docker1.5の新機能[stats]を使用して、外部からリソース状況を拾ってみる。 ref: http://qiita.com/_BSmile_/items/0a02d28911f77898bf89

docker

# Modify these options if you want to change the way the docker daemon runs
# OPTIONS=--selinux-enabled -H fd://
OPTIONS=--selinux-enabled -H fd:// -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

# Location used for temporary files, such as those created by
# docker load and build operations. Default is /var/lib/docker/tmp
# Can be overriden by setting the following environment variable.
# DOCKER_TMPDIR=/var/tmp

file0.txt

# docker stats cadvisor

  CONTAINER           CPU %               MEM USAGE/LIMIT      MEM %               NET I/O
  cadvisor            1.66%               25.3 MiB/3.704 GiB   0.67%               11.23 MiB/27.22 MiB

file2.txt

# systemctl restart docker.service

file3.txt

# firewall-cmd --add-port=2375/tcp

file4.txt

$ curl -X GET http://127.0.0.1:2375/containers/[container id]/stats

file5.txt

$ curl -X GET http://127.0.0.1:2375/containers/[container id]/stats --max-time 1 | jq '.cpu_stats'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                         Dload  Upload   Total   Spent    Left  Speed
100  1961    0  1961    0     0   1210      0 --:--:--  0:00:01 --:--:--  1210
curl: (28) Operation timed out after 1620 milliseconds with 1961 out of -1 bytes received
{
  "throttling_data": {
    "throttled_time": 0,
    "throttled_periods": 0,
    "periods": 0
  },
  "system_cpu_usage": 1.01798489e+15,
  "cpu_usage": {
    "usage_in_usermode": 1.0411e+11,
    "usage_in_kernelmode": 5.916e+10,
    "percpu_usage": [
      99302252799,
      101617606123
    ],
    "total_usage": 200919858922
  }
}

file6.txt

# curl -s -X GET http://127.0.0.1:2375/containers/[container id]/stats --max-time 1 | jq '.cpu_stats'
{
  "throttling_data": {
    "throttled_time": 0,
    "throttled_periods": 0,
    "periods": 0
  },
  "system_cpu_usage": 2.03790306e+15,
  "cpu_usage": {
    "usage_in_usermode": 5.0961e+11,
    "usage_in_kernelmode": 3.5196e+11,
    "percpu_usage": [
      445562955080,
      439404240147
    ],
    "total_usage": 884967195227
  }
}