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How to Migrate Virtual Machines using RHEV clusters

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RHEV Clustering

Add a new host to the RHEVM, before starting clustering and migration


To Install a new hypervisor (host)

To know how to setup a RedHat Enterprise Virtualisation Hypervisor visit,
https://www.linuxhelp.com/how-to-setup-redhat-enterprise-virtualization-hypervisor-in-linux/

After adding the host, approve the host in the rhevm.
RHEV-Clustering-Add-new-host-to-RHEVM-before-clustering-and-migration-Migrate-Virtual-Machines-using-Red-Hat-Enterprise-Virtualization-RHEV-Hypervisor-clusters-approve-host

Enter the Data Center, Host cluster, Name, address, port and click OK.
RHEV-Clustering-Add-new-host-to-RHEVM-before-clustering-and-migration-Migrate-Virtual-Machines-using-Red-Hat-Enterprise-Virtualization-RHEV-Hypervisor-clusters-Enter-Data-Center-Host-cluster
Select the cluster tab, edit the properties and then click OK.
RHEV-Clustering-Add-new-host-to-RHEVM-before-clustering-and-migration-Migrate-Virtual-Machines-using-Red-Hat-Enterprise-Virtualization-RHEV-Hypervisor-clusters-Select-cluster
Select the Host tab and configure the migration option. Then click OK
RHEV-Clustering-Add-new-host-to-RHEVM-before-clustering-and-migration-Migrate-Virtual-Machines-using-Red-Hat-Enterprise-Virtualization-RHEV-Hypervisor-clusters-Select-Host-configure-migration
Click High Availability tab and choose a priority for the Migration queue.
RHEV-Clustering-Add-new-host-to-RHEVM-before-clustering-and-migration-Migrate-Virtual-Machines-using-Red-Hat-Enterprise-Virtualization-RHEV-Hypervisor-clusters-High-Availability-priority-Migration-queue
Click migrate button for manual migration.
RHEV-Clustering-Add-new-host-to-RHEVM-before-clustering-and-migration-Migrate-Virtual-Machines-using-Red-Hat-Enterprise-Virtualization-RHEV-Hypervisor-clusters-manual-migration
Select the destination host to migrate the virtual machine.
RHEV-Clustering-Add-new-host-to-RHEVM-before-clustering-and-migration-Migrate-Virtual-Machines-using-Red-Hat-Enterprise-Virtualization-RHEV-Hypervisor-clusters-Select-destination-host


For Automatic migration

Make the CPU load of VM to exceed 60% for automatic migration by using the following command.

[root@vm :/home/user1] # dd if=/dev/urandom of=/dev/null

After running this command, the cpu load goes above 90%.
RHEV-Clustering-Add-new-host-to-RHEVM-before-clustering-and-migration-Migrate-Virtual-Machines-using-Red-Hat-Enterprise-Virtualization-RHEV-Hypervisor-clusters-automatic-migration
Now the host is getting migrated automatically to another host.
RHEV-Clustering-Add-new-host-to-RHEVM-before-clustering-and-migration-Migrate-Virtual-Machines-using-Red-Hat-Enterprise-Virtualization-RHEV-Hypervisor-clusters-host-getting-migrated
It has completely migrated to another host.
RHEV-Clustering-Add-new-host-to-RHEVM-before-clustering-and-migration-Migrate-Virtual-Machines-using-Red-Hat-Enterprise-Virtualization-RHEV-Hypervisor-clusters-completely-migrated-to-another-host

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Frequently asked questions ( 5 )

Q

Installation procedure for hypervisor ? please

A

Here we have provided the link for it,
https://www.linuxhelp.com/how-to-setup-redhat-enterprise-virtualization-hypervisor-in-linux/

Q

Check whether you have given qualified domain in the list first

A
Q

How do I move a VM from one cluster to another in RHEV?

A

Need to be able to move VMs around between clusters as neccessary

Q

What are different hypervisors available in Linux?

A

Xen & KVM are two hypervisors available in Linux.

Q

How to verify Virtualization Technology (VT) is enabled in your server’s BIOS or not ?

A

grep -E ‘svm|vmx’ /proc/cpuinfo

vmx is for Intel processors
svm is for AMD processors

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