kubernetes-deployment.tf

# terraform doc: https://www.terraform.io/docs/providers/kubernetes/r/deployment.html
resource "kubernetes_deployment" "app" {
  metadata {
    name      = "my-postgres-deployment"
    namespace = "my-postgres-namespace"
    labels = {
      app = "postgres"
    }
  }

  spec {
    replicas = 1 # just spin up one entity, no replication.

    selector {
      match_labels = {
        app = "postgres"
      }
    }

    template {
      metadata {
        labels = {
          app = "postgres"
        }
      }

      spec {
        service_account_name = "TODO: please setup your kubernetes service account first, then reference to it here"

        container {
          name  = "postgres"
          image = "postgres-cdc:latest"

          # terraform official doc: https://www.terraform.io/docs/providers/kubernetes/r/deployment.html#image_pull_policy
          # private image registry: https://stackoverflow.com/questions/49639280/kubernetes-cannot-pull-image-from-private-docker-image-repository
          image_pull_policy = "Always"

          port {
            container_port = "5432"
          }

          env {
            name  = "POSTGRES_DB"
            value = "default_database"
          }

          env {
              name = "POSTGRES_USER"
              value = "admin"
          }
          
          env {
              name = "POSTGRES_PASSWORD"
              value = "your-postgres-database-passeword"
          }
          
          env {
              name = "DATA_VOLUME_MOUNT"
              value = "/data"
          }

          #   resources {
          #     limits {
          #       cpu    = "0.5"
          #       memory = "512Mi"
          #     }
          #     requests {
          #       cpu    = "250m"
          #       memory = "50Mi"
          #     }
          #   }
        }
        
        # persistent volume setup
        # based on https://www.digitalocean.com/docs/kubernetes/how-to/add-volumes/
        init_container {
            name = "my-postgres-initial-container"
            image = "busybox"
            command = ["/bin/chmod","-R","777", "/data"]
            volume_mount {
                name = "my-postgres-volume"
                mount_path = "/data"
            }
        }

        volume {
            name = "my-postgres-volume"
            persistent_volume_claim {
                claim_name = kubernetes_persistent_volume_claim.app_digitalocean_pvc.0.metadata.0.name
            }
        }
      }
    }
  }
}