Deployment without PodDisruptionBudget

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Metadata

Id: a05331ee-1653-45cb-91e6-13637a76e4f0

Cloud Provider: Kubernetes

Platform: Terraform

Severity: Low

Category: Availability

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Description

Deployments should be assigned a PodDisruptionBudget to ensure high availability. For kubernetes_deployment resources with spec.replicas > 1, the deployment’s spec.selector.match_labels should be targeted by a kubernetes_pod_disruption_budget. This ensures the deployment’s selector labels are referenced by the PodDisruptionBudget, preventing excessive pod evictions during voluntary disruptions.

Compliant Code Examples

resource "kubernetes_deployment" "example2" {
  metadata {
    name = "terraform-example"
    labels = {
      k8s-app2 = "prometheus2"
    }
  }

  spec {
    replicas = 3

    selector {
      match_labels = {
        k8s-app2 = "prometheus2"
      }
    }

    template {
      metadata {
        labels = {
          k8s-app2 = "prometheus2"
        }
      }

      spec {
        container {
          image = "nginx:1.7.8"
          name  = "example"

          resources {
            limits = {
              cpu    = "0.5"
              memory = "512Mi"
            }
            requests = {
              cpu    = "250m"
              memory = "50Mi"
            }
          }

          liveness_probe {
            http_get {
              path = "/nginx_status"
              port = 80

              http_header {
                name  = "X-Custom-Header"
                value = "Awesome"
              }
            }

            initial_delay_seconds = 3
            period_seconds        = 3
          }
        }
      }
    }
  }
}


resource "kubernetes_pod_disruption_budget" "demo2" {
  metadata {
    name = "demo"
  }
  spec {
    max_unavailable = "20%"
    selector {
      match_labels = {
        k8s-app2 = "prometheus2"
      }
    }
  }
}



resource "kubernetes_deployment" "example3" {
  metadata {
    name = "terraform-example"
    labels = {
      k8s-app2 = "prometheus2"
    }
  }

  spec {
    replicas = 3

    selector {
      match_labels = {
        k8s-app2 = "kubernetes_pod_disruption_budget.demo2.spec.selector.0.match_labels.k8s-app2"
      }
    }

    template {
      metadata {
        labels = {
          k8s-app2 = "prometheus2"
        }
      }

      spec {
        container {
          image = "nginx:1.7.8"
          name  = "example"

          resources {
            limits = {
              cpu    = "0.5"
              memory = "512Mi"
            }
            requests = {
              cpu    = "250m"
              memory = "50Mi"
            }
          }

          liveness_probe {
            http_get {
              path = "/nginx_status"
              port = 80

              http_header {
                name  = "X-Custom-Header"
                value = "Awesome"
              }
            }

            initial_delay_seconds = 3
            period_seconds        = 3
          }
        }
      }
    }
  }
}

Non-Compliant Code Examples

resource "kubernetes_deployment" "example" {
  metadata {
    name = "terraform-example"
    labels = {
      k8s-app = "prometheus"
    }
  }

  spec {
    replicas = 3

    selector {
      match_labels = {
        k8s-app = "prometheus"
      }
    }

    template {
      metadata {
        labels = {
          k8s-app = "prometheus"
        }
      }

      spec {
        container {
          image = "nginx:1.7.8"
          name  = "example"

          resources {
            limits = {
              cpu    = "0.5"
              memory = "512Mi"
            }
            requests = {
              cpu    = "250m"
              memory = "50Mi"
            }
          }

          liveness_probe {
            http_get {
              path = "/nginx_status"
              port = 80

              http_header {
                name  = "X-Custom-Header"
                value = "Awesome"
              }
            }

            initial_delay_seconds = 3
            period_seconds        = 3
          }
        }
      }
    }
  }
}


resource "kubernetes_pod_disruption_budget" "demo" {
  metadata {
    name = "demo"
  }
  spec {
    max_unavailable = "20%"
    selector {
      match_labels = {
        test = "MyExampleApp"
      }
    }
  }
}