class LogStash::Filters::Kubernetes

This filter plugin allows you extract Pod, Namespace, etc from kubernetes. The way this filter works is very simple. It looks at an event field which contains full path to kubelet created symlinks to docker container logs and extracts useful information from a symlink name. No access to Kubernetes API is required.

Public Instance Methods

filter(event) click to toggle source
# File lib/logstash/filters/kubernetes.rb, line 46
def filter(event)

  if @source and event[@source]
    parts = event[@source].split(File::SEPARATOR).last.gsub(/.log$/, '').split('_')

    # We do not care about empty POD log files
    if parts.length != 3 || parts[2].start_with?('POD-')
      return
    else
      kubernetes = {}
      kubernetes['replication_controller'] = parts[0].gsub(/-[0-9a-z]*$/, '')
      kubernetes['pod'] = parts[0]
      kubernetes['namespace'] = parts[1]
      kubernetes['container_name'] = parts[2].gsub(/-[0-9a-z]*$/, '')
      kubernetes['container_id'] = parts[2].split('-').last

      event[@target] = kubernetes
    end
  end

  # filter_matched should go in the last line of our successful code
  filter_matched(event)
end
register() click to toggle source
# File lib/logstash/filters/kubernetes.rb, line 41
def register
  # Nothing to do
end