Merge pull request k3s-io#438 from axivo/feature/automatic-engine-upgrade

feat: concurrent automatic engine upgrade limit

Author: fmunteanu

roles/longhorn/README.md

@@ -17,6 +17,7 @@ See the related role variables listed below, defined into [main.yaml](./defaults
 | longhorn_vars.kubernetes.backup.enabled | bool | `true` |  |
 | longhorn_vars.kubernetes.backup.target | string | `"cifs://192.168.1.8/backup"` | See [documentation](https://longhorn.io/docs/latest/snapshots-and-backups/backup-and-restore/set-backup-target), for details |
 | longhorn_vars.kubernetes.default_settings.collect_usage_metrics | bool | `false` | See [documentation](https://longhorn.io/docs/latest/references/settings/#allow-collecting-longhorn-usage-metrics), for details |
+| longhorn_vars.kubernetes.default_settings.concurrent_automatic_engine_upgrade_limit | int | `1` | See [documentation](https://longhorn.io/docs/latest/references/settings/#concurrent-automatic-engine-upgrade-per-node-limit), for details |
 | longhorn_vars.kubernetes.default_settings.data_locality | string | `"strict-local"` | See [documentation](https://longhorn.io/docs/latest/references/settings/#allow-collecting-longhorn-usage-metrics), for details |
 | longhorn_vars.kubernetes.default_settings.log_level | string | `"Warn"` |  |
 | longhorn_vars.kubernetes.default_settings.node_drain_policy | string | `"block-for-eviction"` | See [documentation](https://longhorn.io/docs/latest/references/settings/#node-drain-policy), for details |

roles/longhorn/defaults/main.yaml

@@ -8,6 +8,8 @@ longhorn_vars:
     default_settings:
       # -- See [documentation](https://longhorn.io/docs/latest/references/settings/#allow-collecting-longhorn-usage-metrics), for details
       collect_usage_metrics: false
+      # -- See [documentation](https://longhorn.io/docs/latest/references/settings/#concurrent-automatic-engine-upgrade-per-node-limit), for details
+      concurrent_automatic_engine_upgrade_limit: 1
       # -- See [documentation](https://longhorn.io/docs/latest/references/settings/#allow-collecting-longhorn-usage-metrics), for details
       data_locality: strict-local
       log_level: Warn

roles/longhorn/templates/values.j2

@@ -10,6 +10,7 @@ defaultSettings:
   autoCleanupRecurringJobBackupSnapshot: true
   autoCleanupSnapshotWhenDeleteBackup: true
   autoCleanupSystemGeneratedSnapshot: true
+  concurrentAutomaticEngineUpgradePerNodeLimit: {{ longhorn_vars.kubernetes.default_settings.concurrent_automatic_engine_upgrade_limit }}
   defaultDataLocality: {{ longhorn_vars.kubernetes.default_settings.data_locality }}
   defaultDataPath: {{ longhorn_map.directory.data }}
 {% if longhorn_vars.kubernetes.default_settings.volume.replicas < 2 %}