how to setup Kubernetes cluster on servers running on CentOS 7 (Bare-metal installation) as well as deploy add-on services such as DNS and Kubernetes Dashboard.

Prerequisites:You need at least 2 servers for setting Kubernetes cluster. For this blog, we are using three servers to form Kubernetes cluster. Make sure that each of these servers has at least 1 core and 2 GB memory.

Master   172.16.106.140
Node1/Minion1 172.16.106.141
Node2/Minion2 172.16.106.142

Cacti tool is an open source web based network monitoring and system monitoring graphing solution for IT business. Cacti enables a user to poll services at regular intervals to create graphs on resulting data using RRDtool. Generally, it is used to graph time-series data of metrics such as network bandwidth utilization, CPU load, running processes, disk space etc.

In this how-to we are going to show you how to install and setup complete network monitoring application called Cacti using Net-SNMP tool on RHEL 6.x and CentOS 6.xsystems using YUM  package manager tool.

Cacti Required Packages

The Cacti required following packages to be installed on your Linux operating systems like RHEL / CentOS

1. Apache : A Web server to display network graphs created by PHP and RRDTool.
2. MySQL : A Database server to store cacti information.
3. PHP : A script module to create graphs using RRDTool.
4. PHP-SNMP : A PHP extension for SNMP to access data.
5. NET-SNMP : A SNMP (Simple Network Management Protocol) is used to manage network.
6. RRDTool : A database tool to manage and retrieve time series data like CPU load, Network Bandwidth etc.

Installation
yum install telnet telnet-server -y
vi /etc/xinetd.d/telnet

Set disable = no:

# default: on
# description: The telnet server serves telnet sessions; it uses \
#       unencrypted username/password pairs for authentication.
service telnet

This is a clash of virtualization titans: one virtual machine, the other a containerization technology. In reality, both are complementary technologies—as hardware virtualization and containerization each have their distinct qualities and can be used in tandem for combinatorial benefits. Let’s take a look at each to find out how they stack up against each other, as well as how the two can be used in tandem for achieving maximum agility.