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Clock buffers are having more strict rules.
If input signal is of 50% duty cycle. Then output will also be of 50%
We will give skew around 2 times of inverter delay. It should be less than clock period.
To fix IR drop, check whether the source VDD and VSS from IO pad is properly connected to IO ring so that it can supply enough power to ring.
In SOC encounter, you can define clock domain so that you can fix reg2reg, reg2out or in2reg paths seperately.
Due to incoming spamming to a domain in the server, server load was spiking
and also mail queue was flooded. I wanted to clear only mails to that particular domain.
A SYN flood is a form of denial-of-service attack in which an attacker sends a succession of SYN requests to a target's system.
How to change default language in Horde, SquirrelMail and Roundcube webmail
eg: To set default language as Spanish
Horde : /usr/local/cpanel/base/horde/config/nls.php
There are various archive file format exist, such as .tar.gz, .tgz, .tar.bz2, .gz, .bz2, .zip, .rar, .7z. The common questions regarding archives are “how to extract files from tar.gz?”, “how to create rar in Linux?” etc.
Therefore this overview aims to covers simple examples of archive tool usage for the common format such as:
tar, gzip, gunzip, bzip2, bunzip2, zip, unzip, rar, 7z.
In Linux, as in most other Unix-like operating systems, it is common to use a whole partition of a hard disk for swapping. However, with the 2.6 Linux kernel, swap files are just as fast[7] as swap partitions, although Red Hat recommends using a swap partition. The administrative flexibility of swap files outweighs that of partitions; since modern high capacity hard drives can remap physical sectors, no partition is guaranteed to be contiguous. You can add swap file as a dedicated partition or use following instructions to create a swap file.
This is a Tutorial of how to enable Google apps to work on your domain name. What I will be covering is how to ONLY setup EMAIL and NOT WEBHOSTING. Why NOT hosting? Because almost all of you have a descent site now and will not benefit from moving your website.
Configuring Apache for Multiple Servers on One Public IP
If you only have one public IP but run multiple web servers, you can set up the others on other port numbers. However giving out URL's like http://www.example.com:81 isn't exactly ideal. You're bound to have people trying to get to http://www.example.com, and since your port 80 points to another web server, the person will get the wrong web page.
It is very easy to view webalizer stats directly without logging into cPanel. You can follow the steps below to access webalizer stats using the URL http://domain.com/stats/.
How to install ClamAV and resolve installation issues
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When trying to install a new Gem using cPanel or from shell and gets this error:
uninitialized constant Gem::GemRunner (NameError)
Some times, we will get a strange error while using yum upgrade command:
===================
[root@s yum]# yum upgrade
Error: None
==================
I tried a lot for connecting evdo in linux. I successfully connected using ubuntu 8 with the steps given by Gopi Krishnan. Thanks boss for your nice article. I am pasting here the details so that anyone can refer it to connect to EVDO 
How to connect BSNL EVDO to linux:
- Install packages
Use yum to install Apache, mod_mono and the dependencies to xsp.
# yum install mod_mono mono-web httpd
The xm command is the main command line interface for managing Xen guest domains. The program can be used to create, pause, and shutdown domains. It can also be used to list current domains, enable or pin VCPUs, and attach or detach virtual block devices.
In a XEN VPS, IP tables was not working. The error we obtained is as follows:
======================
root:~# iptables -L
FATAL: Could not load /lib/modules/2.6.18-92.1.17.el5xen/modules.dep: No
such file or directory
iptables v1.3.8: can't initialize iptables table `filter': iptables who? (do
you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
==========================
When you try to a VPS using the command xm console , you may get the error:
xenconsole: Could not open tty `/dev/pts/2': No such file or directory
Create a new directory called /downloads and place the Qmailrocks tarball in that directory before unpacking it.
mkdir /downloads
cd /downloads
What is nagios??
nagios is free software is using for monitoring our service, your service is fine or have problem nagios will give a warning, if your service is back up nagios too give warning, nagios will sending warning by mail or plugin in your mozilla, nagios running in web base so nagios can running in all platform, in this posting nagios will be install in centos 5.2. Make sure your gcc-c++ package have installed, yum -y install gcc-c++
Cacti is free software was designed as making graphic network, cacti is advanced for graphic, with using RRDTool as data stored, multiple data, managed user, and monitoring server. For installation we need package php-snmp, rrdtool, et-snmp, net-snmp-utils, httpd, php, php-mysql, mysql, mysql-server. This step for processing installation on CentOS 5.2.
Please follow the steps given below to install zabbix agent in the vps where you need to add monitoring service.
Create Zabbix user.
useradd zabbix
CentOS does not come under the officially supported operating systems for FMS, one main reason why I thought I would document this. Below are the steps:
The steps for installing RED5 are as follows:
1. Install Java - JDK and JRE
yum intstall gcc
yum install gcc-c++
wget http://files.directadmin.com/services/custombuild/1.1/custombuild.tar.gz
login to your shell, i will be using ssh so i send this command:
wget http://prdownloads.sourceforge.net/webadmin/webmin-1.350-1.noarch.rpm
MRTG requires the following softwares to be installed in the server.
GD, libpng, perl, zlib, snmp
Nmap will help you to investigate simple network issues and for checking security issues.
nmap --help
I was using apache in my server and RAM is very less and I usually get errors like memory usage exceeded. So I was not able to install new applications or sites in the server. So I tried lighthttpd and the result was amazing. It is using less than 50% memory that apache uses and gives me good result. I am using the server for my own use. So I havent checked how to create user accounts and give it. I will explain here how to setup and configure lighttpd. First you need to install php, lighttpd and mysql.
Centova Cast is the world's most advanced Internet radio stream hosting control panel. Here I will explain how we can configure centova so that we can provide it to the users.
Today I would like to explain you the methods to setup video streaming software and a method to provide it to the customers. First of all we need to select a powerful and stable video streaming server application. I recommend Wowza media server even though it is not free. But it is quite stable and can handle large number of connections without any trouble.
Converting from ppt or pdf to images is very useful in webhosting industries especially in streaming area where we can use ppt presentations along with the video. As far as I know it is not possible to use ppt format directly in flash. So converting it to image is necessary. We can use this steps to convert ppt to pdf, ppt to images. First of all we need openoffice, imagemagick and jodconverter to achieve the same.
Lighttpd is a secure, fast, standards-compliant web server designed for speed-critical environments. I will explain how to install lighthttpd in a server. First we can start installing mysql in the server.
Memcached is a general-purpose distributed memory caching system. It is often used to speed up dynamic database-driven websites by caching data and objects in memory to reduce the number of times an external data source. Follow the steps given below to install memcached.
IEs4Linux create a Wine environment including Microsoft Internet Explorer running on Linux. IEs4Linux create a Wine environment that is separate to the default Wine configuration. Follow the steps given below to install IEs4linux.
Nagios is a well known monitoring system that have more functionlities and very simple and light wieght application. I have installed and tested in Centos. Here is how we can install nagios. First We need to configure nagios server. For that make sure that epel and rpmforge repos are enabled in the server.
After that install nagios core, nagios plugins and nagios nrpe.
OpenVZ is container-based virtualization for Linux. OpenVZ creates multiple secure, isolated containers (otherwise known as VEs or VPSs) on a single physical server enabling better server utilization and ensuring that applications do not conflict. Each container performs and executes exactly like a stand-alone server.I will explain you how to install openvz in centos server.
Network Information Services (NIS) can be used to login in all machines in a network if we create a user account in NIS server. NIS clients will check in the NIS server and login accordingly.To make it more effecient we install NFS so that we can use server space as home directory so that we can share home directory when we login from different machines.
Nowadays ssl certificate is the main requirement to authorise a site and make sure that transaction through that site is safe. If you dont have a ssl certificate installed, here is how we can create a ssl certificate. You can either use a self signed certificate which is free of cost or you can buy it from any authorised sites like godaddy. First of all you need to generate a key and a certificate signing request that need to be submitted to the authorised site to issue ssl certificate. To create RSA private key type the following in the command prompt.
Eclipse is a multi-language software development environment comprising an IDE and a plug-in system to extend it. It is written primarily in Java and can be used to develop applications in Java and, by means of the various plug-ins, in other languages as well, including C, C++, COBOL, Python, Perl, PHP, and others.This tutorial explains how you can install eclipse in linux with all required modules. First you need to download the PDT from eclipse site given below.
Evolution-Data Optimized or Evolution-Data only, abbreviated as EV-DO or EVDO and often EV, is a telecommunications standard for the wireless transmission of data through radio signals, typically for broadband Internet access. It uses multiplexing techniques including code division multiple access (CDMA) as well as time division multiple access (TDMA) to maximize both individual user's throughput and the overall system throughput. You can use same steps to configure EVDO in Ubuntu and Fedora.
FFmpeg is a command line tool that is composed of a collection of free software / open source libraries. It includes libavcodec, an audio/video codec library used by several other projects, and libavformat, an audio/video container mux and demux library. Useful ffmpeg Commands are given below. These are taken from man pages of ffmpeg. But I think this will help some one who is not familiar with linux.
Subversion is a very powerful tool that is widely used in development field. Using subversion, we can create a repository where a team can work very easily. Also It can be used to recover old datas and compare different version. Using subversion with eclipse make it as a useful tool for developer.
FFmpeg is a command line tool that is composed of a collection of free software / open source libraries. It includes libavcodec, an audio/video codec library used by several other projects, and libavformat, an audio/video container mux and demux library. If you want to setup server with ffmpeg, you can follow this steps. Add comments if you need any help. Best Of luck :)
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