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# K8S Ingress/Ingress Controller

# 介紹

# Ingress

定義規則

Ingress 是 K8s 所提供的工具，用在定義應用程式如何公開服務

# Ingress Controller

實現規則與分流

Ingress Controller 負責監聽 Ingress 管理路由 Nginx 等，Ingress Controller 會根據 Ingress Controler 分配流量到應用程式

# 實作

# 建立 Ingress

手上有三個 service

  1. efk-elasticsearch-client
  2. efk-kibana
  3. hl
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apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress
  annotations:
    kubernetes.io/ingress.class: "traefik"
    traefik.ingress.kubernetes.io/frontend-entry-points: http,https
    #traefik.ingress.kubernetes.io/redirect-entry-point: https
    #traefik.ingress.kubernetes.io/redirect-permanent: "true"
spec:
  ingressClassName: traefik
  rules:
    - http:
        paths:
        - path: /es
          pathType: Prefix
          backend:
            service:
              name: efk-elasticsearch-client
              port:
                number: 9200
        - path: /kb
          pathType: Prefix
          backend:
            service:
              name: efk-kibana
              port:
                number: 443
        - path: /
          pathType: Exact
          backend:
            service:
              name: hl
              port:
                number: 8080


# 建立 Ingress Controller

1
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.5.1/deploy/static/provider/cloud/deploy.yaml

一旦更新或刪除 Ingress 資源，Nginx Ingress Controller 會自動響應並相應地更新或刪除相關的路由規則。

# 參考資料