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fix(longhorn): run CSI attacher/provisioner/resizer with 2 replicas for HA #1658

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fix(longhorn): run CSI attacher/provisioner/resizer with 2 replicas for HA #1658

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11 changes: 11 additions & 0 deletions k8s/clusters/prod/variables/variables-cluster-config-map.yaml
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Expand Up @@ -86,6 +86,17 @@ data:
# CSI snapshotter crash-loops trying to list them. Disable until CRDs
# are added.
longhorn_csi_snapshotter_replicas: "0"
# CSI control-plane sidecars (attacher/provisioner/resizer) default to a
# single replica in the base HelmRelease. They are leader-elected, so a
# second replica is a cheap warm standby that costs ~nothing when idle.
# Run 2 for HA: on 2026-05-28 the sole csi-attacher/provisioner happened to
# sit on a worker whose Cilium ClusterIP datapath had degraded, which took
# out volume attach/detach orchestration cluster-wide (FailedAttachVolume
# storms, pods stuck ContainerCreating). A standby on another node keeps CSI
# functioning through a single-node outage.
longhorn_csi_attacher_replicas: "2"
longhorn_csi_provisioner_replicas: "2"
longhorn_csi_resizer_replicas: "2"
# --- Non-essential services scaled to 0 ---
# Origin CA issuer requests 1 CPU (50% of worker allocatable) for a simple
# cert controller. Disabled until we actually need Cloudflare Origin certs.
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