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This article introduces the relevant knowledge of "what matters needing attention in the technical selection of Kubernetes Ingress controller". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The development of Kubernetes has led to the rapid growth of its ecosystem. When creating new clusters or maintaining existing clusters, choosing the right Ingress controller will be an important decision.

Because there are a large number of components to choose from, it may be important to make the right choice. In this article, we will introduce the first factors you should consider in your decision-making process to avoid making any costly mistakes.

Traffic protocol support

The default Ingress resource is designed to support traffic based on the HTTP protocol. If your application needs support for other protocols, such as TCP and UDP, make sure that the Ingress controller supports the protocols required for a particular scenario.

Client management

If your application requires client-side management functions, such as rate limiting, throttling, and blocking, there are some Ingress controllers that can support these functions.

Traffic routing path selection

The Ingress controller can route traffic based on hostname and path. However, for those scenarios that need to be routed with something else, such as headers or query parameters, you will need to select an Ingress controller that supports this feature.

Elasticity

Is usability a key factor? Make sure that the Ingress controller has the right mechanisms in place to deal with the inevitable thorny situations you may encounter. For example, some ingress controllers support circuit breakers, which can take unhealthy services offline.

Load balancing algorithm

Traditionally, round-robin is the default algorithm for load balancing, and most Ingress controllers support this algorithm. However, if you need a different choice, the load balancing algorithm will be your determining factor.

Authentication

Some Ingress controllers support authentication management, which enables authentication management for all services exposed in the business flow without incurring the complexity of implementing the function in a single service layer.

Observability

Consider that the Ingress controller supports third-party software access records for monitoring and recording. Without this, there will be a lack of visibility into metrics and logs.

Kubernetes integration

If services and Kubernetes are needed in the future, it is critical to consider ensuring that the Ingress controller supports service integration. In addition, if you plan to use the service API (IngressV2), make sure that the controller you choose also supports this feature.

Flow distribution

Some Ingress controllers support different traffic allocation mechanisms. If your specific scenario requires the use of the A big B test or canary deployment to distribute traffic, make sure that the controller you are considering supports the desired distribution method.

Interface

Using a graphical interface is useful if you need to debug problems with Ingress resources or provide developers with useful information and metrics about the state of application activity.

Prompt

Using multiple Ingress controllers to solve the problem, a single Ingress controller may not be sufficient to cover all different scenarios in the same cluster. In this case, a combination of Ingress controllers can be used. For example, you might have one Ingress controller to handle external traffic routed to the cluster, and another Ingress controller to handle traffic within the cluster.

Each Ingress Controller must only deal with Ingress resources of its specific class. For Kubernetes

The ingressClassName field should be set to the class of the controller to be used by the 1.18reign resource

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