How to configure an internal Elastic Load Balancer (ELB) or Network Load Balancer (NLB) with an Istio Ingress Gateway in Rancher v2.3+

This document (000020142) is provided subject to the disclaimer at the end of this document.

Situation

Task

When configuring an Istio Ingress Gateway, a LoadBalancer type service is commonly configured to provide external access to the cluster.

By default Kubernetes will provision an internet-facing Classic Load Balancer (CLB). The below steps provide guidance on the annotations needed to configure an internal CLB or Network Load Balancer (NLB) using private subnets.

Pre-requisites

Note: When using Load Balancers with the AWS cloud provider, it is important tag the private and public subnets in the VPC so that kube-controller-manager can correctly discover the specific subnets intended for use.

For example the kubernetes.io/role/internal-elb and kubernetes.io/role/elb keys configured respectively, with the value of 1.

Steps

Enable the Istio Ingress Gateway

If the not already enabled, enable the Istio Ingress Gateway. In the drop down list for 'Service Type of Ingress Gateway', select LoadBalancer.

Use an internal Load Balancer

When editing the Istio Ingress Gateway, click the drop down for Custom Answers.

Paste the below in the Variable field, this will automatically populate the value:

gateways.istio-ingressgateway.serviceAnnotations."service\.beta\.kubernetes\.io/aws-load-balancer-internal" = "true"
Use an NLB

To use an NLB, click 'Add Answer' and paste the below in the Variable field:

gateways.istio-ingressgateway.serviceAnnotations."service\.beta\.kubernetes\.io/aws-load-balancer-type" = nlb

Note: An NLB can be used as an internet-facing loadbancer by using only the above annotation, without adding the aws-load-balancer-internal annotation.

References

Istio install options documentation

Kubernetes load balancer documentation

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:000020142
  • Creation Date: 06-May-2021
  • Modified Date:06-May-2021
    • SUSE Rancher

< Back to Support Search

For questions or concerns with the SUSE Knowledgebase please contact: tidfeedback@suse.com

SUSE Support Forums

Get your questions answered by experienced Sys Ops or interact with other SUSE community experts.

Join Our Community

Support Resources

Learn how to get the most from the technical support you receive with your SUSE Subscription, Premium Support, Academic Program, or Partner Program.


SUSE Customer Support Quick Reference Guide SUSE Technical Support Handbook Update Advisories
Support FAQ

Open an Incident

Open an incident with SUSE Technical Support, manage your subscriptions, download patches, or manage user access.

Go to Customer Center