From 0cd549652dfe344f11468bb443851b2407e2f01b Mon Sep 17 00:00:00 2001
From: Graham McIntire <graham@mcintire.me>
Date: Wed, 29 Apr 2026 13:55:17 -0500
Subject: [PATCH] k8s: ensure zero-downtime deploys with 1 replica
MIME-Version: 1.0
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- maxSurge: 1 (explicit integer, avoid percentage rounding)
- minReadySeconds: 30 (was 10) — new pod must be stable longer before old is killed
- progressDeadlineSeconds: 600 — detect stuck rollouts
- readinessProbe failureThreshold: 3 (was 2) — more tolerance after old pod is gone
- Add PodDisruptionBudget minAvailable: 1 — prevents voluntary disruptions from dropping below 1 pod
---
 k8s/deployment.yaml    |  7 ++++---
 k8s/kustomization.yaml |  1 +
 k8s/pdb.yaml           | 10 ++++++++++
 3 files changed, 15 insertions(+), 3 deletions(-)
 create mode 100644 k8s/pdb.yaml

diff --git a/k8s/deployment.yaml b/k8s/deployment.yaml
index a925d01..e39d6d5 100644
--- a/k8s/deployment.yaml
+++ b/k8s/deployment.yaml
@@ -8,9 +8,10 @@ spec:
   strategy:
     type: RollingUpdate
     rollingUpdate:
-      maxSurge: 100%
+      maxSurge: 1
       maxUnavailable: 0
-  minReadySeconds: 10
+  minReadySeconds: 30
+  progressDeadlineSeconds: 600
   selector:
     matchLabels:
       app: aprs
@@ -184,4 +185,4 @@ spec:
             periodSeconds: 5
             timeoutSeconds: 2
             successThreshold: 1
-            failureThreshold: 2
+            failureThreshold: 3
diff --git a/k8s/kustomization.yaml b/k8s/kustomization.yaml
index ef23ab3..f04592e 100644
--- a/k8s/kustomization.yaml
+++ b/k8s/kustomization.yaml
@@ -6,3 +6,4 @@ resources:
   - deployment.yaml
   - service.yaml
   - service-headless.yaml
+  - pdb.yaml
diff --git a/k8s/pdb.yaml b/k8s/pdb.yaml
new file mode 100644
index 0000000..844ff3f
--- /dev/null
+++ b/k8s/pdb.yaml
@@ -0,0 +1,10 @@
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: aprs
+  namespace: aprs
+spec:
+  minAvailable: 1
+  selector:
+    matchLabels:
+      app: aprs