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A terraform module for installing kubernetes/ingress controller onto …
…GKE kubernetes
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# terraform-kubernetes-ingress | ||
Ingress Controller on Kubernetes | ||
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### Please do not get confused with NginxInc Ingress Controller. This module installs kubernetes ingress controller maintained at https://github.com/kubernetes/ingress-nginx | ||
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Tested on GKE. According to [original tutorial from kubernetes falks](https://kubernetes.github.io/ingress-nginx/deploy/), Aws and Azure needs different kind of setup. Please see the deployment differences from [here](https://kubernetes.github.io/ingress-nginx/deploy/) | ||
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## How does it work? | ||
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This module creates following resources; | ||
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- config_maps | ||
- roles/role_bindings with necessary permissions | ||
- cluster_role/cluster_role_bindings with necessary permissions | ||
- a service with LoadBalancer configured | ||
- a deployment with kubernetes/ingress controller image running within the given namespace(only listening ingress events specified for this namespace) for multi-namespace deployments | ||
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## Inputs | ||
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- **namespace** : kubernetes namespace to be deployed | ||
- **replicacount** : replica instance count for Ingress Controller | ||
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## Dependencies | ||
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Terraform Kubernetes Provider | ||
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## Tested With | ||
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- terraform-providers/kubernetes : 1.9.0 | ||
- mongodb:bionic(4.2) docker image | ||
- kubernetes 1.13.7-gke.8 | ||
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## Credits | ||
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This module was initially generated following the original tutorial of kubernetes ingress https://kubernetes.github.io/ingress-nginx/deploy a [k2tf](https://github.com/sl1pm4t/k2tf) project. |
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resource "kubernetes_config_map" "nginx_configuration" { | ||
count = length(var.environments) | ||
metadata { | ||
name = "nginx-configuration" | ||
namespace = var.environments[count.index] | ||
labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
} | ||
} | ||
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resource "kubernetes_config_map" "tcp_services" { | ||
count = length(var.environments) | ||
metadata { | ||
name = "tcp-services" | ||
namespace = var.environments[count.index] | ||
labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
} | ||
} | ||
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resource "kubernetes_config_map" "udp_services" { | ||
count = length(var.environments) | ||
metadata { | ||
name = "udp-services" | ||
namespace = var.environments[count.index] | ||
labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
} | ||
} | ||
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resource "kubernetes_service_account" "nginx_ingress_serviceaccount" { | ||
count = length(var.environments) | ||
metadata { | ||
name = "nginx-ingress-serviceaccount" | ||
namespace = var.environments[count.index] | ||
labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
} | ||
} | ||
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resource "kubernetes_cluster_role" "nginx_ingress_clusterrole" { | ||
metadata { | ||
name = "nginx-ingress-clusterrole" | ||
labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
} | ||
rule { | ||
verbs = ["list", "watch"] | ||
api_groups = [""] | ||
resources = ["configmaps", "endpoints", "nodes", "pods", "secrets"] | ||
} | ||
rule { | ||
verbs = ["get"] | ||
api_groups = [""] | ||
resources = ["nodes"] | ||
} | ||
rule { | ||
verbs = ["get", "list", "watch"] | ||
api_groups = [""] | ||
resources = ["services"] | ||
} | ||
rule { | ||
verbs = ["create", "patch"] | ||
api_groups = [""] | ||
resources = ["events"] | ||
} | ||
rule { | ||
verbs = ["get", "list", "watch"] | ||
api_groups = ["extensions", "networking.k8s.io"] | ||
resources = ["ingresses"] | ||
} | ||
rule { | ||
verbs = ["update"] | ||
api_groups = ["extensions", "networking.k8s.io"] | ||
resources = ["ingresses/status"] | ||
} | ||
} | ||
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resource "kubernetes_role" "nginx_ingress_role" { | ||
count = length(var.environments) | ||
metadata { | ||
name = "nginx-ingress-role" | ||
namespace = var.environments[count.index] | ||
labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
} | ||
rule { | ||
verbs = ["get"] | ||
api_groups = [""] | ||
resources = ["configmaps", "pods", "secrets", "namespaces"] | ||
} | ||
rule { | ||
verbs = ["get", "update"] | ||
api_groups = [""] | ||
resources = ["configmaps"] | ||
resource_names = ["ingress-controller-leader-nginx"] | ||
} | ||
rule { | ||
verbs = ["create"] | ||
api_groups = [""] | ||
resources = ["configmaps"] | ||
} | ||
rule { | ||
verbs = ["get"] | ||
api_groups = [""] | ||
resources = ["endpoints"] | ||
} | ||
} | ||
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resource "kubernetes_role_binding" "nginx_ingress_role_nisa_binding" { | ||
count = length(var.environments) | ||
metadata { | ||
name = "nginx-ingress-role-nisa-binding" | ||
namespace = var.environments[count.index] | ||
labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
} | ||
subject { | ||
kind = "ServiceAccount" | ||
name = "nginx-ingress-serviceaccount" | ||
namespace = var.environments[count.index] | ||
} | ||
role_ref { | ||
api_group = "rbac.authorization.k8s.io" | ||
kind = "Role" | ||
name = "nginx-ingress-role" | ||
} | ||
} | ||
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resource "kubernetes_cluster_role_binding" "nginx_ingress_clusterrole_nisa_binding" { | ||
count = length(var.environments) | ||
metadata { | ||
name = "${var.environments[count.index]}-nginx-ingress-clusterrole-nisa-binding" | ||
labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
} | ||
subject { | ||
kind = "ServiceAccount" | ||
name = "nginx-ingress-serviceaccount" | ||
namespace = var.environments[count.index] | ||
} | ||
role_ref { | ||
api_group = "rbac.authorization.k8s.io" | ||
kind = "ClusterRole" | ||
name = "nginx-ingress-clusterrole" | ||
} | ||
} | ||
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resource "kubernetes_deployment" "nginx_ingress_controller" { | ||
count = length(var.environments) | ||
metadata { | ||
name = "nginx-ingress-controller" | ||
namespace = var.environments[count.index] | ||
labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
} | ||
spec { | ||
replicas = "${var.replicacount}" | ||
selector { | ||
match_labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
} | ||
template { | ||
metadata { | ||
labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
annotations = { "prometheus.io/port" = "10254", "prometheus.io/scrape" = "true" } | ||
} | ||
spec { | ||
automount_service_account_token = true | ||
container { | ||
name = "nginx-ingress-controller" | ||
image = "quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.25.1" | ||
args = ["/nginx-ingress-controller", "--configmap=$(POD_NAMESPACE)/nginx-configuration", "--tcp-services-configmap=$(POD_NAMESPACE)/tcp-services", "--udp-services-configmap=$(POD_NAMESPACE)/udp-services", "--publish-service=$(POD_NAMESPACE)/ingress-nginx", "--annotations-prefix=nginx.ingress.kubernetes.io", "--watch-namespace=$(POD_NAMESPACE)"] | ||
port { | ||
name = "http" | ||
container_port = 80 | ||
} | ||
port { | ||
name = "https" | ||
container_port = 443 | ||
} | ||
env { | ||
name = "POD_NAME" | ||
value_from { | ||
field_ref { | ||
field_path = "metadata.name" | ||
} | ||
} | ||
} | ||
env { | ||
name = "POD_NAMESPACE" | ||
value_from { | ||
field_ref { | ||
field_path = "metadata.namespace" | ||
} | ||
} | ||
} | ||
liveness_probe { | ||
http_get { | ||
path = "/healthz" | ||
port = "10254" | ||
scheme = "HTTP" | ||
} | ||
initial_delay_seconds = 10 | ||
timeout_seconds = 10 | ||
period_seconds = 10 | ||
success_threshold = 1 | ||
failure_threshold = 3 | ||
} | ||
readiness_probe { | ||
http_get { | ||
path = "/healthz" | ||
port = "10254" | ||
scheme = "HTTP" | ||
} | ||
timeout_seconds = 10 | ||
period_seconds = 10 | ||
success_threshold = 1 | ||
failure_threshold = 3 | ||
} | ||
security_context { | ||
capabilities { | ||
add = ["NET_BIND_SERVICE"] | ||
drop = ["ALL"] | ||
} | ||
run_as_user = 33 | ||
allow_privilege_escalation = true | ||
} | ||
} | ||
service_account_name = "nginx-ingress-serviceaccount" | ||
} | ||
} | ||
} | ||
} | ||
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resource "kubernetes_service" "ingress_nginx" { | ||
count = length(var.environments) | ||
metadata { | ||
name = "ingress-nginx" | ||
namespace = var.environments[count.index] | ||
labels = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
} | ||
spec { | ||
port { | ||
name = "http" | ||
port = 80 | ||
target_port = "http" | ||
} | ||
port { | ||
name = "https" | ||
port = 443 | ||
target_port = "https" | ||
} | ||
selector = { "app.kubernetes.io/name" = "ingress-nginx", "app.kubernetes.io/part-of" = "ingress-nginx" } | ||
type = "LoadBalancer" | ||
external_traffic_policy = "Local" | ||
} | ||
} | ||
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variable "namespace" {} | ||
variable "replicacount" {} |