What is Ingress in OpenShift?

Ingress is a key component for exposing containerized applications to the outside world

Ingress is a component of OpenShift that allows you to expose your containerized applications to the outside world. It does this by routing incoming traffic to the appropriate container, based on the URL path.

To understand how Ingress works, let’s imagine that you have a website running on OpenShift. The website is hosted in a container, and you want to make it accessible to users on the internet.

To do this, you would create an Ingress resource in OpenShift. The Ingress resource would specify the URL path that you want to route traffic to, and the name of the container that you want to route traffic to. For example, the following Ingress resource would route all traffic to the / path to the my-website container.

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: my-website-ingress
spec:
  rules:
  - host: my-website.example.com
    http:
      paths:
      - path: /
        backend:
          serviceName: my-website
          servicePort: 80

Once you have created the Ingress resource, OpenShift will start routing traffic to the my-website container.

Benefits of using Ingress

There are a number of benefits to using Ingress in OpenShift. Here are a few of the most important ones:

• Centralized routing: Ingress allows you to centralize the routing of traffic to your containerized applications. This makes it easier to manage and scale your applications.
• Load balancing: Ingress can automatically load balance traffic across your containerized applications. This helps to improve the performance of your applications.
• Security: Ingress can help to secure your containerized applications by providing features such as SSL/TLS termination and authentication.
• Portability: Ingress is portable, so you can use it with any cloud provider or on-premises infrastructure.

How to get started with Ingress

If you’re interested in getting started with Ingress, there are a few different things you need to do. First, you need to install the Ingress Operator on your OpenShift cluster. The Ingress Operator is a service that manages Ingress resources for you.

Once you have installed the Ingress Operator, you can create Ingress resources in the OpenShift console or using the oc command-line tool.

What is a Ingress Operator?

An Ingress Operator in OpenShift is like your personal assistant for managing Ingress stuff. It takes care of all the nitty-gritty details of setting up and keeping your Ingress controllers running smoothly.

Basically, the Ingress Operator helps you easily create and manage Ingress resources without getting caught up in the technical complexities. It handles things like networking, load balancing, and SSL/TLS termination, so you don’t have to worry about them.

With the Ingress Operator, you can focus on setting up the rules for routing your applications and making sure they’re accessible to users on the internet. It takes care of all the background work, making your life a whole lot easier.

Long story short, the Ingress Operator in OpenShift makes it super easy to expose your containerized applications to the outside world. It’s like having a trusty sidekick to take care of all the Ingress stuff for you.

Conclusion

Ingress is a powerful tool that can help you to expose your containerized applications to the outside world. It is a key component of any OpenShift deployment, and it can help you to improve the performance, security, and portability of your applications.

Here are some questions that you might ask about Ingress:

• What are the different types of Ingress?
• How do I create an Ingress resource?
• How do I configure Ingress for load balancing?
• How do I secure Ingress with SSL/TLS termination?
• How do I use Ingress with a cloud provider?

What are the different types of Ingress in Openshift?

There are two main types of Ingress:

• Ingress controller: An Ingress controller is a software application that manages Ingress resources. The Ingress controller is responsible for routing incoming traffic to the appropriate container, based on the URL path.
• Ingress class: An Ingress class is a way to define the configuration for an Ingress controller. This can be used to create different Ingress controllers for different types of applications.

To create an Ingress resource, you can use the following command:

oc create -f ingress.yaml

The ingress.yaml file is a YAML file that defines the configuration for the Ingress resource. The following is an example of an Ingress resource that routes all traffic to the / path to the my-website container:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: my-website-ingress
spec:
  rules:
  - host: my-website.example.com
    http:
      paths:
      - path: /
        backend:
          serviceName: my-website
          servicePort: 80

How do I configure Ingress for load balancing in Openshift?

To configure Ingress for load balancing, you can use the loadBalancer field in the Ingress resource. The loadBalancer field specifies the type of load balancer that you want to use. For example, the following Ingress resource uses a RoundRobin load balancer:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: my-website-ingress
spec:
  loadBalancer:
    type: RoundRobin
  rules:
  - host: my-website.example.com
    http:
      paths:
      - path: /
        backend:
          serviceName: my-website
          servicePort: 80

How do I secure Ingress with SSL/TLS termination?

To secure Ingress with SSL/TLS termination, you can use the tls field in the Ingress resource. The tls field specifies the TLS configuration for the Ingress resource. For example, the following Ingress resource uses a self-signed certificate to terminate SSL/TLS:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: my-website-ingress
spec:
  tls:
  - hosts:
    - my-website.example.com
    secretName: my-website-tls
  rules:
  - host: my-website.example.com
    http:
      paths:
      - path: /
        backend:
          serviceName: my-website
          servicePort: 80

The secretName field specifies the name of the secret that contains the TLS certificate and key.

How do I use Ingress with a cloud provider?

To use Ingress with a cloud provider, you need to configure the Ingress controller to use the cloud provider’s load balancer. For example, to use the Google Cloud Load Balancing service, you would need to configure the Ingress controller to use the gcp Ingress class.

For more information on how to use Ingress with a cloud provider, please refer to the documentation for the cloud provider you are using.

I hope this blog post has given you a better understanding of Ingress in OpenShift. If you have any further questions, please feel free to leave a comment below.

TLDR

• Ingress is a component of OpenShift that allows you to expose your containerized applications to the outside world.
• Ingress provides a number of benefits, such as centralized routing, load balancing, security, and portability.
• To get started with Ingress, you need to install the Ingress Operator on your OpenShift cluster and create Ingress resources.