Pet VMs in Kubernetes? WTH
Fabian Deutsch, Red Hat
devconf.cz, 2017
@dummdida - dummida.tumblr.com
https://www.flickr.com/photos/infinitelydigital/3763912574/
Why?
Pet VMs
- Many knobs and switches
- Hand crafted - VM and its contents
"Oh! I deleted the VM. Argh."
Kubernetes
- It's all about running containers
- Images become ready-to-use containers
"Oh - I deleted a container?"
Container Cluster
VM Cluster
Workloads: Differ
Container Cluster
VM Cluster
Infrastructure: Similar
Container Cluster
VM Cluster
Scheduling ~ Storage ~ Network ~ Host life-cycle
Same infrastructure & different workloads
Container and VM Cluster
Scheduling ~ Storage ~ Network ~ Host life-cycle
First Try
s /docker/qemu/
Try: Don't run a pod but a pet VM instead
Keep everything Kubernetes, just replace the launcher
Ugh.
(Fail)
Representation + Handling
Try Again
KubeVirt
- Virtualization add-on to Kubernetes
- Resources, controllers & daemons
Kubernetes
virt-controller
VM (TPR)
.
.
virt-handler
VM
kubelet
Cluster
Host
Pod
Pod
Pod
$ curl run.kubevirt.io/demo.sh | bash
Up Next →
-
Disks
-
Networks
-
Improved Scheduling
…
Beyond
-
Live Migration
-
Templating
-
Host API
-
K8s TPR Improvements
-
K8s Snapshot Improvements
-
K8s Volume Cloning
…
Ouch. Issues. Ouch. Gaps.
Opportunities
Common ground for cluster wide virtualization management.
- Focus on virtualization and consume infrastructure
- Embrace Kubernetes as a cluster manager
- Improve Kubernetes in supporting other workloads
Questions?
http://kubevirt.io
@kubevirt
irc: fabiand
fabiand@redhat.com
@dummdida
Join the KubeVirt Gathering on
Saturday, 12 noon, C236