社内勉強会の発表資料です。 Feb 27, 2019

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Kubernetes Monitoring
Introduction
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Kyohei Mizumoto(@kyohmizu)
C# Software Engineer
Interests
Docker/Kubernetes
Go
Security
whoami
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Required
Kubernetesの概要程度の知識
Targets
Kubernetes Monitoring未経験者
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Contents
1. Monitoring Overview
2. Datadog
3. Prometheus
4. Demo
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Monitoring Overview
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Monitoring
Problem Detection
ダッシュボード、アラート
Problem Resolution
根本原因の特定、トラブルシュート
Continuous Improvement
キャパシティ、コスト最適化
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Observability
A measure of how well internal states of a system can be
inferred from knowledge of its external outputs
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Landscape
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Tools
Datadog
Prometheus
Managed Service
Azure Monitor for containers
Stackdriver(for GKE)
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Tools
Datadog
Prometheus
Managed Service
Azure Monitor for containers
Stackdriver(for GKE)
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Datadog
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SaaS型の監視＆解析ツール
課⾦制
様々なサービスのメトリクスをシー
ムレスに集約
Datadog
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Dashboard
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Metrics
ホストのCPU使⽤率、ディスク使⽤率
ノード上のコンテナのCPU使⽤率
Deployment のPod数、要求起動数
Jobの成功数、失敗数
etc...
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Prometheus
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CNCFがホストするOSSの監視ツー
ル
時系列でメトリクスを収集
Reliability
Prometheus
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Architecture
pull metrics
HDD / SSD
Pushgateway
Short-lived jobs
Jobs / Exporters
StorageRetrieval PromQL
Prometheus Server
Node
Service Discovery
find
targets
Prometheus Server
Alertmanager
push alerts
Web UI
Grafana
API clients
PagerDuty Email
DNS
Kubernetes
Consul
...
Custom integration
notify
...
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Architecture
Prometheus Server
メトリクスの収集(Pull型)、保存
Alert Manager
Exporter
要求に応じてメトリクスを送信
Push Gateway
メトリクスをPushしておく
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Get Started
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Use Helm
Helmを使⽤してマニフェストを作成
公式サイト︓https://helm.sh/
# Chartのダウンロード
$ helm fetch stable/prometheus --version 8.8.0
# Chartを元にマニフェストを作成
$ helm template --name sample-prometheus
prometheus-8.8.0.tgz
> sample-prometheus.yaml
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Values
LBとして外部に公開する場合は、valuesファイルを⽤意
しておく
alertmanager:
service:
type: LoadBalancer
pushgateway:
service:
type: LoadBalancer
server:
service:
type: LoadBalancer
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Deploy
サンプルをデプロイ
https://github.com/Kyohei-M/slide-k8s-monitoring/blob/master/sample-
prometheus.yaml
# Prometheusを起動
$ kubectl apply -f sample-prometheus.yaml
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Demo
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Prometheus Server
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Prometheus Server
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PromQL
Prometheus Query Language
# Example
# apiserverのhttpリクエスト合計
http_requests_total{job="apiserver"}
# 直近5分のhttpリクエストの増加率
rate(http_requests_total[5m])[30m:1m]
# 直近1時間での空きメモリ量の差
delta(node_memory_MemFree_bytes[1h])
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Grafana
OSSのデータ可視化ツール
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Grafana
helmでインストール
$ helm install stable/grafana
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Books
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Links
Monitoring and Observability
https://thenewstack.io/monitoring-and-observability-whats-the-
difference-and-why-does-it-matter/
Datadog
https://www.datadoghq.com/
Prometheus
https://prometheus.io/
Grafana
https://grafana.com/
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Thank you!
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