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setup-service-mesh

pjt222
Updated 6 days ago
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Designaidesign

About

This skill deploys and configures Istio or Linkerd to add service mesh capabilities like mTLS, traffic routing, and observability to Kubernetes. It's used when microservices require secure communication, canary deployments, or unified policy enforcement without code changes. The process covers installation, configuration, and integration with monitoring tools.

Quick Install

Claude Code

Recommended
Primary
npx skills add pjt222/agent-almanac -a claude-code
Plugin CommandAlternative
/plugin add https://github.com/pjt222/agent-almanac
Git CloneAlternative
git clone https://github.com/pjt222/agent-almanac.git ~/.claude/skills/setup-service-mesh

Copy and paste this command in Claude Code to install this skill

Documentation

設服網

釋配服網為安服間通、流管、察、策強。

  • 微服需加密服間通→用
  • 需細流控(金釋、A/B、流分)→用
  • 需察諸服互動而不改應→用
  • 強安策(mTLS、授)於基設層→用
  • 一致行斷、重、超→用
  • 需散追與服依映→用

  • :Kubernetes 叢含管權
  • :服網選(Istio 或 Linkerd)
  • :所啟服網之名空
  • :察棧(Prometheus、Grafana、Jaeger)
  • :自流管需
  • :mTLS 之 CA 配

全配與板見 Extended Examples

一:裝服網控面

擇並裝服網控面。

Istio:

curl -L https://istio.io/downloadIstio | ISTIO_VERSION=1.20.2 sh -
istioctl install --set profile=production -y
kubectl get pods -n istio-system

Linkerd:

curl -sL https://run.linkerd.io/install | sh
linkerd check --pre
linkerd install --ha | kubectl apply -f -
linkerd check

建服網配含資源限與追:

# service-mesh-config.yaml (abbreviated)
spec:
  profile: production
  meshConfig:
    enableTracing: true
  components:
    pilot:
      k8s:
        resources: { requests: { cpu: 500m, memory: 2Gi } }

得:控面 pod 行於 istio-system 或 linkerd 名空。istioctl versionlinkerd version 示客服合本。

敗:

  • 察叢有足資源(產 ≥ 4 CPU、8GB RAM)
  • 驗 Kubernetes 本相容
  • 察日誌:kubectl logs -n istio-system -l app=istiodkubectl logs -n linkerd -l linkerd.io/control-plane-component=controller
  • 察衝 CRD:kubectl get crd | grep istiokubectl get crd | grep linkerd

二:啟自旁注

配名空為自旁代注。

Istio:

kubectl label namespace default istio-injection=enabled
kubectl get namespace -L istio-injection

Linkerd:

kubectl annotate namespace default linkerd.io/inject=enabled

測旁注樣釋:

# test-deployment.yaml (abbreviated)
apiVersion: apps/v1
kind: Deployment
spec:
  replicas: 2
  template:
    spec:
      containers:
      - name: app
        image: nginx:alpine

施驗:

kubectl apply -f test-deployment.yaml
kubectl get pods -n default
# Expect 2/2 containers

得:新 pod 示 2/2 容(應 + 旁代)。述出含 istio-proxy 或 linkerd-proxy 容。日示成代啟。

敗:

  • 察名空標:kubectl get ns default -o yaml
  • 驗變鉤活:kubectl get mutatingwebhookconfiguration
  • 察注日:kubectl logs -n istio-system -l app=sidecar-injector(Istio)
  • 手注測:kubectl get deploy test-app -o yaml | istioctl kube-inject -f - | kubectl apply -f -

三:配 mTLS 策

啟雙 TLS 為安服間通。

Istio:

# mtls-policy.yaml (abbreviated)
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: default
  namespace: istio-system
spec:
  mtls:
    mode: STRICT

Linkerd:

linkerd viz tap deploy/test-app -n default

施驗:

kubectl apply -f mtls-policy.yaml
istioctl authn tls-check $(kubectl get pod -n default -l app=test-app -o jsonpath='{.items[0].metadata.name}') -n default

得:諸網服間連示 mTLS 啟。Istio tls-check 示 STATUS 為「OK」。Linkerd tap 出示 🔒 於諸連。服日無 TLS 誤。

敗:

  • 察證簽:kubectl get certificates -A
  • 驗 CA 健:kubectl logs -n istio-system -l app=istiod | grep -i cert
  • 先測 PERMISSIVE 模再轉 STRICT
  • 察無旁服:kubectl get pods --all-namespaces -o json | jq '.items[] | select(.spec.containers | length == 1) | .metadata.name'

四:行流管則

配智流路、重、行斷。

# traffic-management.yaml (abbreviated)
apiVersion: networking.istio.io/v1beta1
kind: VirtualService
spec:
  http:
  - match:
    - uri: { prefix: /api/v2 }
    route:
    - destination: { host: api-service, subset: v2 }
      weight: 10
    - destination: { host: api-service, subset: v1 }
      weight: 90
    retries: { attempts: 3, perTryTimeout: 2s }

Linkerd 流分:

apiVersion: split.smi-spec.io/v1alpha2
kind: TrafficSplit
spec:
  service: api-service
  backends:
  - service: api-service-v1
    weight: 900
  - service: api-service-v2
    weight: 100

施測:

kubectl apply -f traffic-management.yaml
for i in {1..100}; do curl -s http://api.example.com/api/v2 | grep version; done | sort | uniq -c
istioctl dashboard kiali

得:流按定權分。行斷後續誤跳。重於暫敗發。Kiali/Linkerd 板示流可視。

敗:

  • 驗目主機解:kubectl get svc -n production
  • 察子標合 pod 標:kubectl get pods -n production --show-labels
  • 察 pilot 日:kubectl logs -n istio-system -l app=istiod
  • 先無行斷測再加
  • istioctl analyze -n production 查配

五:接察棧

連服網遙與察追系。

裝察附:

# Istio
kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.20/samples/addons/prometheus.yaml
kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.20/samples/addons/grafana.yaml
kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.20/samples/addons/kiali.yaml
kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.20/samples/addons/jaeger.yaml

# Linkerd
linkerd viz install | kubectl apply -f -
linkerd jaeger install | kubectl apply -f -

配自指與板:

# service-monitor.yaml (abbreviated)
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: istio-mesh-metrics
spec:
  selector: { matchLabels: { app: istiod } }
  endpoints:
  - port: http-monitoring
    interval: 30s

達板:

istioctl dashboard grafana
istioctl dashboard kiali
istioctl dashboard jaeger

得:板示服拓、請率、延分位、誤率。散追於 Jaeger 可。Prometheus 採網指成。自指現於詢。

敗:

  • 驗 Prometheus 採:kubectl get servicemonitor -A
  • 察附 pod 行:kubectl get pods -n istio-system
  • 察遙配:istioctl proxy-config log <pod-name> -n <namespace>
  • 驗網配啟追:kubectl get configmap istio -n istio-system -o yaml | grep -A 5 enableTracing
  • 察口衝若 port-forward 敗

六:驗察網健

行全健察設續察。

# Istio
istioctl analyze --all-namespaces
istioctl verify-install
istioctl proxy-status

# Linkerd
linkerd check
linkerd viz check
linkerd diagnostics policy

# Proxy sync
kubectl get pods -n production -o json | \
  jq '.items[] | {name: .metadata.name, proxy: .status.containerStatuses[] | select(.name=="istio-proxy").ready}'

# Control plane health
kubectl get pods -n istio-system -w
kubectl top pods -n istio-system

建健察本與警:

#!/bin/bash
# mesh-health-check.sh (abbreviated)
echo "=== Service Mesh Health Check ==="
kubectl get pods -n istio-system
istioctl analyze --all-namespaces

得:諸析察過無警。proxy-status 示諸代同步。mTLS 察確加密。指示流通。控面 pod 穩低資。

敗:

  • istioctl analyze 出之具題
  • 察單 pod 代日:kubectl logs <pod> -c istio-proxy -n <namespace>
  • 驗網策不阻網流
  • 察控面誤日:kubectl logs -n istio-system deploy/istiod --tail=100
  • 重啟問代:kubectl rollout restart deploy/<deployment> -n <namespace>

  • 控面 pod 行健(istiod/linkerd-controller)
  • 旁代注於諸應 pod(2/2 容)
  • mTLS 啟運(驗於 tls-check/tap)
  • 流管則正路請(驗以 curl)
  • 行斷於連敗跳(注故測)
  • 察板示指(Grafana/Kiali/Linkerd Viz)
  • 散追捕於 Jaeger
  • istioctl analyze/linkerd check 無警
  • 代同步示諸代同
  • 服間通加密(驗於日/板)

  • 資竭:服網每 pod 加 100-200MB 為旁。確叢有足容。注配設宜資限
  • 配衝:同主機多 VirtualService 致未定行。每主一 VirtualService 含多配
  • 證期:mTLS 證自轉而 CA 根需管。kubectl get certificate -A 察並設警
  • 旁未注:標前建之 pod 無旁。必重建:kubectl rollout restart deploy/<name> -n <namespace>
  • DNS 解問:服網截 DNS。跨名空用全限名(service.namespace.svc.cluster.local)
  • 口名需:Istio 需名口循協議名(如 http-web、tcp-db)。無名口默 TCP 通透
  • 漸釋需:勿產立啟 STRICT mTLS。遷時用 PERMISSIVE、驗諸服網、再轉 STRICT
  • 察負:100% 追採致性問題。產用 1-10%:sampling: 1.0 於網配
  • Gateway vs VirtualService 混:Gateway 配入(負衡)、VirtualService 配路。外流二需
  • 本相容:確網本相容 K8s 本。Istio 支 n-1 微本、Linkerd 常支末 3 K8s 本

  • configure-ingress-networking
  • deploy-to-kubernetes
  • setup-prometheus-monitoring
  • manage-kubernetes-secrets
  • enforce-policy-as-code

GitHub Repository

pjt222/agent-almanac
Path: i18n/wenyan-ultra/skills/setup-service-mesh
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