Chapter 10. Live migration
Chapter 10. Live migration 10.1. About live migration Live migration is the process of moving a running virtual machine (VM) to another node in the cluster without interrupting the virtual workload. By default, live migration traffic is encrypted using Transport Layer Security (TLS). 10.1.1. Live migration requirements Live migration has the following requirements: The cluster must have shared storage with ReadWriteMany (RWX) access mode. The cluster must have sufficient RAM and network bandwidth. Note You must ensure that there is enough memory request capacity in the cluster to support node drains that result in live migrations. You can determine the approximate required spare memory by using the following calculation: The default number of migrations that can run in parallel in the cluster is 5. If a VM uses a host model CPU, the nodes must support the CPU. Configuring a dedicated Multus network for live migration is highly recommended. A dedicated network minimizes the effects of network saturation on tenant workloads during migration. 10.1.2. Common live migration tasks You can perform the following live migration tasks: Configure live migration settings Initiate and cancel live migration Monitor the progress of all live migrations in the Migration tab of the OpenShift Virtualization web console. View VM migration metrics in the Metrics tab of the web console. 10.1.3. Additional resources Prometheus queries for live migration VM migration tuning VM run strategies VM and cluster eviction strategies 10.2. Configuring live migration You can configure live migration settings to ensure that the migration processes do not overwhelm the cluster. You can configure live migration policies to apply different migration configurations to groups of virtual machines (VMs). 10.2.1. Configuring live migration limits and timeouts Configure live migration limits and timeouts for the cluster by updating the HyperConverged custom resource (CR), which is located in the openshift-cnv namespace. Procedure Edit the HyperConverged CR and add the necessary live migration parameters: USD oc edit hyperconverged kubevirt-hyperconverged -n openshift-cnv Example configuration file apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: liveMigrationConfig: bandwidthPerMigration: 64Mi 1 completionTimeoutPerGiB: 800 2 parallelMigrationsPerCluster: 5 3 parallelOutboundMigrationsPerNode: 2 4 progressTimeout: 150 5 1 Bandwidth limit of each migration, where the value is the quantity of bytes per second. For example, a value of 2048Mi means 2048 MiB/s. Default: 0 , which is unlimited. 2 The migration is canceled if it has not completed in this time, in seconds per GiB of memory. For example, a VM with 6GiB memory times out if it has not completed migration in 4800 seconds. If the Migration Method is BlockMigration , the size of the migrating disks is included in the calculation. 3 Number of migrations running in parallel in the cluster. Default: 5 . 4 Maximum number of outbound migrations per node. Default: 2 . 5 The migration is canceled if memory copy fails to make progress in this time, in seconds. Default: 150 . Note You can restore the default value for any spec.liveMigrationConfig field by deleting that key/value pair and saving the file. For example, delete progressTimeout: <value> to restore the default progressTimeout: 150 . 10.2.2. Live migration policies You can create live migration policies to apply different migration configurations to groups of VMs that are defined by VM or project labels. Tip You can create live migration policies by using the OpenShift Virtualization web console. 10.2.2.1. Creating a live migration policy by using the command line You can create a live migration policy by using the command line. KubeVirt applies the live migration policy to selected virtual machines (VMs) by using any combination of labels: VM labels such as size , os , or gpu Project labels such as priority , bandwidth , or hpc-workload For the policy to apply to a specific group of VMs, all labels on the group of VMs must match the labels of the policy. Note If multiple live migration policies apply to a VM, the policy with the greatest number of matching labels takes precedence. If multiple policies meet this criteria, the policies are sorted by alphabetical order of the matching label keys, and the first one in that order takes precedence. Procedure Edit the VM object to which you want to apply a live migration policy, and add the corresponding VM labels. Open the YAML configuration of the resource: USD oc edit vm <vm_name> Adjust the required label values in the .spec.template.metadata.labels section of the configuration. For example, to mark the VM as a production VM for the purposes of migration policies, add the kubevirt.io/environment: production line: apiVersion: migrations.kubevirt.io/v1alpha1 kind: VirtualMachine metadata: name: <vm_name> namespace: default labels: app: my-app environment: production spec: template: metadata: labels: kubevirt.io/domain: <vm_name> kubevirt.io/size: large kubevirt.io/environment: production # ... Save and exit the configuration. Configure a MigrationPolicy object with the corresponding labels. The following example configures a policy that applies to all VMs that are labeled as production : apiVersion: migrations.kubevirt.io/v1alpha1 kind: MigrationPolicy metadata: name: <migration_policy> spec: selectors: namespaceSelector: 1 hpc-workloads: "True" xyz-workloads-type: "" virtualMachineInstanceSelector: 2 kubevirt.io/environment: "production" 1 Specify project labels. 2 Specify VM labels. Create the migration policy by running the following command: USD oc create -f <migration_policy>.yaml 10.2.3. Additional resources Configuring a dedicated Multus network for live migration 10.3. Initiating and canceling live migration You can initiate the live migration of a virtual machine (VM) to another node by using the OpenShift Container Platform web console or the command line . You can cancel a live migration by using the web console or the command line . The VM remains on its original node. Tip You can also initiate and cancel live migration by using the virtctl migrate <vm_name> and virtctl migrate-cancel <vm_name> commands. 10.3.1. Initiating live migration 10.3.1.1. Initiating live migration by using the web console You can live migrate a running virtual machine (VM) to a different node in the cluster by using the OpenShift Container Platform web console. Note The Migrate action is visible to all users but only cluster administrators can initiate a live migration. Prerequisites The VM must be migratable. If the VM is configured with a host model CPU, the cluster must have an available node that supports the CPU model. Procedure Navigate to Virtualization VirtualMachines in the web console. Select Migrate from the Options menu beside a VM. Click Migrate . 10.3.1.2. Initiating live migration by using the command line You can initiate the live migration of a running virtual machine (VM) by using the command line to create a VirtualMachineInstanceMigration object for the VM. Procedure Create a VirtualMachineInstanceMigration manifest for the VM that you want to migrate: apiVersion: kubevirt.io/v1 kind: VirtualMachineInstanceMigration metadata: name: <migration_name> spec: vmiName: <vm_name> Create the object by running the following command: USD oc create -f <migration_name>.yaml The VirtualMachineInstanceMigration object triggers a live migration of the VM. This object exists in the cluster for as long as the virtual machine instance is running, unless manually deleted. Verification Obtain the VM status by running the following command: USD oc describe vmi <vm_name> -n <namespace> Example output # ... Status: Conditions: Last Probe Time: <nil> Last Transition Time: <nil> Status: True Type: LiveMigratable Migration Method: LiveMigration Migration State: Completed: true End Timestamp: 2018-12-24T06:19:42Z Migration UID: d78c8962-0743-11e9-a540-fa163e0c69f1 Source Node: node2.example.com Start Timestamp: 2018-12-24T06:19:35Z Target Node: node1.example.com Target Node Address: 10.9.0.18:43891 Target Node Domain Detected: true 10.3.2. Canceling live migration 10.3.2.1. Canceling live migration by using the web console You can cancel the live migration of a virtual machine (VM) by using the OpenShift Container Platform web console. Procedure Navigate to Virtualization VirtualMachines in the web console. Select Cancel Migration on the Options menu beside a VM. 10.3.2.2. Canceling live migration by using the command line Cancel the live migration of a virtual machine by deleting the VirtualMachineInstanceMigration object associated with the migration. Procedure Delete the VirtualMachineInstanceMigration object that triggered the live migration, migration-job in this example: USD oc delete vmim migration-job
Product of (Maximum number of nodes that can drain in parallel) and (Highest total VM memory request allocations across nodes) oc edit hyperconverged kubevirt-hyperconverged -n openshift-cnv apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: liveMigrationConfig: bandwidthPerMigration: 64Mi 1 completionTimeoutPerGiB: 800 2 parallelMigrationsPerCluster: 5 3 parallelOutboundMigrationsPerNode: 2 4 progressTimeout: 150 5 oc edit vm <vm_name> apiVersion: migrations.kubevirt.io/v1alpha1 kind: VirtualMachine metadata: name: <vm_name> namespace: default labels: app: my-app environment: production spec: template: metadata: labels: kubevirt.io/domain: <vm_name> kubevirt.io/size: large kubevirt.io/environment: production apiVersion: migrations.kubevirt.io/v1alpha1 kind: MigrationPolicy metadata: name: <migration_policy> spec: selectors: namespaceSelector: 1 hpc-workloads: "True" xyz-workloads-type: "" virtualMachineInstanceSelector: 2 kubevirt.io/environment: "production" oc create -f <migration_policy>.yaml apiVersion: kubevirt.io/v1 kind: VirtualMachineInstanceMigration metadata: name: <migration_name> spec: vmiName: <vm_name> oc create -f <migration_name>.yaml oc describe vmi <vm_name> -n <namespace> Status: Conditions: Last Probe Time: <nil> Last Transition Time: <nil> Status: True Type: LiveMigratable Migration Method: LiveMigration Migration State: Completed: true End Timestamp: 2018-12-24T06:19:42Z Migration UID: d78c8962-0743-11e9-a540-fa163e0c69f1 Source Node: node2.example.com Start Timestamp: 2018-12-24T06:19:35Z Target Node: node1.example.com Target Node Address: 10.9.0.18:43891 Target Node Domain Detected: true oc delete vmim migration-job