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Container resource stats cannot be obtained via rest API in Windows containers

docker

(Yamackurtulus) #1

Hello everyone.

I am running docker for Windows on Windows 10 with 1709 update with Windows containers. Docker version is 17.09.0-ce-win33 stable. (Though I have tried it on latest edge distro) I am trying to access container stats via REST API from localhost. http://localhost:2375/containers/some-container-id/stats returns 0 on some fields, either with or without stream option. The output is as follows.

> {
>   "read": "2017-11-25T23:53:12.4978866Z",
>   "preread": "2017-11-25T23:53:11.4979728Z",
>   "pids_stats": {
>     
>   },
>   "blkio_stats": {
>     "io_service_bytes_recursive": null,
>     "io_serviced_recursive": null,
>     "io_queue_recursive": null,dock
>     "io_service_time_recursive": null,
>     "io_wait_time_recursive": null,
>     "io_merged_recursive": null,
>     "io_time_recursive": null,
>     "sectors_recursive": null
>   },
>   "num_procs": 4,
>   "storage_stats": {
>     "read_count_normalized": 2196,
>     "read_size_bytes": 16348672,
>     "write_count_normalized": 2543,
>     "write_size_bytes": 18244608
>   },
>   "cpu_stats": {
>     "cpu_usage": {
>       "total_usage": 94521638,
>       "usage_in_kernelmode": 0,
>       "usage_in_usermode": 0
>     },
>     "throttling_data": {
>       "periods": 0,
>       "throttled_periods": 0,
>       "throttled_time": 0
>     }
>   },
>   "precpu_stats": {
>     "cpu_usage": {
>       "total_usage": 94507005,
>       "usage_in_kernelmode": 0,
>       "usage_in_usermode": 0
>     },
>     "throttling_data": {
>       "periods": 0,
>       "throttled_periods": 0,
>       "throttled_time": 0
>     }
>   },
>   "memory_stats": {
>     "commitbytes": 1083678720,
>     "commitpeakbytes": 1084067840,
>     "privateworkingset": 89411584
>   },
>   "name": "\/tracker_webapi_1",
>   "id": "1803b3b2ae4df306a2308b8e1263fd6b1dc03af2d2cd649559b251d02ff58f13",
>   "networks": {
>     "754f669d-feff-49f2-ab15-7c76a6c4e73f": {
>       "rx_bytes": 0,
>       "rx_packets": 0,
>       "rx_errors": 0,
>       "rx_dropped": 0,
>       "tx_bytes": 0,
>       "tx_packets": 0,
>       "tx_errors": 0,
>       "tx_dropped": 0
>     }
>   }
> }

As you can see there’s a lot of 0s and nulls. I would expect to see some data in blkio_stats or cpu_usage. Other API functions seem alright, such as container http://localhost:2375/containers/json etc (and if there is a problem, I do not know yet) but stats is causing problem. Calling docker stats fom powershell works alright.
image

When I switch to linux containers, it works ok. The JSON structure that returns is different as well:

{
  "read": "2017-11-26T00:03:58.2432189Z",
  "preread": "2017-11-26T00:03:57.2426677Z",
  "pids_stats": {
    "current": 75
  },
  "blkio_stats": {
    "io_service_bytes_recursive": [
      {
        "major": 8,
        "minor": 0,
        "op": "Read",
        "value": 0
      },
      {
        "major": 8,
        "minor": 0,
        "op": "Write",
        "value": 389120
      },
      {
        "major": 8,
        "minor": 0,
        "op": "Sync",
        "value": 360448
      },
      {
        "major": 8,
        "minor": 0,
        "op": "Async",
        "value": 28672
      },
      {
        "major": 8,
        "minor": 0,
        "op": "Total",
        "value": 389120
      }
    ],
    "io_serviced_recursive": [
      {
        "major": 8,
        "minor": 0,
        "op": "Read",
        "value": 0
      },
      {
        "major": 8,
        "minor": 0,
        "op": "Write",
        "value": 75
      },
      {
        "major": 8,
        "minor": 0,
        "op": "Sync",
        "value": 68
      },
      {
        "major": 8,
        "minor": 0,
        "op": "Async",
        "value": 7
      },
      {
        "major": 8,
        "minor": 0,
        "op": "Total",
        "value": 75
      }
    ],
    "io_queue_recursive": [
      
    ],
    "io_service_time_recursive": [
      
    ],
    "io_wait_time_recursive": [
      
    ],
    "io_merged_recursive": [
      
    ],
    "io_time_recursive": [
      
    ],
    "sectors_recursive": [
      
    ]
  },
  "num_procs": 0,
  "storage_stats": {
    
  },
  "cpu_stats": {
    "cpu_usage": {
      "total_usage": 14608679301,
      "percpu_usage": [
        9723550801,
        4885128500,
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      "usage_in_kernelmode": 5840000000,
      "usage_in_usermode": 8680000000
    },
    "system_cpu_usage": 7049490000000,
    "online_cpus": 2,
    "throttling_data": {
      "periods": 0,
      "throttled_periods": 0,
      "throttled_time": 0
    }
  },
  "precpu_stats": {
    "cpu_usage": {
      "total_usage": 14607358231,
      "percpu_usage": [
        9722418623,
        4884939608,
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      "usage_in_kernelmode": 5840000000,
      "usage_in_usermode": 8680000000
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    "system_cpu_usage": 7047530000000,
    "online_cpus": 2,
    "throttling_data": {
      "periods": 0,
      "throttled_periods": 0,
      "throttled_time": 0
    }
  },
  "memory_stats": {
    "usage": 77393920,
    "max_usage": 80232448,
    "stats": {
      "active_anon": 70942720,
      "active_file": 69632,
      "cache": 151552,
      "dirty": 0,
      "hierarchical_memory_limit": 9.2233720368548e+18,
      "hierarchical_memsw_limit": 9.2233720368548e+18,
      "inactive_anon": 0,
      "inactive_file": 81920,
      "mapped_file": 0,
      "pgfault": 140336,
      "pgmajfault": 0,
      "pgpgin": 89629,
      "pgpgout": 72272,
      "rss": 70942720,
      "rss_huge": 0,
      "swap": 0,
      "total_active_anon": 70942720,
      "total_active_file": 69632,
      "total_cache": 151552,
      "total_dirty": 0,
      "total_inactive_anon": 0,
      "total_inactive_file": 81920,
      "total_mapped_file": 0,
      "total_pgfault": 140336,
      "total_pgmajfault": 0,
      "total_pgpgin": 89629,
      "total_pgpgout": 72272,
      "total_rss": 70942720,
      "total_rss_huge": 0,
      "total_swap": 0,
      "total_unevictable": 0,
      "total_writeback": 0,
      "unevictable": 0,
      "writeback": 0
    },
    "limit": 2076430336
  },
  "name": "\/rabbit",
  "id": "cdc291fd78a0bf7aa8212befbbf08fc9c619529aee313ac1f3f6ffac8b239231",
  "networks": {
    "eth0": {
      "rx_bytes": 5796,
      "rx_packets": 140,
      "rx_errors": 0,
      "rx_dropped": 0,
      "tx_bytes": 0,
      "tx_packets": 0,
      "tx_errors": 0,
      "tx_dropped": 0
    }
  }
}

I was unable to find any information on this issue. Am I missing something, is there a workaround, or shall i wait until these issues are resolved by Docker or Windows? Any help is greatly appreciated.
Thank you and have a great day :slight_smile: