Overview

AWS Load Balancer Controller is a controller to help manage Elastic Load Balancers for a Kubernetes cluster.

When you create a Kubernetes ingress, an AWS Application Load Balancer (ALB) is provisioned that load balances application traffic. To learn more, see What is an Application Load Balancer? in the Application Load Balancers User Guide and Ingress in the Kubernetes documentation. ALBs can be used with pods that are deployed to nodes or to AWS Fargate. You can deploy an ALB to public or private subnets.

• Application Load Balancer - It satisfies Kubernetes Ingress resources by provisioning Application Load Balancers
• Network Load Balancer - It satisfies Kubernetes Service resources by provisioning Network Load Balancers.

How it works (Application Load Balancer)

• The following diagram details the AWS components this controller creates. It also demonstrates the route ingress traffic takes from the ALB to the Kubernetes cluster.

Example manifest to provision a load balancer (kubectl apply -f example_below.yaml)

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deployment-2048
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: app-2048
  replicas: 1
  template:
    metadata:
      labels:
        app.kubernetes.io/name: app-2048
    spec:
      containers:
      - image: public.ecr.aws/l6m2t8p7/docker-2048:latest
        imagePullPolicy: Always
        name: app-2048
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: service-2048
spec:
  ports:
    - port: 80
      targetPort: 80
      protocol: TCP
  type: NodePort
  selector:
    app.kubernetes.io/name: app-2048
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-2048
  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/target-type: ip
spec:
  ingressClassName: alb
  rules:
    - http:
        paths:
        - path: /
          pathType: Prefix
          backend:
            service:
              name: service-2048
              port:
                number: 80

Requirements

terraform >= 1.1

Providers

Name	Version
aws	>= 3.0
helm	>= 1.0
kubernetes	>= 1.11

Inputs

Name	Description	Type	Default	Required
argocd	A set of values for enabling deployment through ArgoCD	map(string)	{}	no
cluster_name	The name of the cluster the charts will be deployed to	string	n/a	yes
conf	A set of parameters to pass to Nginx Ingress Controller chart	map	{}	no
module_depends_on	A list of explicit dependencies for the module	list	[]	no
namespace	A name of the existing namespace	string	"kube-system"	no
namespace_name	A name of namespace for creating	string	"external-dns"	no
tags	A tags for attaching to new created AWS resources	map(string)	{}	no
vpc_id	An ID of the VPC	string	""	yes

Outputs

Name	Description
alb_ingress	ALB ingress resource

Example

This example demonstrates how you can use alb controller.

module "alb-ingress" {
  depends_on   = [module.argocd]
  source       = "github.com/provectus/sak-alb-controller"
  cluster_name = module.eks.cluster_id
  vpc_id       = module.network.vpc_id
  argocd       = module.argocd.state
}