From 3990fbfe062791ce8e727654e8c86d8f38182d25 Mon Sep 17 00:00:00 2001
From: Ben Vincent <ben@unkin.net>
Date: Tue, 26 May 2026 00:06:56 +1000
Subject: [PATCH] feat(vault): switch to Kubernetes service registration (#171)

Replaces Consul service registration with the native Kubernetes provider so Vault labels its own pods with active/standby/perf-standby status without requiring a Consul dependency.

## Changes
- `values.yaml`: swap `service_registration "consul"` for `service_registration "kubernetes" {}`, add `VAULT_K8S_NAMESPACE` and `VAULT_K8S_POD_NAME` env vars via downward API
- `role_k8s-service-registration.yaml`: Role + RoleBinding granting the `vault` service account `get`/`update`/`patch` on pods
- `kustomization.yaml`: include new RBAC file

Reviewed-on: https://git.unkin.net/unkin/argocd-apps/pulls/171
---
 apps/base/vault/kustomization.yaml            |  1 +
 .../vault/role_k8s-service-registration.yaml  | 24 +++++++++++++++++++
 apps/overlays/au-syd1/vault/values.yaml       | 12 +++++++---
 3 files changed, 34 insertions(+), 3 deletions(-)
 create mode 100644 apps/base/vault/role_k8s-service-registration.yaml

diff --git a/apps/base/vault/kustomization.yaml b/apps/base/vault/kustomization.yaml
index 2c2b5da..aa4c1ab 100644
--- a/apps/base/vault/kustomization.yaml
+++ b/apps/base/vault/kustomization.yaml
@@ -6,3 +6,4 @@ resources:
   - namespace.yaml
   - gateway.yaml
   - httproute.yaml
+  - role_k8s-service-registration.yaml
diff --git a/apps/base/vault/role_k8s-service-registration.yaml b/apps/base/vault/role_k8s-service-registration.yaml
new file mode 100644
index 0000000..68427ef
--- /dev/null
+++ b/apps/base/vault/role_k8s-service-registration.yaml
@@ -0,0 +1,24 @@
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: vault-k8s-service-registration
+  namespace: vault
+rules:
+  - apiGroups: [""]
+    resources: ["pods"]
+    verbs: ["get", "update", "patch"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: vault-k8s-service-registration
+  namespace: vault
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: vault-k8s-service-registration
+subjects:
+  - kind: ServiceAccount
+    name: vault
+    namespace: vault
diff --git a/apps/overlays/au-syd1/vault/values.yaml b/apps/overlays/au-syd1/vault/values.yaml
index d1f646a..95744bb 100644
--- a/apps/overlays/au-syd1/vault/values.yaml
+++ b/apps/overlays/au-syd1/vault/values.yaml
@@ -40,9 +40,7 @@ server:
           }
         }
 
-        service_registration "consul" {
-          address = "consul-server.consul.svc.cluster.local:8500"
-        }
+        service_registration "kubernetes" {}
 
   dataStorage:
     enabled: true
@@ -50,6 +48,14 @@ server:
     storageClass: cephrbd-fast-delete
     accessMode: ReadWriteOnce
 
+  extraEnv:
+    - name: VAULT_K8S_NAMESPACE
+      value: vault
+    - name: VAULT_K8S_POD_NAME
+      valueFrom:
+        fieldRef:
+          fieldPath: metadata.name
+
   statefulSet:
     securityContext:
       container: