698 lines
26 KiB
Python
698 lines
26 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_lb
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description: Creates or destroys Amazon ELB.
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short_description: Creates or destroys Amazon ELB.
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- Returns information about the load balancer.
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- Will be marked changed when called only if state is changed.
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version_added: "1.5"
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author: Jim Dalton
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options:
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state:
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description:
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- Create or destroy the ELB
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required: true
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name:
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description:
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- The name of the ELB
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required: true
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listeners:
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description:
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- List of ports/protocols for this ELB to listen on (see example)
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required: false
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purge_listeners:
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description:
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- Purge existing listeners on ELB that are not found in listeners
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required: false
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default: true
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zones:
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description:
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- List of availability zones to enable on this ELB
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required: false
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purge_zones:
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description:
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- Purge existing availability zones on ELB that are not found in zones
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required: false
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default: false
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security_group_ids:
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description:
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- A list of security groups to apply to the elb
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require: false
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default: None
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version_added: "1.6"
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health_check:
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description:
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- An associative array of health check configuration settigs (see example)
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require: 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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subnets:
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description:
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- A list of VPC subnets to use when creating ELB. Zones should be empty if using this.
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required: false
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default: None
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aliases: []
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version_added: "1.7"
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purge_subnets:
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description:
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- Purge existing subnet on ELB that are not found in subnets
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required: false
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default: false
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version_added: "1.7"
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scheme:
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description:
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- The scheme to use when creating the ELB. For a private VPC-visible ELB use 'internal'.
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required: false
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default: 'internet-facing'
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version_added: "1.7"
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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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connection_draining_timeout:
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description:
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- Wait a specified timeout allowing connections to drain before terminating an instance
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required: false
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aliases: []
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version_added: "1.8"
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cross_az_load_balancing:
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description:
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- Distribute load across all configured Availablity Zones
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required: false
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default: "no"
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choices: ["yes", "no"]
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aliases: []
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version_added: "1.8"
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extends_documentation_fragment: aws
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"""
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EXAMPLES = """
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# Note: None of these examples set aws_access_key, aws_secret_key, or region.
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# It is assumed that their matching environment variables are set.
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# Basic provisioning example
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- local_action:
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module: ec2_elb_lb
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name: "test-please-delete"
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state: present
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zones:
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- us-east-1a
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- us-east-1d
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listeners:
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- protocol: http # options are http, https, ssl, tcp
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load_balancer_port: 80
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instance_port: 80
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- protocol: https
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load_balancer_port: 443
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instance_protocol: http # optional, defaults to value of protocol setting
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instance_port: 80
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# ssl certificate required for https or ssl
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ssl_certificate_id: "arn:aws:iam::123456789012:server-certificate/company/servercerts/ProdServerCert"
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# Basic VPC provisioning example
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- local_action:
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module: ec2_elb_lb
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name: "test-vpc"
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scheme: internal
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state: present
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subnets:
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- subnet-abcd1234
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- subnet-1a2b3c4d
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listeners:
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- protocol: http # options are http, https, ssl, tcp
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load_balancer_port: 80
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instance_port: 80
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# Configure a health check
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- local_action:
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module: ec2_elb_lb
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name: "test-please-delete"
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state: present
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zones:
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- us-east-1d
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listeners:
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- protocol: http
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load_balancer_port: 80
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instance_port: 80
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health_check:
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ping_protocol: http # options are http, https, ssl, tcp
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ping_port: 80
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ping_path: "/index.html" # not required for tcp or ssl
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response_timeout: 5 # seconds
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interval: 30 # seconds
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unhealthy_threshold: 2
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healthy_threshold: 10
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# Ensure ELB is gone
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- local_action:
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module: ec2_elb_lb
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name: "test-please-delete"
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state: absent
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# Normally, this module will purge any listeners that exist on the ELB
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# but aren't specified in the listeners parameter. If purge_listeners is
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# false it leaves them alone
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- local_action:
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module: ec2_elb_lb
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name: "test-please-delete"
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state: present
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zones:
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- us-east-1a
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- us-east-1d
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listeners:
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- protocol: http
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load_balancer_port: 80
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instance_port: 80
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purge_listeners: no
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# Normally, this module will leave availability zones that are enabled
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# on the ELB alone. If purge_zones is true, then any extreneous zones
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# will be removed
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- local_action:
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module: ec2_elb_lb
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name: "test-please-delete"
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state: present
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zones:
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- us-east-1a
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- us-east-1d
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listeners:
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- protocol: http
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load_balancer_port: 80
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instance_port: 80
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purge_zones: yes
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# Creates a ELB and assigns a list of subnets to it.
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- local_action:
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module: ec2_elb_lb
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state: present
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name: 'New ELB'
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security_group_ids: 'sg-123456, sg-67890'
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region: us-west-2
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subnets: 'subnet-123456, subnet-67890'
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purge_subnets: yes
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listeners:
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- protocol: http
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load_balancer_port: 80
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instance_port: 80
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# Create an ELB with connection draining and cross availability
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# zone load balancing
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- local_action:
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module: ec2_elb_lb
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name: "New ELB"
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state: present
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connection_draining_timeout: 60
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cross_az_load_balancing: "yes"
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region: us-east-1
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zones:
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- us-east-1a
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- us-east-1d
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listeners:
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- protocols: http
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- load_balancer_port: 80
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- instance_port: 80
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"""
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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.elb
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import boto.ec2.elb.attributes
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from boto.ec2.elb.healthcheck import HealthCheck
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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(object):
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"""Handles ELB creation and destruction"""
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def __init__(self, module, name, listeners=None, purge_listeners=None,
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zones=None, purge_zones=None, security_group_ids=None,
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health_check=None, subnets=None, purge_subnets=None,
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scheme="internet-facing", connection_draining_timeout=None,
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cross_az_load_balancing=None, region=None, **aws_connect_params):
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self.module = module
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self.name = name
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self.listeners = listeners
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self.purge_listeners = purge_listeners
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self.zones = zones
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self.purge_zones = purge_zones
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self.security_group_ids = security_group_ids
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self.health_check = health_check
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self.subnets = subnets
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self.purge_subnets = purge_subnets
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self.scheme = scheme
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self.connection_draining_timeout = connection_draining_timeout
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self.cross_az_load_balancing = cross_az_load_balancing
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self.aws_connect_params = aws_connect_params
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self.region = region
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self.changed = False
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self.status = 'gone'
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self.elb_conn = self._get_elb_connection()
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self.elb = self._get_elb()
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def ensure_ok(self):
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"""Create the ELB"""
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if not self.elb:
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# Zones and listeners will be added at creation
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self._create_elb()
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else:
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self._set_zones()
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self._set_security_groups()
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self._set_elb_listeners()
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self._set_subnets()
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self._set_health_check()
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# boto has introduced support for some ELB attributes in
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# different versions, so we check first before trying to
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# set them to avoid errors
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if self._check_attribute_support('connection_draining'):
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self._set_connection_draining_timeout()
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if self._check_attribute_support('cross_zone_load_balancing'):
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self._set_cross_az_load_balancing()
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def ensure_gone(self):
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"""Destroy the ELB"""
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if self.elb:
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self._delete_elb()
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def get_info(self):
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try:
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check_elb = self.elb_conn.get_all_load_balancers(self.name)[0]
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except:
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check_elb = None
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if not check_elb:
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info = {
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'name': self.name,
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'status': self.status
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}
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else:
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info = {
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'name': check_elb.name,
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'dns_name': check_elb.dns_name,
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'zones': check_elb.availability_zones,
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'security_group_ids': check_elb.security_groups,
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'status': self.status,
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'subnets': self.subnets,
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'scheme': check_elb.scheme
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}
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if check_elb.health_check:
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info['health_check'] = {
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'target': check_elb.health_check.target,
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'interval': check_elb.health_check.interval,
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'timeout': check_elb.health_check.timeout,
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'healthy_threshold': check_elb.health_check.healthy_threshold,
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'unhealthy_threshold': check_elb.health_check.unhealthy_threshold,
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}
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if check_elb.listeners:
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info['listeners'] = [l.get_complex_tuple()
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for l in check_elb.listeners]
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elif self.status == 'created':
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# When creating a new ELB, listeners don't show in the
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# immediately returned result, so just include the
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# ones that were added
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info['listeners'] = [self._listener_as_tuple(l)
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for l in self.listeners]
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else:
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info['listeners'] = []
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if self._check_attribute_support('connection_draining'):
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info['connection_draining_timeout'] = self.elb_conn.get_lb_attribute(self.name, 'ConnectionDraining').timeout
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if self._check_attribute_support('cross_zone_load_balancing'):
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is_cross_az_lb_enabled = self.elb_conn.get_lb_attribute(self.name, 'CrossZoneLoadBalancing')
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if is_cross_az_lb_enabled:
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info['cross_az_load_balancing'] = 'yes'
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else:
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info['cross_az_load_balancing'] = 'no'
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return info
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def _get_elb(self):
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elbs = self.elb_conn.get_all_load_balancers()
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for elb in elbs:
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if self.name == elb.name:
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self.status = 'ok'
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return elb
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def _get_elb_connection(self):
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try:
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return 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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def _delete_elb(self):
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# True if succeeds, exception raised if not
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result = self.elb_conn.delete_load_balancer(name=self.name)
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if result:
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self.changed = True
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self.status = 'deleted'
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def _create_elb(self):
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listeners = [self._listener_as_tuple(l) for l in self.listeners]
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self.elb = self.elb_conn.create_load_balancer(name=self.name,
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zones=self.zones,
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security_groups=self.security_group_ids,
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complex_listeners=listeners,
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subnets=self.subnets,
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scheme=self.scheme)
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if self.elb:
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self.changed = True
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self.status = 'created'
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def _create_elb_listeners(self, listeners):
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"""Takes a list of listener tuples and creates them"""
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# True if succeeds, exception raised if not
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self.changed = self.elb_conn.create_load_balancer_listeners(self.name,
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complex_listeners=listeners)
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def _delete_elb_listeners(self, listeners):
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"""Takes a list of listener tuples and deletes them from the elb"""
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ports = [l[0] for l in listeners]
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# True if succeeds, exception raised if not
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self.changed = self.elb_conn.delete_load_balancer_listeners(self.name,
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ports)
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def _set_elb_listeners(self):
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"""
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Creates listeners specified by self.listeners; overwrites existing
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listeners on these ports; removes extraneous listeners
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"""
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listeners_to_add = []
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listeners_to_remove = []
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listeners_to_keep = []
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# Check for any listeners we need to create or overwrite
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for listener in self.listeners:
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listener_as_tuple = self._listener_as_tuple(listener)
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# First we loop through existing listeners to see if one is
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# already specified for this port
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existing_listener_found = None
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for existing_listener in self.elb.listeners:
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# Since ELB allows only one listener on each incoming port, a
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# single match on the incomping port is all we're looking for
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if existing_listener[0] == listener['load_balancer_port']:
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existing_listener_found = existing_listener.get_complex_tuple()
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break
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if existing_listener_found:
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# Does it match exactly?
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if listener_as_tuple != existing_listener_found:
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# The ports are the same but something else is different,
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# so we'll remove the exsiting one and add the new one
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listeners_to_remove.append(existing_listener_found)
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listeners_to_add.append(listener_as_tuple)
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else:
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# We already have this listener, so we're going to keep it
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listeners_to_keep.append(existing_listener_found)
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else:
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# We didn't find an existing listener, so just add the new one
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listeners_to_add.append(listener_as_tuple)
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# Check for any extraneous listeners we need to remove, if desired
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if self.purge_listeners:
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for existing_listener in self.elb.listeners:
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existing_listener_tuple = existing_listener.get_complex_tuple()
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if existing_listener_tuple in listeners_to_remove:
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# Already queued for removal
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continue
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if existing_listener_tuple in listeners_to_keep:
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# Keep this one around
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continue
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# Since we're not already removing it and we don't need to keep
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# it, let's get rid of it
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listeners_to_remove.append(existing_listener_tuple)
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if listeners_to_remove:
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self._delete_elb_listeners(listeners_to_remove)
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if listeners_to_add:
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self._create_elb_listeners(listeners_to_add)
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def _listener_as_tuple(self, listener):
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"""Formats listener as a 4- or 5-tuples, in the order specified by the
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ELB API"""
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# N.B. string manipulations on protocols below (str(), upper()) is to
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# ensure format matches output from ELB API
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listener_list = [
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listener['load_balancer_port'],
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listener['instance_port'],
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str(listener['protocol'].upper()),
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]
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# Instance protocol is not required by ELB API; it defaults to match
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# load balancer protocol. We'll mimic that behavior here
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if 'instance_protocol' in listener:
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listener_list.append(str(listener['instance_protocol'].upper()))
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else:
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listener_list.append(str(listener['protocol'].upper()))
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if 'ssl_certificate_id' in listener:
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listener_list.append(str(listener['ssl_certificate_id']))
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return tuple(listener_list)
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def _enable_zones(self, zones):
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try:
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self.elb.enable_zones(zones)
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except boto.exception.BotoServerError, e:
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if "Invalid Availability Zone" in e.error_message:
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self.module.fail_json(msg=e.error_message)
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else:
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self.module.fail_json(msg="an unknown server error occurred, please try again later")
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self.changed = True
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def _disable_zones(self, zones):
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try:
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self.elb.disable_zones(zones)
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except boto.exception.BotoServerError, e:
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if "Invalid Availability Zone" in e.error_message:
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self.module.fail_json(msg=e.error_message)
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else:
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self.module.fail_json(msg="an unknown server error occurred, please try again later")
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self.changed = True
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def _attach_subnets(self, subnets):
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self.elb_conn.attach_lb_to_subnets(self.name, subnets)
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self.changed = True
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def _detach_subnets(self, subnets):
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self.elb_conn.detach_lb_from_subnets(self.name, subnets)
|
|
self.changed = True
|
|
|
|
def _set_subnets(self):
|
|
"""Determine which subnets need to be attached or detached on the ELB"""
|
|
if self.subnets:
|
|
if self.purge_subnets:
|
|
subnets_to_detach = list(set(self.elb.subnets) - set(self.subnets))
|
|
subnets_to_attach = list(set(self.subnets) - set(self.elb.subnets))
|
|
else:
|
|
subnets_to_detach = None
|
|
subnets_to_attach = list(set(self.subnets) - set(self.elb.subnets))
|
|
|
|
if subnets_to_attach:
|
|
self._attach_subnets(subnets_to_attach)
|
|
if subnets_to_detach:
|
|
self._detach_subnets(subnets_to_detach)
|
|
|
|
def _set_zones(self):
|
|
"""Determine which zones need to be enabled or disabled on the ELB"""
|
|
if self.zones:
|
|
if self.purge_zones:
|
|
zones_to_disable = list(set(self.elb.availability_zones) -
|
|
set(self.zones))
|
|
zones_to_enable = list(set(self.zones) -
|
|
set(self.elb.availability_zones))
|
|
else:
|
|
zones_to_disable = None
|
|
zones_to_enable = list(set(self.zones) -
|
|
set(self.elb.availability_zones))
|
|
if zones_to_enable:
|
|
self._enable_zones(zones_to_enable)
|
|
# N.B. This must come second, in case it would have removed all zones
|
|
if zones_to_disable:
|
|
self._disable_zones(zones_to_disable)
|
|
|
|
def _set_security_groups(self):
|
|
if self.security_group_ids != None and set(self.elb.security_groups) != set(self.security_group_ids):
|
|
self.elb_conn.apply_security_groups_to_lb(self.name, self.security_group_ids)
|
|
self.Changed = True
|
|
|
|
def _set_health_check(self):
|
|
"""Set health check values on ELB as needed"""
|
|
if self.health_check:
|
|
# This just makes it easier to compare each of the attributes
|
|
# and look for changes. Keys are attributes of the current
|
|
# health_check; values are desired values of new health_check
|
|
health_check_config = {
|
|
"target": self._get_health_check_target(),
|
|
"timeout": self.health_check['response_timeout'],
|
|
"interval": self.health_check['interval'],
|
|
"unhealthy_threshold": self.health_check['unhealthy_threshold'],
|
|
"healthy_threshold": self.health_check['healthy_threshold'],
|
|
}
|
|
|
|
update_health_check = False
|
|
|
|
# The health_check attribute is *not* set on newly created
|
|
# ELBs! So we have to create our own.
|
|
if not self.elb.health_check:
|
|
self.elb.health_check = HealthCheck()
|
|
|
|
for attr, desired_value in health_check_config.iteritems():
|
|
if getattr(self.elb.health_check, attr) != desired_value:
|
|
setattr(self.elb.health_check, attr, desired_value)
|
|
update_health_check = True
|
|
|
|
if update_health_check:
|
|
self.elb.configure_health_check(self.elb.health_check)
|
|
self.changed = True
|
|
|
|
def _check_attribute_support(self, attr):
|
|
return hasattr(boto.ec2.elb.attributes.LbAttributes(), attr)
|
|
|
|
def _set_cross_az_load_balancing(self):
|
|
attributes = self.elb.get_attributes()
|
|
if self.cross_az_load_balancing == 'yes':
|
|
attributes.cross_zone_load_balancing.enabled = True
|
|
else:
|
|
attributes.cross_zone_load_balancing.enabled = False
|
|
self.elb_conn.modify_lb_attribute(self.name, 'CrossZoneLoadBalancing',
|
|
attributes.cross_zone_load_balancing.enabled)
|
|
|
|
def _set_connection_draining_timeout(self):
|
|
attributes = self.elb.get_attributes()
|
|
if self.connection_draining_timeout is not None:
|
|
attributes.connection_draining.enabled = True
|
|
attributes.connection_draining.timeout = self.connection_draining_timeout
|
|
self.elb_conn.modify_lb_attribute(self.name, 'ConnectionDraining', attributes.connection_draining)
|
|
else:
|
|
attributes.connection_draining.enabled = False
|
|
self.elb_conn.modify_lb_attribute(self.name, 'ConnectionDraining', attributes.connection_draining)
|
|
|
|
def _get_health_check_target(self):
|
|
"""Compose target string from healthcheck parameters"""
|
|
protocol = self.health_check['ping_protocol'].upper()
|
|
path = ""
|
|
|
|
if protocol in ['HTTP', 'HTTPS'] and 'ping_path' in self.health_check:
|
|
path = self.health_check['ping_path']
|
|
|
|
return "%s:%s%s" % (protocol, self.health_check['ping_port'], path)
|
|
|
|
|
|
def main():
|
|
argument_spec = ec2_argument_spec()
|
|
argument_spec.update(dict(
|
|
state={'required': True, 'choices': ['present', 'absent']},
|
|
name={'required': True},
|
|
listeners={'default': None, 'required': False, 'type': 'list'},
|
|
purge_listeners={'default': True, 'required': False, 'type': 'bool'},
|
|
zones={'default': None, 'required': False, 'type': 'list'},
|
|
purge_zones={'default': False, 'required': False, 'type': 'bool'},
|
|
security_group_ids={'default': None, 'required': False, 'type': 'list'},
|
|
health_check={'default': None, 'required': False, 'type': 'dict'},
|
|
subnets={'default': None, 'required': False, 'type': 'list'},
|
|
purge_subnets={'default': False, 'required': False, 'type': 'bool'},
|
|
scheme={'default': 'internet-facing', 'required': False},
|
|
connection_draining_timeout={'default': None, 'required': False},
|
|
cross_az_load_balancing={'default': None, 'required': False}
|
|
)
|
|
)
|
|
|
|
module = AnsibleModule(
|
|
argument_spec=argument_spec,
|
|
)
|
|
|
|
region, ec2_url, aws_connect_params = get_aws_connection_info(module)
|
|
if not region:
|
|
module.fail_json(msg="Region must be specified as a parameter, in EC2_REGION or AWS_REGION environment variables or in boto configuration file")
|
|
|
|
name = module.params['name']
|
|
state = module.params['state']
|
|
listeners = module.params['listeners']
|
|
purge_listeners = module.params['purge_listeners']
|
|
zones = module.params['zones']
|
|
purge_zones = module.params['purge_zones']
|
|
security_group_ids = module.params['security_group_ids']
|
|
health_check = module.params['health_check']
|
|
subnets = module.params['subnets']
|
|
purge_subnets = module.params['purge_subnets']
|
|
scheme = module.params['scheme']
|
|
connection_draining_timeout = module.params['connection_draining_timeout']
|
|
cross_az_load_balancing = module.params['cross_az_load_balancing']
|
|
|
|
if state == 'present' and not listeners:
|
|
module.fail_json(msg="At least one port is required for ELB creation")
|
|
|
|
if state == 'present' and not (zones or subnets):
|
|
module.fail_json(msg="At least one availability zone or subnet is required for ELB creation")
|
|
|
|
elb_man = ElbManager(module, name, listeners, purge_listeners, zones,
|
|
purge_zones, security_group_ids, health_check,
|
|
subnets, purge_subnets, scheme,
|
|
connection_draining_timeout, cross_az_load_balancing,
|
|
region=region, **aws_connect_params)
|
|
|
|
# check for unsupported attributes for this version of boto
|
|
if cross_az_load_balancing and not elb_man._check_attribute_support('cross_zone_load_balancing'):
|
|
module.fail_json(msg="You must install boto >= 2.18.0 to use the cross_az_load_balancing attribute")
|
|
|
|
if connection_draining_timeout and not elb_man._check_attribute_support('connection_draining'):
|
|
module.fail_json(msg="You must install boto >= 2.28.0 to use the connection_draining_timeout attribute")
|
|
|
|
if state == 'present':
|
|
elb_man.ensure_ok()
|
|
elif state == 'absent':
|
|
elb_man.ensure_gone()
|
|
|
|
ansible_facts = {'ec2_elb': 'info'}
|
|
ec2_facts_result = dict(changed=elb_man.changed,
|
|
elb=elb_man.get_info(),
|
|
ansible_facts=ansible_facts)
|
|
|
|
module.exit_json(**ec2_facts_result)
|
|
|
|
# import module snippets
|
|
from ansible.module_utils.basic import *
|
|
from ansible.module_utils.ec2 import *
|
|
|
|
main()
|