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Kubernetes scalability: Federation & Cluster API
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Katie Gamanji
September 27, 2019
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Kubernetes scalability: Federation & Cluster API
Kubernetes scalability: Federation & Cluster API for Cloud Native London conference 2019
Katie Gamanji
September 27, 2019
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Transcript
Katie Gamanji Cloud Platform Engineer Condé Nast International @k_gamanji katie-gamanji
Kubernetes scalability: Federation & Cluster API @k_gamanji katie-gamanji
Condé Nast International has set the benchmark for print and
digital publishing with a heritage of more than 110 years.
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Markets 11 Websites 62 Unique users 200m Digital readership 1.1bn
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Federation v2 Cluster API
Federation v2 Cluster API
Federation v2 Cluster API
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
Cluster API
Unique users Unique users Total digital readership 9m 62m 360m
Russia China
Cluster API Provision of declarative APIs for cluster creation, configuration,
and management.
Cluster API SIG-cluster-lifecycle: • Initial release: April 2019 • API:
v1alpha2
Cluster API • Cluster - CIDRs for pods and services
+ DNS suffix • Machine - kubelet and control plane versions • MachineSet • MachineDeployment
1 / 3
Management cluster Target clusters 2 / 3 • core •
bootstrap • infrastructure providers
Management cluster Target clusters 3 / 3 • core •
bootstrap • infrastructure providers
Cluster API DEMO https://asciinema.org/a/caUpnqVCUz2PP1Fui wPiDQfkj
Building blocks Cloud agnostic Experimental Takeaways
Federation v2 Cluster API
References Federation v2 • https://github.com/kubernetes-sigs/ federation-v2 ClusterAPI • https://cluster-api.sigs.k8s.io
https://www.condenastinternational.com/careers @k_gamanji katie-gamanji
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