有没有一种方法可以创建RDS实例的跨区域只读副本？

Question

I need to create a read only replica in a different region via Ansible.

The docs don't seem to mention if this is possible. They only mention normal read only replicas:

# Create a read-only replica and wait for it to become available
- rds:
    command: replicate
    instance_name: new-database-replica
    source_instance: new_database
    wait: yes
    wait_timeout: 600

Answer 1

When creating cross region replicas it works pretty much exactly the same as creating normal read replicas except that instead of specifying the instance identifier you must specify the full ARN. This then means that if you have a source instance called my-mysql-instance in US East 1 in the account 123456789012 then your ARN (and so instance_name parameter to the RDS module) will look like this:

arn:aws:rds:us-east-1:123456789012:db:my-mysql-instance

So you just need to adapt the replicate task from the docs to be something like this:

- rds:
    command: replicate
    region: eu-west-1
    instance_name: new-database-replica
    source_instance: arn:aws:rds:us-east-1:123456789012:db:my-mysql-instance
    wait: yes
    wait_timeout: 600

This will create a new read replica in EU West 1 (Ireland) called new-database-replica from a source database instance called my-mysql-instance in US West 1.