How To Set Up AWS Load Balancer Controller

Set Up AWS Load Balancer Controller

Go to https://docs.aws.amazon.com/eks/latest/userguide/aws-load-balancer-controller.html and follow installation instructions.
Get arn account number by running command:
```
aws sts get-caller-identity
```
This is needed for creating the iamserviceaccount.

Here is a condensed version of the instructions:

Create IAM OIDC provider for cluster.

oidc_id=$(aws eks describe-cluster --name my-cluster --query "cluster.identity.oidc.issuer" --output text | cut -d '/' -f 5)

aws iam list-open-id-connect-providers | grep $oidc_id

eksctl utils associate-iam-oidc-provider --cluster my-cluster --approve

Set up Load Balancer. Note: Replace the arn account number and cluster name where applicable.

curl -o iam_policy.json https://raw.githubusercontent.com/kubernetes-sigs/aws-load-balancer-controller/v2.4.4/docs/install/iam_policy.json

aws iam create-policy \
    --policy-name AWSLoadBalancerControllerIAMPolicy \
    --policy-document file://iam_policy.json

eksctl create iamserviceaccount \
  --cluster=my-cluster \
  --namespace=kube-system \
  --name=aws-load-balancer-controller \
  --role-name "AmazonEKSLoadBalancerControllerRole" \
  --attach-policy-arn=arn:aws:iam::111122223333:policy/AWSLoadBalancerControllerIAMPolicy \
  --approve

kubectl apply \
    --validate=false \
    -f https://github.com/jetstack/cert-manager/releases/download/v1.5.4/cert-manager.yaml

curl -Lo v2_4_4_full.yaml https://github.com/kubernetes-sigs/aws-load-balancer-controller/releases/download/v2.4.4/v2_4_4_full.yaml

sed -i.bak -e '480,488d' ./v2_4_4_full.yaml

sed -i.bak -e 's|your-cluster-name|my-cluster|' ./v2_4_4_full.yaml

kubectl apply -f v2_4_4_full.yaml

curl -Lo v2_4_4_ingclass.yaml https://github.com/kubernetes-sigs/aws-load-balancer-controller/releases/download/v2.4.4/v2_4_4_ingclass.yaml

kubectl apply -f v2_4_4_ingclass.yaml

Verify controller is installed.

kubectl get deployment -n kube-system aws-load-balancer-controller

Set up Ingress

Go to https://raw.githubusercontent.com/kubernetes-sigs/aws-load-balancer-controller/v2.4.4/docs/examples/2048/2048_full.yaml. Note the Ingress section.

Copy the ingress configuration and change the configuration to point to myapp. ingress.yaml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  namespace: default
  name: my-ingress
  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: myapp
                port:
                  number: 80

Apply the ingress.
```
kubectl apply -f ingress.yaml
```
Confirm load balancer. This may take a few minutes.
```
kubectl get ingress
```

References

https://docs.aws.amazon.com/eks/latest/userguide/alb-ingress.html
https://docs.aws.amazon.com/eks/latest/userguide/aws-load-balancer-controller.html
https://kubernetes.io/docs/concepts/services-networking/ingress/