If the hosts have different generations of CPU models, they use only the features present in all models. Each cluster in the system must belong to a data center, and each host in the system must belong to a cluster. Virtual machines are dynamically allocated to any host in a cluster and can be migrated between them, according to policies defined on the cluster and settings on the virtual machines.
The cluster is the highest level at which power and load-sharing policies can be defined. The number of hosts and number of virtual machines that belong to a cluster are displayed in the results list under Host Count and VM Countrespectively. Clusters run virtual machines or Gluster Storage Servers.
These two purposes are mutually exclusive: A single cluster cannot support virtualization and storage hosts together. A data center can contain multiple clusters, and a cluster can contain multiple hosts.
It is recommended that you create your hosts before you create your cluster to ensure CPU type optimization. However, you can configure the hosts at a later time using the Guide Me button. Select a network from the Management Network drop-down list to assign the management network role. It is important to match the CPU processor family with the minimum CPU processor type of the hosts you intend to attach to the cluster, otherwise the host will be non-operational.
Select the Firewall Type for hosts in the cluster, either iptables or firewalld. Select either the Enable Virt Service or Enable Gluster Service radio button to define whether the cluster will be populated with virtual machine hosts or with Gluster-enabled nodes.
Optionally select the Enable to set VM maintenance reason check box to enable an optional reason field when a virtual machine is shut down from the Manager, allowing the administrator to provide an explanation for the maintenance.
Optionally select the Enable to set Host maintenance reason check box to enable an optional reason field when a host is placed into maintenance mode from the Manager, allowing the administrator to provide an explanation for the maintenance. Click the Optimization tab to select the memory page sharing threshold for the cluster, and optionally enable CPU thread handling and memory ballooning on the hosts in the cluster. Click the Migration Policy tab to define the virtual machine migration policy for the cluster.
Click the Scheduling Policy tab to optionally configure a scheduling policy, configure scheduler optimization settings, enable trusted service for hosts in the cluster, enable HA Reservation, and add a custom serial number policy. Click the Fencing policy tab to enable or disable fencing in the cluster, and select fencing options. The Guide Me window lists the entities that need to be configured for the cluster. The table below describes the settings for the General tab in the New Cluster and Edit Cluster windows.
Invalid entries are outlined in orange when you click OKprohibiting the changes being accepted.It allows centralized management of virtual machinescompute, storage and networking resources, from an easy-to-use web-based front-end with platform independent access.
KVM on x and PowerPC64   architecture are the only hypervisors supported, but there is an ongoing effort to support ARM architecture in the future releases.
The frontend can be accessed through a webadmin portal for administration, or a user portal with privileges, and features that can be fine tuned. Data warehousing and reporting capabilities depend on additional history and reports databases that can be optionally instantiated during the setup procedure. Management of resources initiated from a webadmin portal are sent through the engine backend that issues appropriate calls to the VDSM daemon. VDSM controls all resources available to the node compute, storage, networking and virtual machines running on it and is also responsible for providing feedback to the engine about all initiated operations.
Multiple nodes can be clustered from the oVirt engine webadmin portal to enhance RAS. The oVirt engine can be installed on a standalone server, or can be hosted on a cluster of nodes themselves inside a virtual machine self-hosted engine. The self-hosted engine can be manually installed or automatically deployed via a virtual appliance. Virtual datacentersmanaged by oVirt, are categorized into storage, networking and clusters that consist of one or more oVirt nodes.
Data integrity is ensured by fencingwith agents that can use various resources such as baseboard management controllers or uninterruptible power supplies. Storage is organized within entities called storage domains and can be local or shared. Storage domains can be created using the following storage solutions or protocols:. Network management allows defining multiple VLANs that can be bridged to the network interfaces available on the nodes.
Configuration of bonded interfaces, IP addressessubnet masks and gateways on managed nodes are all supported within webadmin portal interface, as is SR-IOV on hardware configurations that support this feature. Virtual machine management enables selecting high availability priority, live migrationlive snapshotscloning virtual machines from snapshots, creating virtual machine templates, using cloud-init for automated configuration during provisioning and deployment of virtual machines.
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Chapter 2: Dashboard
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If you notice any issues in this documentation, you can edit this document to improve it. Ansible 2. A boolean flag indicating if Kerberos authentication should be used instead of the default basic authentication. If True enable memory balloon optimization. The compatibility version of the cluster. All hosts in this cluster must support at least this compatibility version.
List of references to the external network providers available in the cluster. If the automatic deployment of the external network provider is supported, the networks of the referenced network provider are available on every host in the cluster.
Name of the external network provider. Either name or id is required. If True fencing will be temporarily disabled if the percentage of hosts in the cluster that are experiencing connectivity issues is greater than or equal to the defined threshold.
A flag indicating if fencing should be skipped if Gluster bricks are up and running in the host being fenced. A flag indicating if fencing should be skipped if Gluster bricks are up and running and Gluster quorum will not be met without those bricks.
If True any hosts in the cluster that are Non Responsive and still connected to storage will not be fenced. It will fetch IDs of the VMs disks, snapshots, etc. Up to version 4. Since version 4. For clusters with a compatibility version of 4. If Truehosts in this cluster will be used as Gluster Storage server nodes, and not for running virtual machines. This is not mandatory and relevant only for clusters with Gluster service. Could be for example virtual-hostrhgs-sequential-iorhgs-random-io. If True enables an optional reason field when a host is placed into maintenance mode from the Manager, allowing the administrator to provide an explanation for the maintenance.
The bandwidth settings define the maximum bandwidth of both outgoing and incoming migrations per host. A migration policy defines the conditions for live migrating virtual machines in the event of host failure. If the VM migration is not converging for a long time, the migration will be switched to post-copy. Added in version 2. Type of switch to be used by all networks in given cluster. Either legacy which is using linux bridge or ovs using Open vSwitch.
If True the exposed host threads would be treated as cores which can be utilized by virtual machines. The amount of time in seconds the module should wait for the instance to get into desired state. If True enables an optional reason field when a virtual machine is shut down from the Manager, allowing the administrator to provide an explanation for the maintenance.This summary can alert the user to a problem and allows them to analyze the problem area.
How to Create Virtual Machines (VMs) in oVirt 4.0 Environment
The information in the dashboard is updated every 15 minutes by default from the Data Warehouse, and every 15 seconds by default by the Engine API, or whenever the Dashboard is refreshed. The Dashboard is refreshed when the user changes back from another tab or when manually refreshed. The Dashboard does not automatically refresh. The inventory card information is supplied by the Engine API and the utilization information is supplied by the Data Warehouse.
The Dashboard is implemented as a UI plugin component, which is automatically installed and upgraded alongside the Engine. The Dashboard requires that the Data Warehouse is installed and configured. The top section of the Dashboard provides a global inventory of the oVirt resources and includes items for data centers, clusters, hosts, storage domains, virtual machines, and events.
Icons show the status of each resource and numbers show the quantity of the each resource with that status. The title shows the number of a type of resource and their status is displayed below the title. Clicking on the resource title navigates to the related tab in the oVirt Engine. Shows the number of a resource with a warning status.
Clicking on the icon navigates to the appropriate tab with the search limited to that resource with a warning status. The search is limited differently for each resource:. Shows the number of a resource with a down status. Clicking on the icon navigates to the appropriate tab with the search limited to resources with a down status. The top section shows the percentage of the available CPU, memory or storage and the over commit ratio.
For example, the over commit ratio for the CPU is calculated by dividing the number of virtual cores by the number of physical cores that are available for the running virtual machines based on the latest data in the Data Warehouse.Building my lab: oVirt 4.3 cluster upgrade
The donut displays the usage in percentage for the CPU, memory or storage and shows the average usage for all hosts based on the average usage in the last 5 minutes.
Hovering over a section of the donut will display the value of the selected section. The line graph at the bottom displays the trend in the last 24 hours. Each data point shows the average usage for a specific hour. Hovering over a point on the graph displays the time and the percentage used for the CPU graph and the amount of usage for the memory and storage graphs.
Clicking the donut in the global utilization section of the Dashboard will display a list of the top utilized resources for the CPU, memory or storage. For CPU and memory the pop-up shows a list of the ten hosts and virtual machines with the highest usage.
For storage the pop-up shows a list of the top ten utilized storage domains and virtual machines.
The arrow to the right of the usage bar shows the trend of usage for that resource in the last minute. The heatmap of the CPU utilization for a specific cluster that shows the average utilization of the CPU for the last 24 hours.
Hovering over the heatmap displays the cluster name.
GlusterFS Storage Domain
This is calculated by using the average host CPU utilization for each host over the last 24 hours to find the total average usage of the CPU by the cluster. The heatmap of the memory utilization for a specific cluster that shows the average utilization of the memory for the last 24 hours.
The formula used to calculate the memory usage by the cluster is the total utilization of the memory in the cluster in GB. This is calculated by using the average host memory utilization for each host over the last 24 hours to find the total average usage of memory by the cluster.
The heatmap shows the average utilization of the storage for the last 24 hours. The formula used to calculate the storage usage by the cluster is the total utilization of the storage in the cluster. This is calculated by using the average storage utilization for each host over the last 24 hours to find the total average usage of the storage by the cluster. Hovering over the heatmap displays the storage domain name. Adapted from RHV 4.Hosted engine has seen a lot of progress and evolution, and today it is is the de facto recommended way to to deploy your oVirt Engine.
But since that special Hosted Engine High Availability HA cluster itself needs management, we worked on making that be managed by the hosted engine itself, too.
Recent oVirt versions made it lot more easier to deploy hosted-engine, first by introducing the appliance and cloud-init customization phase, next with VM configuration being stored on the shared storage and making the VM itself manageable from the UI itself. A few more under-the-hood changes resulted in storing event the cluster configuration on the shared storage itself, opening the door to making the expanding of the HA-cluster even easier, as all answers and configuration were now already available.
What this version is adding is the capability to add and remove more HA hosts using the engine itself, instead of going over machine by machine and running the cli utility, hosted-engine --deployto get you up and running. Since oVirt has a well-established host installation subsystem, otopi, which installs and configures with host by the engine, we just needed to plug in the part to install and configure the HA services ovirt-ha-agent and broker.
Technically, it also makes the process go through the engine, which enforces the engine into being the single source of configuration instead of scattered configuration across hosts. After adding the master data domain and activating the DC, the VM is imported with the storage configuration into the engine. Our HA cluster is self aware! The disk has a special description by which we identify the disk.
The hosted-engine. The engine invokes the host-install process and passes a special section called deploy unit with the configuration. The HE package is being installed and hosted-engine.
Next, the services boots up and performs the regular steps to properly join the cluster—connect to the storage and monitor it, download the VM OVF and prepare a vm. How Does It Work?
Chapter 8: Storage
Next: After adding the master data domain and activating the DC, the VM is imported with the storage configuration into the engine. Add a host, choose the Hosted-Engine side tab and click Deploy. Comments are closed.Last month, the oVirt Project shipped version 4. Physical machines are best, but you can test oVirt using nested KVM as well. In my lab, I use a separate 10G nic on each of the hosts for my storage network. Next, open up a web browser and visit your first host at port to access the cockpit web interface.
The dialog window that appears contains a series of steps through which you provide gdeploy with the information it needs to configure your three nodes for running ovirt with gluster storage, starting with the hosts you want to configure. Click next to accept the defaults in step two, and then in step three, specify the gluster volumes you want to create.
The cockpit gdeploy plugin autofills some values here, including a volume for the engine, a data volume, and a second data volume called vmstore. This process will take some time to complete, as gdeploy installs required packages and configures gluster volumes and their underlying storage.
The installer will ask if you want to configure your host and cluster for Gluster. In some of my teststhe installer failed at this point, with an error message of Failed to execute stage 'Environment customization'.
In some of my tests with oVirt Node, the management network setup step failed due to the presence of an ifcfg-eth0. When I encountered this issueI removed the file from each of my hosts, restarted the process, and was able to proceed. First, we tell the installer to use the oVirt Engine Appliance image that gdeploy installed for us.
Then, we configure cloud-init to customize the appliance on its initial boot, providing various VM configuration details covering networking, VM RAM and storage amounts, and authentication. Enter the details appropriate to your environment, and when the installer asks whether to automatically execute engine-setup on the engine appliance on first boot, answer yes.
When the installation process completes, open a web browser and visit your oVirt engine administration portal at the address of your hosted engine VM. Log in with the user name admin and the password you chose during setup. You can Import them to engine or Detach them from the cluster. The export and iso domains, which oVirt uses, respectively, for import and export of VM images, and for storing iso images, can be set up in roughly the same way.
In this howto, host 3 is the arbiter for all four volumes, which leaves all of the storage burden on the first two hosts. Head over to the Hosts tab, select host two, and in the toolbar below the tabs, click Management, and then Maintenance, and hit OK in the dialog box that appears next. Once the host is in maintenance mode, click Installation, and then Reinstall in the toolbar. After that process completes, repeat the process on host three. Once all three hosts are back up, you should be able to put into maintenance mode and then upgrade or restart any one of the hosts at a time without losing access to the management engine or to your VM storage.
Clicking on this domain will bring up a menu of images available in this repository. The key thing to keep in mind regarding host maintenance and downtime is that this converged three node system relies on having at least two of the nodes up at all times.
The oVirt engine pays attention to the state of its configured gluster volumes, and will warn you if certain actions will run afoul of quorum rules or if your volumes have pending healing operations. You can bring a single machine down for maintenance by first putting the system into maintenance mode from the oVirt console by clicking on the host entry in the Hosts tab, and then, from either the tool bar below the tabs or from the right-click menu, choose Management, and then Maintenance, before updating, rebooting, shutting down, etc.In November, version 3.
Important Note: I want to stress that this converged virtualization and storage scenario is a bleeding-edge configuration.
Physical machines are best, but you can test oVirt using nested KVM as well. In my lab, I use a separate 10G nic on each of the hosts for my storage network. Then, install the hosted engine packages, along with screenwhich can come in handy during the deployment process:. We need a partition to store our Gluster bricks. I use system-storage-manager to manage my storage.
Rather than hand-edit my firewall configuration, I start out with no firewall active at all, and I allow oVirt engine to handle firewall configuration itself a bit later in the process:. I added nameserver Now, apply a set of virt-related volume options to our engine and data volumes, and properly set our volume permissions:. Here you need to specifiy the glusterfs storage type, and supply the path to your Gluster volume.
Now, we answer a set of questions related to the virtual machine that will serve the oVirt engine application. First, we tell the installer to use the oVirt Engine Appliance image that we downloaded earlier:.
Then, we configure cloud-init to customize the appliance on its initial boot, providing host name and network configuration information. Next, the installer will provide you with an address and password for accessing the VM with the vnc client of your choice. You can fire up a vnc client, enter the address provided and enter the password provided to access the VM, or you can access your engine VM via ssh using the hostname you chose above, which is what I prefer:.
Go through the engine-setup script, answering its questions. Once this completes, the installer will tell you to shut down your VM so that the ovirt-engine-ha services on the first host can restart the engine VM as a monitored service. Once the engine is back up and available, head to your second machine to configure it as a second host for our oVirt management server:. As with the first machine, the script will ask for the storage type we wish to use.
Just as before, answer glusterfs and then provide the information for your gluster volume, just as on host one. Answer yes, and when the script asks for a Host ID, make it 2. The script will then ask for the IP address and root password of your first host, in order to access the rest of the settings it needs. Once that process is complete, the script will exit and you should be ready to configure storage and run a VM.
The export and iso domains, which oVirt uses, respectively, for import and export of VM images, and for storing iso images, can be set up in roughly the same way.