AWS NLB Helper operator

This operator allows to manage some settings for AWS Network Load Balanacer using Kubernetes annotations in the service objects.

Disclaimer: This operator is in the early development stages.

Motivations

The current ingress controller for AWS Network Load Balanacers doesn't support setting some attributes like enabling the termination protection, the proxy protocol or the stickness. This operator adds support to change those settings by providing some extra annotations to the kubernetes service objects.

Annotations

Setting	Annotations	Values	Default
Load Balancer Termination Protection	`aws-nlb-helper.3scale.net/loadbalanacer-termination-protection`	`true`, `false`	`false`
Target Group Proxy Protocol	`aws-nlb-helper.3scale.net/enable-targetgroups-proxy-protocol`	`true`, `false`	`false`
Target Group Stickness	`aws-nlb-helper.3scale.net/enable-targetgroups-stickness`	`true`, `false`	`false`
Target Group Deregistration Delay	`aws-nlb-helper.3scale.net/targetgroups-deregisration-delay`	`0-3600`	`300`

AWS authentication

By default, the operator will use the role provided by the service acccount to connect to the AWS API. The YAMLs for deploying using IAM roles for service accounts are available at deploy/iam-service-account.

Otherwise, if the environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY are set, the operator will use them to interact with the AWS API. You can find the YAMLs for deploying the resources using the environment access keys at deploy/iam-env-credentials.

OLM installation

At this stage, we use a custom CatalogSource specific for this operator:

apiVersion: operators.coreos.com/v1alpha1
kind: CatalogSource
metadata:
  name: aws-nlb-helper-operator-catalog
  namespace: openshift-marketplace
  # Installed openshift-marketplace to enable multi-namespace support
  # - https://bugzilla.redhat.com/show_bug.cgi?id=1779080
spec:
  sourceType: grpc
  image: quay.io/3scale/aws-nlb-helper-operator-catalog:latest
  displayName: AWS NLB Helper Operator
  updateStrategy:
    registryPoll:
      interval: 30m

And can be installed via Subscription:

apiVersion: v1
kind: List
items:
  - apiVersion: operators.coreos.com/v1alpha2
    kind: OperatorGroup
    metadata:
      name: aws-nlb-helper
      namespace: aws-nlb-helper
    spec:
      targetNamespaces:
        - 3scale-saas
        - aws-nlb-helper
  - apiVersion: operators.coreos.com/v1alpha1
    kind: Subscription
    metadata:
      name: aws-nlb-helper-operator
      namespace: aws-nlb-helper
    spec:
      channel: alpha
      installPlanApproval: Automatic
      name: aws-nlb-helper-operator
      source: aws-nlb-helper-operator-catalog
      sourceNamespace: openshift-marketplace
      config:
        env:
          - name: AWS_ACCESS_KEY_ID
            valueFrom:
              secretKeyRef:
                name: aws-nlb-helper-iam
                key: AWS_ACCESS_KEY_ID
          - name: AWS_SECRET_ACCESS_KEY
            valueFrom:
              secretKeyRef:
                name: aws-nlb-helper-iam
                key: AWS_SECRET_ACCESS_KEY
          - name: AWS_REGION
            valueFrom:
              secretKeyRef:
                name: aws-nlb-helper-iam
                key: AWS_REGION

Requirements

Secret with IAM credentials (when using env based credentials)

kind: Secret
apiVersion: v1
metadata:
  name: aws-nlb-helper-iam
type: Opaque
data:
  AWS_ACCESS_KEY_ID: __AWS_ACCESS_KEY_ID__
  AWS_REGION: __AWS_REGION__
  AWS_SECRET_ACCESS_KEY: __AWS_SECRET_ACCESS_KEY__

The user needs the following permissions:

tag:GetResources
elasticloadbalancing:DescribeListeners
elasticloadbalancing:DescribeLoadBalancers
elasticloadbalancing:DescribeTags
elasticloadbalancing:DescribeTargetGroupAttributes
elasticloadbalancing:DescribeTargetGroups
elasticloadbalancing:ModifyTargetGroupAttributes
elasticloadbalancing:ModifyLoadBalancerAttributes

If you use Terraform, the following code will create the required user.

data "aws_iam_policy_document" "this" {
  statement {
    actions = [
      "tag:GetResources",
      "elasticloadbalancing:DescribeListeners",
      "elasticloadbalancing:DescribeLoadBalancers",
      "elasticloadbalancing:DescribeTags",
      "elasticloadbalancing:DescribeTargetGroupAttributes",
      "elasticloadbalancing:DescribeTargetGroups",
      "elasticloadbalancing:ModifyTargetGroupAttributes",
      "elasticloadbalancing:ModifyLoadBalancerAttributes"
    ]
    resources = ["*"]
  }
}

resource "aws_iam_user_policy" "this" {
  name   = "aws-nlb-helper-user-policy"
  user   = aws_iam_user.this.name
  policy = data.aws_iam_policy_document.this.json
}

resource "aws_iam_user" "this" {
  name = "aws-nlb-helper"
}

resource "aws_iam_access_key" "this" {
  user = aws_iam_user.this.name
}

Manual Deployment

For manualy deployment, check the available Deployment targets with make help.

...
Deployment
  install          Install CRDs into the K8s cluster specified in ~/.kube/config.
  uninstall        Uninstall CRDs from the K8s cluster specified in ~/.kube/config. Call with ignore-not-found=true to ignore resource not found errors during deletion.
  deploy           Deploy controller to the K8s cluster specified in ~/.kube/config.
  deploy-iam-env   Deploy controller using env IAM variables to the K8s cluster specified in ~/.kube/config.
  undeploy         Undeploy controller from the K8s cluster specified in ~/.kube/config. Call with ignore-not-found=true to ignore resource not found errors during deletion.
...

Deploy manifests can be generated to the ./deploy/ folder using the make generate-deploy-manifests and make generate-deploy-manifests-with-iam-env targets:

...
Generate deployment manifests
  generate-deploy-manifests  Generate the controller manifests to the ./deploy folder.
  generate-deploy-manifests-iam-env  Generate the controller manifests using env IAM variables to the ./deploy folder.
...

Example service

apiVersion: v1
kind: Service
metadata:
  name: test-api
  annotations:
    service.beta.kubernetes.io/aws-load-balancer-type: "nlb"
    aws-nlb-helper.3scale.net/enable-targetgroups-proxy-protocol: "true"
    aws-nlb-helper.3scale.net/enable-targetgroups-stickness: "true"
    aws-nlb-helper.3scale.net/loadbalanacer-termination-protection: "true"
    aws-nlb-helper.3scale.net/targetgroups-deregisration-delay: "450"
spec:
  type: LoadBalancer
  selector:
    deployment: kuard
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: http

Controller logs

When the service is created, the externalName is not yet available (the load balancer is being provisioned), so it try to read the DNS until is available.

{"level":"info","ts":1591461948.7908804,"logger":"controller_service","msg":"Matching annotations found","AnnotationPrefix":"aws-nlb-helper.3scale.net","AnnotationKey":"aws-nlb-helper.3scale.net/enable-targetgroups-proxy-protocol","AnnotationValue":"true"}
{"level":"info","ts":1591461948.7909887,"logger":"controller_service","msg":"Reconciling Service","Namespace":"aws-nlb-helper","Service":"test-api"}
{"level":"info","ts":1591461948.7910357,"logger":"controller_service","msg":"AWS load balancer type set","Namespace":"aws-nlb-helper","Service":"test-api","awsLoadBalancerType":"nlb"}
{"level":"info","ts":1591461948.7910464,"logger":"controller_service","msg":"AWS load balancer DNS not ready.","Namespace":"aws-nlb-helper","Service":"test-api","serviceNameTagValue":"aws-nlb-helper/test-api","loadBalancerNotReadyRetryInterval":30}

Next try after the loadBalancerNotReadyRetryInterval interval, the externalName is still not available.

{"level":"info","ts":1591461948.8010314,"logger":"controller_service","msg":"Matching annotations found","AnnotationPrefix":"aws-nlb-helper.3scale.net","AnnotationKey":"aws-nlb-helper.3scale.net/enable-targetgroups-proxy-protocol","AnnotationValue":"true"}
{"level":"info","ts":1591461948.8010733,"logger":"controller_service","msg":"Reconciling Service","Namespace":"aws-nlb-helper","Service":"test-api"}
{"level":"info","ts":1591461948.801088,"logger":"controller_service","msg":"AWS load balancer type set","Namespace":"aws-nlb-helper","Service":"test-api","awsLoadBalancerType":"nlb"}
{"level":"info","ts":1591461948.8010914,"logger":"controller_service","msg":"AWS load balancer DNS not ready.","Namespace":"aws-nlb-helper","Service":"test-api","serviceNameTagValue":"aws-nlb-helper/test-api","loadBalancerNotReadyRetryInterval":30}

On the third try, the externalName is available. It will be used along the service name to identify the load balancer.

{"level":"info","ts":1591461951.3948922,"logger":"controller_service","msg":"Matching annotations found","AnnotationPrefix":"aws-nlb-helper.3scale.net","AnnotationKey":"aws-nlb-helper.3scale.net/enable-targetgroups-proxy-protocol","AnnotationValue":"true"}
{"level":"info","ts":1591461951.3949463,"logger":"controller_service","msg":"Reconciling Service","Namespace":"aws-nlb-helper","Service":"test-api"}
{"level":"info","ts":1591461951.39497,"logger":"controller_service","msg":"AWS load balancer type set","Namespace":"aws-nlb-helper","Service":"test-api","awsLoadBalancerType":"nlb"}
{"level":"info","ts":1591461951.3949816,"logger":"controller_service","msg":"AWS load balancer type set","Namespace":"aws-nlb-helper","Service":"test-api","awsLoadBalancerDNS":"ac9e5c9af3c404884a410ab59ba57490-f738846f56f647b9.elb.us-east-1.amazonaws.com"}

All the annotations are read, the ones not defined are defaulted to the values defined in the table above.

{"level":"info","ts":1591461951.394987,"logger":"controller_service","msg":"Unable to parse Deregistration Delay value, defaulting.","Namespace":"aws-nlb-helper","Service":"test-api","awsLoadBalancerSettingsDeregistrationDelay":300}

Now the controller looks for the load balancer, first using the tag kubernetes.io/service-name set by the AWS kubernetes controller.

{"level":"info","ts":1591461951.3951344,"logger":"helper_aws","msg":"Looking for tagged resources","LoadBalancerDNS":"ac9e5c9af3c404884a410ab59ba57490-f738846f56f647b9.elb.us-east-1.amazonaws.com","ServiceName":"aws-nlb-helper/test-api","Tags":{"kubernetes.io/service-name":"aws-nlb-helper/test-api"}}

If the previous filter returns at least one load balancer, will look for a load balancer matching the externalName.

{"level":"info","ts":1591461951.7107737,"logger":"helper_aws","msg":"Load balancer matching tags and DNS found","LoadBalancerDNS":"ac9e5c9af3c404884a410ab59ba57490-f738846f56f647b9.elb.us-east-1.amazonaws.com","ServiceName":"aws-nlb-helper/test-api","LoadBalancerARN":"arn:aws:elasticloadbalancing:us-east-1:170744112331:loadbalancer/net/ac9e5c9af3c404884a410ab59ba57490/f738846f56f647b9","LoadBalancerDNS":"ac9e5c9af3c404884a410ab59ba57490-f738846f56f647b9.elb.us-east-1.amazonaws.com"}

If there is a match, it found a load balancer with the kubernetes.io/service-name and externalName.

The first update will change the load balancer resource, enabling or disabling the termination protection.

{"level":"info","ts":1591461951.7357097,"logger":"helper_aws","msg":"Load balancer updated","ModifyLoadBalancerAttributesOutput":{"Attributes":[{"Key":"deletion_protection.enabled","Value":"false"},{"Key":"access_logs.s3.enabled","Value":"false"},{"Key":"load_balancing.cross_zone.enabled","Value":"false"},{"Key":"access_logs.s3.prefix","Value":""},{"Key":"access_logs.s3.bucket","Value":""}]}}

After the load balancer attribute has been updated, will look for the Target Groups attached to the listeners and then update the stickness, proxy-protocol and deregistration delay attributes.

{"level":"info","ts":1591461951.7687242,"logger":"helper_aws","msg":"Updating target group","targetGroupARN":"arn:aws:elasticloadbalancing:us-east-1:170744112331:targetgroup/k8s-awsnlbhe-testapi-b3a8421265/0522c9888807019c"}
{"level":"info","ts":1591461951.7973483,"logger":"helper_aws","msg":"Target groups updated","TargetGroupARN":"arn:aws:elasticloadbalancing:us-east-1:170744112331:targetgroup/k8s-awsnlbhe-testapi-b3a8421265/0522c9888807019c","ModifyLoadBalancerAttributesOutput":{"Attributes":[{"Key":"proxy_protocol_v2.enabled","Value":"true"},{"Key":"stickiness.enabled","Value":"false"},{"Key":"deregistration_delay.timeout_seconds","Value":"300"},{"Key":"stickiness.type","Value":"source_ip"}]}}
{"level":"info","ts":1591461951.7974193,"logger":"controller_service","msg":"Load balancer updated","Namespace":"aws-nlb-helper","Service":"test-api","awsLoadBalancerIngressHostname":"ac9e5c9af3c404884a410ab59ba57490-f738846f56f647b9.elb.us-east-1.amazonaws.com"}

If a service is added or updated, will run again. A part for those kind of events, the reconciliation loop will run again after the reconcileInterval, this way any manual change will be reverted to the state defined in the service.

Contributing

You can contribute by:

Raising any issues you find using the operator
Fixing issues by opening Pull Requests
Submitting a patch or opening a PR
Improving documentation
Talking about the operator

All bugs, tasks or enhancements are tracked as GitHub issues.

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