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Updated templates and code to reflect newest best state from aplayr a…
…nd winedirect Updated EKS AMIs Added uuid generation function for templates Created multiple remote states for multi env Added k8s external_dns support Productionized S3/Cloudfront setup by adding proper access control, ACM, R53 Added support for multiple buckets Added ASG min for EKS
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143 changes: 143 additions & 0 deletions
143
templates/kubernetes/terraform/modules/kubernetes/external_dns.tf
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| # Trust relationship | ||
| data "aws_iam_policy_document" "external_dns_trust_relationship" { | ||
| statement { | ||
| actions = ["sts:AssumeRole"] | ||
|
|
||
| principals { | ||
| type = "Service" | ||
| identifiers = ["ec2.amazonaws.com"] | ||
| } | ||
| } | ||
|
|
||
| statement { | ||
| actions = ["sts:AssumeRole"] | ||
|
|
||
| principals { | ||
| type = "AWS" | ||
| identifiers = var.external_dns_assume_roles | ||
| } | ||
| } | ||
| } | ||
|
|
||
| # external-dns role | ||
| resource "aws_iam_role" "external_dns_role" { | ||
| name = "k8s-external-dns-role" | ||
| assume_role_policy = data.aws_iam_policy_document.external_dns_trust_relationship.json | ||
| } | ||
|
|
||
| data "aws_iam_policy_document" "external_dns_policy_doc" { | ||
| statement { | ||
| sid = "k8sExternalDnsRead" | ||
| effect = "Allow" | ||
|
|
||
| actions = [ | ||
| "route53:ListHostedZones", | ||
| "route53:ListResourceRecordSets", | ||
| ] | ||
|
|
||
| resources = ["*"] | ||
| } | ||
|
|
||
| statement { | ||
| sid = "k8sExternalDnsWrite" | ||
| effect = "Allow" | ||
|
|
||
| actions = ["route53:ChangeResourceRecordSets"] | ||
|
|
||
| resources = ["arn:aws:route53:::hostedzone/*"] | ||
| } | ||
| } | ||
|
|
||
| resource "aws_iam_role_policy" "external_dns_policy" { | ||
| name = "k8s-external-dns-policy" | ||
| role = aws_iam_role.external_dns_role.id | ||
| policy = data.aws_iam_policy_document.external_dns_policy_doc.json | ||
| } | ||
|
|
||
| resource "kubernetes_service_account" "external_dns" { | ||
| metadata { | ||
| name = "external-dns" | ||
| namespace = "kube-system" | ||
| } | ||
| } | ||
|
|
||
| resource "kubernetes_cluster_role" "external_dns" { | ||
| metadata { | ||
| name = "external-dns" | ||
| } | ||
| rule { | ||
| verbs = ["get", "list", "watch"] | ||
| api_groups = [""] | ||
| resources = ["pods", "services"] | ||
| } | ||
| rule { | ||
| verbs = ["get", "list", "watch"] | ||
| api_groups = ["extensions"] | ||
| resources = ["ingresses"] | ||
| } | ||
| rule { | ||
| verbs = ["list"] | ||
| api_groups = [""] | ||
| resources = ["nodes"] | ||
| } | ||
| } | ||
|
|
||
| resource "kubernetes_cluster_role_binding" "external_dns" { | ||
| metadata { | ||
| name = "external-dns" | ||
| } | ||
| subject { | ||
| kind = "ServiceAccount" | ||
| name = "external-dns" | ||
| namespace = "kube-system" | ||
| } | ||
| role_ref { | ||
| api_group = "rbac.authorization.k8s.io" | ||
| kind = "ClusterRole" | ||
| name = "external-dns" | ||
| } | ||
| } | ||
|
|
||
| resource "kubernetes_deployment" "external_dns" { | ||
| metadata { | ||
| name = "external-dns" | ||
| namespace = "kube-system" | ||
| } | ||
| spec { | ||
| replicas = 1 | ||
| selector { | ||
| match_labels = { | ||
| "app" = "external-dns", | ||
| } | ||
| } | ||
| template { | ||
| metadata { | ||
| labels = { | ||
| "app" = "external-dns", | ||
| } | ||
| annotations = { | ||
| "iam.amazonaws.com/role" = "k8s-external-dns-role", | ||
| } | ||
| } | ||
| spec { | ||
| container { | ||
| name = "external-dns" | ||
| image = "registry.opensource.zalan.do/teapot/external-dns:latest" | ||
| args = [ | ||
| "--source=service", | ||
| "--source=ingress", | ||
| "--domain-filter=${var.external_dns_zone}", # Give access only to the specified zone | ||
| "--provider=aws", | ||
| "--aws-zone-type=public", | ||
| "--policy=upsert-only", # Prevent ExternalDNS from deleting any records | ||
| "--registry=txt", | ||
| "--txt-owner-id=${var.external_dns_owner_id}", # ID of txt record to manage state | ||
| ] | ||
| } | ||
|
|
||
| service_account_name = "external-dns" | ||
| automount_service_account_token = true | ||
| } | ||
| } | ||
| } | ||
| } |
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