Creating an instance of the AWS Load Balancer Controller - AWS Load Balancer Operator | Networking

Creating the AWS Load Balancer Controller

After installing the AWS Load Balancer Operator, you can create the AWS Load Balancer Controller.

Creating the AWS Load Balancer Controller

You can install only a single instance of the AWSLoadBalancerController object in a cluster. You can create the AWS Load Balancer Controller by using CLI. The AWS Load Balancer Operator reconciles only the cluster named resource.

Prerequisites

You have created the echoserver namespace.
You have access to the OpenShift CLI (oc).

Procedure

Create a YAML file that defines the AWSLoadBalancerController object:

Example sample-aws-lb.yaml file

apiVersion: networking.olm.openshift.io/v1
kind: AWSLoadBalancerController (1)
metadata:
  name: cluster (2)
spec:
  subnetTagging: Auto (3)
  additionalResourceTags: (4)
  - key: example.org/security-scope
    value: staging
  ingressClass: alb (5)
  config:
    replicas: 2 (6)
  enabledAddons: (7)
    - AWSWAFv2 (8)

1	Defines the `AWSLoadBalancerController` object.
2	Defines the AWS Load Balancer Controller name. This instance name gets added as a suffix to all related resources.
3	Configures the subnet tagging method for the AWS Load Balancer Controller. The following values are valid: `Auto`: The AWS Load Balancer Operator determines the subnets that belong to the cluster and tags them appropriately. The Operator cannot determine the role correctly if the internal subnet tags are not present on internal subnet. `Manual`: You manually tag the subnets that belong to the cluster with the appropriate role tags. Use this option if you installed your cluster on user-provided infrastructure.
4	Defines the tags used by the AWS Load Balancer Controller when it provisions AWS resources.
5	Defines the ingress class name. The default value is `alb`.
6	Specifies the number of replicas of the AWS Load Balancer Controller.
7	Specifies annotations as an add-on for the AWS Load Balancer Controller.
8	Enables the `alb.ingress.kubernetes.io/wafv2-acl-arn` annotation.

Create the AWSLoadBalancerController object by running the following command:
```
$ oc create -f sample-aws-lb.yaml
```

Create a YAML file that defines the Deployment resource:

Example sample-aws-lb.yaml file

apiVersion: apps/v1
kind: Deployment (1)
metadata:
  name: <echoserver> (2)
  namespace: echoserver
spec:
  selector:
    matchLabels:
      app: echoserver
  replicas: 3 (3)
  template:
    metadata:
      labels:
        app: echoserver
    spec:
      containers:
        - image: openshift/origin-node
          command:
           - "/bin/socat"
          args:
            - TCP4-LISTEN:8080,reuseaddr,fork
            - EXEC:'/bin/bash -c \"printf \\\"HTTP/1.0 200 OK\r\n\r\n\\\"; sed -e \\\"/^\r/q\\\"\"'
          imagePullPolicy: Always
          name: echoserver
          ports:
            - containerPort: 8080

1	Defines the deployment resource.
2	Specifies the deployment name.
3	Specifies the number of replicas of the deployment.

Create a YAML file that defines the service resource:

Example service-albo.yaml file:

apiVersion: v1
kind: service (1)
metadata:
  name: <echoserver> (2)
  namespace: echoserver
spec:
  ports:
    - port: 80
      targetPort: 8080
      protocol: TCP
  type: NodePort
  selector:
    app: echoserver

1	Defines the service resource.
2	Specifies the service name.

Create a YAML file that defines the Ingress resource:

Example ingress-albo.yaml file:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: <name> (1)
  namespace: echoserver
  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/target-type: instance
spec:
  ingressClassName: alb
  rules:
    - http:
        paths:
          - path: /
            pathType: Exact
            backend:
              service:
                name: <echoserver> (2)
                port:
                  number: 80

1	Specify a name for the `Ingress` resource.
2	Specifies the service name.

Verification

Save the status of the Ingress resource in the HOST variable by running the following command:

$ HOST=$(oc get ingress -n echoserver echoserver --template='{{(index .status.loadBalancer.ingress 0).hostname}}')

Verify the status of the Ingress resource by running the following command:
```
$ curl $HOST
```