111 lines
4.0 KiB
Python
111 lines
4.0 KiB
Python
# Copyright 2015 Huawei Technologies Co.,LTD.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from oslo_log import log
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from magnum.common import docker_utils
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from magnum.conductor.monitors import MonitorBase
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from magnum.i18n import _LW
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LOG = log.getLogger(__name__)
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class SwarmMonitor(MonitorBase):
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def __init__(self, context, bay):
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super(SwarmMonitor, self).__init__(context, bay)
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self.data = {}
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self.data['nodes'] = []
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self.data['containers'] = []
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@property
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def metrics_spec(self):
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return {
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'memory_util': {
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'unit': '%',
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'func': 'compute_memory_util',
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},
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}
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def pull_data(self):
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with docker_utils.docker_for_bay(self.context,
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self.bay) as docker:
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system_info = docker.info()
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self.data['nodes'] = self._parse_node_info(system_info)
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# pull data from each container
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containers = []
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for container in docker.containers(all=True):
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try:
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container = docker.inspect_container(container['Id'])
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except Exception as e:
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LOG.warning(_LW("Ignore error [%(e)s] when inspecting "
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"container %(container_id)s."),
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{'e': e, 'container_id': container['Id']},
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exc_info=True)
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containers.append(container)
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self.data['containers'] = containers
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def compute_memory_util(self):
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mem_total = 0
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for node in self.data['nodes']:
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mem_total += node['MemTotal']
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mem_reserved = 0
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for container in self.data['containers']:
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mem_reserved += container['HostConfig']['Memory']
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if mem_total == 0:
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return 0
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else:
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return mem_reserved * 100 / mem_total
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def _parse_node_info(self, system_info):
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"""Parse system_info to retrieve memory size of each node.
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:param system_info: The output returned by docker.info(). Example:
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{
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u'Debug': False,
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u'NEventsListener': 0,
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u'DriverStatus': [
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[u'\x08Strategy', u'spread'],
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[u'\x08Filters', u'...'],
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[u'\x08Nodes', u'2'],
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[u'node1', u'10.0.0.4:2375'],
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[u' \u2514 Containers', u'1'],
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[u' \u2514 Reserved CPUs', u'0 / 1'],
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[u' \u2514 Reserved Memory', u'0 B / 2.052 GiB'],
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[u'node2', u'10.0.0.3:2375'],
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[u' \u2514 Containers', u'2'],
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[u' \u2514 Reserved CPUs', u'0 / 1'],
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[u' \u2514 Reserved Memory', u'0 B / 2.052 GiB']
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],
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u'Containers': 3
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}
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:return: Memory size of each node. Excample:
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[{'MemTotal': 2203318222.848},
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{'MemTotal': 2203318222.848}]
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"""
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nodes = []
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for info in system_info['DriverStatus']:
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key = info[0]
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value = info[1]
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if key == u' \u2514 Reserved Memory':
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memory = value # Example: '0 B / 2.052 GiB'
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memory = memory.split('/')[1].strip() # Example: '2.052 GiB'
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memory = memory.split(' ')[0] # Example: '2.052'
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memory = float(memory) * 1024 * 1024 * 1024
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nodes.append({'MemTotal': memory})
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return nodes
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