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What is Windows subsystem for Linux?

Posted on December 19, 2018December 19, 2018 by Charanjit Cheema

Microsoft has added Windows Subsystem for Linux (WSL) from Microsoft Windows 10 version 1607 onward and Windows Server 2019 it has replaced the older Windows Services for Unix it is like WINE in Linux which provide compatible layer for running Windows based application on Linux likewise WSL provide a subsystem or layer on which different Linux distro…

5,676 total views, 3 views today

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To Activate the Virtual MFA device authentication for AWS console access.

Posted on December 14, 2018December 14, 2018 by Charanjit Cheema

Multi-Factor authentication (MFA) is an extra layer of security, it is a combination of more then one credentials which authenticates the user example combination of user password with security token (software or hardware based), using of biomatric verification for authenticating the user credentials. By adding extra layer in security it make difficult for unauthorised person…

13,030 total views, 4 views today

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Red Hat Enterprise Linux 8 Beta major features and improvement

Posted on December 10, 2018December 10, 2018 by Charanjit Cheema

Red Hat has launched the beta version of Red Hat Enterprise Linux 8 (RHEL 8) for users and developers for testing purpose and getting feedback from them. Red Hat Inc. which is developing RHEL 8 has announced this operating system beta version for public use on November 14, 2018. Four year ago when Red Hat…

8,067 total views, 2 views today

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Segmentation Fault error in Linux / Unix system

Posted on December 6, 2018December 6, 2018 by Charanjit Cheema

You were running a program installed in your Linux/Unix system and suddenly that program get stop and it log error in its logs memory segmentation fault error or you might executing a command in Linux / Unix server say you are working on LVM extension or VG scanning but you are unable to do so…

19,493 total views, 1 views today

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Red Hat OpenShift Online a Next generation Public Cloud PaaS.

Posted on November 30, 2018November 30, 2018 by Charanjit Cheema

By Launching of Red Hat OpenShift online in year 2011 Red Hat has revolutionize the Cloud platform as a service (PaaS) products since then. Red Hat OpenShift Online or RHOO gives platform to develop cloud-native application on PaaS to developers. It has hosted more than three million applications built by hundreds of thousands of individual…

6,326 total views, 2 views today

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Terraform – A new way of provisioning and managing Datacenter Infrastructure.

Posted on November 17, 2018December 6, 2018 by Charanjit Cheema

Terraform has become hot topic now days. In few years this tool has gain its popularity worldwide, many have adopted it as it has proven good progress which made this tool one of an essential tool of DevOps tool chain. Have a look the Google trend you will get picture how much popularity it has…

6,798 total views, 1 views today

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I have applied updates in my Ubuntu Linux machine how do I check what updates are applied?

Posted on October 1, 2018October 1, 2018 by Charanjit Cheema

Whenever you apply an install/update/remove any package or packages Ubuntu log the changes happened to packages in its default file /var/log/dpkg.log. If you do listing to /var/log/ path (below is the command) you may find numbers of uncompressed and compressed dpkg.log files it depends on what type of log rotate policy is configure in file…

6,847 total views, 2 views today

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Infrastructure as a Code a new face of Datacenter infrastructure management and provision.

Posted on September 24, 2018September 24, 2018 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….

6,208 total views, 1 views today

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

Posted on September 4, 2018October 1, 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…

42,622 total views, 48 views today

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

Posted on August 30, 2018January 26, 2020 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…

37,847 total views, 8 views today

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