Chapter 11. Configuring ingress cluster traffic

11.1. Configuring ingress cluster traffic overview
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OpenShift Container Platform provides the following methods for communicating from outside the cluster with services running in the cluster.

The methods are recommended, in order or preference:

If you have HTTP/HTTPS, use an Ingress Controller.
If you have a TLS-encrypted protocol other than HTTPS. For example, for TLS with the SNI header, use an Ingress Controller.
Otherwise, use a Load Balancer, an External IP, or a NodePort.

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Method	Purpose
Use an Ingress Controller	Allows access to HTTP/HTTPS traffic and TLS-encrypted protocols other than HTTPS (for example, TLS with the SNI header).
Automatically assign an external IP using a load balancer service	Allows traffic to non-standard ports through an IP address assigned from a pool.
Manually assign an external IP to a service	Allows traffic to non-standard ports through a specific IP address.
Configure a `NodePort`	Expose a service on all nodes in the cluster.

As a cluster administrator, you can designate an IP address block that is external to the cluster that can send traffic to services in the cluster.

This functionality is generally most useful for clusters installed on bare-metal hardware.

Your network infrastructure must route traffic for the external IP addresses to your cluster.

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