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在使用K8S的Ingress的时候需要我们自己来选择一个或者多个要使用的Ingress Controller。最常用的就是基于Nginx的Ingress控制器。但是很多人不清楚基于Nginx的控制器不止一种，而且使用上也是有不一致的。这就有必要在使用和遇到问题查阅文档、资料的时候知道自己用的是哪一个。查找的资料是不是对应的自己使用的Ingress 控制器实现。这就有了本篇翻译，希望可以让大家少走弯路。
背景
常见的两种基于Nginx的Ingress Controller实现：
-
kubernetes/ingress-nginx
-
nginxinc/kubernetes-ingress
NOTE：1 为kubernetes社区维护的版本 NOTE：再次强调，在查阅资料的时候一定注意是否是自己使用的Ingress Controller对应的文档。
判断自己使用的是哪个版本
可以通过检查自己的Ingress Controller使用的Docker镜像来区分。nginxinc/kubernetes-ingress Ingress控制器的Docker镜像在 DockerHub上就存在，名字是nginx/nginx-ingress.
不同Ingress 控制器的主要差别
下面的表格列举了不同版本的Ingress 控制器之间的差别。这里之所以出现了三种是因为基于Nginx商业版的nginx plus也有自己的一些特性。所以也一并列举了。
| 功能/特征 | kubernetes/ingress-nginx | nginxinc/kubernetes-ingress with NGINX | nginxinc/kubernetes-ingress with NGINX Plus |
|---|---|---|---|
| 基本信息 | |||
|
维护者 |
Kubernetes community | NGINX Inc and community | NGINX Inc and community |
| NGINX version | Custom NGINX build that includes several third-party modules | NGINX official mainline build | NGINX Plus |
| 商业支持 | N/A | N/A | Included |
| Ingress实例的LB相关设置 | |||
| Merging Ingress rules with the same host | Supported | Supported via Mergeable Ingresses | Supported via Mergeable Ingresses |
| HTTP load balancing extensions - Annotations | See the supported annotations | See the supported annotations | See the supported annotations |
| HTTP load balancing extensions -- ConfigMap | See the supported ConfigMap keys | See the supported ConfigMap keys | See the supported ConfigMap keys |
| TCP/UDP | Supported via a ConfigMap | Supported via a ConfigMap with native NGINX configuration | Supported via a ConfigMap with native NGINX configuration |
| Websocket | Supported | Supported via an annotation | Supported via an annotation |
| TCP SSL Passthrough | Supported via a ConfigMap | Not supported | Not supported |
| JWT validation | Not supported | Not supported | Supported |
| Session persistence | Supported via a third-party module | Not supported | Supported |
| Canary testing (by header, cookie, weight) | Supported via annotations | Supported via custom resources | Supported via custom resources |
| Configuration templates *1 | See the template | See the templates | See the templates |
| 基于CRD的扩展功能 | |||
| HTTP load balancing | Not supported | See VirtualServer and VirtualServerRoute resources. | See VirtualServer and VirtualServerRoute resources. |
| 部署方式 | |||
| Command-line arguments *2 | See the arguments | See the arguments | See the arguments |
| TLS certificate and key for the default server | Required as a command-line argument/ auto-generated | Required as a command-line argument | Required as a command-line argument |
| Helm chart | Supported | Supported | Supported |
| 运维相关 | |||
| Reporting the IP address(es) of the Ingress controller into Ingress resources | Supported | Supported | Supported |
| Extended Status | Supported via a third-party module | Not supported | Supported |
| Prometheus Integration | Supported | Supported | Supported |
| Dynamic reconfiguration of endpoints (no configuration reloading) | Supported with a third-party Lua module | Not supported | Supported |
Notes:
*1 -- 不同的Ingress控制器使用的Configuration templates格式是不同的.
*2 -- 由于命令行参数存在差别，所以不同的Ingress控制器的部署配置文件（deployment manifest）也是各不相同的。
更换Ingress 控制器
需要根据上面章节描述的各个方面来处理差异。选择合适您场景的Ingress 控制器。
参考文献
https://github.com/nginxinc/kubernetes-ingress/blob/master/docs/nginx-ingress-controllers.md