checks/docker_container_mem

   1 #!/usr/bin/python
   2 # -*- encoding: utf-8; py-indent-offset: 4 -*-
   3 # +------------------------------------------------------------------+
   4 # |             ____ _               _        __  __ _  __           |
   5 # |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
   6 # |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
   7 # |           | |___| | | |  __/ (__|   <    | |  | | . \            |
   8 # |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
   9 # |                                                                  |
  10 # | Copyright Mathias Kettner 2018             mk@mathias-kettner.de |
  11 # +------------------------------------------------------------------+
  12 #
  13 # This file is part of Check_MK.
  14 # The official homepage is at http://mathias-kettner.de/check_mk.
  15 #
  16 # check_mk is free software;  you can redistribute it and/or modify it
  17 # under the  terms of the  GNU General Public License  as published by
  18 # the Free Software Foundation in version 2.  check_mk is  distributed
  19 # in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
  20 # out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
  21 # PARTICULAR PURPOSE. See the  GNU General Public License for more de-
  22 # tails. You should have  received  a copy of the  GNU  General Public
  23 # License along with GNU Make; see the file  COPYING.  If  not,  write
  24 # to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
  25 # Boston, MA 02110-1301 USA.
  26
  27
  28 def parse_docker_container_mem(info):
  29     # parsed contains memory usages in bytes
  30     parsed = {}
  31     for line in info:
  32         if line[0] == "MemTotal:" and line[2] == "kB":
  33             parsed["MemTotal"] = int(line[1]) * 1024
  34         else:
  35             parsed[line[0]] = int(line[1])
  36
  37     # Populate a dictionary in the format check_memory() form mem.include expects.
  38     # The values are scaled to kB
  39     mem = {
  40         "SwapTotal": 0,
  41         "SwapFree": 0,
  42     }
  43
  44     # Calculate used memory like docker does (https://github.com/moby/moby/issues/10824)
  45     usage_kb = (parsed["usage_in_bytes"] - parsed["cache"]) / 1024.0
  46
  47     # Extract the real memory limit for the container. There is either the
  48     # maximum amount of memory available or a configured limit for the
  49     # container (cgroup).
  50     mem["MemTotal"] = min(parsed["MemTotal"], parsed["limit_in_bytes"]) / 1024.0
  51     mem["MemFree"] = mem["MemTotal"] - usage_kb
  52     mem["Caches"] = parsed["cache"] / 1024.0
  53
  54     return mem
  55
  56
  57 def check_docker_container_mem(_no_item, params, parsed):
  58     return check_memory(params, parsed)
  59
  60
  61 check_info["docker_container_mem"] = {
  62     "parse_function": parse_docker_container_mem,
  63     "inventory_function": discover_single,
  64     "check_function": check_docker_container_mem,
  65     "service_description": "Memory used",
  66     "has_perfdata": True,
  67     "group": "memory",
  68     "default_levels_variable": "memory_default_levels",
  69     "includes": ["mem.include"],
  70 }