux kernel. How do I upgrade from CentOS…

Mac OS X: Install Go Programming Language

H ow do I install Go language on Apple Mac OS X? How to setup GO lanuage on Mac OS X? How do I install Go language version 1.2+ on OS X?   Go or…

Nginx: Allow All But Block Certain POST Request URLS For Selected Spammer IP Address/CIDR

I am a small business and ecom site owner. I also run a WordPress based blog to connect with my customers. However, I get too much spam from certain IPs and net-blocks. How do I…

Mac OS X Sierra Install wget Network Downloader Utility

I recently learned that “wget” can continue getting a partially-downloaded (resume download) file. I am unable to find wget command on Mac OS X. How do I install install wget on Mac OS X (Mountain…

HowTo: Enable Nginx Status Page

A pache has status page that can provide data about Apache. How do I enable and display such page using nginx server? How do I enable nginx status page on Linux or Unix-like operating systems?…

Linux: Keep An Eye On Your System With Glances Monitor

I s there is a tool that can provide me a maximum of information (such as cpu, disk I/O, network, nfsd, memory and more) about my Linux/Unix server in a minimum of space in a…

Nginx: Redirect Backend Traffic Based Upon Client IP Address

I have four Apache backend servers in front of nginx reverse proxy server. How do I make sure nginx reverse proxy load balancer always send specific client IP address (say IP 1.2.3.4) request to http://apachereadwrite/…

Linux / Unix: whereis Command Examples

I am a new Linux and Unix-like system command line user. How do I find and locate the binary, source, and manual page files for a given command?   You need to use the whereiscommand…

Linux / Unix: Check Last Time User Logged In On The System

I am a new Unix system admin. How do I find ouw who has recently use the Linux or Unix-like server? Which terminals they used, and when they logged in and out of the my…

HowTo: Prevent Yum From Upgrading The Kernel On a CentOS / Red Hat Enterprise Linux

I am a new RHEL / Centos Linux server admin. I would like yum to update all packages except the Linux Kernel. How can I prevent yum command from updating kernel on a CentOS/RHEL/Fedora Linux…