EggJS 云原生应用硬核实战（Kubernetes+Traefik+Helm+Prometheus+Grafana）

curl -X POST http://localhost:7001/api/posts --data '{"title":"post1", "content": "post1 content"}' --header 'Content-Type:application/json; charset=UTF-8'

curl -X POST http://localhost:7001/api/topics --data '{"title":"topic1", "content": "topic1 content"}' --header 'Content-Type:application/json; charset=UTF-8'

"start": "egg-scripts start --workers=1 --title=egg-server-k8s-eggjs-promethues",

FROM node:15-alpine
RUN ln -sf /usr/share/zoneinfo/Asia/ShangHai /etc/localtime
RUN echo "Asia/Shanghai" > /etc/timezone
COPY package.json /app/dependencies/package.json
COPY yarn.lock /app/dependencies/yarn.lock
RUN cd /app/dependencies \
    && yarn install --frozen-lockfile --registry=https://registry.npm.taobao.org \
    && yarn cache clean \
    && mkdir /app/egg \
    && ln -s /app/dependencies/node_modules /app/egg/node_modules
COPY ./ /app/egg/
WORKDIR /app/egg
EXPOSE 7001
CMD npm run start

docker build -f docker/Dockerfile.prod -t k8s-eggjs-promethues:1.0.0 .  --no-cache

docker tag k8s-eggjs-promethues:1.0.0 registry.cn-shenzhen.aliyuncs.com/hacker-linner/k8s-eggjs-promethues:1.0.0

docker push registry.cn-shenzhen.aliyuncs.com/hacker-linner/k8s-eggjs-promethues:1.0.0

mkdir k8s-helm-charts && cd k8s-helm-charts
helm create k8seggjs

replicaCount: 3 # 部署副本我用3个实例做负载均衡，保证服务可用
image:
  repository: registry.cn-shenzhen.aliyuncs.com/hacker-linner/k8s-eggjs-promethues # 镜像变为刚上传
  pullPolicy: Always # 镜像拉取策略可直接用默认`IfNotPresent`
# apiPort，metricsPort 默认模板没有，
# 这里我对 template 里面的 ingress.yaml service.yaml deployment.yaml 文件做了相应改动
service:
  type: ClusterIP
  apiPort: 7001 # 这个 API 服务的端口
  metricsPort: 7777 # 这个是 prometheus 所需的 metrics 端口
# Ingress Controller，根据你的环境决定，我这里用的是 traefik
ingress:
  enabled: true
  annotations:
    ingress.kubernetes.io/ssl-redirect: "true"
    ingress.kubernetes.io/proxy-body-size: "0"
    kubernetes.io/ingress.class: "traefik"
    traefik.ingress.kubernetes.io/router.tls: "true"
    traefik.ingress.kubernetes.io/router.entrypoints: websecure
  hosts:
    - host: k8seggjs.hacker-linner.com
      paths:
        - /
  tls:
    - secretName: hacker-linner-cert-tls
      hosts:
# 做资源限制，防止内存泄漏，交给 K8S 杀掉然后重启，保证服务可用
resources:
  limits:
    cpu: 100m
    memory: 128Mi
  requests:
    cpu: 100m
    memory: 128Mi

kubectl create ns k8seggjs

helm install k8seggjs ./k8seggjs -f values.yaml -n k8seggjs
# 卸载：helm uninstall k8seggjs -n k8seggjs

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleList
items:
- apiVersion: rbac.authorization.k8s.io/v1
  kind: Role
  metadata:
    name: prometheus-k8s-k8seggjs
    namespace: k8seggjs
  rules:
  - apiGroups:
    - ""
    resources:
    - services
    - endpoints
    - pods
    verbs:
    - get
    - list
    - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBindingList
items:
- apiVersion: rbac.authorization.k8s.io/v1
  kind: RoleBinding
  metadata:
    name: prometheus-k8s-k8seggjs
    namespace: k8seggjs
  roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: Role
    name: prometheus-k8s-k8seggjs
  subjects:
  - kind: ServiceAccount
    name: prometheus-k8s
    namespace: monitoring

apiVersion: v1
kind: Service
metadata:
  namespace: k8seggjs
  name: k8seggjs-metrics
  labels:
    k8s-app: k8seggjs-metrics
  annotations:
    prometheus.io/scrape: 'true'
    prometheus.io/scheme: http
    prometheus.io/path: /metrics
    prometheus.io/port: "7777"
spec:
  selector:
    app.kubernetes.io/name: k8seggjs
  ports:
  - name: k8seggjs-metrics
    port: 7777
    targetPort: 7777
    protocol: TCP

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: k8seggjs
  namespace: monitoring
spec:
  endpoints:
  - bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
    interval: 5s
    port: k8seggjs-metrics
  jobLabel: k8s-app
  namespaceSelector:
    matchNames:
    - k8seggjs
  selector:
    matchLabels:
      k8s-app: k8seggjs-metrics

kubectl apply -f ServiceMonitor.yaml

config.exporter = {
  scrapePort: 7777,
  scrapePath: '/metrics',
  prefix: 'k8seggjs_',
  defaultLabels: { stage: process.env.NODE_ENV },
};