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.
import ast
from magnum.common import utils
from magnum.conductor import k8s_api as k8s
from magnum.conductor.monitors import MonitorBase
class K8sMonitor(MonitorBase):
def __init__(self, context, bay):
super(K8sMonitor, self).__init__(context, bay)
self.data = {}
self.data['nodes'] = []
self.data['pods'] = []
@property
def metrics_spec(self):
return {
'memory_util': {
'unit': '%',
'func': 'compute_memory_util',
},
}
def pull_data(self):
k8s_api = k8s.create_k8s_api(self.context, self.bay)
nodes = k8s_api.list_namespaced_node()
self.data['nodes'] = self._parse_node_info(nodes)
pods = k8s_api.list_namespaced_pod('default')
self.data['pods'] = self._parse_pod_info(pods)
def compute_memory_util(self):
mem_total = 0
for node in self.data['nodes']:
mem_total += node['Memory']
mem_reserved = 0
for pod in self.data['pods']:
mem_reserved += pod['Memory']
if mem_total == 0:
return 0
else:
return mem_reserved * 100 / mem_total
def _parse_pod_info(self, pods):
"""Parse pods and retrieve memory details about each pod
:param pods: The output of k8s_api.list_namespaced_pods()
For example:
{
'items': [{
'status': {
'container_statuses': None,
'pod_ip': None,
'phase': 'Pending',
'message': None,
'conditions': None,
},
'spec': {
'containers': [{
'image': 'nginx',
'resources': {'requests': None,
'limits': "{u'memory': u'1280e3'}"},
}],
},
'api_version': None,
}],
'kind': 'PodList',
}
The above output is the dict form of:
magnum.common.pythonk8sclient.swagger_client.models.v1_pod_list.
V1PodList object
:return: Memory size of each pod. Example:
[{'Memory': 1280000.0},
{'Memory': 1280000.0}]
"""
pods = pods.items
parsed_containers = []
for pod in pods:
containers = pod.spec.containers
for container in containers:
memory = 0
resources = container.resources
limits = resources.limits
if limits is not None:
# Output of resources.limits is string
# for example:
# limits = "{'memory': '1000Ki'}"
limits = ast.literal_eval(limits)
if limits.get('memory', ''):
memory = utils.get_memory_bytes(limits['memory'])
container_dict = {
'Memory': memory
}
parsed_containers.append(container_dict)
return parsed_containers
def _parse_node_info(self, nodes):
"""Parse nodes to retrieve memory of each node
:param nodes: The output of k8s_api.list_namespaced_node()
For example:
{
'items': [{
'status': {
'phase': None,
'capacity': "{u'memory': u'2049852Ki'}",
},
},
'api_version': None,
}],
'kind': 'NodeList',
'api_version': 'v1',
}
The above output is the dict form of:
magnum.common.pythonk8sclient.swagger_client.models.v1_node_list.
V1NodeList object
:return: Memory size of each node. Excample:
[{'Memory': 1024.0},
{'Memory': 1024.0}]
"""
nodes = nodes.items
parsed_nodes = []
for node in nodes:
# Output of node.status.capacity is strong
# for example:
# capacity = "{'memory': '1000Ki'}"
capacity = ast.literal_eval(node.status.capacity)
memory = utils.get_memory_bytes(capacity['memory'])
parsed_nodes.append({'Memory': memory})
return parsed_nodes