mycroft/infra-aws-eks
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Create a LoadBalancer for nginx.

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This commit is contained in:
Patrick MARIE 2022-02-12 10:02:17 +01:00
parent 0179bb0828
commit f5b4a7d323
4 changed files with 56 additions and 3 deletions
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29
README.md
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@ -126,6 +126,8 @@ nginx NodePort 172.20.10.182 <none> 80:31234/TCP 6m8s app=Nginx
### Reaching the app.
#### Using the NodePort
It is not possible with terraform output to retrieve the configured nodes. However, it is possible to retrieve IPs for our nodes using aws cli:
```sh
@ -146,6 +148,31 @@ $ curl http://$CLUSTER_IP:31234/
```
#### Using the LoadBalancer
This approach is simpler, as it is just needed to retrieve the created the LoadBalancer external address, either by using `kubectl` or `terraform output`:
```sh
$ kubectl get svc -n testaroo nginx-lb
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx-lb LoadBalancer 172.20.149.132 a34059e68106b41a292730b5defe734b-581837320.eu-west-3.elb.amazonaws.com 80:31698/TCP 3m50s
$ terraform output 09:59:47
lb-address = "a34059e68106b41a292730b5defe734b-581837320.eu-west-3.elb.amazonaws.com"
```
The service should be reachable directly using it:
```sh
$ curl http://$(terraform output -raw lb-address):80/
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
...
```
### Reaching the/a node ssh port:
Still using the AWS CLI to retrieve nodes, just:
@ -182,7 +209,7 @@ PID USER TIME COMMAND
$ kubectl exec -ti -n testaroo alpine -- sh
/ # echo "hello world"
hello world
/ #
/ #
```
## Todo:

3
eks/vpc.tf
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@ -20,10 +20,11 @@ resource "aws_subnet" "subnets" {
tags = {
Name = "${each.key}-${var.environment}"
Env = var.environment
"kubernetes.io/cluster/eks-cluster-${var.environment}" = "shared"
"kubernetes.io/cluster/eks-cluster-${var.environment}" = "owned"
}
}
// The internet gateway is required so nodes can connect to the control plane
resource "aws_internet_gateway" "nat_gateway" {
vpc_id = aws_vpc.main.id
}

23
k8s/nginx.tf
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@ -59,7 +59,7 @@ resource "kubernetes_service" "testaroo" {
count = var.enable_nginx
metadata {
name = "nginx"
name = "nginx-np"
namespace = kubernetes_namespace.testaroo.metadata.0.name
}
@ -76,3 +76,24 @@ resource "kubernetes_service" "testaroo" {
}
}
}
resource "kubernetes_service" "testaroo-lb" {
count = var.enable_nginx
metadata {
name = "nginx-lb"
namespace = kubernetes_namespace.testaroo.metadata.0.name
}
spec {
selector = {
app = kubernetes_deployment.testaroo[0].spec.0.template.0.metadata.0.labels.app
}
type = "LoadBalancer"
port {
port = 80
target_port = 80
}
}
}

4
k8s/output.tf Normal file
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@ -0,0 +1,4 @@
output "lb-address" {
description = "load balancer hosntame"
value = flatten(kubernetes_service.testaroo-lb[0].status[*].load_balancer[*].ingress[*].hostname)[0]
}