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