puppet hiera无法读取yaml文件

Question

我是puppet的新手。我同样配置了一个路径为/etc/puppetlabs/puppet/hiera.yaml的hiera文件

version: 5

hierarchy: []

backends:
  - yaml

yaml:
  - datadir: /etc/puppetlabs/puppet/some_dir

我得到了这个错误

 Warning: The function 'hiera' is deprecated in favor of using 'lookup'. See https://docs.puppet.com/puppet/5.3/reference/deprecated_language.html
       (file & line not available)
    Error: Evaluation Error: Error while evaluating a Function Call, Lookup of key 'user_dir' failed:  The Lookup Configuration at '/etc/puppetlabs/puppet/hiera.yaml' has wrong type, unrecognized key 'backends'
      The Lookup Configuration at '/etc/puppetlabs/puppet/hiera.yaml' has wrong type, unrecognized key 'yaml' at /etc/puppetlabs/code/environments/production/manifests/site.pp:30:17 on node puppet,some_cluster_DNS.internal

最初，我对keys :backends: :yaml:有这样的格式，但它似乎不是5版本的常规格式，所以我删除了:符号

有人有主意了吗？