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Virtual Machine Management on Kubernetes
Kunal Kushwaha
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VM Platform
oVirt/VMWare ESX/OpenStack/Cloud
app-1 app-2 app-N
VM Platform
oVirt/VMWare ESX/OpenStack/Cloud
app-1
app-2
kernel
app-N
app-1
app-2
app-
M
Current Situation in Enterprise
Existing Products New Products
Fragmentation
VM VM VM
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Why still use Virtual Machine?
- Learning and planning for migrating existing Applications to Containers
- Migration also means cost.
- Not only requires Ops team but development team too. (complete software cycle)
- Not all applications can be Containerized
- Application designed for custom kernel?
- Needs specific kernel parameters.
- Lack of knowledge / Too complex to migrate in containers.
- Application towards end of life.
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So what we want?
● Run VM and containers in same platform i.e. Kubernetes
● Let containers and VM interact as any kubernetes pods do.
● Yet let VM to behave as VM, not application containers.
VM Platform
oVirt/VMWare ESX/OpenStack/Cloud
app-1 app-2 app-N
app-1
app-2
kernel
app-N
app-1
app-2
app-
M
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How to run VM in Kubernetes?
- Kata Containers?
- Runs application containers with VM level isolation.
- Essentially runs VM as container
- We need VM to run as VM, not containers !
KubeVirt
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KubeVirt
- Enables to run VM along with containers on Kubernetes.
- Implemented as CRD (Custom Resource Definition)
- Can be installed on existing Kubernetes cluster.
- VM’s live in Pod (Transparent to monitoring API’s)
- Uses kvm, qemu, libvirt runtime stack to run VM.
- VM’s can interact with pods in cluster.
- Helps in easy migration of existing applications.
- Helps in Lift and Shift approach
KubeVirt
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Control Flow & Architecture
API Server
Virt Controller
Kubelet
Virt handler
app-1
POD
app-2
POD
app-3
Kube Master Kube Node(s)
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How to interact?
- Kubectl
- KubeVirt Objects
- VirtualMachine & VirtualMachineInstance
- Management of VM & VMI objects
- Virtctl
- Interaction with VM’s
- Accessing console, VNC
- Creating services to access VM ports
- GUI
- Overall Management.
- https://github.com/kubevirt/web-ui
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Example YML
---
apiVersion: kubevirt.io/v1alpha3
kind: VirtualMachineInstance
metadata:
labels:
special: vmi-fedora
name: vmi-fedora
spec:
domain:
devices:
disks:
- disk:
bus: virtio
name: containerdisk
- disk:
bus: virtio
name: cloudinitdisk
machine:
type: ""
resources:
requests:
memory: 1024M
terminationGracePeriodSeconds: 0
volumes:
- containerDisk:
image: kubevirt/fedora-cloud-container-disk-demo:devel
name: containerdisk
- cloudInitNoCloud:
userData: |-
#cloud-config
password: fedora
chpasswd: { expire: False }
name: cloudinitdisk
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Important Commands
● Create a virtual machine instance.
$ Kubectl apply -f fedora.yaml
● Get list of all virtual machine instance
$ kubectl get vmi
● Describe instance of virtual machine instance
$ kubectl describe vmi vm-fedora
● Create services and expose ports.
$ virtctl expose vmi vm-fedora --name
● Like exec for containers.
$ virtctl console vm-fedora
● Access GUI of Virtual machine
$ virtctl vnc vm-fedora
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Key Points
- Networking
- Backend: Expose to actual networking infrastructure in cluster
- Pod, Multus & Genie (CNI plugins supporting dozen of solutions)
- Frontend: VM networking.
- Bridge, NAT, Slirp & SR-IOV
- Storage (Disks & Volume)
- Disk types
- LUN (iSCSI),disk, floppy, CD Rom
- Volumes
- Temporary(VM life cycle) & persistent volume both are supported
- Virtio drivers for Microsoft Windows
- Supports Live Migration
- Probes for health check and monitoring.
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Under Active Development
https://kubevirt.io/
Github: https://github.com/kubevirt/kubevirt
Try on Minikube: http://kubevirt.io/get_kubevirt/
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Thanks ありがとう