Using ansible launch configuration module ec2_lc and securitygroup names versus id - linux

Question

I want to accomplish the following in aws ec2:
Create security groups using ansible module ec2_group.
Create a launch configuration using ansible module ec2_lc and attach a security group created earlier.
Now, i want to use the security group names instead of id's because i want to be able to recreate the whole infrastructure with ansible if needed.
Recreating security groups will cause the id of the group to be different.
But the ec2_lc module only accepts security group id's.
Is there any way i can map a security group id to a name?
I am defining security groups like this:
- name: create ec2 group
ec2_group:
name: "{{ item.name }}"
description: "{{ item.description }}"
vpc_id: "{{ item.vpc_id }}"
region: "{{ item.region }}"
state: present
rules: "{{ item.rules }}"
rules_egress: "{{ item.rules_egress }}"
register: sg
The launch configuration code looks like this:
- name: Create Launch Configuration
ec2_lc:
region: "{{ item.region }}"
name: "{{ item.name }}"
image_id: "{{ item.image_id }}"
key_name: "{{ item.key_name }}"
security_groups: "{{ item.security_groups }}" # how can i refer to specific group_id based on a group name?
instance_type: "{{ item.instance_type }}"
user_data: "{{ item.ec2_user_data }}"
instance_profile_name: "{{ item.instance_profile_name }}"
assign_public_ip: "{{ item.assign_public_ip }}"

Answer 1

Use the ec2_group-facts to query the security groups by name:
- ec2_group_facts:
filters:
group-name:
- "{{ sg.name }}"
register: ec2sgs
- debug:
msg: "{{ ec2sgs.security_groups | map(attribute='group_id')| list }}"

Answer 2

With some tribute to this question, you can try this:
- name: Create Launch Configuration
ec2_lc:
...
security_groups: "{{ sg.results | selectattr('item.name','equalto',item) | join('',attribute='group_id') }}"
...

Answer 3

You can write a filter, that can make an aws api call for you dynamically.
For instance I have something like this in my vars/main.yml
public_sg_id: "{{ 'Public' |get_sg(public_vpc_id, aws_region) }}"
Here is the code for get_sg filter.
import boto.ec2
from ansible import errors
def get_sg(name, vpc_id, region):
connect = boto.ec2.connect_to_region(region)
filter_by = {
"tag-key": "Name",
"tag-value": name,
"vpc-id": vpc_id
}
sg_groups = connect.get_all_security_groups(filters=filter_by)
if len(sg_groups) == 1:
return sg_groups[0].id
elif len(sg_groups) > 1:
raise errors.AnsibleFilterError(
"Too many results for {0}: {1}".format(
name, ",".join(sg_groups)
)
)
else:
raise errors.AnsibleFilterError(
"Security Group {0} was not found".format(name)
)