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How to Install and Setup LXC Linux Containers on CentOS / RHEL / Ubuntu

LXC stands for Linux Containers. Linux containers are light-weight “virtualization” methods that runs multiple virtual units simultaneously on a single control host on a single Linux kernel. The Linux kernel contains cgroups for resource isolation (CPU, memory, block I/O, network, etc, ), which does not require starting any virtual machines. Cgroups also provides namespace isolation [...]


How to Create ZFS Filesystem with File Compression on Linux

ZFS filesystem is getting a wider recognition on Linux. In ZFS, you can enable compression at the filesystem level. This will store the data in compressed format, which will save lot of disk space. In this article, we’ll explain how to create the filesystem from the ZFS storage pool and enable compression on ZFS. This [...]

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How to Setup ZFS Filesystem on Linux with zpool Command Examples

ZFS has combined volume manager and filesystem with several advanced features. This is the first part in a series of articles on ZFS. In the article, we’ll provide an high level introduction to ZFS, explain how to install ZFS on linux, create a ZFS pool, and several ZFS zpool commands. 1. Introduction to ZFS The [...]


Introduction to Puppet Configuration files with Examples on Linux

Puppet is used to automate several routine sysadmin configuration tasks. Puppet in an enterprise grade configuration management system. It allows you to define the state of your IT infrastructure. Once it is defined, Puppet will automatically enforce the correct state on an on-going basis. 1. Puppet Architecture Puppet typically has one server component and multiple [...]


20 Zypper Command Examples to Manage Packages on SUSE Linux

yum is for CentOS and Redhat. apt-get is for Debian and Ubuntu. In the same way, zypper is for SUSE Linux. Zypper is a command line tool for package management in OpenSUSE and SUSE Enterprise Linux platforms. On a high-level, you can manage two different things using zypper command: Manage Packages: Zypper is used to [...]


How to Sync and Start Redhat Cluster to Verify Failover Scenario

In the first part, we explained in detail on how to install and configure 2 Node RedHat Cluster. We covered the following high-level steps in the previous tutorial: Install and start RICCI cluster service Create cluster on active node Add a node to cluster Add fencing to cluster Configure failover domain Add resources to cluster [...]


How to Configure Linux Cluster with 2 Nodes on RedHat and CentOS

In an active-standby Linux cluster configuration, all the critical services including IP, filesystem will failover from one node to another node in the cluster. This tutorials explains in detail on how to create and configure two node redhat cluster using command line utilities. The following are the high-level steps involved in configuring Linux cluster on [...]


How to Add Memory, vCPU, Hard Disk to Linux KVM Virtual Machine

In our previous article of Linux KVM series, we explained how to Install Linux KVM and create a Guest VM. But, once you’ve created a Guest VM, you need to know how to perform some of the routine maintenance activities on the VM. This tutorial will explain how to perform the following Linux KVM VM [...]