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Dawn of Infrastructure as a Code a new method of Datacenter infrastructure management and provisioning.

Posted on September 24, 2018March 1, 2023 by Charanjit Cheema

Earlier in Datacenter Infrastructure were manage and provision through traditional way of physical hardware configuration or interactive configuration tool but now Infrastructure as a code has changed the picture of managing and provisioning the Infrastructure. Infrastructure as a code or IaC is the process of managing and provisioning computer data centers through machine-readable definition files….

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Simple way to configure Ngnix High Availability Web Server with Pacemaker and Corosync on CentOS7

Posted on September 4, 2018 by Charanjit Cheema

Pacemaker is an open source cluster manager software which provide high availability of resources or services in CentOS 7 or RHEL 7 Linux. It has feature of scalable and advanced HA Cluster Manager. This HA cluster manager distributed by ClusterLabs. Corosync is the core of Pacemaker Cluster Manager as it is responsible for generating heartbeat…

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How to recover “rpmdb open failed” error in RHEL or Centos Linux

Posted on August 30, 2018 by Charanjit Cheema

You are updating the system through yum command and suddenly power goes down or what happen if yum process is accidentally killed. Post this situation when you tried to update the system again with yum command now you are getting below error message related to rpmdb: error: rpmdb: BDB0113 Thread/process 2196/139984719730496 failed: BDB1507 Thread died…

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Docker and Containers New Buzzwords.

Posted on June 7, 2018 by Charanjit Cheema

Docker is a container management service. The Docker keyword coined in DevOps for develop, ship and run anywhere why it is so because it enable the developers to easily develop the applications, ship the application into containers and later it can be deployed anywhere. The Docker was released in March 2013 but has become buzzword…

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What is Cloud Object Storage?

Posted on May 25, 2018 by Charanjit Cheema

Cloud object storage stores unstructured data(like application images or media files) in the cloud.  Object storage is elastic, flexible and easily scalable into multiple petabytes which ideal for environment where data growth is unlimited hence it is considered a good fit for the cloud. Contrary to Block Storage which deal data as block and logical…

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What is OpenFlow? How it works in SDN?

Posted on May 18, 2018 by Charanjit Cheema

OpenFlow is a standard protocol of SDN which assist SDN Controller to communicate directly with the forwarding plane of network devices such as switches and routers, both physical and virtual (hypervisor-based), so it can better adapt to changing business requirements. Generally the conventional switches forwards the packets which are called the Forwarding Plane and do…

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What is SDN?

Posted on May 18, 2018 by Charanjit Cheema

SDN or Software-defined networking is a new technology which will soon replace the traditional Data Center networking architecture specially after introduction of Virtulization and Cloud. This term comprises of several kinds of network technologies which aimed at making the network as agile and flexible for virtualized server and storage infrastructure of the modern Data Center….

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Tcpdump – Linux Admin 12 useful commands.

Posted on May 11, 2018 by Charanjit Cheema

Tcpdump is a network sniffer tool. It is most powerful and widely used command line tool for Linux/Unix. It sniff or capture the TCP/IP traffic that receive or transfer over a network. tcpdump has an option to save captured packets in a file for future analysis. It can be save in a pcap format file, that can be…

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How to install and configure AWS CLI

Posted on April 27, 2018 by Charanjit Cheema

The AWS has launched AWS Command Line Interface (CLI) unified tool to manage your whole AWS services from the command line and automate them through scripts. You can install AWS CLI on your Linux or Windows machine for managing AWS services from command line. In this post I have demonstrated how to install and configure…

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Setting different kernel version in Ubuntu 16.04.4 as default.

Posted on April 8, 2018 by Charanjit Cheema

In Ubuntu we can set different installed kernel version as default so that during next boot time Ubuntu can boot from that default kernel version as per requirement. There can be many reason for setting different installed kernel version as default example: Ubuntu is unable to boot with current installed or upgraded kernel version. After…

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