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KubeWHAT!?
KubeVirt is an add-on for Kubernetes that allows for virtual machines to be scheduled alongside containers. It provides a dedicated API for managing virtual machines as pods. The presentation discusses how KubeVirt could provide a migration path for workloads from VMs to containers and converge infrastructure by allowing OpenStack and other platforms to use KubeVirt and Kubernetes for scheduling. It also covers demoing KubeVirt and potential approaches for integrating it with OpenStack, such as through a Nova virt driver or compatible API.
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KubeWHAT!?
- 1. KubeWHAT!? Using KubeVirt tobring virtual machines to Kubernetes and what it means for OpenStack Stephen Gordon (@xsgordon) October 19th, 2017
- 2. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 DISCLAIMER This is not a product pitch, this is R&D. There be dragons!
- 3. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 WHAT IS KUBEVIRT? Add-on that extends Kubernetes to support scheduling of VM workloads alongside container workloads. https://github.com/kubevirt
- 4. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 WHAT IS KUBEVIRT? ● Drops directly into existing Kubernetes Clusters ○ No additional host setup ○ Simple Install ○ Extends kubernetes so VMs can be scheduled alongside Containers ● Ties VMs into Pod Network ● Integrates with other Kubernetes concepts (like Persistent Volumes) ● Manage VMs like Pods
- 5. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 KUBEVIRT IS NOT A CRI IMPLEMENTATION! ● Hypervisor CRI ○ Pod specification is the API ● KubeVirt: ○ Dedicated API ■ Virtual devices ■ Live migration ■ More VM specific needs in the future... CRI = Container Runtime Interface
- 6. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 KUBEVIRT IS NOT A CRI IMPLEMENTATION!
- 7. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 WHY? ● Migration Path ○ People invested in VMs can migrate to containers and bring VMs with them ● VM Scheduler Convergence ○ OpenStack, oVirt, others, can potentially converge on a common scheduler ● Container Workload Isolation ○ Running untrusted container workloads in a hypervisor ● Infrastructure convergence ○ Moves towards unified infrastructure capable of scheduling all workloads
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- 9. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 DEMO Pre-requisites: ● kubectl ● minikube $ minikube start --vm-driver kvm --network-plugin cni $ git clone https://github.com/kubevirt/demo.git $ cd demo $ ./run-demo.sh
- 10. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 DEMO (cont.) ● Review what the demo script does. ● Dive into each pod’s contents with focus on: ○ Where our storage comes from. ○ Where the VMs run. ○ The VM pod! ● Consoles and SPICE ● Launch a second VM.
- 11. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 TYPICAL WORKFLOW kind: VirtualMachine metadata: name: testvm spec: domain: devices: graphics: - type: spice consoles: - type: pty In case of ERR_DEMO_NO_WORKIE Typical Pod commands: ● kubectl create -f mypodspec.yaml ● kubectl delete mypod ● kubectl exec mypod -it /bin/bash Typical VirtualMachine commands: ● kubectl create -f myvmspec.yaml ● kubectl delete testvm ● kubectl plugin virt console testvm ● kubectl plugin virt spice testvm
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- 13. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 WHERE DOES OPENSTACK FIT? ● Infrastructure provisioning capabilities and back-end ecosystem: ○ Bare-metal ○ Networking ○ Storage ● Standardized APIs and management/operational ecosystem: ○ Clients ○ Orchestrators ○ Cloud Management Platforms
- 14. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 WHAT IS DICOT? Building a path towards using KubeVirt to manage virtual machines while supporting existing user investments in OpenStack APIs. https://dicot-project.github.io/about
- 15. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 POTENTIAL APPROACHES ● Nova virt driver for KubeVirt ○ Simplest option evaluated. ○ Similar to approach of Nova vCenter driver, single Nova instance is in fact a cluster. ○ Limits convergence opportunities somewhat. ● OpenStack compatible API for KubeVirt ○ Fuller convergence model, esp. in terms of base requirements. ○ Potential long “string” of APIs required beyond core to run VMs. ○ Potential to still use full OpenStack services as backends where supported (e.g. volumes, networks, etc.) ● Other approaches considered but discarded incl. via Cell, direct RPC.
- 16. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 DIAGRAM: NOVA VIRT DRIVER FOR KUBEVIRT
- 17. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 DIAGRAM: OPENSTACK COMPATIBLE API
- 18. KUBEWHAT!? - OPENSTACKDAY CANADA 2017 INTERESTED IN COLLABORATING? Join us in the Virtualized Workloads Saloon at KubeCon NA in Austin TX! KubeVirt ● GitHub: ○ https://github.com/kubevirt/kubevirt ● Mailing List: ○ https://groups.google.com/forum/#!forum/kubevirt-dev ● IRC: ○ #kubevirt on irc.freenode.net Dicot ● GitHub: ○ https://github.com/dicot-project/ Slides will be posted, look for a link from @xsgordon on Twitter.
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