Autoscaling in Kubernetes

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©2018 Wantedly, Inc. autoscaling/v2 ෳ਺ͷϝτϦΫεΛઃఆՄೳ ͲΕ͔ͻͱͭͰ΋ᮢ஋Λ௒͑Δͱεέʔϧ͢Δ • Resource: CPUɾϝϞϦ ͷ࢖༻཰ • Object: Kubernetes ͕؅ཧ͢ΔϦιʔεͷϝτϦΫε • Pods: Pod ʹؔ͢ΔϝτϦΫε • External: Kubernetes ͷϦιʔεʹؔ࿈͠ͳ͍ϝτϦΫε Horizontal Pod Autoscaler

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©2018 Wantedly, Inc. 1SPNFUIFVT 1SPNFUIFVT 1PE 1PE HPA + Custom Metrics ͷߏ੒ .BTUFS/PEF $VTUPN.FUSJDT "1*4FSWFS ,VCFSOFUFT "1*4FSWFS 1PE "QQMJDBUJPO /HJOY OHJOY FYQPSUFS proxy )1" metrics proxy stub_status 1SPNFUIFVT 1SPNFUIFVT 0QFSBUPS manage metrics %FQMPZNFOU scale 3FQMJDB4FU manage manage metrics

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©2018 Wantedly, Inc. Prometheus Operator apiVersion: monitoring.coreos.com/v1 kind: ServiceMonitor metadata: name: service-monitor namespace: custom-metrics labels: service-monitor: prometheus spec: selector: matchLabels: custom-metrics: prometheus namespaceSelector: any: true endpoints: - port: http - port: https custom-metrics: prometheus ͷϥϕϧ͕෇͍͍ͯΔαʔϏε Λ؂ࢹ

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©2018 Wantedly, Inc. Nginxͷstub_status location /basic_status { stub_status; } Active connections: 291 server accepts handled requests 16630948 16630948 31070465 Reading: 6 Writing: 179 Waiting: 106 ଴ͪίωΫγϣϯ਺Λ࢖͏

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©2018 Wantedly, Inc. Active connections: 291 server accepts handled requests 16630948 16630948 31070465 Reading: 6 Writing: 179 Waiting: 106 nginx-exporter # HELP nginx_connections_current Number of connections currently processed by nginx # TYPE nginx_connections_current gauge nginx_connections_current{state="active"} 2 nginx_connections_current{state="reading"} 0 nginx_connections_current{state="waiting"} 1 nginx_connections_current{state="writing"} 1

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©2018 Wantedly, Inc. HPA apiVersion: autoscaling/v2beta1 kind: HorizontalPodAutoscaler metadata: name: wantedly spec: maxReplicas: 50 minReplicas: 20 scaleTargetRef: apiVersion: apps/v1 kind: Deployment name: wantedly metrics: - type: Resource resource: name: cpu targetAverageUtilization: 50 - type: Pods pods: metricName: nginx_connections_current{state="writing"} targetAverageValue: 2.5 CPU ͱ Nginx ͷ  ଴ͪίωΫγϣϯͰεέʔϧ

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©2018 Wantedly, Inc. • Custom Metrics Λಋೖ͢Δ • CPU͚ͩͷͱ͖ΑΓޮ཰Α͘Φʔτεέʔϧ͕࢖͑Δ • ΞϓϦέʔγϣϯͷىಈΛૣ͘͢Δ • ͢͹΍͘εέʔϧͯ͠΋ىಈ͕஗͍ͱεύΠΫʹ͸উͯͳ͍ • API Server ͷΦϓγϣϯΛมߋ͢Δ • --horizontal-pod-autoscaler-sync-period • ϞχλϦϯάͰ͖Δ࢓૊Έ • Wantedly Ͱ͸ DataDog Λ࢖͍ͬͯΔ KubernetesͷΦʔτεέʔϧಋೖͷTips