Metricbeat does not respect on output.file.permissions

Hi, my metricbeat config for file output is this:

  # Boolean flag to enable or disable the output module.
  enabled: True

  # Configure JSON encoding
    # Pretty-print JSON event
    #pretty: false

    # Configure escaping HTML symbols in strings.
    #escape_html: false

  # Path to the directory where to save the generated files. The option is
  # mandatory.
  path: "/var/log/metricbeat/probes"

  # Name of the generated files. The default is `metricbeat` and it generates
  # files: `metricbeat`, `metricbeat.1`, `metricbeat.2`, etc.
  filename: metricbeat_probes.log

  # Maximum size in kilobytes of each file. When this size is reached, and on
  # every Metricbeat restart, the files are rotated. The default value is 10240
  # kB.
  rotate_every_kb: 10240

  # Maximum number of files under path. When this number of files is reached,
  # the oldest file is deleted and the rest are shifted from last to first. The
  # default is 7 files.
  number_of_files: 3

  # Permissions to use for file creation. The default is 0600.
  permissions: 0644

But the created files have 0640 permissions:

[root@elastic01 probes]# pwd
[root@elastic01 probes]# ls -l
total 68
-rw-r-----. 1 metricbeat metricbeat 68454 Apr  9 15:15 metricbeat_probes.log

I am using metricbeat 7.5.2.
I am running metricbeat as unprivilleged user called metricbeat.

Any ideas how to solve this issue?

same issue when running as root

Thanks for posting your question here. I was able to reproduce this issue with master branch Metricbeat. I see INFO log showing:

2020-04-10T13:59:56.887-0600    INFO    [file]  fileout/file.go:100     Initialized file output. path=/Users/kaiyansheng/metricbeat-logs/metricbeat_probes.log max_size_bytes=10485760 max_backups=3 permissions=-rw-r--r--

But still the output log file is

-rw-r-----   1 kaiyansheng  staff    17K Apr 10 13:56 metricbeat_probes.log

Could you please create an issue for this in Beats github repo please?

Here it is

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