Module for managing nodes in a Rackspace Cloud Load Balancer
This commit is contained in:
Lukasz Kawczynski
parent
d1effecb2e
commit
eb9e51fbb3
1 changed files with 350 additions and 0 deletions
350
library/cloud/rax_clb_nodes
Normal file
350
library/cloud/rax_clb_nodes
Normal file
|
|
@ -0,0 +1,350 @@
|
|||
#!/usr/bin/python
|
||||
# This file is part of Ansible
|
||||
#
|
||||
# Ansible is free software: you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation, either version 3 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# Ansible is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
DOCUMENTATION = '''
|
||||
---
|
||||
module: rax_clb_nodes
|
||||
short_description: add, modify and remove nodes from a Rackspace Cloud Load Balancer
|
||||
description:
|
||||
- Adds, modifies and removes nodes from a Rackspace Cloud Load Balancer
|
||||
version_added: "1.3"
|
||||
options:
|
||||
address:
|
||||
required: false
|
||||
description:
|
||||
- IP address or domain name of the node
|
||||
api_key:
|
||||
required: false
|
||||
description:
|
||||
- Rackspace API key (overrides C(credentials))
|
||||
condition:
|
||||
required: false
|
||||
choices: [ "enabled", "disabled", "draining" ]
|
||||
description:
|
||||
- Condition for the node, which determines its role within the load
|
||||
balancer
|
||||
credentials:
|
||||
required: false
|
||||
description:
|
||||
- File to find the Rackspace credentials in (ignored if C(api_key) and
|
||||
C(username) are provided)
|
||||
load_balancer_id:
|
||||
required: true
|
||||
type: integer
|
||||
description:
|
||||
- Load balancer id
|
||||
node_id:
|
||||
required: false
|
||||
type: integer
|
||||
description:
|
||||
- Node id
|
||||
port:
|
||||
required: false
|
||||
type: integer
|
||||
description:
|
||||
- Port number of the load balanced service on the node
|
||||
region:
|
||||
required: false
|
||||
description:
|
||||
- Region to authenticate in
|
||||
state:
|
||||
required: false
|
||||
default: "present"
|
||||
choices: [ "present", "absent" ]
|
||||
description:
|
||||
- Indicate desired state of the node
|
||||
type:
|
||||
required: false
|
||||
choices: [ "primary", "secondary" ]
|
||||
description:
|
||||
- Type of node
|
||||
username:
|
||||
required: false
|
||||
description:
|
||||
- Rackspace username (overrides C(credentials))
|
||||
virtualenv:
|
||||
required: false
|
||||
description:
|
||||
- Path to a virtualenv that should be activated before doing anything.
|
||||
The virtualenv has to already exist. Useful if installing pyrax
|
||||
globally is not an option.
|
||||
wait:
|
||||
required: false
|
||||
default: "no"
|
||||
choices: [ "yes", "no" ]
|
||||
description:
|
||||
- Wait for the load balancer to become active before returning
|
||||
wait_timeout:
|
||||
required: false
|
||||
type: integer
|
||||
default: 30
|
||||
description:
|
||||
- How long to wait before giving up and returning an error
|
||||
weight:
|
||||
required: false
|
||||
description:
|
||||
- Weight of node
|
||||
requirements: [ "pyrax" ]
|
||||
author: Lukasz Kawczynski
|
||||
notes:
|
||||
- The following environment variables can be used: C(RAX_USERNAME),
|
||||
C(RAX_API_KEY), C(RAX_CREDENTIALS) and C(RAX_REGION).
|
||||
'''
|
||||
|
||||
EXAMPLES = '''
|
||||
# Add a new node to the load balancer
|
||||
- local_action:
|
||||
module: rax_clb_nodes
|
||||
load_balancer_id: 71
|
||||
address: 10.2.2.3
|
||||
port: 80
|
||||
condition: enabled
|
||||
type: primary
|
||||
wait: yes
|
||||
credentials: /path/to/credentials
|
||||
|
||||
# Drain connections from a node
|
||||
- local_action:
|
||||
module: rax_clb_nodes
|
||||
load_balancer_id: 71
|
||||
node_id: 410
|
||||
condition: draining
|
||||
wait: yes
|
||||
credentials: /path/to/credentials
|
||||
|
||||
# Remove a node from the load balancer
|
||||
- local_action:
|
||||
module: rax_clb_nodes
|
||||
load_balancer_id: 71
|
||||
node_id: 410
|
||||
state: absent
|
||||
wait: yes
|
||||
credentials: /path/to/credentials
|
||||
'''
|
||||
|
||||
import os
|
||||
|
||||
|
||||
def _activate_virtualenv(path):
|
||||
path = os.path.expanduser(path)
|
||||
activate_this = os.path.join(path, 'bin', 'activate_this.py')
|
||||
execfile(activate_this, dict(__file__=activate_this))
|
||||
|
||||
|
||||
def _get_node(lb, node_id):
|
||||
"""Return a node with the given `node_id`"""
|
||||
for node in lb.nodes:
|
||||
if node.id == node_id:
|
||||
return node
|
||||
return None
|
||||
|
||||
|
||||
def _is_primary(node):
|
||||
"""Return True if node is primary and enabled"""
|
||||
return (node.type.lower() == 'primary' and
|
||||
node.condition.lower() == 'enabled')
|
||||
|
||||
|
||||
def _get_primary_nodes(lb):
|
||||
"""Return a list of primary and enabled nodes"""
|
||||
nodes = []
|
||||
for node in lb.nodes:
|
||||
if _is_primary(node):
|
||||
nodes.append(node)
|
||||
return nodes
|
||||
|
||||
|
||||
def _node_to_dict(node):
|
||||
"""Return a dictionary containing node details"""
|
||||
if not node:
|
||||
return {}
|
||||
return {
|
||||
'address': node.address,
|
||||
'condition': node.condition,
|
||||
'id': node.id,
|
||||
'port': node.port,
|
||||
'type': node.type,
|
||||
'weight': node.weight,
|
||||
}
|
||||
|
||||
|
||||
def main():
|
||||
module = AnsibleModule(
|
||||
argument_spec=dict(
|
||||
address=dict(),
|
||||
api_key=dict(),
|
||||
condition=dict(choices=['enabled', 'disabled', 'draining']),
|
||||
credentials=dict(),
|
||||
load_balancer_id=dict(required=True, type='int'),
|
||||
node_id=dict(type='int'),
|
||||
port=dict(type='int'),
|
||||
region=dict(),
|
||||
state=dict(default='present', choices=['present', 'absent']),
|
||||
type=dict(choices=['primary', 'secondary']),
|
||||
username=dict(),
|
||||
virtualenv=dict(),
|
||||
wait=dict(default=False, choices=BOOLEANS, type='bool'),
|
||||
wait_timeout=dict(default=30, type='int'),
|
||||
weight=dict(type='int'),
|
||||
),
|
||||
required_together=[
|
||||
['api_key', 'username']
|
||||
],
|
||||
)
|
||||
|
||||
address = module.params['address']
|
||||
api_key = module.params['api_key']
|
||||
condition = (module.params['condition'] and
|
||||
module.params['condition'].upper())
|
||||
credentials = module.params['credentials']
|
||||
load_balancer_id = module.params['load_balancer_id']
|
||||
node_id = module.params['node_id']
|
||||
port = module.params['port']
|
||||
region = module.params['region']
|
||||
state = module.params['state']
|
||||
typ = module.params['type'] and module.params['type'].upper()
|
||||
username = module.params['username']
|
||||
virtualenv = module.params['virtualenv']
|
||||
wait = module.params['wait']
|
||||
wait_timeout = module.params['wait_timeout'] or 1
|
||||
weight = module.params['weight']
|
||||
|
||||
if virtualenv:
|
||||
try:
|
||||
_activate_virtualenv(virtualenv)
|
||||
except IOError, e:
|
||||
module.fail_json(msg='Failed to activate virtualenv %s (%s)' % (
|
||||
virtualenv, e))
|
||||
|
||||
try:
|
||||
import pyrax
|
||||
except ImportError:
|
||||
module.fail_json(msg='pyrax is not installed')
|
||||
|
||||
username = username or os.environ.get('RAX_USERNAME')
|
||||
api_key = api_key or os.environ.get('RAX_API_KEY')
|
||||
credentials = credentials or os.environ.get('RAX_CREDENTIALS')
|
||||
region = region or os.environ.get('RAX_REGION')
|
||||
|
||||
pyrax.set_setting("identity_type", "rackspace")
|
||||
|
||||
try:
|
||||
if api_key and username:
|
||||
pyrax.set_credentials(username, api_key=api_key, region=region)
|
||||
elif credentials:
|
||||
credentials = os.path.expanduser(credentials)
|
||||
pyrax.set_credential_file(credentials, region=region)
|
||||
else:
|
||||
module.fail_json(msg='Credentials not set')
|
||||
except pyrax.exc.PyraxException, e:
|
||||
module.fail_json(msg='%s' % e.message)
|
||||
|
||||
if not pyrax.cloud_loadbalancers:
|
||||
module.fail_json(msg='Failed to instantiate load balancer client '
|
||||
'(possibly incorrect region)')
|
||||
|
||||
try:
|
||||
lb = pyrax.cloud_loadbalancers.get(load_balancer_id)
|
||||
except pyrax.exc.PyraxException, e:
|
||||
module.fail_json(msg='%s' % e.message)
|
||||
|
||||
if node_id:
|
||||
node = _get_node(lb, node_id)
|
||||
else:
|
||||
node = None
|
||||
|
||||
result = _node_to_dict(node)
|
||||
|
||||
if state == 'absent':
|
||||
if not node: # Removing a non-existent node
|
||||
module.exit_json(changed=False, state=state)
|
||||
|
||||
# The API detects this as well but currently pyrax does not return a
|
||||
# meaningful error message
|
||||
if _is_primary(node) and len(_get_primary_nodes(lb)) == 1:
|
||||
module.fail_json(
|
||||
msg='At least one primary node has to be enabled')
|
||||
|
||||
try:
|
||||
lb.delete_node(node)
|
||||
result = {}
|
||||
except pyrax.exc.NotFound:
|
||||
module.exit_json(changed=False, state=state)
|
||||
except pyrax.exc.PyraxException, e:
|
||||
module.fail_json(msg='%s' % e.message)
|
||||
else: # present
|
||||
if not node:
|
||||
if node_id: # Updating a non-existent node
|
||||
msg = 'Node %d not found' % node_id
|
||||
if lb.nodes:
|
||||
msg += (' (available nodes: %s)' %
|
||||
', '.join([str(x.id) for x in lb.nodes]))
|
||||
module.fail_json(msg=msg)
|
||||
else: # Creating a new node
|
||||
try:
|
||||
node = pyrax.cloudloadbalancers.Node(
|
||||
address=address, port=port, condition=condition,
|
||||
weight=weight, type=typ)
|
||||
resp, body = lb.add_nodes([node])
|
||||
result.update(body['nodes'][0])
|
||||
except pyrax.exc.PyraxException, e:
|
||||
module.fail_json(msg='%s' % e.message)
|
||||
else: # Updating an existing node
|
||||
immutable = {
|
||||
'address': address,
|
||||
'port': port,
|
||||
}
|
||||
|
||||
mutable = {
|
||||
'condition': condition,
|
||||
'type': typ,
|
||||
'weight': weight,
|
||||
}
|
||||
|
||||
for name, value in immutable.items():
|
||||
if value:
|
||||
module.fail_json(
|
||||
msg='Attribute %s cannot be modified' % name)
|
||||
|
||||
for name, value in mutable.items():
|
||||
if value is None or value == getattr(node, name):
|
||||
mutable.pop(name)
|
||||
|
||||
if not mutable:
|
||||
module.exit_json(changed=False, state=state, node=result)
|
||||
|
||||
try:
|
||||
# The diff has to be set explicitly to update node's weight and
|
||||
# type; this should probably be fixed in pyrax
|
||||
lb.update_node(node, diff=mutable)
|
||||
result.update(mutable)
|
||||
except pyrax.exc.PyraxException, e:
|
||||
module.fail_json(msg='%s' % e.message)
|
||||
|
||||
if wait:
|
||||
pyrax.utils.wait_until(lb, "status", "ACTIVE", interval=1,
|
||||
attempts=wait_timeout)
|
||||
if lb.status != 'ACTIVE':
|
||||
module.fail_json(
|
||||
msg='Load balancer not active after %ds (current status: %s)' %
|
||||
(wait_timeout, lb.status.lower()))
|
||||
|
||||
kwargs = {'node': result} if result else {}
|
||||
module.exit_json(changed=True, state=state, **kwargs)
|
||||
|
||||
# this is magic, see lib/ansible/module_common.py
|
||||
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
|
||||
main()
|
||||
Loading…
Reference in a new issue