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#!/usr/bin/env python
# vim: expandtab:tabstop=4:shiftwidth=4
import argparse
import ConfigParser
import sys
import os
class Cluster(object):
"""
Control and Configuration Interface for OpenShift Clusters
"""
def __init__(self):
# setup ansible ssh environment
if 'ANSIBLE_SSH_ARGS' not in os.environ:
os.environ['ANSIBLE_SSH_ARGS'] = (
'-o ForwardAgent=yes '
'-o StrictHostKeyChecking=no '
'-o UserKnownHostsFile=/dev/null '
'-o ControlMaster=auto '
'-o ControlPersist=600s '
)
def create(self, args):
"""
Create an OpenShift cluster for given provider
:param args: command line arguments provided by user
:return: exit status from run command
"""
env = {'cluster_id': args.cluster_id}
playbook = "playbooks/{}/openshift-cluster/launch.yml".format(args.provider)
inventory = self.setup_provider(args.provider)
env['num_masters'] = args.masters
env['num_nodes'] = args.nodes
return self.action(args, inventory, env, playbook)
def terminate(self, args):
"""
Destroy OpenShift cluster
:param args: command line arguments provided by user
:return: exit status from run command
"""
env = {'cluster_id': args.cluster_id}
playbook = "playbooks/{}/openshift-cluster/terminate.yml".format(args.provider)
inventory = self.setup_provider(args.provider)
return self.action(args, inventory, env, playbook)
def list(self, args):
"""
List VMs in cluster
:param args: command line arguments provided by user
:return: exit status from run command
"""
env = {'cluster_id': args.cluster_id}
playbook = "playbooks/{}/openshift-cluster/list.yml".format(args.provider)
inventory = self.setup_provider(args.provider)
return self.action(args, inventory, env, playbook)
def update(self, args):
"""
Update to latest OpenShift across clustered VMs
:param args: command line arguments provided by user
:return: exit status from run command
"""
env = {'cluster_id': args.cluster_id}
playbook = "playbooks/{}/openshift-cluster/update.yml".format(args.provider)
inventory = self.setup_provider(args.provider)
return self.action(args, inventory, env, playbook)
def setup_provider(self, provider):
"""
Setup ansible playbook environment
:param provider: command line arguments provided by user
:return: path to inventory for given provider
"""
config = ConfigParser.ConfigParser()
if 'gce' == provider:
config.readfp(open('inventory/gce/gce.ini'))
for key in config.options('gce'):
os.environ[key] = config.get('gce', key)
inventory = '-i inventory/gce/gce.py'
elif 'aws' == provider:
config.readfp(open('inventory/aws/ec2.ini'))
for key in config.options('ec2'):
os.environ[key] = config.get('ec2', key)
inventory = '-i inventory/aws/ec2.py'
else:
# this code should never be reached
raise ValueError("invalid PROVIDER {}".format(provider))
return inventory
def action(self, args, inventory, env, playbook):
"""
Build ansible-playbook command line and execute
:param args: command line arguments provided by user
:param inventory: derived provider library
:param env: environment variables for kubernetes
:param playbook: ansible playbook to execute
:return: exit status from ansible-playbook command
"""
verbose = ''
if args.verbose > 0:
verbose = '-{}'.format('v' * args.verbose)
ansible_env = '-e \'{}\''.format(
' '.join(['%s=%s' % (key, value) for (key, value) in env.items()])
)
command = 'ansible-playbook {} {} {} {}'.format(
verbose, inventory, ansible_env, playbook
)
if args.verbose > 1:
command = 'time {}'.format(command)
if args.verbose > 0:
sys.stderr.write('RUN [{}]\n'.format(command))
sys.stderr.flush()
return os.system(command)
if __name__ == '__main__':
"""
Implemented to support writing unit tests
"""
cluster = Cluster()
providers = ['gce', 'aws']
parser = argparse.ArgumentParser(
description='Python wrapper to ensure proper environment for OpenShift ansible playbooks',
)
parser.add_argument('-v', '--verbose', action='count', help='Multiple -v options increase the verbosity')
parser.add_argument('--version', action='version', version='%(prog)s 0.2')
meta_parser = argparse.ArgumentParser(add_help=False)
meta_parser.add_argument('provider', choices=providers, help='provider')
meta_parser.add_argument('cluster_id', help='prefix for cluster VM names')
action_parser = parser.add_subparsers(dest='action', title='actions', description='Choose from valid actions')
create_parser = action_parser.add_parser('create', help='Create a cluster', parents=[meta_parser])
create_parser.add_argument('-m', '--masters', default=1, type=int, help='number of masters to create in cluster')
create_parser.add_argument('-n', '--nodes', default=2, type=int, help='number of nodes to create in cluster')
create_parser.set_defaults(func=cluster.create)
terminate_parser = action_parser.add_parser('terminate', help='Destroy a cluster', parents=[meta_parser])
terminate_parser.add_argument('-f', '--force', action='store_true', help='Destroy cluster without confirmation')
terminate_parser.set_defaults(func=cluster.terminate)
update_parser = action_parser.add_parser('update', help='Update OpenShift across cluster', parents=[meta_parser])
update_parser.add_argument('-f', '--force', action='store_true', help='Update cluster without confirmation')
update_parser.set_defaults(func=cluster.update)
list_parser = action_parser.add_parser('list', help='List VMs in cluster', parents=[meta_parser])
list_parser.set_defaults(func=cluster.list)
args = parser.parse_args()
if 'terminate' == args.action and not args.force:
answer = raw_input("This will destroy the ENTIRE {} environment. Are you sure? [y/N] ".format(args.cluster_id))
if answer not in ['y', 'Y']:
sys.stderr.write('\nACTION [terminate] aborted by user!\n')
exit(1)
if 'update' == args.action and not args.force:
answer = raw_input("This is destructive and could corrupt {} environment. Continue? [y/N] ".format(args.cluster_id))
if answer not in ['y', 'Y']:
sys.stderr.write('\nACTION [update] aborted by user!\n')
exit(1)
status = args.func(args)
if status != 0:
sys.stderr.write("ACTION [{}] failed with exit status {}\n".format(args.action, status))
exit(status)
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