Let’s try to understand the hosts in OLVM. We have got few major physical hosts that exist inside your Oracle Linux Virtualization Manager. The first one is the engine host. The engine host provides you with the administration tools. It’s a central management component and it runs the OLVM engine and it consists of interfaces for administering and for managing your virtual environments.
The OLVM engine can be used for managing your clusters, host, storage, virtual machines, networking, and other aspects of the virtual infrastructure. And it provides the features related to different structures like reporting, enabling administrators to track performance and health of the virtual environments. So an engine by itself is a separate physical host on which you install the it engine utility, which is actually used for managing the complete virtualized environment.
Then we have got the KVM host, which is capable of hosting virtual machines. The engine registers the KVM hosts which are actually capable of hosting your virtual machine. So virtual machine deployments and features or managing of these virtual machines all is done through your KVM host. It’s a physical machine which is actually hosted environment machine, which is registered with your engine.
And OLVM can manage Multiple Oracle Linux KVM hosts. A single engine Can manage multiple hosts. As we have seen earlier, a single engine powered engine can manage multiple data centers. Each data center can have multiple clusters and, each cluster can have multiple hosts.
So if you want to work with the host, these are the options which are available. So if you look at your administration portal page, you go to your compute, and inside the compute, you’ll select the host, and inside the host, you’ll get a list of available hosts that have been configured under that particular listing of your engine.
So you can see all the host. And if you look at the table that describes the host available for you, it gives you the name of the host, the host name or the IP address, the cluster name to which it belongs, and the data center to which it belongs. And you can also view the virtual machines and the memory used by that particular host. So active virtual machines and the memory being utilized.
Other than that, to manage the host, we need to select the host and go to the menu options or the buttons which are provided, like the New button to create a new host or register a new host, edit an existing host, installation like reinstall the host, host console to access the host console, Copy host networks, if we want to select the host networks and register it with some other host, I can use the copy host networks.
The important button there is the management button. The management button helps you in managing the host, which gives you the options to convert your host into maintenance mode, get the options like activate the host if it’s inactive, refresh the capabilities to upgrade or update the information of the host, manage the power, that is power management, restart, stop, or start the host, you can go with accessing with SSH management, you can restart, stop, and you can select as SVM, you can convert this host to be a part of your storage pool management SVM role and then configure local storage. So if you want to configure a local storage on the KVM host. I can select the KVM host and make it as a local storage host. But the host should be in maintenance mode.
So to manage the host, we have got the Manage button, to which we can manage multiple actions that can be performed on the host. Once you have created a new host or registered the host, you learn how to register a host in module number 4, where we’ll be talking about the host installation. So in chapter 4, you’ll be discussing on how to register the host. But once the host is registered, you get a detailed page of the host.
The detailed page of the host describes multiple properties of the single host. So it gives you a number of virtual machines running over it. What are the network interfaces configured, what are the host devices, permissions, affinity labels, errata, and the events. It also gives you the commands to manage the host from the details page. So you have got the Edit button to edit your host, management button, installation button, and to access the host console. So these are the buttons, which are available for you to manage your host.
Now coming down to the affinity label. Like last time, you have seen the affinity rules that we can configure in the cluster. Now we have also seen can configure affinity labels in the cluster, which can be used with the affinity rules. You can also have host affinity labels. Host affinity labels are used to influence the placement and behavior of virtual machines in relation to specific host within a cluster.
These labels provide a way to group host together based on certain criteria and enforce policies that dictate how VMs interact with these groups. If I’m talking about the host affinity labels, they are custom tags. Affinity labels help in organizing and managing hosts more efficiently by creating logical grouping. It is basically used to enforce policies that define how VMs should interact with the host. It improves resource utilization and it supports high availability and fault tolerance if you have configured the affinity labels.
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