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Kubernetes Scalability: Federation and ClusterAPI
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Katie Gamanji
January 14, 2020
Technology
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Kubernetes Scalability: Federation and ClusterAPI
Katie Gamanji
January 14, 2020
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Transcript
Kubernetes scalability: Federation & Cluster API @k_gamanji katie-gamanji
Katie Gamanji Cloud Platform Engineer Condé Nast @k_gamanji katie-gamanji
Kubernetes scalability: Federation & Cluster API @k_gamanji katie-gamanji
Condé Nast Platform Federation V2 ClusterAPI
Condé Nast Platform Federation V2 ClusterAPI
Condé Nast Platform Federation V2 ClusterAPI
Condé Nast Platform Federation V2 ClusterAPI
Has set the benchmark for print and digital publishing with
a heritage of more than 110 years.
None
Markets 12 Websites 86 Unique users 336m Digital readership 1.6bn
October 2019
None
None
Migrated websites 22/35 Digital readership 268m November 2019
Federation v2
Federation v2 Mechanism for managing applications and services in multiple
Kubernetes clusters tracked by the Kubernetes cluster registry.
Federation v2 SIG multicluster: • Federation ◦ v1 - deprecated
◦ v2 (alpha) - requires v1.13 • Cluster registry ◦ maintain list of clusters and associated metadata
1 / 4
Host cluster Member clusters 2 / 4
Host cluster Member clusters Cluster registry Federation APIs 3 /
4
Host cluster Member clusters Control plane 4 / 4 Applications
& services
Federation v2 Cluster placement • targeted clusters by the federation
Configuration overrides • patches to federated resources
Federation v2 Cluster Placement • clusters spec: placement: clusters: -
name: cluster2 - name: cluster1 • clusterSelector spec: clusterSelector: matchLabels: region: eu-central-1
Federation v2 Configuration overrides • Replace (default), add or remove
spec: overrides: - clusterName: cluster1 clusterOverrides: - path: "/spec/replicas" value: 5
apiVersion: types.kubefed.io/v1beta1 kind: FederatedDeployment metadata: name: nginx-deployment spec: template: spec:
replicas: 3 [...] placement: clusters: - cluster2 - cluster1 overrides: - clusterName: cluster2 clusterOverrides: - path: "/spec/replicas" value: 7
Federation v2 DEMO https://asciinema.org/a/caUpnqVCUz2PP1Fui wPiDQfkj
Resource management Namespace scoped control plane Conditional scalability Takeaways Higher
level behaviour
ClusterAPI
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Russia China Unique users 10m Unique users 53m Total digital
readership 335m
K8s Bootstrap Tools Kubeadm Kubespray Kops Tectonic
ClusterAPI Provision of declarative APIs for cluster creation, configuration, and
management.
ClusterAPI SIG-cluster-lifecycle: • Initial release: April 2019 • API: v1alpha2
1 / 4
Management cluster Target clusters 2 / 4 Controller managers
3 / 4: Controller Managers Infrastructure Providers Bootstrap Providers ClusterAPI
CRDs + +
Management cluster Target clusters 4 / 4 Controller managers
ClusterAPI - CRDs • Cluster - CIDRs for pods and
services + DNS suffix • Machine - kubelet and control plane versions • MachineSet • MachineDeployment
ClusterAPI DEMO https://asciinema.org/a/DaMKYCSaHWu qFq1l4pEAZMKsR
Building blocks Cloud agnostic Experimental Takeaways
Condé Nast Platform Federation V2 ClusterAPI
References Federation v2 • https://medium.com/@k_gamanji/k8s-feder ation-v2-a-guide-on-how-to-get-started-ec9 cc26b1fa7 ClusterAPI • https://medium.com/@k_gamanji/clustera
pi-a-guide-on-how-to-get-started-ff9a81262 945
https://www.condenast.com/careers @k_gamanji katie-gamanji
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