mirror of https://github.com/ansible/ansible.git
Module for managing nodes in a Rackspace Cloud Load Balancer
Lukasz Kawczynski
12 years ago
parent
2da5dc7886
commit
27cc519748
@ -0,0 +1,350 @@
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#!/usr/bin/python
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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DOCUMENTATION = '''
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---
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module: rax_clb_nodes
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short_description: add, modify and remove nodes from a Rackspace Cloud Load Balancer
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description:
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- Adds, modifies and removes nodes from a Rackspace Cloud Load Balancer
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version_added: "1.3"
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options:
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address:
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required: false
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description:
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- IP address or domain name of the node
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api_key:
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required: false
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description:
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- Rackspace API key (overrides C(credentials))
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condition:
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required: false
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choices: [ "enabled", "disabled", "draining" ]
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description:
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- Condition for the node, which determines its role within the load
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balancer
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credentials:
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required: false
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description:
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- File to find the Rackspace credentials in (ignored if C(api_key) and
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C(username) are provided)
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load_balancer_id:
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required: true
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type: integer
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description:
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- Load balancer id
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node_id:
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required: false
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type: integer
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description:
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- Node id
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port:
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required: false
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type: integer
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description:
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- Port number of the load balanced service on the node
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region:
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required: false
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description:
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- Region to authenticate in
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state:
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required: false
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default: "present"
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choices: [ "present", "absent" ]
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description:
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- Indicate desired state of the node
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type:
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required: false
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choices: [ "primary", "secondary" ]
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description:
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- Type of node
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username:
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required: false
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description:
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- Rackspace username (overrides C(credentials))
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virtualenv:
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required: false
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description:
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- Path to a virtualenv that should be activated before doing anything.
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The virtualenv has to already exist. Useful if installing pyrax
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globally is not an option.
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wait:
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required: false
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default: "no"
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choices: [ "yes", "no" ]
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description:
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- Wait for the load balancer to become active before returning
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wait_timeout:
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required: false
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type: integer
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default: 30
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description:
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- How long to wait before giving up and returning an error
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weight:
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required: false
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description:
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- Weight of node
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requirements: [ "pyrax" ]
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author: Lukasz Kawczynski
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notes:
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- The following environment variables can be used: C(RAX_USERNAME),
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C(RAX_API_KEY), C(RAX_CREDENTIALS) and C(RAX_REGION).
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'''
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EXAMPLES = '''
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# Add a new node to the load balancer
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- local_action:
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module: rax_clb_nodes
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load_balancer_id: 71
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address: 10.2.2.3
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port: 80
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condition: enabled
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type: primary
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wait: yes
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credentials: /path/to/credentials
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# Drain connections from a node
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- local_action:
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module: rax_clb_nodes
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load_balancer_id: 71
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node_id: 410
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condition: draining
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wait: yes
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credentials: /path/to/credentials
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# Remove a node from the load balancer
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- local_action:
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module: rax_clb_nodes
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load_balancer_id: 71
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node_id: 410
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state: absent
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wait: yes
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credentials: /path/to/credentials
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'''
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import os
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def _activate_virtualenv(path):
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path = os.path.expanduser(path)
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activate_this = os.path.join(path, 'bin', 'activate_this.py')
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execfile(activate_this, dict(__file__=activate_this))
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def _get_node(lb, node_id):
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"""Return a node with the given `node_id`"""
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for node in lb.nodes:
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if node.id == node_id:
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return node
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return None
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def _is_primary(node):
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"""Return True if node is primary and enabled"""
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return (node.type.lower() == 'primary' and
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node.condition.lower() == 'enabled')
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def _get_primary_nodes(lb):
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"""Return a list of primary and enabled nodes"""
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nodes = []
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for node in lb.nodes:
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if _is_primary(node):
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nodes.append(node)
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return nodes
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def _node_to_dict(node):
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"""Return a dictionary containing node details"""
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if not node:
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return {}
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return {
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'address': node.address,
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'condition': node.condition,
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'id': node.id,
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'port': node.port,
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'type': node.type,
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'weight': node.weight,
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}
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def main():
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module = AnsibleModule(
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argument_spec=dict(
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address=dict(),
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api_key=dict(),
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condition=dict(choices=['enabled', 'disabled', 'draining']),
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credentials=dict(),
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load_balancer_id=dict(required=True, type='int'),
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node_id=dict(type='int'),
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port=dict(type='int'),
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region=dict(),
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state=dict(default='present', choices=['present', 'absent']),
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type=dict(choices=['primary', 'secondary']),
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username=dict(),
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virtualenv=dict(),
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wait=dict(default=False, choices=BOOLEANS, type='bool'),
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wait_timeout=dict(default=30, type='int'),
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weight=dict(type='int'),
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),
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required_together=[
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['api_key', 'username']
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],
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)
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address = module.params['address']
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api_key = module.params['api_key']
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condition = (module.params['condition'] and
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module.params['condition'].upper())
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credentials = module.params['credentials']
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load_balancer_id = module.params['load_balancer_id']
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node_id = module.params['node_id']
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port = module.params['port']
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region = module.params['region']
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state = module.params['state']
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typ = module.params['type'] and module.params['type'].upper()
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username = module.params['username']
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virtualenv = module.params['virtualenv']
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wait = module.params['wait']
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wait_timeout = module.params['wait_timeout'] or 1
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weight = module.params['weight']
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if virtualenv:
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try:
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_activate_virtualenv(virtualenv)
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except IOError, e:
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module.fail_json(msg='Failed to activate virtualenv %s (%s)' % (
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virtualenv, e))
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try:
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import pyrax
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except ImportError:
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module.fail_json(msg='pyrax is not installed')
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username = username or os.environ.get('RAX_USERNAME')
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api_key = api_key or os.environ.get('RAX_API_KEY')
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credentials = credentials or os.environ.get('RAX_CREDENTIALS')
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region = region or os.environ.get('RAX_REGION')
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pyrax.set_setting("identity_type", "rackspace")
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try:
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if api_key and username:
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pyrax.set_credentials(username, api_key=api_key, region=region)
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elif credentials:
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credentials = os.path.expanduser(credentials)
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pyrax.set_credential_file(credentials, region=region)
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else:
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module.fail_json(msg='Credentials not set')
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except pyrax.exc.PyraxException, e:
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module.fail_json(msg='%s' % e.message)
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if not pyrax.cloud_loadbalancers:
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module.fail_json(msg='Failed to instantiate load balancer client '
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'(possibly incorrect region)')
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try:
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lb = pyrax.cloud_loadbalancers.get(load_balancer_id)
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except pyrax.exc.PyraxException, e:
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module.fail_json(msg='%s' % e.message)
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if node_id:
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node = _get_node(lb, node_id)
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else:
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node = None
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result = _node_to_dict(node)
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if state == 'absent':
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if not node: # Removing a non-existent node
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module.exit_json(changed=False, state=state)
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# The API detects this as well but currently pyrax does not return a
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# meaningful error message
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if _is_primary(node) and len(_get_primary_nodes(lb)) == 1:
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module.fail_json(
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msg='At least one primary node has to be enabled')
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try:
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lb.delete_node(node)
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result = {}
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except pyrax.exc.NotFound:
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module.exit_json(changed=False, state=state)
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except pyrax.exc.PyraxException, e:
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module.fail_json(msg='%s' % e.message)
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else: # present
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if not node:
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if node_id: # Updating a non-existent node
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msg = 'Node %d not found' % node_id
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if lb.nodes:
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msg += (' (available nodes: %s)' %
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', '.join([str(x.id) for x in lb.nodes]))
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module.fail_json(msg=msg)
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else: # Creating a new node
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try:
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node = pyrax.cloudloadbalancers.Node(
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address=address, port=port, condition=condition,
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weight=weight, type=typ)
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resp, body = lb.add_nodes([node])
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result.update(body['nodes'][0])
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except pyrax.exc.PyraxException, e:
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module.fail_json(msg='%s' % e.message)
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else: # Updating an existing node
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immutable = {
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'address': address,
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'port': port,
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}
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mutable = {
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'condition': condition,
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'type': typ,
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'weight': weight,
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}
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for name, value in immutable.items():
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if value:
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module.fail_json(
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msg='Attribute %s cannot be modified' % name)
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for name, value in mutable.items():
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if value is None or value == getattr(node, name):
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mutable.pop(name)
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if not mutable:
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module.exit_json(changed=False, state=state, node=result)
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try:
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# The diff has to be set explicitly to update node's weight and
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# type; this should probably be fixed in pyrax
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lb.update_node(node, diff=mutable)
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result.update(mutable)
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except pyrax.exc.PyraxException, e:
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module.fail_json(msg='%s' % e.message)
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if wait:
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pyrax.utils.wait_until(lb, "status", "ACTIVE", interval=1,
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attempts=wait_timeout)
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if lb.status != 'ACTIVE':
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module.fail_json(
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msg='Load balancer not active after %ds (current status: %s)' %
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(wait_timeout, lb.status.lower()))
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kwargs = {'node': result} if result else {}
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module.exit_json(changed=True, state=state, **kwargs)
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# this is magic, see lib/ansible/module_common.py
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#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
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main()
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