Add rolling downtime simulation tools
These tools help simulate rolling downtime by taking down service containers in a controlled fashion. While this can be done manually, using a script to inspect the inventory for targets is much easier. Having the rolling downtime happen automatically is also a bit less error prone. Tests for things like response times will be placed in the tests directory, allowing for scripts to be written against different services to try different things (like adding resources while rolling downtime happens). There is no central orchestration for the two components currently, in order to keep things simple. Restarting containers and running the tests is therefore best accomplished in a pair of tmux sessions. Change-Id: I2d8e3484bbb1a71d2cd0c4124f824d49f76e5c2c
This commit is contained in:
Nolan Brubaker
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Bowling Ball - OpenStack-Ansible Rolling Downtime Simulator
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###########################################################
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:date: 2017-03-09
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:tags: rackspace, openstack, ansible
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:category: \*openstack, \*nix
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About
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-----
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This project aims to test for issues with rolling downtime on
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OpenStack-Ansible deployments. It's comprised of two main components:
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* The ``rolling_restart.py`` script
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* The ``tests`` directory
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The ``rolling_restart.py`` script will stop containers from a specified group
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in a rolling fashion - node 1 will stop, then start, then node 2, then
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node 3 and so on. This script runs from the *deployment host*.
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The ``tests`` directory contains scripts to generate traffic against the
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target services. These vary per service, but attempt to apply usage to a
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system that will be restarted by ``rolling_restart.py`` in order to
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measure the effects. These scripts run from a *utility container*.
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Usage
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-----
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#. Start your test script from the utility container. ``keystone.py``
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will request a session and a list of projects on an infinite loop, for
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example.
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#. From the deployment node, run ``rolling_restart.py`` in the playbooks
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directory (necessary to find the inventory script). Specify the service
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you're targeting with the ``-s`` parameter.
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``rolling_restart.py -s keystone_container``
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You can specify a wait time in seconds between stopping and starting
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individual nodes.
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``rolling_restart.py -s keystone_container -w 60``
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Assumptions
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-----------
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These tools are currently coupled to OSA, and they assume paths to files
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as specified by the ``multi-node-aio`` scripts.
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Container stopping and starting is done with an ansible command, and the
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physical host to target is derivced from the current inventory.
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``rolling_restart.py`` must currently be run from the ``playbooks``
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directory. This will be fixed later.
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You must source ``openrc`` before running ``keystone.py``.
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Why the name?
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-------------
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It sets 'em up and knocks em down.
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#!/usr/bin/env python
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# Copyright 2017, Rackspace US, Inc.
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#
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# 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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#
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# (c) 2017, Nolan Brubaker <nolan.brubaker@rackspace.com>
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import argparse
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import json
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import os
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import subprocess
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import sys
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import time
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CONF_DIR = os.path.join('/', 'etc', 'openstack_deploy')
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INVENTORY_FILE = os.path.join(CONF_DIR, 'openstack_inventory.json')
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CONF_FILE = os.path.join(CONF_DIR, 'openstack_user_config.yml')
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PLAYBOOK_DIR = os.path.join('/', 'opt', 'openstack_ansible', 'playbooks')
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STOP_TEMPLATE = 'ansible -i inventory -m shell -a\
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"lxc-stop -n {container}" {host}'
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START_TEMPLATE = 'ansible -i inventory -m shell -a\
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"lxc-start -dn {container}" {host}'
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def args(arg_list):
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parser = argparse.ArgumentParser(
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usage='%(prog)s',
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description='OpenStack-Ansible Rolling Update Simulator',
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epilog='Licensed "Apache 2.0"')
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parser.add_argument(
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'-s',
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'--service',
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help='Name of the service to rolling restart.',
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required=True,
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default=None,
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)
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parser.add_argument(
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'-w',
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'--wait',
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help=("Number of seconds to wait between stopping and starting. "
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"Default: 120"),
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default=120,
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)
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return vars(parser.parse_args(arg_list))
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def read_inventory(inventory_file):
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"""Parse inventory file into a python dictionary"""
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with open(inventory_file, 'r') as f:
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inventory = json.load(f)
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return inventory
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def get_similar_groups(target_group, inventory):
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"""
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Find group suggestions
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"""
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suggestions = []
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for key in inventory.keys():
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if target_group in key:
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suggestions.append(key)
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return suggestions
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def get_containers(target_group, inventory):
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"""Get container names in the relevant group"""
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group = inventory.get(target_group, None)
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if group is None:
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groups = get_similar_groups(target_group, inventory)
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print("No group {} found.".format(target_group))
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if groups:
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print("Maybe try one of these:")
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print("\n".join(groups))
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sys.exit(1)
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containers = group['hosts']
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containers.sort()
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return containers
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def rolling_restart(containers, inventory, wait=120):
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"""Restart containers in numerical order, one at a time.
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wait is the number of seconds to wait between stopping and starting a
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container
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"""
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for container in containers:
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host = inventory['_meta']['hostvars'][container]['physical_host']
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stop_cmd = STOP_TEMPLATE.format(container=container, host=host)
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print("Stopping {container}".format(container=container))
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subprocess.check_call(stop_cmd, shell=True)
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time.sleep(wait)
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start_cmd = START_TEMPLATE.format(container=container, host=host)
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subprocess.check_call(start_cmd, shell=True)
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print("Started {container}".format(container=container))
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def main():
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all_args = args(sys.argv[1:])
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service = all_args['service']
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wait = all_args['wait']
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inventory = read_inventory(INVENTORY_FILE)
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containers = get_containers(service, inventory)
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rolling_restart(containers, inventory, wait)
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if __name__ == "__main__":
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main()
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#!/usr/bin/env python
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# Copyright 2017, Rackspace US, Inc.
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#
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# 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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#
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# (c) 2017, Nolan Brubaker <nolan.brubaker@rackspace.com>
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import datetime
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from keystoneauth1.identity import v3
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from keystoneauth1 import session
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from keystoneauth1.exceptions.connection import ConnectFailure
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from keystoneauth1.exceptions.http import InternalServerError
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from keystoneclient.v3 import client
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import os
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import sys
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import time
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auth_url = os.environ['OS_AUTH_URL']
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password = os.environ['OS_PASSWORD']
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auth = v3.Password(auth_url=auth_url, username="admin",
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password=password, project_name="admin",
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user_domain_id="default", project_domain_id="default")
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disconnected = None
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try:
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while True:
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try:
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# Pause for a bit so we're not generating more data than we
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# can handle
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time.sleep(1)
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start_time = datetime.datetime.now()
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sess = session.Session(auth=auth)
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keystone = client.Client(session=sess)
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keystone.projects.list()
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end_time = datetime.datetime.now()
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if disconnected:
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dis_delta = end_time - disconnected
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disconnected = None
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print("Reconnect {}s".format(dis_delta.total_seconds()))
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delta = end_time - start_time
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print("New list: {]s.".format(delta.total_seconds()))
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except (ConnectFailure, InternalServerError):
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if not disconnected:
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disconnected = datetime.datetime.now()
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except KeyboardInterrupt:
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sys.exit()
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