Kubernetes for the Mesos User

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Kubernetes for the Mesos User Denver Mesos Users Group, July 12 2016 1

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Brian Hicks brian@aster.is @brianhicks Denver Mesos Users Group, July 12 2016 2

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Denver Mesos Users Group, July 12 2016 3

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Demo! Denver Mesos Users Group, July 12 2016 4

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Kubernetes? Kubernetes is an open-source platform for automating deployment, scaling, and operations of application containers across clusters of hosts. 4 kubernetes.io (emphasis mine) Denver Mesos Users Group, July 12 2016 5

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Web Interface Denver Mesos Users Group, July 12 2016 6

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Denver Mesos Users Group, July 12 2016 7

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Denver Mesos Users Group, July 12 2016 8

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Scheduling Denver Mesos Users Group, July 12 2016 9

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Mesos 2-level scheduler, based on resources 1. Workers offer resources to masters 2. Masters offer resources to frameworks 3. Frameworks accept resource offers 4. Work gets scheduled Denver Mesos Users Group, July 12 2016 10

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Kubernetes Multi-step constraint-based scheduler 1. Find "suitable" nodes for pod 2. Rank best nodes - for example, by least scheduled 3. Work gets scheduled Denver Mesos Users Group, July 12 2016 11

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Application Definition Denver Mesos Users Group, July 12 2016 12

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Marathon { "id": "basic-0", "cmd": "while [ true ] ; do echo 'Hello Marathon' ; sleep 5 ; done", "cpus": 0.1, "mem": 10.0, "instances": 1 } Denver Mesos Users Group, July 12 2016 13

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Kubernetes --- apiVersion: extensions/v1beta1 kind: Deployment metadata: name: basic-0 spec: replicas: 1 template: metadata: labels: app: basic-0 spec: containers: - name: basic-0 image: docker.io/gliderlabs/alpine:3.2 resources: limits: cpu: 100m memory: 10Mi args: - /bin/sh - -c - while [ true ] ; do echo Hello Kubernetes ; sleep 5 ; done Denver Mesos Users Group, July 12 2016 14

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Kubernetes (CLI) kubectl run \ basic-0 \ --image=docker.io/gliderlabs/alpine:3.2 \ --limits="cpu=100m,memory=10Mi" \ -- /bin/sh -c 'while [ true ] ; do echo Hello Kubernetes ; sleep 5 ; done' Denver Mesos Users Group, July 12 2016 15

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When K8s, when Mesos? Denver Mesos Users Group, July 12 2016 16

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Fault Tolerance: Tie! Denver Mesos Users Group, July 12 2016 17

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Data Frameworks: Mesos Denver Mesos Users Group, July 12 2016 18

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12-factor Apps: K8s Denver Mesos Users Group, July 12 2016 19

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UI: Mesos Denver Mesos Users Group, July 12 2016 20

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CLI: K8s Denver Mesos Users Group, July 12 2016 21

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IP-Per-Container: K8s Denver Mesos Users Group, July 12 2016 22

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Multitenancy: K8s Denver Mesos Users Group, July 12 2016 23

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Questions? Denver Mesos Users Group, July 12 2016 24