<p>I'm experimenting with terraform to deploy k8s resources.</p>
<p>I created a mongodb deployment</p>
<pre><code>provider &quot;kubernetes&quot; {
  config_context = &quot;kubernetes-admin@kubernetes&quot;
}

resource &quot;kubernetes_namespace&quot; &quot;demo-namespace&quot; {
  metadata {
    name = &quot;my-demo-namespace&quot;
  }
}
// mongodb
resource &quot;kubernetes_deployment&quot; &quot;mongodb&quot; {
  metadata {
    name = &quot;mongodb&quot;
    namespace = kubernetes_namespace.demo-namespace.metadata[0].name
    labels = {
      app = &quot;mongodb&quot;
    }
  }

  spec {
    replicas = 1

    selector {
      match_labels = {
        app = &quot;mongodb&quot;
      }
    }

    template {
      metadata {
        labels = {
          app = &quot;mongodb&quot;
        }
      }

      spec {
        container {
          image = &quot;mongo&quot;
          name  = &quot;mongodb&quot;

          env_from { 
            secret_ref {
              name = kubernetes_secret.scrt-mongodb.metadata[0].name
            }
            config_map_ref {
              name = kubernetes_config_map.cm-mongodb.metadata[0].name  
            }
          }

          resources {
            limits {
              cpu    = &quot;500m&quot;
              memory = &quot;1Gi&quot;
            }
            requests {
              cpu    = &quot;150m&quot;
              memory = &quot;256Mi&quot;
            }
          }

          liveness_probe {
            exec {
              command =  [&quot;bash&quot;, &quot;-c&quot;, &quot;mongo -u $MONGO_INITDB_ROOT_USERNAME -p $MONGO_INITDB_ROOT_PASSWORD --eval db.adminCommand(\&quot;ping\&quot;)&quot;]
            }
            initial_delay_seconds = 3
            period_seconds        = 1
          }
        }
      }
    }
  }
}

// mongodb configmap
resource &quot;kubernetes_config_map&quot; &quot;cm-mongodb&quot; {
  metadata {
    name = &quot;cm-mongodb&quot;
    namespace = kubernetes_namespace.demo-namespace.metadata.0.name
  }

  // improve creds with secret
  data = {
    MONGO_INITDB_DATABASE = &quot;movies&quot;
  }
}

// monbodb secret
resource &quot;kubernetes_secret&quot; &quot;scrt-mongodb&quot; {
  metadata {
    name = &quot;mongodb-creds&quot;
  }

  data = {
    MONGO_INITDB_ROOT_USERNAME = &quot;root-user&quot;
    MONGO_INITDB_ROOT_PASSWORD = &quot;secret&quot;
  }

  type = &quot;opaque&quot;
}
</code></pre>
<p>This fails with:</p>
<pre><code>kubernetes_config_map.cm-mongodb: Creation complete after 0s [id=my-demo-namespace/cm-mongodb]
kubernetes_deployment.mongodb: Creating...

Error: Failed to create deployment: Deployment.apps &quot;mongodb&quot; is invalid: spec.template.spec.containers[0].envFrom: Invalid value: &quot;&quot;: may not have more than one field specified at a time

  on template.tf line 12, in resource &quot;kubernetes_deployment&quot; &quot;mongodb&quot;:
  12: resource &quot;kubernetes_deployment&quot; &quot;mongodb&quot; {
</code></pre>
<p>What is wrong here?</p>

<p>You missed this line:</p>
<pre><code>namespace = kubernetes_namespace.demo-namespace.metadata.0.name
</code></pre>
<p><strong>You did not define the resource in the desired namespace</strong> so terraform failed to &quot;find&quot; the desired value.</p>
<hr />
<pre class="lang-yaml prettyprint-override"><code>// monbodb secret
resource &quot;kubernetes_secret&quot; &quot;scrt-mongodb&quot; {
  metadata {
    name = &quot;mongodb-creds&quot;
    # -------------------------------------------------------------
    # -------------------------------------------------------------
    # Add the namespace here
    namespace = kubernetes_namespace.demo-namespace.metadata.0.name
    # -------------------------------------------------------------
    # -------------------------------------------------------------
    }

  data = {
    MONGO_INITDB_ROOT_USERNAME = &quot;root-user&quot;
    MONGO_INITDB_ROOT_PASSWORD = &quot;secret&quot;
  }

  type = &quot;opaque&quot;
}
</code></pre>
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