Sarath Pillai's picture

How to install and configure ganglia gmod and ganglia gmetad

ganglia monitoring and graphing

Hi all...In the previous post Introduction to ganglia monitoring and graphing tool we had a look at how ganglia monitoring tool works. As mentioned in that post We require 2 seperate machines to test the installation(however you can test it using a single machine by making that machine installed with both gmond and gmetad and also serve it through apache and php in that same machine). In this example configuration we will be using 2 seperate machines.

Machine 1:


Installation: gmond

Operating System: Red Hat Enterprise Linux 5

Sarath Pillai's picture

Introduction to ganglia monitoring and graphing tool

how does ganglia work

Every system administrator needs to find some or the other way to monitor the servers that are under them. There are many number of tools available in the market such as nagios,hyperic etc.

If the task is to manage a few handful of machines then its not a big deal. But to have an overview of thousands of machines in the network and to have all the properties of all those machines arranged in a trending manner in one interface is a good solution to identify bottlenecks if any.

If a such a monitoring solution exist then it should address the following things.

slashmaster's picture

how to add an init script for nginx service

In the previous 3 documentation posts of nginx we learned how to install nginx,how is nginx different from apache,what all options are available while installing nginx.

If you install nginx using yum package manager, or by using rpm(by downloading and installing .rpm of nginx package), as mentioned in How to install nginx in rhel and centos, you do not require to add an init script to start,restart and stop the service.Because nginx when installed from a package manager adds the init script in the correct location where its required. So in that case you can start,stop,restart,reload etc using the service command, or by using /etc/init.d/nginx <options> command to do it.

Sarath Pillai's picture

options available while installing nginx

Nginx installation options

In the previous two posts about nginx.. how is nginx different from apache, How to install nginx in rhel and centos we have discussed the difference between apache and nginx, and also learned how to install nginx, with basic options and modules enabled.

But there are some advanced options which we need to understand to install nginx in a more efficient manner. We did have a look at the following options we supplied to the ./configure command.


Sarath Pillai's picture

Wget Command Usage and Examples

Download files using wget

We all have the habit of using download managers while downloading from internet in windows operating system. There are couple of nice Download managers available for windows as a graphical utility such as IDM,FDM etc. But if you are working in an environment where your primary interface is linux console without graphical X window, then what?

There are pretty good number of linux console based download managers. Our topic of interest in this post is one of them called WGET.

Wget is a wonderful tool to download files from internet. wget is a very old tool used by linux system admins for their tasks. Wget is something more than just a download manager...Lets understand some of its capabilities.

Sarath Pillai's picture

How to install nginx in rhel and centos

installing nginx

Hi the post how is nginx different from apache we discussed about the major factors which makes nginx different from apache.

In this post we will see how can we get the package nginx installed. We will be doing this installation tutorial in Red Hat Enterprise linux (configuring it in Centos is exactly the same.).

I will keep my post as simple as possible, please let me know about the shortcomings that you felt in this post. So lets start out tutorial.

Its recommended that you enable "epel" repo in your yum configuration files path inorder to install the nginx package through yum package manger.

Satish Tiwary's picture

How to create RAID on Loop Devices and LVM over top of RAID.

Before you go through this article, let me inform you that this is completely experimental.So read it, enjoy it,but use it in real environment at your own risk.I use to do so many experimental things in my Lab and this is just one of them.We have studied and know so much about Partitions,RAID and LVM.This time i am going to write something on the fact which comes out after relating all these things together. As you all know that once we have created LVM on top of RAID, it become so easy to add any other volume to RAID. Now instead of using a real device or real partition here we are going to use loop devices.Then after creating loop devices we will create RAID on loop devices.And after that we will create LVM over top of RAID.

Sarath Pillai's picture

how is nginx different from apache

difference between apache and nginx

Hi all in this post we will be discussing two webserver packages, one is apache which already has shown its ability to do multiple things, in a single package with the help of modules, and millions of websites in the internet is powered by apache platform. The other is the relatively new webserver package called Nginx made by Russian programmer Igor Sysoev.

Many people in the industry might be aware of the thing called “speed” for which nginx is famous for. There are some other important difference between apache and nginx's working model, we will be discussing, that differences in detail.

Sarath Pillai's picture

what is ntp and how to configure ntp server on rhel and centos

Network Time Protocol

In this post we will be discussing about one of the main dependency service, for many other services.

Network Time Protocol:

its a protocol used for synchronizing clock between machines, it works on the principle of Marzullo's algorithm. NTP protocol can maintain time accuracy in the range of 1 milliseconds, if configured correctly and is under ideal conditions.

Sarath Pillai's picture

how does DNS server work

dns working explained

introduction and history of dns name servers

Hi this post we will be discussing the most important and inevitable resource in the world of internet, which each and everyone of us uses knowingly or unknowingly.


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