Wednesday, February 19, 2020

How to Backup and Restore XFS filesystem in RHEL 8

To backup and restore an XFS filesystem it's possible by installing xfsdump package which provides xfsdump and xfsrestore commands.

How to Create a Thinly Provisioned Logical Volume on CentOS/RHEL/7/8

Thinly Provisioned Logical volume is one of the advanced feature available in Logical volume Management, We can provision storage more than what we have.

Migrating Logical Volumes in Logical Volume Management

Migrating Logical Volume by moving the extents from a PV to another PV when a faulty disk or the size of the disk need to be larger than the current one.

Striped Logical Volume in Logical volume management (LVM)

How to create Striped Logical Volumes in Logical Volume Management to get good I/O performance by balancing the data written to disks.

Shrink a Volume Group in Logical Volume Management (LVM2)

Shrink a Volume Group in logical volume management will be performed by sysadmins when the requirement in place to reduce the no of disks from a VG.

How to Extend and Reduce LVM Logical Volume in Linux

How to extend and reduce LVM logical volume management in Linux Operating Systems.

How to Setup iSCSI Target and Initiator on RHEL 7.x / RHEL 8

iSCSI Storage is a block-level storage solution shares the RAW disks over the network. iSCSI target will act as a server and iSCSI initiator will act as the client.

LINUX SECURITY

Migrate existing Iptables to Nftables in RHEL8/CentOS

Iptables can be migrated to nftables without spending time on writing it. Red Hat 8 based operating system provides translate tool to migrate the rules.

How to start using SELinux or Security-Enhanced Linux

SELinux is one of security layer in Linux which protect the directory, files, process and ports with its own labels by preventing unauthorised access.

Generate a CSR Certificate Signing Request in Linux

Generating a Certificate Signing Request (CSR) for Secure Sockets Layer (SSL) Certificate required when we need to sign with a Certificate Authority (CA).

LINUX OPERATING SYSTEMS

Step by Step Installing CentOS Linux 8 with Screenshots

CentOS Linux 8 is completely free to use and licensed under GNU GPL, It provides all features available in RHEL 8 and support available from the community.

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SYSTEM MANAGEMENT

Install FOG Imaging solution for Linux/Windows and Mac

Fog or "Free Open-Source Ghost" is an open source piece of cake used for imaging solution licensed under GPL.

How to install and register Linux clients with Spacewalk server 2.8

In earlier guides, the server-side setup has been completed. Currently, its time to set up with our client-side installation and configuration. Initially, we need...

How to create Software channels, Repositories, Activation keys and sync in Spacewalk Server 2.8

In our previous article, we have covered with installing and configuring the spacewalk server, by following in this guide we are about to walk...

How to install Spacewalk Linux systems management on RHEL and CentOS Linux 7

A spacewalk is an Open Source Linux System Management solution provided by RedHat under GPLv2 Licence with major features like Inventory and Provisioning.

LINUX AUTOMATION

Ansible tasks for Sysadmins with 25 examples

Ansible tasks are a set of actions, the number of tasks can be combined to form a playbook required for sysadmins in their daily routine operations.

Splunk forwarder installation using Ansible

(adsbygoogle = window.adsbygoogle || ).push({}); Splunk forwarder installation can be accomplished using Ansible. In...

Create a Logical volume using Ansible

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RunDeck IT automation tool step by step installation guide

RunDeck is an Open source server application to automate our daily IT tasks by replacing tools like Ansible, puppet, chef.

Ansible Playbook to create Users and Groups in Linux

Step by step creating with a user adding ansible playbook, Automating user account creation in Linux using Ansible playbooks made easy with Ansible.

LINUX INTERVIEWS

Linux Interview questions and answers for Level 1 role. Those who are looking to be an entry-level Linux admin and preparing for an interview look into it.
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TROUBLESHOOTING

How to fix Grub Rescue in CentOS and RHEL 7

A fix for boot issue (Grub rescue) will be carried out by sysadmins by following few steps. A brief guide on how to recover GRUB and UEFI based servers.

Your account are not allowed to access to crontab because of pam configuration.

(adsbygoogle = window.adsbygoogle || ).push({}); In today guide a simple solution for above topic...

The solution for “touch: cannot touch `test.txt’: No space left on device”

In this guide, we are about to provide a simple solution for the titled issue "No space left on device". In case we receive "No...

1 stop solution for setfacl “Operation not supported” in Linux

Introduction Setfacl error: We may come across this issue in a production environment while creating with the new file...

WEB SERVERS

Install and configure Apache Tomcat 8.5 on RHEL & CentOS7

Apache Tomcat is an open-source technology, which licensed under Apache License version 2. Basically to understand what the use of Tomcat it's a simple HTTP server used for Java Servlet, JavaServer Pages, Java Expression Language.

How to configure logging in Apache Web server

In this guide let us see how to log any required particular logs in Apache web server. To read about Apache related topic click on...

Understanding Apache Web Server logs

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Setup Apache Web Server on RHEL and CentOS7

(adsbygoogle = window.adsbygoogle || ).push({}); Introduction to Apache Web Server In...

RANDOM

Create a Pacemaker Cluster Resources and Resources group

Pacemaker Resources and groups are which need to be highly available across multiple nodes in a cluster to provide high-availability for any services.

Convert GPT to MBR layout in any Linux Drives

Here we can see how to change from GPT to MBR (Microsoft Master Boot Record), I need to format my pen drive while Installing...

Install Ansible using Python installation manager pip

(adsbygoogle = window.adsbygoogle || ).push({}); What is pip?pip can be called as preferred installer...
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LATEST ARTICLES

How to create a Linux Network Bridge on CentOS/RHEL7

Linux Network Bridge is a device that separates two or more network segments within one logical network and behaves like an L2 Switch but really it's not.

Migrate existing Iptables to Nftables in RHEL8/CentOS

Iptables can be migrated to nftables without spending time on writing it. Red Hat 8 based operating system provides translate tool to migrate the rules.

How to Configure a Network Interface on CentOS7 and RHEL7/8

Step by step guide to configure a network interface on Linux Operating Systems using command line tool nmcli. This guide applied for RHEL, CentOS & Oracle.

Rsync (Remote Sync) | 20 Rsync command with Examples in Linux

Rsync or Remote sync in Linux help to securely copy the files from any remote servers to a local server, It can be used as a poor mans Linux backup tool.

Migrating multi-writer VMware VM’s from Island cluster to vSAN cluster

Migrating Multi-writer disks of VMware VM's from Island Cluster to vSAN cluster with and without the downtime of Production.

Create a Pacemaker Cluster Resources and Resources group

Pacemaker Resources and groups are which need to be highly available across multiple nodes in a cluster to provide high-availability for any services.

How to add additional nodes to the Pacemaker Cluster

How to add additional nodes to the existing pacemaker Linux clusters. By adding nodes we can increase the resources of a cluster.

How to Manage Pacemaker Linux cluster from Web GUI

How to manage a Pacemaker Linux Cluster from web graphical interface (Pacemaker Web UI) by creating a new cluster or by adding an existing cluster.

Install and configure High Availability Linux Cluster with Pacemaker on CentOS 7.6

The Pacemaker is a high-availability cluster resource manager it will run on all the hosts which we suppose to use in the cluster to make sure our services up and running to reduce the downtime.

Migrating Logical Volumes in Logical Volume Management

Migrating Logical Volume by moving the extents from a PV to another PV when a faulty disk or the size of the disk need to be larger than the current one.

MOST POPULAR

How to Backup and Restore XFS filesystem in RHEL 8

To backup and restore an XFS filesystem it's possible by installing xfsdump package which provides xfsdump and xfsrestore commands.

Create Windows Server Image for OpenStack

Create a Cloud image for OpenStack environment for windows server in QCOW2 format. This solves the purposes of running windows instance in a cloud environment.

Offline installation of cx_oracle for Python 3.x

Offline installation guide of cx_oracle for Python 2.7 and 3.x. To fulfil the requirement to connect databases which are of 11g,12c,18c and 19c.

How to fix Grub Rescue in CentOS and RHEL 7

A fix for boot issue (Grub rescue) will be carried out by sysadmins by following few steps. A brief guide on how to recover GRUB and UEFI based servers.
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