Method: NewRelic::Agent::SystemInfo.parse_docker_container_id

Defined in:
lib/new_relic/agent/system_info.rb

.parse_docker_container_id(cgroup_info) ⇒ Object

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# File 'lib/new_relic/agent/system_info.rb', line 224

def self.parse_docker_container_id(cgroup_info)
  cpu_cgroup = parse_cgroup_ids(cgroup_info)['cpu']
  return unless cpu_cgroup

  container_id = case cpu_cgroup
  # docker native driver w/out systemd (fs)
  when /[0-9a-f]{64,}/
    if $&.length == 64
      $&
    else # container ID is too long
      ::NewRelic::Agent.logger.debug("Ignoring docker ID of invalid length: '#{cpu_cgroup}'")
      return
    end
  # docker native driver with systemd
  when '/' then nil
  # in a cgroup, but we don't recognize its format
  when /docker\/.*[^0-9a-f]/
    ::NewRelic::Agent.logger.debug("Cgroup indicates docker but container_id has invalid characters: '#{cpu_cgroup}'")
    return
  when /docker/
    ::NewRelic::Agent.logger.debug("Cgroup indicates docker but container_id unrecognized: '#{cpu_cgroup}'")
    ::NewRelic::Agent.increment_metric('Supportability/utilization/docker/error')
    return
  else
    ::NewRelic::Agent.logger.debug("Ignoring unrecognized cgroup ID format: '#{cpu_cgroup}'")
    return
  end

  if container_id && container_id.size != 64
    ::NewRelic::Agent.logger.debug("Found docker container_id with invalid length: #{container_id}")
    ::NewRelic::Agent.increment_metric('Supportability/utilization/docker/error')
    nil
  else
    container_id
  end
end