Use separate Kubernetes namespaces per environment

Kubernetes deployments on new clusters will now have
a separate namespace per project environment, instead
of sharing a single namespace for the project.

Behaviour of existing clusters is unchanged.

All new functionality is controlled by the
:kubernetes_namespace_per_environment feature flag,
which is safe to enable/disable at any time.

1 files changed, 10 insertions, 0 deletions

diff --git a/db/migrate/20190712040400_add_environment_id_to_clusters_kubernetes_namespaces.rb b/db/migrate/20190712040400_add_environment_id_to_clusters_kubernetes_namespaces.rb
new file mode 100644
index 00000000000..5ab5a9ba2f8
--- /dev/null
+++ b/db/migrate/20190712040400_add_environment_id_to_clusters_kubernetes_namespaces.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class AddEnvironmentIdToClustersKubernetesNamespaces < ActiveRecord::Migration[5.1]
+  DOWNTIME = false
+
+  def change
+    add_reference :clusters_kubernetes_namespaces, :environment,
+      index: true, type: :bigint, foreign_key: { on_delete: :nullify }
+  end
+end