volume - config_map is being recreated at every apply

[TrimPeachu]

Terraform Version, Provider Version and Kubernetes Version

Terraform version: 1.4.6
Kubernetes provider version: v2.23.0
Kubernetes version: 1.27.3-gke.100

Terraform Configuration Files

resource "kubernetes_deployment_v1" "kube-test" {
...
        volume_mount {
          name       = "configs-secrets"
          mount_path = var.configs_secrets_dir
          read_only  = true
        }

        volume {
          name = "configs-secrets"
          projected {
            sources {
              secret {
                name     = kubernetes_secret.job-secrets.metadata[0].name
                optional = false

                dynamic "items" {
                  for_each = var.k8s-secrets

                  content {
                    key  = items.value
                    path = "${items.value}/${items.value}.json"
                  }
                }
              }

              config_map {
                name     = kubernetes_config_map.job-configs.metadata[0].name
                optional = true 

                dynamic "items" {
                  for_each = setunion(toset(var.k8s-required-configmaps))

                  content {
                    key  = items.key
                    path = "${items.key}/${items.key}.json"
                  }
                }
              }
            }
          }
        }
      }

Expected Behavior

Show no changes

Actual Behavior

 # kubernetes_deployment_v1.kube-test will be updated in-place
  ~ resource "kubernetes_deployment_v1" "kube-test" {
        id               = "default/kube-test"
        # (1 unchanged attribute hidden)

      ~ spec {
            # (5 unchanged attributes hidden)

          ~ template {
              ~ spec {
                    # (12 unchanged attributes hidden)

                  ~ volume {
                        name = "configs-secrets"

                      ~ projected {
                            # (1 unchanged attribute hidden)

                          ~ sources {
                              + config_map {
                                  + name     = "job-configs"
                                  + optional = true

                                  + items {
                                      + key  = "test"
                                      + path = "test/test.json"
                                    }
                                 ...
                                }
                           - sources {
                              - config_map {
                                  - name     = "job-configs" -> null
                                  - optional = false -> null

                                  - items {
                                      - key  = "test" -> null
                                      - path = "test/test.json" -> null
                                    }
                                ...

I seem to have an issue that at first seemed similar to the #1835 but if I have understood it correctly, their problem was using service account name.

[alexsomesan]

@TrimPeachu is this resource part of a module? How is the value of var.k8s-required-configmaps being set? Is kubernetes_config_map.job-configs also dependant on that value?

[TrimPeachu]

Hi @alexsomesan ,

This resource is not part of a module.

var.k8s-required-configmaps is defined as so:

variable "k8s-required-configmaps" {
  default = [
    "test.A",
    "test.B"
  ]
}

And correct, kubernetes_config_map.job-configs is also depended on var.k8s-required-configmaps

resource "kubernetes_config_map" "job-configs" {
  provider = kubernetes

  metadata {
    name = "job-configs"
  }

  data = merge(
    { for config in var.k8s-required-configmaps : config => file("${var.jobs_configs_dir}/${config}.json") },
    { for config in local.k8s-optional-configmaps : config => file("${var.jobs_configs_dir}/${config}.json") if fileexists("${var.jobs_configs_dir}/${config}.json") }
  )
}

However upon testing, same unwanted result occurs even if I use sth like this:

resource "kubernetes_config_map" "job-configs" {
  provider = kubernetes

  metadata {
    name = "job-configs"
  }

  data = {
    "test1" = "testA"
    "test2" = "testB"
    "test3" = "testC"
  }
}

[TrimPeachu]

Hi, is the info I have provided sufficient @alexsomesan or is there something more I can provide so you are able to assist me with this issue?

Thanks :))