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k8s NodeSet
K8s NodeSet allows a Kubernetes cluster to manage its own worker nodes. It provides a native integration that allows developers to scale the cluster themselves using a "pets vs cattle" approach for nodes. The NodeSet controller creates and deletes node resources to ensure the number of nodes matches the specified replicas in the NodeSet manifest.
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k8s NodeSet
- 1. K8s NodeSetLet aKubernetes cluster manage its worker nodes by itself
- 2. Company: Loodse GmbH Focus:Container and Cloud Native technologies Product: Kubermatic Headquarter: Hamburg, Germany Partner: Google Cloud Platform Partner Member of CNCF and Linux Foundation Loodse
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- 4. Current approach • NeedsOps to scale the cluster • No generic approach • Each implementation needs specific knowledge • Scaling of new nodes needs external dependencies • No generic node auto scaling • Huge effort to deploy k8s on a different platform Node Node Node Master Node
- 5. PersistentVolumes A higher-level storageabstraction • insulation from any one cloud environment Admin provisions them, users claim them Independent lifetime from their consumers Dynamically “scheduled” and managed Pod Claim
- 6. Native integration • Devcan scale the cluster • Pets vs cattle for nodes • Implementation of generic auto scaling possible • Very similar setup for different provider kubectl create nodes Node Node Node Master Node
- 7. Nodes Current node lifecycle •Event executed -> node resource get’s created General k8s resource lifecycle • Resource get’s created -> event executed
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- 9. NodeController Watch for newNode resources Provision the machine at the cloud provider • Machine joins the cluster • Kubelet updates the Node resource Deletes the machine at the cloud provider Node Resources
- 10. NodeClass Cloudprovider & OSspecific details Spec • Cloudprovider credentials • Machine type (e.g. t2.medium) • Provisioning • Files e.g systemd unit, ssh keys • ssh commands Node Resources Class
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- 12. NodeSet Group of similarnodes Integration with node autoscaler Spec: • Replicas -> number of nodes • NodeController • NodeClass Node Res Class Node Res Node Res
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- 14. NodeSetController Node Res Class Node Res Node Res Create and deletenode resources Makes sure • Number of nodes == nodeset.replicas
- 15. DEMO TIME “Praise the demogods” - Kelsey Hightower
- 16. Thanks to themaintainer of the K8s NodeSet â—Ź Russell Wu â—Ź Ivan Diao â—Ź Stefan Schimanski â—Ź Henrik Schmidt https://github.com/kube-node END
- 17. We are hiring! Hamburg,Berlin, San Francisco, … Homepage: www.loodse.com Twitter: @Loodse
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