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Monitoring Containerized Elixir
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さっちゃん
September 07, 2019
Programming
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Monitoring Containerized Elixir
#ElixirConfJP #CastleConf
さっちゃん
September 07, 2019
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Transcript
Monitoring Containerized Elixir
.。oO(さっちゃんですよヾ(〃l _ l)ノ゙☆) @ Mackerel.io / Hatena.ne.jp
Imagine, you have a great Elixir app.
Imagine, you have a great Elixir app. And will be
working it on Docker
Imagine, you have a great Elixir app. And will be
working it on Docker on Kubernetes.
Why container, Docker? Container is an abstract layer over infrastructure.
It runs everywhere. It easy to create, share, transfer & run.
Why Kubernetes? K8s is a common language. K8s can run
every types of applications.
Elixir on Containers https://speakerdeck.com/ne_sachirou/elixir-on- containers s/:distillery/Mix.Release/
When you've deployed the app on K8s. How to monitor
it?
Why Monitoring? Is your app works well? Know how your
app works. What caused when your app is broken. Keep your app observable.
Liveness check Is your app is living or not?
K8s has liveness probe. --- apiVersion: apps/v1 kind: Deployment spec:
template: spec: containers: - name: app livenessProbe: httpGet: path: /ops/heartbeat port: 4000
How to check your app is live or not?
KomachiHeartbeat https://hex.pm/packages/komachi_heartbeat Vital monitoring Elixir Web application.
KomachiHeartbeat The name is originate from a great Rubygems :
https://rubygems.org/gems/komachi_heartbeat
Add KomachiHeartbeat. defmodule Example.Router do use Plug.Router plug(:match) plug(:dispatch) forward("/ops",
to: KomachiHeartbeat) end defmodule ExampleWeb.Router do use ExampleWeb, :router forward("/ops", KomachiHeartbeat) end
Check it. % curl http://localhost/ops/heartbeat heartbeat:ok Also available from Zabbix,
ALB health check or Mackerel's "External Http monitor (外形監視)".
Error collection Listening canary song.
Sentry https://sentry.io/ Collect & sort errors. Show the error environments:
stacktrace, HTTP params, app host, release ver… Assign & resolve issue. Integrate with Sass: Slack, GitHub…
Add https://hex.pm/packages/sentry in your app. defmodule Example.Application do use Application
def start(_type, _args) do Logger.add_backend(Sentry.LoggerBackend) … end defmodule Example.Router do use Sentry.Plug … end & add many metadata, by yourself (・﹏・)
Metrics monitoring Know the app behaviour & detect anomary.
Prometheus + Grafana + deadtrickster/beam-dashboards Beautiful. But to keep Prometheus
servers have many toils.
Mackerel https://mackerel.io
Add mackerel-container-agent as a sidecar. --- apiVersion: apps/v1 kind: Deployment
spec: template: spec: containers: - name: app … - name: mackerel-container-agent image: mackerel/mackerel-container-agent:latest imagePullPolicy: Always resources: limits: {memory: 128Mi} env: - {name: MACKEREL_CONTAINER_PLATFORM, value: kubernetes} - name: MACKEREL_KUBERNETES_KUBELET_HOST valueFrom: fieldRef: fieldPath: status.hostIP - name: MACKEREL_KUBERNETES_NAMESPACE valueFrom: fieldRef: {fieldPath: metadata.namespace} - name: MACKEREL_KUBERNETES_POD_NAME valueFrom: fieldRef: {fieldPath: metadata.name} - {name: MACKEREL_ROLES, value: example:app} envFrom: - secretRef: {name: mackerel}
apiVersion: kustomize.config.k8s.io/v1beta1 kind: Kustomization … secretGenerator: - name: mackerel type:
Opaque files: [MACKEREL_APIKEY=secret/MACKEREL_APIKEY]
None
OK. I see container's metrics. How about BEAM metrics?
KomachiHeartbeat + mackerel- plugin-json https://hex.pm/packages/komachi_heartbeat Vital monitoring Elixir Web application.
https://github.com/mackerelio/mackerel-plugin-json Json custom metrics plugin for mackerel.io agent.
KomachiHeartbeat has /stats endpoint that returns app's stats in JSON.
mackerel-plugin-json posts any data gotten from JSON API as Mackerel custome metrics.
We have KomachiHeartbeat.BeamVital . https://github.com/ne- sachirou/ex_komachi_heartbeat/pull/29 (Sorry for under development.)
Add KomachiHeartbeat.BeamVital . defmodule TeijiBot.Router do use Plug.Router plug(:match) plug(:dispatch)
forward( "/ops", to: KomachiHeartbeat, init_opts: [vitals: [KomachiHeartbeat.BeamVital]] ) end
Configure mackerel-plugin-json. --- apiVersion: apps/v1 kind: Deployment spec: template: spec:
volumes: - name: mackerel-agent-config configMap: name: mackerel-agent-config containers: - name: app … - name: mackerel-container-agent image: mackerel/mackerel-container-agent:plugins … env: - {name: MACKEREL_AGENT_CONFIG, value: /etc/mackerel/mackerel.yaml} … volumeMounts: - name: mackerel-agent-config mountPath: /etc/mackerel readOnly: true
--- apiVersion: v1 kind: ConfigMap metadata: name: mackerel-agent-config data: mackerel.yaml:
| plugin: metrics: json: command: | mackerel-plugin-json \ -url="http://localhost:4000/ops/stats" \ -prefix='beam'
None
Current metrics : atom_count memory_ets_tables memory_system_bytes_total atom, binary, code, ets,
other port_count process_count (More, under development.)