Architecture Intermediate

Sidecar Pattern — Extension Without Code Changes¶

SidecarService MeshKubernetes 3 min read

Sidecar kontejner pro cross-cutting concerns. Logging, monitoring, service mesh.

What is Sidecar?¶

Pomocný kontejner runscí vedle hlavní application ve stejném podu. Přidává funkcionalitu without changes code.

• Proxy pro síťovou komunikaci (Envoy, Istio)
• Log collection (Fluentd)
• Monitoring agent
• TLS terminace

Kubernetes example¶

apiVersion: v1
kind: Pod
metadata:
  name: myapp
spec:
  containers:
    - name: app
      image: myapp:latest
      ports: [{containerPort: 8080}]
    - name: log-collector
      image: fluentd:latest
      volumeMounts: [{name: logs, mountPath: /var/log/app}]
    - name: envoy
      image: envoyproxy/envoy:latest
  volumes:
    - name: logs
      emptyDir: {}

Service Mesh¶

Istio/Linkerd = sidecar pattern v měřítku. Every service dostane sidecar proxy pro mTLS, traffic management, observability.

Summary¶

Sidecar is the de facto standard v Kubernetes. Elegantní způsob addsní infrastrukturních funkcí.

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