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try:
# py2/3
import simplejson as json
except ImportError:
# py2
import json
import time
import ddt
from glusto.core import Glusto as g
import pytest
from openshiftstoragelibs import baseclass
from openshiftstoragelibs import exceptions
from openshiftstoragelibs import openshift_ops
from openshiftstoragelibs import waiter
@ddt.ddt
class TestPrometheusValidationFile(baseclass.BaseClass):
"""Prometheus Validations for file volumes"""
@classmethod
def setUpClass(cls):
super(TestPrometheusValidationFile, cls).setUpClass()
# Metrics of which the data need to retrieve in this class
cls.metrics = ('kubelet_volume_stats_inodes_free',
'kubelet_volume_stats_inodes',
'kubelet_volume_stats_inodes_used',
'kubelet_volume_stats_available_bytes',
'kubelet_volume_stats_capacity_bytes',
'kubelet_volume_stats_used_bytes')
def setUp(self):
"""Initialize all the variables which are necessary for test cases"""
super(TestPrometheusValidationFile, self).setUp()
try:
prometheus_config = g.config['openshift']['prometheus']
self._prometheus_project_name = prometheus_config[
'prometheus_project_name']
self._prometheus_resources_selector = prometheus_config[
'prometheus_resources_selector']
self._alertmanager_resources_selector = prometheus_config[
'alertmanager_resources_selector']
except KeyError as err:
self.skipTest("Config file doesn't have key {}".format(err))
self._master = self.ocp_master_node[0]
def _fetch_metric_from_promtheus_pod(self, metric):
"""Fetch metric from prometheus pod using api call"""
prometheus_pods = list(openshift_ops.oc_get_pods(
self._master, selector=self._prometheus_resources_selector).keys())
fetch_metric_cmd = ("curl 'http://localhost:9090/api/v1/query"
"?query={}'".format(metric))
ret, metric_data, _ = openshift_ops.oc_rsh(
self._master, prometheus_pods[0], fetch_metric_cmd)
metric_result = json.loads(metric_data)["data"]["result"]
if (not metric_result) or ret:
raise exceptions.ExecutionError(
"Failed to fecth data for metric {}, output {}".format(
metric, metric_result))
return metric_result
def _get_and_manipulate_metric_data(self, metrics, pvc):
"""Create a dict of metric names and total values"""
# Switch to namespace containing prometheus pods
openshift_ops.switch_oc_project(self._master,
self._prometheus_project_name)
self.addCleanup(openshift_ops.switch_oc_project,
self._master, self.storage_project_name)
metric_data = dict()
for metric in metrics:
out = self._fetch_metric_from_promtheus_pod(metric)
for matric_result in out:
if matric_result["metric"]["persistentvolumeclaim"] == pvc:
metric_data[matric_result["metric"][
"__name__"]] = matric_result["value"][1]
return metric_data
def _fetch_initial_metrics(self, volume_expansion=False):
# Create PVC and wait for it to be in 'Bound' state
sc_name = self.create_storage_class(
allow_volume_expansion=volume_expansion)
pvc_name = self.create_and_wait_for_pvc(sc_name=sc_name)
# Create DC and attach with pvc
dc_name, pod_name = self.create_dc_with_pvc(pvc_name)
for w in waiter.Waiter(120, 10):
initial_metrics = self._get_and_manipulate_metric_data(
self.metrics, pvc_name)
if bool(initial_metrics) and len(initial_metrics) == 6:
break
if w.expired:
raise AssertionError("Unable to fetch metrics for the pvc")
return pvc_name, pod_name, initial_metrics
def _perform_io_and_fetch_metrics(
self, pod_name, pvc_name, filename, dirname,
metric_data, operation):
"""Create 1000 files and dirs and validate with old metrics"""
openshift_ops.switch_oc_project(
self._master, self.storage_project_name)
if operation == "create":
cmds = ("touch /mnt/{}{{1..1000}}".format(filename),
"mkdir /mnt/{}{{1..1000}}".format(dirname))
else:
cmds = ("rm -rf /mnt/large_file",
"rm -rf /mnt/{}{{1..1000}}".format(filename),
"rm -rf /mnt/{}{{1..1000}}".format(dirname))
for cmd in cmds:
self.cmd_run("oc rsh {} {}".format(pod_name, cmd))
# Fetch the new metrics and compare the inodes used and bytes used
for w in waiter.Waiter(120, 10):
after_io_metrics = self._get_and_manipulate_metric_data(
self.metrics, pvc_name)
if operation == "create":
if (int(after_io_metrics[
'kubelet_volume_stats_inodes_used']) > int(
metric_data['kubelet_volume_stats_inodes_used']) and int(
after_io_metrics[
'kubelet_volume_stats_used_bytes']) > int(
metric_data['kubelet_volume_stats_used_bytes'])):
break
else:
if int(metric_data[
'kubelet_volume_stats_used_bytes']) > int(
after_io_metrics['kubelet_volume_stats_used_bytes']):
break
if w.expired:
raise AssertionError(
"After data is modified metrics like bytes used and inodes "
"used are not reflected in prometheus")
def _run_io_on_the_pod(self, pod_name, number_of_files):
for each in range(number_of_files):
cmd = "touch /mnt/file{}".format(each)
ret, _, err = openshift_ops.oc_rsh(self._master, pod_name, cmd)
self.assertFalse(ret, "Failed to run the IO with error msg {}".
format(err))
@pytest.mark.tier2
def test_prometheus_volume_metrics_on_pod_restart(self):
"""Validate volume metrics using prometheus before and after pod
restart"""
# Create PVC and wait for it to be in 'Bound' state
pvc_name = self.create_and_wait_for_pvc()
pod_name = openshift_ops.oc_create_tiny_pod_with_volume(
self._master, pvc_name, "autotest-volume",
image=self.io_container_image_cirros)
self.addCleanup(openshift_ops.oc_delete, self._master, 'pod', pod_name,
raise_on_absence=False)
# Wait for POD be up and running
openshift_ops.wait_for_pod_be_ready(
self._master, pod_name, timeout=60, wait_step=2)
# Write data on the volume and wait for 2 mins and sleep is must for
# prometheus to get the exact values of the metrics
self._run_io_on_the_pod(pod_name, 30)
time.sleep(120)
# Fetching the metrics and storing in initial_metrics as dictionary
initial_metrics = self._get_and_manipulate_metric_data(
self.metrics, pvc_name)
# Mark the current node unschedulable on which app pod is running
openshift_ops.switch_oc_project(
self._master, self.storage_project_name)
pod_info = openshift_ops.oc_get_pods(self._master, name=pod_name)
openshift_ops.oc_adm_manage_node(
self._master, '--schedulable=false',
nodes=[pod_info[pod_name]["node"]])
self.addCleanup(
openshift_ops.oc_adm_manage_node, self._master,
'--schedulable=true', nodes=[pod_info[pod_name]["node"]])
# Delete the existing pod and create a new pod
openshift_ops.oc_delete(self._master, 'pod', pod_name)
pod_name = openshift_ops.oc_create_tiny_pod_with_volume(
self._master, pvc_name, "autotest-volume")
self.addCleanup(openshift_ops.oc_delete, self._master, 'pod', pod_name)
# Wait for POD be up and running and prometheus to refresh the data
openshift_ops.wait_for_pod_be_ready(
self._master, pod_name, timeout=60, wait_step=2)
time.sleep(120)
# Fetching the metrics and storing in final_metrics as dictionary and
# validating with initial_metrics
final_metrics = self._get_and_manipulate_metric_data(
self.metrics, pvc_name)
self.assertEqual(dict(initial_metrics), dict(final_metrics),
"Metrics are different post pod restart")
@pytest.mark.tier2
def test_prometheus_basic_validation(self):
""" Validate basic volume metrics using prometheus """
# Fetch the metrics and storing initial_metrics as dictionary
pvc_name, pod_name, initial_metrics = self._fetch_initial_metrics(
volume_expansion=False)
# Create 1000 files and fetch the metrics that the data is updated
self._perform_io_and_fetch_metrics(
pod_name=pod_name, pvc_name=pvc_name,
filename="filename1", dirname="dirname1",
metric_data=initial_metrics, operation="create")
# Write the IO half the size of the volume and validated from
# prometheus pod that the size change is reflected
size_to_write = int(initial_metrics[
'kubelet_volume_stats_capacity_bytes']) // 2
openshift_ops.switch_oc_project(
self._master, self.storage_project_name)
cmd = ("dd if=/dev/urandom of=/mnt/large_file bs={} count=1024".
format(size_to_write // 1024))
ret, _, err = openshift_ops.oc_rsh(self._master, pod_name, cmd)
self.assertFalse(ret, 'Failed to write file due to err {}'.format(err))
# Fetching the metrics and validating the data change is reflected
for w in waiter.Waiter(120, 10):
half_io_metrics = self._get_and_manipulate_metric_data(
['kubelet_volume_stats_used_bytes'], pvc_name)
if bool(half_io_metrics) and (int(
half_io_metrics['kubelet_volume_stats_used_bytes'])
> size_to_write):
break
if w.expired:
raise AssertionError(
"After Data is written on the pvc, metrics like inodes used "
"and bytes used are not reflected in the prometheus")
# Delete the files from the volume and wait for the
# updated details reflected in prometheus
self._perform_io_and_fetch_metrics(
pod_name=pod_name, pvc_name=pvc_name,
filename="filename1", dirname="dirname1",
metric_data=half_io_metrics, operation="delete")
|
