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 oslo_utils import strutils
from magnum.common import utils
from magnum.conductor import k8s_api as k8s
from magnum.conductor import monitors
from magnum.objects import fields as m_fields
class K8sMonitor(monitors.MonitorBase):
def __init__(self, context, cluster):
super(K8sMonitor, self).__init__(context, cluster)
self.data = {}
self.data['nodes'] = []
self.data['pods'] = []
@property
def metrics_spec(self):
return {
'memory_util': {
'unit': '%',
'func': 'compute_memory_util',
},
'cpu_util': {
'unit': '%',
'func': 'compute_cpu_util',
},
}
def pull_data(self):
k8s_api = k8s.create_k8s_api(self.context, self.cluster)
nodes = k8s_api.list_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 poll_health_status(self):
k8s_api = k8s.create_k8s_api(self.context, self.cluster)
status, reason = self._poll_health_status(k8s_api)
self.data['health_status'] = status
self.data['health_status_reason'] = reason
def _compute_res_util(self, res):
res_total = 0
for node in self.data['nodes']:
res_total += node[res]
res_reserved = 0
for pod in self.data['pods']:
res_reserved += pod[res]
if res_total == 0:
return 0
else:
return res_reserved * 100 / res_total
def compute_memory_util(self):
return self._compute_res_util('Memory')
def compute_cpu_util(self):
return self._compute_res_util('Cpu')
def _parse_pod_info(self, pods):
"""Parse pods and retrieve memory and cpu details about each pod
:param pods: The output of k8s_api.list_namespaced_pod()
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'cpu': u'500m',
u'memory': u'1280e3'}"},
}],
},
'api_version': None,
}],
'kind': 'PodList',
}
The above output is the dict form of:
k8sclient.client.models.v1_pod_list.
V1PodList object
:return: Memory size of each pod. Example:
[{'Memory': 1280000.0, cpu: 0.5},
{'Memory': 1280000.0, cpu: 0.5}]
"""
pods = pods.items
parsed_containers = []
for pod in pods:
containers = pod.spec.containers
for container in containers:
memory = 0
cpu = 0
resources = container.resources
limits = resources.limits
if limits is not None:
# Output of resources.limits is string
# for example:
# limits = "{cpu': '500m': 'memory': '1000Ki'}"
limits = ast.literal_eval(limits)
if limits.get('memory', ''):
memory = utils.get_k8s_quantity(limits['memory'])
if limits.get('cpu', ''):
cpu = utils.get_k8s_quantity(limits['cpu'])
container_dict = {
'Memory': memory,
'Cpu': cpu,
}
parsed_containers.append(container_dict)
return parsed_containers
def _parse_node_info(self, nodes):
"""Parse nodes to retrieve memory and cpu of each node
:param nodes: The output of k8s_api.list_namespaced_node()
For example:
{
'items': [{
'status': {
'phase': None,
'capacity': "{u'cpu': u'1',
u'memory': u'2049852Ki'}",
},
}],
'api_version': None,
'kind': 'NodeList',
'api_version': 'v1',
}
The above output is the dict form of:
k8sclient.client.models.v1_node_list.
V1NodeList object
:return: CPU core number and Memory size of each node. Example:
[{'cpu': 1, 'Memory': 1024.0},
{'cpu': 1, 'Memory': 1024.0}]
"""
nodes = nodes.items
parsed_nodes = []
for node in nodes:
# Output of node.status.capacity is strong
# for example:
# capacity = "{'cpu': '1', 'memory': '1000Ki'}"
capacity = node.status.capacity
memory = utils.get_k8s_quantity(capacity['memory'])
cpu = int(capacity['cpu'])
parsed_nodes.append({'Memory': memory, 'Cpu': cpu})
return parsed_nodes
def _poll_health_status(self, k8s_api):
"""Poll health status of API and nodes for given cluster
Design Policy:
1. How to calculate the overall health status?
Any node (including API and minion nodes) is not OK, then the
overall health status is UNHEALTHY
2. The data structure of health_status_reason
As an attribute of the cluster, the health_status_reason have to
use the field type from
oslo.versionedobjects/blob/master/oslo_versionedobjects/fields.py
3. How to get the health_status and health_status_reason?
3.1 Call /healthz to get the API health status
3.2 Call list_node (using API /api/v1/nodes) to get the nodes
health status
:param k8s_api: The api client to the cluster
:return: Tumple including status and reason. Example:
(
ClusterHealthStatus.HEALTHY,
{
'api': 'ok',
'k8scluster-ydz7cfbxqqu3-node-0.Ready': False,
'k8scluster-ydz7cfbxqqu3-node-1.Ready': True,
'k8scluster-ydz7cfbxqqu3-node-2.Ready': True,
}
)
"""
health_status = m_fields.ClusterHealthStatus.UNHEALTHY
health_status_reason = {}
api_status = None
try:
api_status, _, _ = k8s_api.api_client.call_api(
'/healthz', 'GET', response_type=object)
for node in k8s_api.list_node().items:
node_key = node.metadata.name + ".Ready"
ready = False
for condition in node.status.conditions:
if condition.type == 'Ready':
ready = strutils.bool_from_string(condition.status)
break
health_status_reason[node_key] = ready
if (api_status == 'ok' and
all(n for n in health_status_reason.values())):
health_status = m_fields.ClusterHealthStatus.HEALTHY
health_status_reason['api'] = api_status
except Exception as exp_api:
if not api_status:
api_status = (getattr(exp_api, 'body', None) or
getattr(exp_api, 'message', None))
health_status_reason['api'] = api_status
return health_status, health_status_reason