K3s 配置 Traefik Ingress

启用Dashboard

默认情况下，K3s 1.20 及更早版本默认安装 Traefik v1，并且默认没有启用 Traefik Dashboard。如果要在 K3s 中启用 Traefik v1 的 Dashborad，我们可以借助 HelmChartConfig 来自定义由 Helm 部署的 Traefik v1 并启用 Dashboard.

不建议手动编辑 /var/lib/rancher/K3s/server/manifests/traefik.yaml 来修改 Traefik 配置文件，因为 K3s 重启后会覆盖修改的内容。

建议通过在 /var/lib/rancher/K3s/server/manifests 中创建一个额外的 HelmChartConfig 清单来自定义 Traefik 配置，请参考：http://docs.rancher.cn/docs/K3

cat >> /var/lib/rancher/K3s/server/manifests/traefik-config.yaml << EOF
apiVersion: helm.cattle.io/v1
kind: HelmChartConfig
metadata:
  name: traefik
  namespace: kube-system
spec:
  valuesContent: |-
    dashboard:
      enabled: true
    ports:
      traefik:
        expose: true
    logs:
      access:
        enabled: true
EOF

配置Service及路由规则

此方法适用于traefik2.x

cat >> traefik-dashboard.yaml << EOF
apiVersion: v1
kind: Service
metadata:
  name: traefik
  namespace: kube-system 
spec:
  allocateLoadBalancerNodePorts: true
  ports:
  - name: web
    nodePort: 80
    port: 80
    protocol: TCP
    targetPort: web
  - name: websecure
    nodePort: 443
    port: 443
    protocol: TCP
    targetPort: websecure
  selector:
    app.kubernetes.io/instance: traefik-kube-system
    app.kubernetes.io/name: traefik
  type: LoadBalancer

---

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: traefik-dashboard-web
spec:
  entryPoints:
    - web
  routes:
    - kind: Rule
      match: PathPrefix(`/dashboard`) || PathPrefix(`/api`)
      services:
        - name: api@internal
          kind: TraefikService

---

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: traefik-dashboard-websecure
spec:
  entryPoints:
    - websecure
  routes:
    - kind: Rule
      match: PathPrefix(`/dashboard`) || PathPrefix(`/api`)
      services:
        - name: api@internal
          kind: TraefikService
  tls:
    secretName: traefik-dashboard-tls
EOF

1	kubectl apply -f traefik-dashboard.yaml

[^注意]: 访问Dashboard需要在最后加一个/ 否则可能出现page not found

配置IngressRoute

1
2
3

# 搭建测试环境
kubectl create deploy whoami --image=traefik/whoami --replicas=2
kubectl expose deploy whoami --port=80

HTTP

#whoami-no-tls-ingress-route.yaml 
apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  name: whoami-ingress-web
  namespace: default
spec:
  entryPoints:
    - web
  routes:
    - match: Host(`192.168.0.202`) && PathPrefix(`/notls`)
      kind: Rule
      services:
        - name: whoami
          port: 80

HTTPS

# 用 openssl 来创建一个自签名的证书
openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=domain.example.com"

kubectl create secret tls whoami-tls --cert=tls.crt --key=tls.key

# whoami-tls-ingress-route.yaml
apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  name: whoami-ingress-websecure
  namespace: default
spec:
  entryPoints:
    - websecure
  routes:
    - match: Host(`192.168.0.202`) && PathPrefix(`/tls`)
      kind: Rule
      services:
        - name: whoami
          port: 80
  tls:
    secretName: whoami-tls

TCP/UDP

apiVersion: traefik.containo.us/v1alpha1
kind: IngressRouteTCP #IngressRouteUDP
metadata:
  name: redis
  namespace: devops
spec:
  entryPoints:
    - redis
  routes:
  - match: HostSNI(`*`)
    services:
    - name: redis
      port: 6379

TCP Routers与HTTP Routers的routes有所不同：

TCP Routers match采用HostSNI,而HTTP Routers match直接匹配Host。
TCP Routers只能定位TCP服务（不能定位HTTP服务）。
如果HTTP Routers和TCP Routers都侦听相同的入口点，则TCP Routers将在HTTP Routers之前应用。如果找不到与TCP Routers匹配的路由，则HTTP Routers将接管。

参考

K3s版本 > v.121(Traefik 2.x)

K3S 中 Traefik v2 安装及采坑纪实 - 知乎 (zhihu.com)

k3s开启traefik的dashboard网页-CSDN博客

Step by Step！教你如何在k3s集群上使用Traefik 2.x - k3s中文社区 - 博客园 (cnblogs.com)

traefik系列之一 | 简介、部署和配置-腾讯云开发者社区-腾讯云 (tencent.com)

还不会Traefik？看这篇文章就够了！ - 知乎 (zhihu.com)

k3s 使用 Letsencrypt 和 Traefik 完成 https 入口部署-腾讯云开发者社区-腾讯云 (tencent.com)

[Kubernetes环境Traefik部署与应用 - Tiscs - 博客园 (cnblogs.com)](https://www.cnblogs.com/tiscs/p/notes-k8s-traefik.html#:~:text=安装Traefik 1 配置 Helm Repo helm repo add, … 3 其他准备工作获取 traefik 服务的负载均衡器地址。 )

Traefik - Kubernetes 配置TCP/HTTP服务-腾讯云开发者社区-腾讯云 (tencent.com)

cert-manager管理内网k8s开发环境证书 - hueidou163 - 博客园 (cnblogs.com)

Kubernetes (K8S)中Traefik路由(ingressRoute)-腾讯云开发者社区-腾讯云 (tencent.com)

K3s版本 < v.121(Traefik 1.x)

基础指南：如何在K3s中配置Traefik? - k3s中文社区 - 博客园 (cnblogs.com)

K3s 集群如何使用 Traefik_k3s traefik-CSDN博客

k3s 使用 Letsencrypt 和 Traefik 完成 https 入口部署-腾讯云开发者社区-腾讯云 (tencent.com)

Kubernetes 集群部署 Ingress Traefik-腾讯云开发者社区-腾讯云 (tencent.com)

Dashboard无法访问问题参考

如何在 K3s 中启用 Traefik Dashborad - RancherLabs - 博客园 (cnblogs.com)

How to Expose and Enable K3s with Traefik Dashboard (thriveread.com)

kubernetes - How to expose traefik v2 dashboard in k3d/k3s via configuration? - Stack Overflow