ansible docker postgres volume - postgresql

Question

i am doing some postgres deployment with docker, ansible and terraform in aws
things are going relatively well, i start the instance with terraform, provision the instance with docker using ansible, start my postgres container with ansible also, and attach a ebs volume to my instance, which i intend to use as the main data storage.
but i am confused as to how to attach the volume to the docker (not to the instance as i am able to do that using terraform)
i imagine it is possible using ansible or modifiying the dockerfile, but the documentation of the "volume" which seems to be the answer is not that clear to me.
so if i had an ansible playbook like this:
name: Start postgis
docker_container:
name: postgis
image: "{{ ecr_url }}"
network_mode: bridge
exposed_ports:
5432
published_ports:
5432:5432
state: started
how would i specify the ebs volume to be used for the data storage of Postgres?
resource "aws_volume_attachment" "ebs-volume-postgis-attach" {
device_name = "/dev/xvdh"
volume_id = "${aws_ebs_volume.ebs-volume-postgis.id}"
instance_id = "${aws_instance.postgis.id}"
}
that was the code used to attach the ebs volume, in case someone is interested
please ask any kind of info that you need, all help is deeply apreciated

Answer 1

Here is a checklist:
Attach EBS volume (disk) to EC2 instance (e.g. /dev/xvdh)
Make partition (optional) (e.g. /dev/xvdh1)
Make filesystem on the partition/disk
Mount filesystem inside your EC2 instance (e.g. /opt/ebs_data)
Start Docker-container with volume (e.g. /opt/ebs_data:/var/lib/postgresql/data)
In Ansible's docker_container module, volumes is a list, so:
- docker_container:
name: postgis
image: "{{ ecr_url }}"
network_mode: bridge
exposed_ports:
- 5432
published_ports:
- 5432:5432
state: started
volumes:
- /opt/ebs_data:/var/lib/postgresql/data