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