Ignite + Cluster API Aarhus Meetup

Online slides: https://docs.google.com/presentation/d/1QF6URiwG2IobuwCBn5WJuBlJfTeVDQM4n2FJUUAq2Bw/edit
Meetup page: https://www.meetup.com/Cloud-Native-Aarhus/events/264122411/
Location: ORBIT Lab, Aarhus, Denmark

Transcript

1. 1 Weave Ignite, Kubernetes Cluster API, and all the things! Lucas Käldström - CNCF Ambassador 21st of August, 2019 - Aarhus Image credit: @ashleymcnamara
2. 2 $ whoami Lucas Käldström, soon-to-be University Student, 19 yo CNCF Ambassador, Certified Kubernetes Administrator and (former) Kubernetes WG/SIG Lead KubeCon Speaker in Berlin, Austin, Copenhagen, Shanghai & Seattle KubeCon Keynote Speaker in Barcelona Kubernetes approver and subproject owner, active in the community for 3+ years. Got kubeadm to GA. Weave Ignite creator Driving luxas labs which currently performs contracting for Weaveworks
3. 3 Cloud Native Nordics is growing!
4. A bit of history
5. 5 My first OSS project. Wanted to use k8s on my Pis kubernetes-on-arm
6. 6 KubeCloud Got in touch with Kasper Nissen and Martin Jensen, writing their Master’s Thesis. They used kubernetes-on-arm :)
7. 7 minikube & kubeadm Wanted to simplify the deployment experience Helped create SIG Cluster Lifecycle => co-lead until now Shepherding kubeadm
8. 8 Cluster API The next step after kubeadm “To make the management of (X) clusters across (Y) providers simple, secure, and configurable.” “How can I manage any number of clusters in a similar fashion to how I manage deployments in Kubernetes?”
9. 9 Weave Ignite “An open source Virtual Machine (VM) manager with a container UX and built-in GitOps management” - Firecracker MicroVMs & OCI containers to unify containers and VMs. - Works in a GitOps fashion; manages VMs declaratively
10. Enter the fire
11. 11 Why? Originates from my Finnish conscription time; where I worked on programming tasks We needed to: a) Use open source (no “normal” VM licenses) b) Run legacy applications with “special requirements” c) Integrate with containers
12. 12 How? BUT: Firecracker is HARD to use (for those who happen to not be KVM devs)
15. 15 Weave Ignite What does it do? Why do you want it? Declarative Infra Next level VM speed
16. 16 # Let's run the weaveworks/ignite-ubuntu docker image as a VM # Use 2 vCPUs and 1GB of RAM, enable automatic SSH access and name it my-vm ignite run weaveworks/ignite-ubuntu \ --cpus 2 \ --memory 1GB \ --ssh \ --name my-vm # List running VMs ignite ps # List Docker (OCI) and kernel images imported into Ignite ignite images ignite kernels # Get the boot logs of the VM ignite logs my-vm # SSH into the VM ignite ssh my-vm Demo!
17. 17 Ways to use Ignite - Docker-like UX - GitOps - (Future) Virtual Kubelet
18. 18 Design & Architecture Use OCI for: a) content distribution b) monitoring processes c) process isolation Device Mapper & DHCP bridges containers + VMs
19. 19 Building VM images (the new way)
20. 20 GitOps all the things! a) Store desired state in Git b) Run an app reconciling desired => actual state c) App writes status back to Git d) Can observe diffs between observed and desired state
21. 21 Run Kubernetes on top of Ignite VMs - kind - kubeadm / k3s guide - Footloose (docker-compose) - Cluster API providers - => Firekube?
22. 22 => gitops-toolkit Prototype to make any app Git-backed Generic framework built upon k8s.io/apimachinery Common code broken out from Ignite
23. 23 Read the Docs
24. 24 Raspberry Pis! Challenge: Get Firecracker to run on a Raspberry Pi 4. Tried RPi 3 without success b/c lack of a GIC. Ignite/Firecracker has arm64 binaries, but need GICv2 support
25. Kubernetes Cluster API
26. 26 Nodes Control Plane Kubernetes’ high-level component architecture Node 3 OS Container Runtime Kubelet Networking Node 2 OS Container Runtime Kubelet Networking Node 1 OS Container Runtime Kubelet Networking API Server (REST API) Controller Manager (Controller Loops) Scheduler (Bind Pod to Node) etcd (key-value DB, SSOT) User Legend: CNI CRI OCI Protobuf gRPC JSON
27. 27 kubeadm = A tool that sets up a minimum viable, best-practice Kubernetes cluster Master 1 Master N Node 1 Node N kubeadm kubeadm kubeadm kubeadm Cloud Provider Load Balancers Monitoring Logging Cluster API Spec Cluster API Cluster API Implementation Addons Kubernetes API Bootstrapping Machines Infrastructure Layer 2 The scope of kubeadm Layer 3 Layer 1
28. 28 kubeadm vs kops or kubespray Two different projects, two different scopes Master 1 Master N Node 1 Node N kubeadm kubeadm kubeadm kubeadm Cloud Provider Load Balancers Monitoring Logging Cluster API Spec Cluster API Cluster API Implementation Addons Kubernetes API Bootstrapping Machines Infrastructure kops
29. 29 • The What and the Why of Cluster API ◦ “To make the management of (X) clusters across (Y) providers simple, secure, and configurable.” ◦ “How can I manage any number of clusters in a similar fashion to how I manage deployments in Kubernetes?” ◦ “How do I manage other lifecycle events across that infrastructure (upgrades, deletions, etc.)?” ◦ “How can we control all of this via a consistent API across providers?” Cluster API
30. 30 “GitOps” for your cluster(s) apiVersion: cluster.k8s.io/v1alpha1 kind: MachineDeployment metadata: name: my-nodes spec: replicas: 3 selector: matchLabels: foo: bar template: metadata: labels: foo: bar spec: providerConfig: value: apiVersion: "baremetalconfig/v1alpha1" kind: "BareMetalProviderConfig" zone: "us-central1-f" machineType: "n1-standard-1" image: "ubuntu-1604-lts" versions: kubelet: 1.14.2 containerRuntime: name: containerd version: 1.2.0 • With Kubernetes we manage our applications declaratively a. Why not for the cluster itself? • With the Cluster API, we can declaratively define the desired cluster state a. Operator implementations reconcile the state b. Use Spec & Status like the rest of k8s c. Common management solutions for e.g. upgrades, autoscaling and repair d. Allows for “GitOps” workflows
31. 31 Cluster API cluster-addons kubeadm etcdadm Component Config k8s cluster Provisioners We need your help! There is still a lot of work to do in onder to get the full puzzle in place! The SIG Cluster Lifecycle Roadmap
32. Recap
33. 33 Weave Ignite Firecracker SIG Cluster Lifecycle kubeadm Cluster API Raspberry Pi Questions?
34. Thank you! @luxas on Github @luxas on Kubernetes’ Slack @kubernetesonarm on Twitter lucas@luxaslabs.com