Author: Bala

How to configure DNS server on Centos 7

Domain Name System(DNS) is a name resolution server. its basic function is translated (convert) the IP address into domain name or translated (convert) the domain name into IP address. it has a collection of domain names with mapped IP addresses...

Types of permission in Linux (Centos, Redhat, Ubuntu)

Linux having three type of permission as below, 1. Read permission 2. Write permission 3. Execute permission 1. Read Permission: Read permission give you the authority to open and read a file. Read permission on a directory gives you the...

How to configure the cisco router WAN and LAN interface with internet access

Network connection diagram of below configuration   Interface IP Configuration: Step: 1 Login into the router with global configuration mode

Step: 2 Here I’m going to configure WAN interface of the router with ISP public IP address. WAN IP          ...

Cisco IOS access levels and mode of command hierarchy

Cisco router’s and switch’s having two levels of access modes as below 1. User EXEC level This level allows you to access only basic monitoring commands. 2. Privileged EXEC level This level allows you to access all router commands. Privileged...

How to connect SSL VPN in Mackbook

SSL VPN  connection we can use through “Pulse secure” client application for MAC OS. Step: 1 First, we need download the Pulse secure .dmg package from below link Click here to download Pulse Secure Application package Step: 2 Double click...

How to install openstack in centos 7.4 with queen

Step 1: Update the Centos Repository yum update -y     Step 2: Disable and stop the firewall and selinux systemctl disable firewalld systemctl stop firewalld setenforce 0 Step: 4 Disable and stop the Network Manager and start the network service systemctl disable NetworkManager systemctl stop NetworkManager systemctl enable network systemctl start network Step: 5...

How to Install JDK 1.8 in ubuntu 14.04/16.04

Step 1: Add below PPA repository  into the source list sudo add-apt-repository ppa:jonathonf/openjdk Step 2: Update the ubuntu source repository sudo apt-get update Step 3: Install the Java run by below command sudo apt-get install openjdk-8-jdk

Server Monitoring script

This script can be used for monitoring the server like RAM, Server Load, OS Version, Server IP, Swap space while login in ssh terminal and display the server status. Step: 1 Copy the below codes into the script file Example...

Linux directory structure and details

Linux common directory structure of Centos/Ubuntu Use of directory’s /bin      1. contains user(Essential) command binaries (executable file) 2. Examples: /bin/top,/bin/mv,/bin/cut,/bin/cp,/bin/rename,/bin/mkdir,etc… /boot 1. contains  boot related file 2. Examples: grup, boot loader,kernel /dev    1. contains internal attached device ...