Ansible: Create new RDS DB from last snapshot of another DB - amazon-web-services

Question

Promote command does not seem to work on the version of Ansible that I am using.
So I am trying to create a new database as a replica of an existing one and after making it master, delete the source database.
I was trying to do it like this:
Make replica
Promote replica
Delete source database
But now I am thinking of this:
Create new database from source database last snapshot [as master from the beginning]
Delete the source database
How would that playbook go?
My playbook:
- hosts: localhost
vars:
source_db_name: "{{ SOURCE_DB }}" # stagingdb
new_db_name: "{{ NEW_DB }}" # stagingdb2
tasks:
- name: Make RDS replica
local_action:
module: rds
region: us-east-1
command: replicate
instance_name : "{{ new_db_name }}"
source_instance: "{{ source_db_name }}"
wait: yes
wait_timeout: 900 # wait 15 minutes
# Notice - not working [Ansible bug]
- name: Promote RDS replica
local_action:
module: rds
region: us-east-1
command: promote
instance_name: "{{ new_db_name }}" # stagingdb2
backup_retention: 0
wait: yes
wait_timeout: 300
- name: Delete source db
local_action:
command: delete
instance_name: "{{ source_db_name }}"
region: us-east-1

Answer 1

You just need to use the restore command in the RDS module.
Your playbook would then look something like:
- hosts: localhost
connection: local
gather_facts: yes
vars:
date: "{{ ansible_date_time.year }}-{{ ansible_date_time.month }}-{{ ansible_date_time.day }}-{{ ansible_date_time.hour }}-{{ ansible_date_time.minute }}"
source_db_name: "{{ SOURCE_DB }}" # stagingdb
new_db_name: "{{ NEW_DB }}" # stagingdb2
snapshot_name: "snapshot-{{ source_db_name }}--{{ date }}"
tasks:
- name : Take RDS snapshot
rds :
command : snapshot
instance_name : "{{ source_db_name }}"
snapshot : "{{ snapshot_name }}"
wait : yes
register: snapshot_out
- name : get facts
rds :
command : facts
instance_name : "{{ instance_name }}"
register: db_facts
- name : Restore RDS from snapshot
rds :
command : restore
instance_name : "{{ new_db_name }}"
snapshot : "{{ snapshot_name }}"
instance_type : "{{ db_facts.instance.instance_type }}"
subnet : primary # Unfortunately this isn't returned by db_facts
wait : yes
wait_timeout : 1200
- name : Delete source db
rds :
command : delete
instance_name : "{{ source_db_name }}"
There's a couple of extra tricks in there:
I set connection to local at the start of the play so, when combined with hosts: localhost all of the tasks will be local tasks.
I build a date time stamp that looks like YYYY-mm-dd-hh-mm from the Ansible host's own facts (from gather_facts and it only targeting localhost). This is then used for the snapshot name to make sure that we create it (if one exists with the same name then Ansible won't create another snapshot - something that could be bad in this case as it would use an older snapshot before deleting your source database).
I fetch the facts about the RDS instance in a task and use that to set the instance type to be the same as the source database. If you don't want that then you can define the instance_type directly and remove the whole get facts task