# 给每个节点下发 NFS 客户端 sunrpc 调优参数（用户提供的腾讯云侧经验值）：
#   options sunrpc tcp_slot_table_entries=128
#   options sunrpc tcp_max_slot_table_entries=128
# 写到 /etc/modprobe.d/sunrpc.conf，节点下次加载 sunrpc 模块时生效（持久）。
# 高并发 NFS 下可避免 "RPC: task blocked"。放在 kube-system，跑完可删。
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: sunrpc-tuning
  namespace: kube-system
spec:
  selector:
    matchLabels:
      app: sunrpc-tuning
  template:
    metadata:
      labels:
        app: sunrpc-tuning
    spec:
      hostPID: false
      containers:
        - name: write
          image: registry.example.com/dsh/dshs:0.2.0
          command:
            - sh
            - -ec
            - |
              mkdir -p /host/etc/modprobe.d
              printf 'options sunrpc tcp_slot_table_entries=128\noptions sunrpc tcp_max_slot_table_entries=128\n' > /host/etc/modprobe.d/sunrpc.conf
              echo "wrote sunrpc.conf:"; cat /host/etc/modprobe.d/sunrpc.conf
              sleep infinity
          securityContext:
            privileged: true
          volumeMounts:
            - name: modprobe
              mountPath: /host/etc/modprobe.d
      volumes:
        - name: modprobe
          hostPath:
            path: /etc/modprobe.d
            type: DirectoryOrCreate