# Traefik Ingress Controller

我们在前面部署了 [Traefik](https://traefik.io) 作为 Ingress Controller，如果集群外部直接访问 Kubenetes 内部服务的话，可以直接创建 Ingress 如下所示：

```yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: traefik-ingress
  namespace: default
spec:
  rules:
  - host: traefik.nginx.io
    http:
      paths:
      - path: /
        backend:
          serviceName: my-nginx
          servicePort: 80
```

## Traefik Ingress Controller

当我们处于迁移应用到 Kubernetes 上的阶段时，可能有部分服务实例不在 Kubernetes上，服务的路由使用 Nginx 配置，这时处于 nginx 和 ingress 共存的状态。参考下面的配置：

```yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: td-ingress
  namespace: default
  annotations:
    traefik.frontend.rule.type: PathPrefixStrip
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host: "*.jimmysong.io"
    http:
      paths:
      - path: /docGenerate
        backend:
          serviceName: td-sdmk-docgenerate
          servicePort: 80
```

注意 **annotation** 的配置：

* `traefik.frontend.rule.type: PathPrefixStrip`：表示将截掉 URL 中的 `path`
* `kubernetes.io/ingress.class`：表示使用的 ingress 类型

在 Nginx 中增加配置：

```ini
upstream docGenerate {
       server 172.20.0.119:80;
       keepalive 200;
    }
```

172.20.0.119 是我们的边缘节点的 VIP，见[边缘节点配置](/kubernetes-handbook/zui-jia-shi-jian/service-discovery-and-loadbalancing/edge-node-configuration.md)。


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