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 the storage pool accessible on both the KVM hosts, you need to use NFS or GFS2 filesystem(cluster filesystem). […]
Redhat Enterprise Virtualization
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 prefer to store VM images in central repository to migrate running VM from one hypervisor to another. In that case, you need to change the default path for the libvirt images […]
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 “virsh” command. But this works if you have configured the KVM guest with Maximum vCPUs parameter. So while deploying the new […]
Linux KVM – How to add /Remove Memory to Guest on Fly ? Part 8
If the 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. There are two parts to the VM configuration. 1. Maximum Limits 2. current allocation. At any point in time, you can’t exceed the maximum […]
Deploy KVM instance using Virt-Manger (VMM)- GUI – Part 5
Virt-Manager is powerful GUI tool to manage the multiple KVM hosts and it’s associated VM’s. It support’s XEN virtualization too. It can be installed on KVM hypervisor hosts or on centralized management host to manage the multiple hyper-visors from one place. Using virt-manager, you can start, pause(suspend), shutdown VMs, display VM details (Ex: VCPUs, memory, disk space), […]
Launch the first KVM instance using CLI – Part 4
Provisioning new VM’s (guests) using “virt-install” binary is straight forward. virt-install can be run in interactive or non-interactive mode. This command have more options but easy to remember since those are very meaningful. This article is going to demonstrate the VM creation using virt-install tool in non-interactive mode. You can also use GUI (VMM – […]
RHEL 7.2 – Configuring KVM hosts – Part 3
KVM hosts needs to be prepared to store and provide the network access to the guest machines. In last article ,we have seen KVM package installation and VMM(virtual Machine Manager) package installation. Once you have installed the packages, you need to create the filesystem to store the virtual machines images (/var/lib/libvirt/images which is the default storage […]
Kernel Based Virtual Machine (KVM) – Overview Part 1
KVM is free open source full virtualization solution for Linux on x86 hardware. After the cloud revolution, KVM(Kernel Based Virtual Machine) Virtualization is a hot topic in the industry. Most of the cloud technologies will prefer to use the KVM hypervisors over XEN due to it’s simplicity. Redhat and Ubuntu’s default hypervisor is KVM. Contrast to these vendors, Oracle Linux […]
How to add ISCSI Storage to RHEV ?
To store the virtual machines , you need centralized storage like SAN or NFS file server. Not everyone in world can afford the SAN cost since it requires lot hardwares like fiber channel cables, SFP connectors, SAN switches and Storage. But iSCSI storage can be easily setup using the existing system network with commodity hardware […]
How to create a Datacenter and Cluster on RHEV-M ?
Redhat Provides the wonderful administrative portal to manage the Redhat Enterprise virtualization environment. Redhat enterprise virtualization Manager is responsible to provide the administrative portal, user portal and reports portal. Its also manage the virtual objects and maintains the inventory on its own database. It performs the similar operations like VMware vCenter server or Oracle VM […]