92 lines
2.4 KiB
Markdown
92 lines
2.4 KiB
Markdown
# AWS
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## Load Balancing
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### kube-apiserver
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A network load balancer (NLB) distributes IPv4 TCP/6443 traffic across a target group of controller nodes with a healthy `kube-apiserver`. Clusters with multiple controllers span zones in a region to tolerate zone outages.
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### HTTP/HTTPS Ingress
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A network load balancer (NLB) distributes IPv4 TCP/80 and TCP/443 traffic across two target groups of worker nodes with a healthy Ingress controller. Workers span the zones in a region to tolerate zone outages.
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The AWS NLB has a DNS alias record (regional) resolving to 3 zonal IPv4 addresses. The alias record is output as `ingress_dns_name` for use in application DNS CNAME records. See [Ingress on AWS](/addons/ingress/#aws).
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### TCP Services
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Load balance TCP applications by adding a listener and target group. A listener and target group may map different ports (e.g 3333 external, 30333 internal).
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```tf
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# Forward TCP traffic to a target group
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resource "aws_lb_listener" "some-app" {
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load_balancer_arn = module.tempest.nlb_id
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protocol = "TCP"
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port = "3333"
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default_action {
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type = "forward"
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target_group_arn = aws_lb_target_group.some-app.arn
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}
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}
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# Target group of workers for some-app
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resource "aws_lb_target_group" "some-app" {
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name = "some-app"
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vpc_id = module.tempest.vpc_id
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target_type = "instance"
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protocol = "TCP"
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port = 3333
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health_check {
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protocol = "TCP"
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port = 30333
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}
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}
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```
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Pass `worker_target_groups` to the cluster to register worker instances into custom target groups.
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```tf
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module "tempest" {
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...
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worker_target_groups = [
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aws_lb_target_group.some-app.id,
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]
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}
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```
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Notes:
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* AWS NLBs and target groups do not support UDP
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* Global Accelerator does support UDP, but its expensive
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## Firewalls
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Add firewall rules to the worker security group.
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```tf
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resource "aws_security_group_rule" "some-app" {
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security_group_id = module.tempest.worker_security_groups[0]
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type = "ingress"
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protocol = "tcp"
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from_port = 3333
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to_port = 30333
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cidr_blocks = ["0.0.0.0/0"]
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}
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```
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## IPv6
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AWS Network Load Balancers do not support `dualstack`.
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| IPv6 Feature | Supported |
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|-------------------------|-----------|
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| Node IPv6 address | Yes |
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| Node Outbound IPv6 | Yes |
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| Kubernetes Ingress IPv6 | No |
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