Skip to content

Latest commit

 

History

History
57 lines (37 loc) · 2.37 KB

ingress.md

File metadata and controls

57 lines (37 loc) · 2.37 KB

Ingress

Load Balancer and Ingress

Introduction

Kubernetes provides a variety of mechanisms to expose pods in your cluster to external networks. Two key concepts for routing traffic to your services are:

  • Load Balancers, which expose an external IP and route traffic to one or more pods inside the cluster.
  • Ingress controllers, which provide a mapping between external HTTP routes and internal services. Ingress controllers are typically exposed using a Load Balancer external IP.

DeepOps provides scripts you can run to configure a simple Load Balancer and/or Ingress setup:

Load Balancer

Modify config/helm/metallb.yml to configure the IP range that the load balancer will hand out.

Run the script to deploy the load balancer:

./scripts/k8s/deploy_loadbalancer.sh

This script will set up a software-based L2 Load Balancer using MetalLb

Ingress controller

By default the Ingress controller will be assigned an external IP managed by the Load Balancer.

If you do not have control over your subnet to assign IPs to the load balancer, you can expose ingress routes on specific ports and access them via the IP of any management node. To do this, modify config/helm/ingress.yml and set the service type to NodePort.

Run the script to deploy the Ingress controller:

./scripts/k8s/deploy_ingress.sh

This script will set up an Ingress controller based on NGINX.

The different examples and optional services included with DeepOps may use different mechanisms to provide external access. Depending on the config, each may:

  • Use an Ingress to get an HTTP route on the shared NGINX IP.
  • Use the Load Balancer directly and get their own external IP.
  • Use a NodePort config to expose themselves via a local port on the actual nodes.

For more detail on Kubernetes networking, and the different ways that services can be accessed, see the official documentation on service networking concepts.