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# ec2_asg – Create or delete AWS Autoscaling Groups

- Synopsis

- Requirements

- Parameters

- Notes

- Examples

- Return Values

- Status

## Synopsis

- Can create or delete AWS Autoscaling Groups

- Can be used with the ec2_lc module to manage Launch Configurations

## Requirements

The below requirements are needed on the host that executes this module.

- boto

- boto3

- botocore

- python >= 2.6

## Parameters

Parameter | Choices/Defaults | Comments
--- | --- | ---
availability_zones - |  | List of availability zone names in which to create the group. Defaults to all the availability zones in the region if vpc_zone_identifier is not set.
aws_access_key string |  | AWS access key. If not set then the value of the AWS_ACCESS_KEY_ID, AWS_ACCESS_KEY or EC2_ACCESS_KEY environment variable is used. aliases: ec2_access_key, access_key
aws_secret_key string |  | AWS secret key. If not set then the value of the AWS_SECRET_ACCESS_KEY, AWS_SECRET_KEY, or EC2_SECRET_KEY environment variable is used. aliases: ec2_secret_key, secret_key
debug_botocore_endpoint_logs boolean added in 2.8 | Choices: no ← yes | Use a botocore.endpoint logger to parse the unique (rather than total) "resource:action" API calls made during a task, outputing the set to the resource_actions key in the task results. Use the aws_resource_action callback to output to total list made during a playbook. The ANSIBLE_DEBUG_BOTOCORE_LOGS environment variable may also be used.
default_cooldown - | Default: "300 seconds" | The number of seconds after a scaling activity completes before another can begin.
desired_capacity - |  | Desired number of instances in group, if unspecified then the current group value will be used.
ec2_url string |  | Url to use to connect to EC2 or your Eucalyptus cloud (by default the module will use EC2 endpoints). Ignored for modules where region is required. Must be specified for all other modules if region is not used. If not set then the value of the EC2_URL environment variable, if any, is used.
health_check_period - | Default: "300 seconds" | Length of time in seconds after a new EC2 instance comes into service that Auto Scaling starts checking its health.
health_check_type - | Choices: EC2 ← ELB | The service you want the health status from, Amazon EC2 or Elastic Load Balancer.
launch_config_name - |  | Name of the Launch configuration to use for the group. See the ec2_lc module for managing these. If unspecified then the current group value will be used. One of launch_config_name or launch_template must be provided.
launch_template - added in 2.8 |  | Dictionary describing the Launch Template to use
| launch_template_id - |  | The id of the launch template. Only one of launch_template_name or launch_template_id is required.
| launch_template_name - |  | The name of the launch template. Only one of launch_template_name or launch_template_id is required.
| version - | Default: "latest" | The version number of the launch template to use. Defaults to latest version if not provided.
lc_check boolean | Choices: no yes ← | Check to make sure instances that are being replaced with replace_instances do not already have the current launch_config.
load_balancers - |  | List of ELB names to use for the group. Use for classic load balancers.
lt_check boolean added in 2.8 | Choices: no yes ← | Check to make sure instances that are being replaced with replace_instances do not already have the current launch_template or launch_template version.
max_size - |  | Maximum number of instances in group, if unspecified then the current group value will be used.
metrics_collection boolean added in 2.6 | Choices: no ← yes | Enable ASG metrics collection
metrics_granularity - added in 2.6 | Default: "1minute" | When metrics_collection is enabled this will determine granularity of metrics collected by CloudWatch
metrics_list - added in 2.6 | Default: ["GroupMinSize", "GroupMaxSize", "GroupDesiredCapacity", "GroupInServiceInstances", "GroupPendingInstances", "GroupStandbyInstances", "GroupTerminatingInstances", "GroupTotalInstances"] | List of autoscaling metrics to collect when enabling metrics_collection
min_size - |  | Minimum number of instances in group, if unspecified then the current group value will be used.
name - / required |  | Unique name for group to be created or deleted
notification_topic - |  | A SNS topic ARN to send auto scaling notifications to.
notification_types - | Default: ["autoscaling:EC2_INSTANCE_LAUNCH", "autoscaling:EC2_INSTANCE_LAUNCH_ERROR", "autoscaling:EC2_INSTANCE_TERMINATE", "autoscaling:EC2_INSTANCE_TERMINATE_ERROR"] | A list of auto scaling events to trigger notifications on.
placement_group - |  | Physical location of your cluster placement group created in Amazon EC2.
profile string |  | Uses a boto profile. Only works with boto >= 2.24.0.
region string |  | The AWS region to use. If not specified then the value of the AWS_REGION or EC2_REGION environment variable, if any, is used. See http://docs.aws.amazon.com/general/latest/gr/rande.html#ec2_region aliases: aws_region, ec2_region
replace_all_instances boolean | Choices: no ← yes | In a rolling fashion, replace all instances that used the old launch configuration with one from the new launch configuration. It increases the ASG size by `replace_batch_size`, waits for the new instances to be up and running. After that, it terminates a batch of old instances, waits for the replacements, and repeats, until all old instances are replaced. Once that's done the ASG size is reduced back to the expected size.
replace_batch_size - | Default: 1 | Number of instances you'd like to replace at a time. Used with replace_all_instances.
replace_instances - |  | List of instance_ids belonging to the named ASG that you would like to terminate and be replaced with instances matching the current launch configuration.
security_token string |  | AWS STS security token. If not set then the value of the AWS_SECURITY_TOKEN or EC2_SECURITY_TOKEN environment variable is used. aliases: access_token
state - | Choices: present ← absent | register or deregister the instance
suspend_processes - | Choices: Launch Terminate HealthCheck ReplaceUnhealthy AZRebalance AlarmNotification ScheduledActions AddToLoadBalancer Default: [] | A list of scaling processes to suspend.
tags - |  | A list of tags to add to the Auto Scale Group. Optional key is 'propagate_at_launch', which defaults to true.
target_group_arns - added in 2.4 |  | List of target group ARNs to use for the group. Use for application load balancers.
termination_policies - | Choices: OldestInstance NewestInstance OldestLaunchConfiguration ClosestToNextInstanceHour Default ← | An ordered list of criteria used for selecting instances to be removed from the Auto Scaling group when reducing capacity. For 'Default', when used to create a new autoscaling group, the "Default"i value is used. When used to change an existent autoscaling group, the current termination policies are maintained.
validate_certs boolean | Choices: no yes ← | When set to "no", SSL certificates will not be validated for boto versions >= 2.6.0.
vpc_zone_identifier - |  | List of VPC subnets to use
wait_for_instances boolean | Choices: no yes ← | Wait for the ASG instances to be in a ready state before exiting. If instances are behind an ELB, it will wait until the ELB determines all instances have a lifecycle_state of "InService" and a health_status of "Healthy".
wait_timeout - | Default: 300 | How long to wait for instances to become viable when replaced. If you experience the error "Waited too long for ELB instances to be healthy", try increasing this value.

## Notes

Note

- If parameters are not set within the module, the following environment variables can be used in decreasing order of precedence `AWS_URL` or `EC2_URL`, `AWS_ACCESS_KEY_ID` or `AWS_ACCESS_KEY` or `EC2_ACCESS_KEY`, `AWS_SECRET_ACCESS_KEY` or `AWS_SECRET_KEY` or `EC2_SECRET_KEY`, `AWS_SECURITY_TOKEN` or `EC2_SECURITY_TOKEN`, `AWS_REGION` or `EC2_REGION`

- Ansible uses the boto configuration file (typically ~/.boto) if no credentials are provided. See https://boto.readthedocs.io/en/latest/boto_config_tut.html

- `AWS_REGION` or `EC2_REGION` can be typically be used to specify the AWS region, when required, but this can also be configured in the boto config file

## Examples

    # Basic configuration with Launch Configuration

    - ec2_asg:
        name: special
        load_balancers: [ 'lb1', 'lb2' ]
        availability_zones: [ 'eu-west-1a', 'eu-west-1b' ]
        launch_config_name: 'lc-1'
        min_size: 1
        max_size: 10
        desired_capacity: 5
        vpc_zone_identifier: [ 'subnet-abcd1234', 'subnet-1a2b3c4d' ]
        tags:
          - environment: production
            propagate_at_launch: no

    # Rolling ASG Updates

    # Below is an example of how to assign a new launch config to an ASG and terminate old instances.
    #
    # All instances in "myasg" that do not have the launch configuration named "my_new_lc" will be terminated in
    # a rolling fashion with instances using the current launch configuration, "my_new_lc".
    #
    # This could also be considered a rolling deploy of a pre-baked AMI.
    #
    # If this is a newly created group, the instances will not be replaced since all instances
    # will have the current launch configuration.

    - name: create launch config
      ec2_lc:
        name: my_new_lc
        image_id: ami-lkajsf
        key_name: mykey
        region: us-east-1
        security_groups: sg-23423
        instance_type: m1.small
        assign_public_ip: yes

    - ec2_asg:
        name: myasg
        launch_config_name: my_new_lc
        health_check_period: 60
        health_check_type: ELB
        replace_all_instances: yes
        min_size: 5
        max_size: 5
        desired_capacity: 5
        region: us-east-1

    # To only replace a couple of instances instead of all of them, supply a list
    # to "replace_instances":

    - ec2_asg:
        name: myasg
        launch_config_name: my_new_lc
        health_check_period: 60
        health_check_type: ELB
        replace_instances:
        - i-b345231
        - i-24c2931
        min_size: 5
        max_size: 5
        desired_capacity: 5
        region: us-east-1

    # Basic Configuration with Launch Template

    - ec2_asg:
        name: special
        load_balancers: [ 'lb1', 'lb2' ]
        availability_zones: [ 'eu-west-1a', 'eu-west-1b' ]
        launch_template:
            version: '1'
            launch_template_name: 'lt-example'
            launch_template_id: 'lt-123456'
        min_size: 1
        max_size: 10
        desired_capacity: 5
        vpc_zone_identifier: [ 'subnet-abcd1234', 'subnet-1a2b3c4d' ]
        tags:
          - environment: production
            propagate_at_launch: no

## Return Values

Common return values are documented here, the following are the fields unique to this module:

Key | Returned | Description
--- | --- | ---
auto_scaling_group_arn string | success | The unique ARN of the autoscaling group Sample: arn:aws:autoscaling:us-east-1:123456789012:autoScalingGroup:6a09ad6d-eeee-1234-b987-ee123ced01ad:autoScalingGroupName/myasg
auto_scaling_group_name string | success | The unique name of the auto scaling group Sample: myasg
availability_zones list | success | The availability zones for the auto scaling group Sample: ['us-east-1d']
created_time string | success | Timestamp of create time of the auto scaling group Sample: 2017-11-08T14:41:48.272000+00:00
default_cooldown integer | success | The default cooldown time in seconds. Sample: 300
desired_capacity integer | success | The number of EC2 instances that should be running in this group. Sample: 3
healthcheck_period integer | success | Length of time in seconds after a new EC2 instance comes into service that Auto Scaling starts checking its health. Sample: 30
healthcheck_type string | success | The service you want the health status from, one of "EC2" or "ELB". Sample: ELB
healthy_instances integer | success | Number of instances in a healthy state Sample: 5
in_service_instances integer | success | Number of instances in service Sample: 3
instance_facts dictionary | success | Dictionary of EC2 instances and their status as it relates to the ASG. Sample: {'i-0123456789012': {'health_status': 'Healthy', 'launch_config_name': 'public-webapp-production-1', 'lifecycle_state': 'InService'}}
instances list | success | list of instance IDs in the ASG Sample: ['i-0123456789012']
launch_config_name string | success | Name of launch configuration associated with the ASG. Same as launch_configuration_name, provided for compatibility with ec2_asg module. Sample: public-webapp-production-1
load_balancers list | success | List of load balancers names attached to the ASG. Sample: ['elb-webapp-prod']
max_size integer | success | Maximum size of group Sample: 3
metrics_collection list | success | List of enabled AutosSalingGroup metrics Sample: [{'Granularity': '1Minute', 'Metric': 'GroupInServiceInstances'}]
min_size integer | success | Minimum size of group Sample: 1
pending_instances integer | success | Number of instances in pending state Sample: 1
tags list | success | List of tags for the ASG, and whether or not each tag propagates to instances at launch. Sample: [{'key': 'Name', 'value': 'public-webapp-production-1', 'resource_id': 'public-webapp-production-1', 'resource_type': 'auto-scaling-group', 'propagate_at_launch': 'true'}, {'key': 'env', 'value': 'production', 'resource_id': 'public-webapp-production-1', 'resource_type': 'auto-scaling-group', 'propagate_at_launch': 'true'}]
target_group_arns list | success | List of ARNs of the target groups that the ASG populates Sample: ['arn:aws:elasticloadbalancing:ap-southeast-2:123456789012:targetgroup/target-group-host-hello/1a2b3c4d5e6f1a2b', 'arn:aws:elasticloadbalancing:ap-southeast-2:123456789012:targetgroup/target-group-path-world/abcd1234abcd1234']
target_group_names list | success | List of names of the target groups that the ASG populates Sample: ['target-group-host-hello', 'target-group-path-world']
termination_policies string | success | A list of termination policies for the group. Sample: ['Default']
unhealthy_instances integer | success | Number of instances in an unhealthy state
viable_instances integer | success | Number of instances in a viable state Sample: 1
vpc_zone_identifier string | success | VPC zone ID / subnet id for the auto scaling group Sample: subnet-a31ef45f

## Status

- This module is guaranteed to have backward compatible interface changes going forward. [stableinterface]

- This module is maintained by the Ansible Community. [community]

### Authors

- Gareth Rushgrove (@garethr)

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