resource "kubernetes_service_account" "node_exporter" {
  metadata {
    name      = "node-exporter"
    namespace = local.namespace
    labels = {
      k8s-app = "node-exporter"
    }
  }
  automount_service_account_token = false
}

resource "kubernetes_deployment" "node_exporter" {
  metadata {
    name      = "node-exporter"
    namespace = local.namespace
    labels = {
      k8s-app = "node-exporter"
    }
  }
  spec {
    selector {
      match_labels = {
        k8s-app = "node-exporter"
      }
    }
    strategy {
      type = "RollingUpdate"
    }
    template {
      metadata {
        labels = {
          k8s-app = "node-exporter"
        }
      }
      spec {
        service_account_name            = "node-exporter"
        automount_service_account_token = false
        container {
          name              = "node-exporter"
          image             = "quay.io/prometheus/node-exporter:${local.app_version}"
          image_pull_policy = "IfNotPresent"
          args              = ["--path.rootfs=/host/root"]
          port {
            container_port = 9100
            name           = "http"
            protocol       = "TCP"
          }
          security_context {
            read_only_root_filesystem = true
          }
          volume_mount {
            name       = "tmp-dir"
            mount_path = "/tmp"
          }
          volume_mount {
            name       = "rootfs"
            mount_path = "/host/root"
            read_only  = true
          }
        }
        volume {
          name = "tmp-dir"
          empty_dir {}
        }
        volume {
          name = "rootfs"
          host_path {
            path = "/"
            type = "Directory"
          }
        }
      }
    }
  }
}

resource "kubernetes_service" "node_exporter" {
  metadata {
    name      = "node-exporter"
    namespace = local.namespace
    labels = {
      k8s-app = "node-exporter"
    }
  }
  spec {
    selector = {
      k8s-app = "node-exporter"
    }
    port {
      name        = "http"
      port        = 9100
      target_port = 9100
      protocol    = "TCP"
    }
    type = "ClusterIP"
  }
}