mirror of
https://github.com/ansible-collections/community.general.git
synced 2024-09-14 20:13:21 +02:00
e7b275483c
Uses the new get_aws_connection_info and connect_to_aws common methods to reuse code Now complains if region is not set in one of the three possible methods Also moved over to common documentation code so this is actually based on #6913
337 lines
12 KiB
Python
337 lines
12 KiB
Python
#!/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: ec2_elb
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short_description: De-registers or registers instances from EC2 ELBs
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description:
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- This module de-registers or registers an AWS EC2 instance from the ELBs
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that it belongs to.
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- Returns fact "ec2_elbs" which is a list of elbs attached to the instance
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if state=absent is passed as an argument.
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- Will be marked changed when called only if there are ELBs found to operate on.
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version_added: "1.2"
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author: John Jarvis
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options:
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state:
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description:
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- register or deregister the instance
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required: true
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choices: ['present', 'absent']
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instance_id:
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description:
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- EC2 Instance ID
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required: true
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ec2_elbs:
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description:
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- List of ELB names, required for registration. The ec2_elbs fact should be used if there was a previous de-register.
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required: false
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default: None
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region:
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description:
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- The AWS region to use. If not specified then the value of the EC2_REGION environment variable, if any, is used.
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required: false
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aliases: ['aws_region', 'ec2_region']
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enable_availability_zone:
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description:
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- Whether to enable the availability zone of the instance on the target ELB if the availability zone has not already
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been enabled. If set to no, the task will fail if the availability zone is not enabled on the ELB.
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required: false
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default: yes
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choices: [ "yes", "no" ]
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wait:
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description:
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- Wait for instance registration or deregistration to complete successfully before returning.
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required: false
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default: yes
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choices: [ "yes", "no" ]
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validate_certs:
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description:
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- When set to "no", SSL certificates will not be validated for boto versions >= 2.6.0.
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required: false
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default: "yes"
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choices: ["yes", "no"]
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aliases: []
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version_added: "1.5"
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wait_timeout:
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description:
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- Number of seconds to wait for an instance to change state. If 0 then this module may return an error if a transient error occurs. If non-zero then any transient errors are ignored until the timeout is reached. Ignored when wait=no.
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required: false
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default: 0
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version_added: "1.6"
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extends_documentation_fragment: aws
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"""
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EXAMPLES = """
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# basic pre_task and post_task example
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pre_tasks:
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- name: Gathering ec2 facts
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ec2_facts:
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- name: Instance De-register
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local_action: ec2_elb
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args:
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instance_id: "{{ ansible_ec2_instance_id }}"
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state: 'absent'
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roles:
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- myrole
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post_tasks:
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- name: Instance Register
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local_action: ec2_elb
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args:
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instance_id: "{{ ansible_ec2_instance_id }}"
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ec2_elbs: "{{ item }}"
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state: 'present'
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with_items: ec2_elbs
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"""
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import time
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import sys
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import os
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try:
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import boto
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import boto.ec2
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import boto.ec2.elb
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from boto.regioninfo import RegionInfo
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except ImportError:
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print "failed=True msg='boto required for this module'"
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sys.exit(1)
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class ElbManager:
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"""Handles EC2 instance ELB registration and de-registration"""
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def __init__(self, module, instance_id=None, ec2_elbs=None,
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region=None, **aws_connect_params):
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self.module = module
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self.instance_id = instance_id
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self.region = region
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self.aws_connect_params = aws_connect_params
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self.lbs = self._get_instance_lbs(ec2_elbs)
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self.changed = False
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def deregister(self, wait, timeout):
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"""De-register the instance from all ELBs and wait for the ELB
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to report it out-of-service"""
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for lb in self.lbs:
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initial_state = self._get_instance_health(lb) if wait else None
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if initial_state and initial_state.state == 'InService':
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lb.deregister_instances([self.instance_id])
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else:
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return
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if wait:
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self._await_elb_instance_state(lb, 'OutOfService', initial_state, timeout)
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else:
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# We cannot assume no change was made if we don't wait
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# to find out
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self.changed = True
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def register(self, wait, enable_availability_zone, timeout):
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"""Register the instance for all ELBs and wait for the ELB
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to report the instance in-service"""
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for lb in self.lbs:
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initial_state = self._get_instance_health(lb)
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if enable_availability_zone:
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self._enable_availailability_zone(lb)
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lb.register_instances([self.instance_id])
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if wait:
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self._await_elb_instance_state(lb, 'InService', initial_state, timeout)
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else:
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# We cannot assume no change was made if we don't wait
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# to find out
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self.changed = True
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def exists(self, lbtest):
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""" Verify that the named ELB actually exists """
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found = False
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for lb in self.lbs:
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if lb.name == lbtest:
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found=True
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break
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return found
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def _enable_availailability_zone(self, lb):
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"""Enable the current instance's availability zone in the provided lb.
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Returns True if the zone was enabled or False if no change was made.
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lb: load balancer"""
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instance = self._get_instance()
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if instance.placement in lb.availability_zones:
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return False
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lb.enable_zones(zones=instance.placement)
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# If successful, the new zone will have been added to
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# lb.availability_zones
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return instance.placement in lb.availability_zones
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def _await_elb_instance_state(self, lb, awaited_state, initial_state, timeout):
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"""Wait for an ELB to change state
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lb: load balancer
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awaited_state : state to poll for (string)"""
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wait_timeout = time.time() + timeout
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while True:
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instance_state = self._get_instance_health(lb)
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if not instance_state:
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msg = ("The instance %s could not be put in service on %s."
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" Reason: Invalid Instance")
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self.module.fail_json(msg=msg % (self.instance_id, lb))
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if instance_state.state == awaited_state:
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# Check the current state agains the initial state, and only set
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# changed if they are different.
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if (initial_state is None) or (instance_state.state != initial_state.state):
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self.changed = True
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break
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elif self._is_instance_state_pending(instance_state):
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# If it's pending, we'll skip further checks andd continue waiting
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pass
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elif (awaited_state == 'InService'
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and instance_state.reason_code == "Instance"
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and time.time() >= wait_timeout):
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# If the reason_code for the instance being out of service is
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# "Instance" this indicates a failure state, e.g. the instance
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# has failed a health check or the ELB does not have the
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# instance's availabilty zone enabled. The exact reason why is
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# described in InstantState.description.
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msg = ("The instance %s could not be put in service on %s."
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" Reason: %s")
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self.module.fail_json(msg=msg % (self.instance_id,
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lb,
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instance_state.description))
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time.sleep(1)
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def _is_instance_state_pending(self, instance_state):
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"""
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Determines whether the instance_state is "pending", meaning there is
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an operation under way to bring it in service.
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"""
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# This is messy, because AWS provides no way to distinguish between
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# an instance that is is OutOfService because it's pending vs. OutOfService
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# because it's failing health checks. So we're forced to analyze the
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# description, which is likely to be brittle.
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return (instance_state and 'pending' in instance_state.description)
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def _get_instance_health(self, lb):
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"""
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Check instance health, should return status object or None under
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certain error conditions.
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"""
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try:
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status = lb.get_instance_health([self.instance_id])[0]
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except boto.exception.BotoServerError, e:
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if e.error_code == 'InvalidInstance':
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return None
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else:
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raise
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return status
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def _get_instance_lbs(self, ec2_elbs=None):
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"""Returns a list of ELBs attached to self.instance_id
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ec2_elbs: an optional list of elb names that will be used
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for elb lookup instead of returning what elbs
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are attached to self.instance_id"""
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try:
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elb = connect_to_aws(boto.ec2.elb, self.region,
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**self.aws_connect_params)
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except boto.exception.NoAuthHandlerFound, e:
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self.module.fail_json(msg=str(e))
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elbs = elb.get_all_load_balancers()
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if ec2_elbs:
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lbs = sorted(lb for lb in elbs if lb.name in ec2_elbs)
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else:
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lbs = []
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for lb in elbs:
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for info in lb.instances:
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if self.instance_id == info.id:
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lbs.append(lb)
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return lbs
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def _get_instance(self):
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"""Returns a boto.ec2.InstanceObject for self.instance_id"""
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try:
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ec2 = connect_to_aws(boto.ec2, self.region,
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**self.aws_connect_params)
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except boto.exception.NoAuthHandlerFound, e:
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self.module.fail_json(msg=str(e))
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return ec2.get_only_instances(instance_ids=[self.instance_id])[0]
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def main():
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argument_spec = ec2_argument_spec()
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argument_spec.update(dict(
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state={'required': True},
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instance_id={'required': True},
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ec2_elbs={'default': None, 'required': False, 'type':'list'},
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enable_availability_zone={'default': True, 'required': False, 'type': 'bool'},
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wait={'required': False, 'default': True, 'type': 'bool'},
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wait_timeout={'requred': False, 'default': 0, 'type': 'int'}
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)
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)
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module = AnsibleModule(
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argument_spec=argument_spec,
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)
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region, ec2_url, aws_connect_params = get_aws_connection_info(module)
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if not region:
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module.fail_json(msg="Region must be specified as a parameter, in EC2_REGION or AWS_REGION environment variables or in boto configuration file")
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ec2_elbs = module.params['ec2_elbs']
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wait = module.params['wait']
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enable_availability_zone = module.params['enable_availability_zone']
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timeout = module.params['wait_timeout']
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if module.params['state'] == 'present' and 'ec2_elbs' not in module.params:
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module.fail_json(msg="ELBs are required for registration")
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instance_id = module.params['instance_id']
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elb_man = ElbManager(module, instance_id, ec2_elbs,
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region=region, **aws_connect_params)
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if ec2_elbs is not None:
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for elb in ec2_elbs:
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if not elb_man.exists(elb):
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msg="ELB %s does not exist" % elb
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module.fail_json(msg=msg)
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if module.params['state'] == 'present':
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elb_man.register(wait, enable_availability_zone, timeout)
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elif module.params['state'] == 'absent':
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elb_man.deregister(wait, timeout)
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ansible_facts = {'ec2_elbs': [lb.name for lb in elb_man.lbs]}
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ec2_facts_result = dict(changed=elb_man.changed, ansible_facts=ansible_facts)
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module.exit_json(**ec2_facts_result)
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# import module snippets
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from ansible.module_utils.basic import *
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from ansible.module_utils.ec2 import *
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main()
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