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How to clone a KVM virtual Machines and reset the VM – Part 6
If you want to build several VMs with the same OS and configuration, “CLONE ” is the best method to save the time instead of installing operating system on each virtual machines. “virt-clone” is useful...
View ArticleLinux KVM – How to Add/Resize Virtual disk on fly? Part 7
In this article ,we will see that how to add new virtual disk or LUN to the KVM guest and how to resize the existing virtual disk on active domain/guest. This operations can be carried out on fly...
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Linux KVM – How to add /Remove Memory to Guest on Fly ? Part 8
If application/DB is demanding more Memory , you need to adjust the VM’s memory limit accordingly. KVM supports dynamic memory addition when you have configured the VM’s with Maximum memory limits....
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Linux KVM – How to add /Remove vCPU to Guest on fly ? Part 9
Does KVM support vCPU hot-plug ? Will Linux KVM guest can recognize the newly added vCPU’s ? The answer is “YES” off-course. Like KVM memory management, you can add/remove vCPU’s to active VM using...
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Linux KVM – Change libvirt VM image store path – Part 10
In KVM , VM images are stored in /var/lib/libvirt/images directory by default. There might be the space limitation since /var filesystem lives under root-vg. In KVM virtualization, everyone would...
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Perform Live Migration on Linux KVM – Part 11
In KVM , you can migrate the running virtual machines from one KVM host to another without any downtime. Live migration works well if both the KVM hosts have access to the same storage pool. To make...
View ArticleCompare Redhat Cluster Releases – RHEL 7 HA vs RHEL 6 HA
In this article ,we will see the difference between Redhat cluster 6.x (Red Hat Enterprise Linux High Availability Add-On Release 6) and Redhat Cluster 7.x releases (Red Hat Enterprise Linux High...
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RHEL 7 – Redhat Cluster with Pacemaker – Overview – Part 2
Pacemaker is robust and powerful opensource resource manager which is shipping with Redhat Enterprise Linux 7 as High Availability Add-on . Pacemaker simplified the cluster configuration and cluster...
View ArticleRHEL 7 – Installing Redhat Cluster Software (Corosync/pacemaker) – Part 3
In this article, we will see that how to install Redhat cluster software (Pacemaker) on RHEL 7. If you have valid redhat subscription , you can directly configure redhat repository and install the...
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RHEL 7 – Configuring Pacemaker/Corosync – Redhat Cluster – Part 4
In this article, we will see that how to configure two node Redhat cluster using pacemaker & corosync on REHL 7.2. Once you have installed the necessary packages, you need to enable the cluster...
View ArticleRHEL 7 – Pacemaker – Cluster Resource Agents Overview – Part 5
Resource agents plays an important role in cluster management. Resource agents are multi-threaded processes that provides the logic to manage the resources. Pacemaker has one agent per resource type....
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RHEL 7 – Pacemaker – Cluster Resources/Group Management – Part 6
In Pacemaker/Corosync cluster (RHEL 7 HA), resources management and resource group management are important tasks . Depends on the cluster HA services, you might need to configure N-number of...
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RHEL 7 – Pacemaker – Configuring HA KVM guest – Part 7
If you have followed the KVM article series in UnixArena , you might have read the article which talks about the KVM guest live migration. KVM supports the Guest Live migration (similar to VMware...
View ArticleRHEL 7 – Pacemaker – Cluster Node Management – Part 8
This article will demonstrates about the Pacemaker/Corosync cluster membership, node management and other cluster operational tasks. Periodically , you might need to take the cluster node offline to...
View ArticleRHEL 7 – Pacemaker – Define the Resource Behaviour – Part 9
In Pacemaker/Corosync cluster, there are may aspects/key elements that we need to understand before playing with cluster operations. Otherwise , it might cause unnecessary outage/downtime for the...
View ArticleRHEL 7 – Pacemaker – Configure Redundant Corosync Links on Fly– Part 10
Corosync cluster engine provides the reliable inter-cluster communications between the cluster nodes. It syncs the cluster configuration across the cluster nodes all the time. It also maintains the...
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RHEL 7 – Accessing the Pacemaker WEB UI (GUI) – Part 11
Pacemaker offers web based user interface portal to manage the cluster. It also provides an interface to manage multiple clusters in single web UI. We can’t really say that WEB UI has all the options...
View ArticleRHEL 7 – How to configure the Fencing on Pacemaker ?
Fencing (STONITH) is an important mechanism in cluster to avoid the data corruption on shared storage. It also helps to bring the cluster into the known state when there is a split brain occurs between...
View ArticleRHEL7 – Configuring GFS2 on Pacemaker/Corosync Cluster
This article will briefly explains about configuring the GFS2 filesystem between two cluster nodes. As you know that GFS2 is cluster filesystem and it can be mounted on more than one server at a time ....
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Puppet – Configuration Management Software – Overview
Puppet is an open-source configuration management / IT automation software that allows system administrators to programmatically provision, configure, and manage servers, network devices, and storage,...
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