使用Ingress-Nginx来暴露ArgoCD Web-UI

1. 查看Argocd Service

可以看到是ClusterIP，因此不能从外部直接访问Argocd的WEB-UI

# kubectl get svc -n argocd
NAME                                      TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
argocd-applicationset-controller          ClusterIP   10.96.52.109    <none>        7000/TCP,8080/TCP            25d
argocd-dex-server                         ClusterIP   10.96.57.217    <none>        5556/TCP,5557/TCP,5558/TCP   25d
argocd-metrics                            ClusterIP   10.96.153.115   <none>        8082/TCP                     25d
argocd-notifications-controller-metrics   ClusterIP   10.96.207.83    <none>        9001/TCP                     25d
argocd-redis                              ClusterIP   10.96.112.222   <none>        6379/TCP                     25d
argocd-repo-server                        ClusterIP   10.96.240.85    <none>        8081/TCP,8084/TCP            25d
argocd-server                             ClusterIP   10.96.65.68     <none>        80/TCP,443/TCP               25d
argocd-server-metrics                     ClusterIP   10.96.16.178    <none>        8083/TCP                     25ds

2. 检查Ingress控制器是否正常。

打算使用ingress-nginx来暴露应用，也可以使用Traefik等。

# kubectl get pods -n ingress-nginx
NAME                             READY   STATUS    RESTARTS         AGE
ingress-nginx-controller-bnmpt   1/1     Running   26               25d
ingress-nginx-controller-cfblk   1/1     Running   28 (5d23h ago)   25d

3. 查看Secret

# kubectl get secret -n argocd
NAME                                           TYPE                                  DATA   AGE
argocd-application-controller-token-f9qj7      kubernetes.io/service-account-token   3      25d
argocd-applicationset-controller-token-r5vqk   kubernetes.io/service-account-token   3      25d
argocd-dex-server-token-hzwkt                  kubernetes.io/service-account-token   3      25d
argocd-initial-admin-secret                    Opaque                                1      25d
argocd-notifications-controller-token-75csv    kubernetes.io/service-account-token   3      25d
argocd-notifications-secret                    Opaque                                0      25d
argocd-redis-token-78522                       kubernetes.io/service-account-token   3      25d
argocd-repo-server-token-6f2x9                 kubernetes.io/service-account-token   3      25d
argocd-secret                                  Opaque                                5      25d

4. 配置Ingress规则。

# cat argocd-ingress.yaml 
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: argocd-server-ingress
  namespace: argocd
  annotations:
    nginx.io/tls-acme: "true"
    nginx.ingress.kubernetes.io/backend-protocol: "HTTPS" # 后端使用tls协议，设置代理后端服务器的代理协议类型，默认为 HTTP
    nginx.ingress.kubernetes.io/force-ssl-redirect: "true" # 设置当前虚拟主机支持 HTTPS 请求时，是否将 HTTP 的请求强制跳转到 HTTPS 端口，全局默认为 true
    nginx.ingress.kubernetes.io/ssl-passthrough: "true" # ssl透传
spec:
  ingressClassName: nginx    # 使用 nginx 的 IngressClass（关联的 ingress-nginx 控制器）
  rules:     # 规则
    - host: argocd.k8s.local    # 虚拟主机的FQDN
      http:
        paths:
          - path: /
            pathType: Prefix    # Prefix前缀匹配
            backend:
              service:
                name: argocd-server
                port:
                  name: https
  tls:    # 配置 tls 证书
  - hosts:
    - argocd.k8s.local
    secretName: argocd-secret   "引用的secret"
# kubectl apply -f argocd-ingress.yaml 
ingress.networking.k8s.io/argocd-server-ingress unchanged

5. 查看Ingress配置

不过需要注意大部分Ingress控制器都不是直接转发到Service
而是只是通过Service来获取后端的Endpoints列表，直接转发到Pod，这样可以减少网络跳转，提高性能。

# kubectl get ingress -n argocd
NAME                    CLASS   HOSTS              ADDRESS               PORTS     AGE
argocd-server-ingress   nginx   argocd.k8s.local   10.0.0.11,10.0.0.12   80, 443   24d

# kubectl describe ingress argocd-server-ingress -n argocd
Name:             argocd-server-ingress
Namespace:        argocd
Address:          xxxxxxxx
Default backend:  default-http-backend:80 (<error: endpoints "default-http-backend" not found>)
TLS:
  argocd-secret terminates argocd.k8s.local
Rules:
  Host              Path  Backends
  ----              ----  --------
  argocd.k8s.local  
                    /   argocd-server:https (192.168.2.49:8080)
Annotations:        nginx.ingress.kubernetes.io/backend-protocol: HTTPS
                    nginx.ingress.kubernetes.io/force-ssl-redirect: true
                    nginx.ingress.kubernetes.io/ssl-passthrough: true
                    nginx.io/tls-acme: true
Events:             <none>