From 6da1b3e88e4407c0607cd8f32b343f5415a5f565 Mon Sep 17 00:00:00 2001
From: Ruben Hensen <ruben.hensen@protonmail.com>
Date: Thu, 22 Oct 2026 12:56:21 +0200
Subject: [PATCH] longhorn: upgrade volume engines automatically, one at a time

concurrentAutomaticEngineUpgradePerNodeLimit was 0, so volumes stayed on
the engine image of whatever Longhorn version created them: three on
1.7.1, nine on 1.7.2, seven on 1.7.3. Every hop of the upgrade to 1.11.2
needs all volumes on the current engine first.
---
 apps/templates/longhorn-helm.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/apps/templates/longhorn-helm.yaml b/apps/templates/longhorn-helm.yaml
index 29f2027..11f6f4d 100644
--- a/apps/templates/longhorn-helm.yaml
+++ b/apps/templates/longhorn-helm.yaml
@@ -23,6 +23,10 @@ spec:
             defaultClassReplicaCount: 1
           preUpgradeChecker:
             jobEnabled: false
+          defaultSettings:
+            # Move volumes to the new engine image after each Longhorn
+            # upgrade, one at a time. At 0 they stayed behind on 1.7.1/1.7.2.
+            concurrentAutomaticEngineUpgradePerNodeLimit: 1
         parameters:
           - name: csi.kubeletRootDir
             value: "/var/snap/microk8s/common/var/lib/kubelet"