All About YUM

up2date command was part of RHEL v4.x or older version. You need to use yum command to update...

 Bash Shell Generate Random Numbers

How do I create or generate random numbers (sequence of numbers that lack any pattern), under...

 CentOS / Redhat: Create Software RAID 1 Array

RAID devices are virtual devices created from two or more real block devices. Linux supports...

 CentOS / Redhat: Install KVM Virtualization Software

Required Packages You must install the following packages: kmod-kvm : kvm kernel module(s)...

 CentOS / Redhat: Install nginx As Reverse Proxy Load Balancer

nginx is a Web and Reverse proxy server. Nginx used in front of Apache Web servers. All...

 CentOS/RHEL Linux: Remove GDM

How do I uninstall a GUI Gnome login system ( GDM ) from my CentOS Linux v5.5 based server? GDM...

 Change Hostname / Reverse DNS (rDNS) / PTR

To change rDNS/PTR/hostname, please perform these steps: Login to the Clients Area; At the...

 Changing Default SSH port From 22

nano /etc/ssh/sshd_configLook for#Port 22Change "22" to the port you wish to use.CTRL + X, Save...

 Delete SSH Keys

Linux Lock An Account # passwd -l userName # passwd -l vivek FreeBSD Local An Account # pw...

 Force SSH Client To Use Given Private Key ( identity file )

 How Do I Block an IP Address on My Linux server?

How do I block an IP address or subnet under Linux operating system? In order to block an IP on...

 How do I Find Out Linux CPU Utilization?

Top command to find out Linux cpu usage Type the top command: $ top   Output:

 How do I find out System / Server Memory Utilization

free command example Type the free command at shell prompt: $ free $ free -m Output:...

 How to change the root Password using SSH

Changing your Root Password Using SSH This article will show you how to change the root...

 HowTo: Linux Install LibreOffice

            How do I install newly released LibreOffice...

 HowTo: Update Centos Linux 5.4 to 5.5

Step # 1: Make A Backup It cannot be stressed enough how important it is to make a backup of...

 HowTo: Verify My NTP Working Or Not

You can use any one of the following program to verify ntp client configuration: ntpq -...

 Iptables Limits Connections Per IP

How do I restrict the number of connections used by a single IP address to my server for port 80...

 iptables: Unknown error 18446744073709551615

When trying to run an OpenVPN Server and you receive the following error: iptables: Unknown...

 Linux / UNIX set the DNS from the command line

Check this link for more information...

 Linux / UNIX: Encrypt Backup Tape Using Tar & OpenSSL

  How do I make sure only authorized person access my backups stored on the tape drives...

 Linux Default Services Which Are Enabled at Boot

Can you provide a guidance on default CentOS / Fedora / RHEL / Redhat enterprise Linux services...

 Linux Install Google Chrome Browser [ Ubuntu, Suse, Debian, Fedora ]

How do I install Google Chrome browser under Linux operating systems? How do I install...

 Linux nginx: Chroot (Jail) Setup

You can use traditional chroot kind of setup with nginx. Our sample setup: Jail Directory :...

 Linux RAM Disk: Creating A Filesystem In RAM

Software RAM disks use the normal RAM in main memory as if it were a partition on a hard drive...

 Linux/UNIX: Configure OpenSSH To Listen On an IPv6 Address

How do I enable OpenSSH SSH server to listen on an IPv6 address under Linux or UNIX operating...

 Linux: Check For Memory Leaks In Programs

How do I check my C programs under Linux operating systems for memory leaks? How do I debug and...

 mod_setenv: Lighttpd Send Custom Headers

How do I add a header to the HTTP request that was received from the client under Lighttpd web...

 Nginx Block And Deny IP Address OR Network Subnets

How do I block or deny access based on the host name or IP address of the client visiting...

 Nginx Force (Redirect) WWW.Domain.COM To Domain.COM

I know how to force and redirect www.example.com to example.com under Lighttpd web server. How do...

 Nginx: Custom Error 403 Page Not Working with IP Deny Configuration

I block or deny access based on the host name or IP address of the client visiting website under...

 nginx: Send Custom HTTP Headers

How do I send or set arbitrary HTTP headers using nginx web server? You need to use add_header...

 nginx: Setup SSL Reverse Proxy (Load Balanced SSL Proxy)

everse proxy is a proxy server that is installed in a server network. Typically, reverse proxies...

 OpenSSH Hide Version Number From Clients

How do I hide ssh number from clients? When I type the following command it displays server...

 PHP Increase Upload File Size Limit

Your php installation putting limits on upload file size. The default will restrict you to a max...

 PHP Security: Limit Resources Used By Script

How do I control and put limits on php scripts such as maximum execution time of each script and...

 Setting up VPN for CentOS

First, You will need to open up a ticket with our support desk and ask for TUN/TAP to be enabled...

 SUSE Linux Restart / Stop / Start Network Service

Task: Start Network Service # /etc/init.d/network start # /etc/init.d/network start eth0 Task:...

 tcpdump: Monitor ALL eth1 Traffic Except My Own SSH Session

I'm using tcpdump to dump, debug and monitor traffic on a network. However, there is lots of...

 TightVNC Desktop

1. Installing the required packages   The server package is called 'vnc-server'. Run the...

 Used And Free Memory

What's going on? Linux is borrowing unused memory for disk caching. This makes it looks like you...

 Yum issues with low memory plans (Resolution)

If you are getting yum errors on our 128 or 192 yearly plans with the CentOS/Fedora distro then...

 yum update Linux Error: Missing Dependency: xen-libs

When I type "yum update" under RHEL 5.x server I get the following error: Error: Missing...

 yum update Linux Error: Missing Dependency: xen-libs

When I type "yum update" under RHEL 5.x server I get the following error: Error: Missing...