Implemented docker postgres draft

roles/docker-postgres/README.md

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+# Docker-Postgres Ansible Role
+
+## Overview
+This Ansible role is designed to deploy a PostgreSQL database using Docker. It includes tasks for setting up a Docker network, installing PostgreSQL in a Docker container, and initializing the database with a specified user and database.
+
+## Role Variables
+- `central_postgres_password`: The password for the PostgreSQL superuser (`postgres`).
+- `database_databasename`: Name of the database to be created.
+- `database_username`: Username for the database user.
+- `database_password`: Password for the database user.
+
+## Role Tasks
+1. **Create Docker network for PostgreSQL**: Sets up a Docker network for PostgreSQL communication.
+2. **Install PostgreSQL**: Deploys PostgreSQL in a Docker container, attaching it to the created network and setting the superuser password.
+3. **Run the docker_postgres tasks once**: Ensures that the tasks are only run once to avoid redundancy.
+
+## Handlers
+- **Create database**: Creates a new database with the specified name.
+- **Create database user**: Sets up a user with full privileges on the newly created database.
+
+## Usage
+1. Set the required variables in your playbook or inventory file.
+2. Include this role in your playbook.
+3. Run the playbook against the target host.
+
+## Notes
+- The PostgreSQL server is bound to `127.0.0.1:5432` on the host machine, making it accessible only from localhost.
+- Ensure that the provided passwords are secure and stored securely, preferably using Ansible Vault or another encryption method.

roles/docker-postgres/handlers/main.yml

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+- name: Create database
+  postgresql_db:
+    name: "{{ database_databasename }}"
+    state: present
+    login_user: postgres
+    login_password: "{{ central_postgres_password }}"
+    login_host: 127.0.0.1
+    login_port: 5432
+  listen: create database
+
+- name: Create database user
+  postgresql_user:
+    name: "{{ database_username }}"
+    password: "{{ database_password }}"
+    db: "{{ database_databasename }}"
+    priv: ALL
+    state: present
+    login_user: postgres
+    login_password: "{{ central_postgres_password }}"
+    login_host: 127.0.0.1
+    login_port: 5432
+  listen: create database

roles/docker-postgres/tasks/main.yml

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+- name: Create Docker network for PostgreSQL
+  docker_network:
+    name: postgres_network
+    state: present
+  when: run_once_docker_postgres is not defined
+
+- name: Install PostgreSQL
+  docker_container:
+    name: postgres
+    image: postgres:latest
+    detach: yes
+    env:
+      POSTGRES_PASSWORD: "{{ central_postgres_password }}"
+    networks:
+      - name: postgres_network
+    published_ports:
+      - "127.0.0.1:5432:5432"
+  when: run_once_docker_postgres is not defined
+
+- name: Run the docker_postgres tasks once
+  set_fact:
+    run_once_docker_postgres: true
+  when: run_once_docker_postgres is not defined