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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 and applications can be run. It even support to run Linux GUI programs using an X Server. Developers can compile Linux binaries on WSL. Unlike …

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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 to get access of confidential resources like compute devices, network or database. It is helpful in case if one layer get compromised the attacker still …

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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 had launched the Red Hat Enterprise Linux 7 (RHEL 7) redefined operating system, it changed the paradigm of open source. Lot of changes have been …

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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 as you are getting segmentation fault error in output or in syslog log in Linux/Unix system as segfault example of error reporting in syslog log: …

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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 developers, startups, educational institutions, ISVs and enterprise organizations around the world, making it one of the industry’s most popular developer platforms to build any app, …

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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 gain.   So What is Terraform why it so much popular? Terraform is a one of the example of infrastructure as a code software developed …

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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 /etc/logrotate.conf To list out numbers of available dpkg.log files below is the command: ls -ltrh /var/log/dpkg.log* Below is the sample output of available dpkg.log files …

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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. Terraform one of the example of infrastructure as a code software developed by HashiCorp. It enable the user to build datacenter infrastructure with the help …

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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 communication between cluster nodes which make it capable of deploying High Availability in applications. Corosync is derived from an Open Source project OpenAIS under new …

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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 in Berkeley DB library error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recovery error: cannot open Packages index using db5 – (-30973) …

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