Kubevirt Planning: Storage, Network And Security Considerations

This is an excerpt from Chapter 3 of “Running Virtual Machines connected Kubernetes: A Practical Roadmap for Enterprise Migrations,” a caller ebook by acclaimed investigation expert and exertion master Janakiram MSV and sponsored by Spectro Cloud.

From exploring nan architecture and life rhythm of virtual machines (VMs) successful a unreality autochthonal environment, to building cross-functional migration teams and selecting nan correct tools, this free book, now disposable for download, helps endeavor leaders navigate this once-in-a-generation displacement pinch confidence.

Building a production-ready KubeVirt level requires observant readying astir networking, retention and security. Each area builds upon Kubernetes foundations while adding VM-specific capabilities and requirements.

Storage Architecture

KubeVirt leverages Kubernetes-native retention concepts for VM disk management. VMs usage Persistent Volume Claims (PVCs) to petition retention alternatively than utilizing accepted information stores. The retention characteristics, specified arsenic capacity profiles and entree modes, are defined done StorageClass objects, which link to underlying retention systems via Container Storage Interface (CSI) drivers.

Live migration requires retention that aggregate nodes tin entree simultaneously. This typically involves utilizing StorageClass objects that supply ReadWriteMany (RWX) volumes done technologies specified arsenic Network File System (NFS), CephFS aliases distributed retention systems. For high-performance workloads specified arsenic databases, PVCs tin beryllium configured pinch volumeMode group to Block, providing earthy artifact devices straight to VMs for optimal input/output (I/O) performance.

KubeVirt besides supports retention operations, specified arsenic cloning and snapshots, erstwhile nan underlying CSI driver provides these capabilities. This enables workflows specified arsenic creating VM templates from existing disks aliases taking point-in-time backups of moving systems.

Network Configuration

VMs link to nan Kubernetes pod web by default utilizing a masquerade binding, which provides Network Address Translation (NAT) entree to nan cluster network. This attack integrates VMs seamlessly pinch existing Kubernetes networking and work find mechanisms.

More analyzable networking scenarios require further tools. Multus serves arsenic a Container Network Interface (CNI) meta-plugin that enables pods and their contained VMs to connect to aggregate networks simultaneously. This capacity supports usage cases for illustration connecting VMs to circumstantial virtual LANs (VLANs) done span networks aliases providing high-performance connectivity via Single Root I/O Virtualization (SR-IOV) pass-through devices.

The prime of CNI plugin has a important effect connected nan disposable networking features. Different CNI implementations connection varying levels of functionality to meet precocious networking requirements, including web segmentation, postulation shaping and capacity optimization.

Security Framework

KubeVirt inherits Kubernetes information models while extending them for VM workloads. Namespaces supply nan superior isolation boundary, grouping related VMs and containers while controlling their entree to cluster resources. This attack creates logical separation, akin to organizing VMs into folders aliases assets pools.

Role-based entree power (RBAC) defines granular permissions for VM management. RBAC policies specify which users aliases work accounts tin create, delete, modify aliases entree VMs wrong circumstantial namespaces. This enables fine-grained delegation of administrative responsibilities crossed different teams aliases projects.

Network policies power postulation travel betwixt VMs and different cluster workloads. These policies supply basal web segmentation capabilities, though their effectiveness depends wholly connected nan CNI plugin implementation. Some CNI solutions connection much precocious argumentation enforcement and monitoring capabilities than others.

Pod Security Standards and admittance controllers tin enforce information policies connected VM workloads conscionable for illustration containerized applications. This includes restrictions connected privileged operations, assets limits and information contexts that govern really VMs run wrong nan cluster.

Integration Considerations

VM guidance done KubeVirt inherits galore advantages from nan Kubernetes platform. Resource guidance uses nan aforesaid quota and limit systems arsenic containers. Network policies usability consistently crossed some VMs and pods. Storage guidance adheres to modular Kubernetes patterns, utilizing persistent volumes and retention classes.

The declarative exemplary intends VM configurations tin beryllium version-controlled, reviewed and deployed done modular DevOps practices. Teams tin use nan aforesaid GitOps workflows utilized for containerized applications to their VM infrastructure, bringing consistency to operations crossed different workload types.

The convergence of VM and instrumentality workloads connected a azygous level creates opportunities for unified guidance approaches. Storage policies tin use consistently crossed some workload types. Network segmentation strategies tin encompass VMs and pods wrong nan aforesaid argumentation framework. Security controls use from centralized guidance and accordant enforcement mechanisms.

However, this integration besides requires observant readying to guarantee that VM-specific requirements, specified arsenic unrecorded migration, console entree and compatibility pinch bequest applications, are adequately addressed wrong nan broader Kubernetes operational model.

To publication more, download “Running Virtual Machines connected Kubernetes: A Practical Roadmap for Enterprise Migrations” today!

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