docker-compose.yml

version: '3.1'

services:
  # we will use pgadmin4 for master database.
  pgadmin4-master:
    image: fenglc/pgadmin4
    ports:
      - 5050:5050
    links:
      - postgres-master:postgres-master
    environment:
      DEFAULT_USER: masterdatabase
      DEFAULT_PASSWORD: 12345678
  # we will use postgres as master database.
  postgres-master:
    image: nebirhos/postgres-replication
    environment:
      POSTGRES_USER: postgres     # define credentials
      POSTGRES_PASSWORD: postgres # define credentials
      POSTGRES_DB: postgres       # define database
    ports:
      - 5432:5432                 # Postgres port	  
  
  # we will use pgadmin4 for slave database.
  pgadmin4-slave:
    image: fenglc/pgadmin4
    ports:
      - 5060:5050
    links:
      - postgres-slave:postgres-slave
    environment:
      DEFAULT_USER: slavedatabase
      DEFAULT_PASSWORD: 12345678
  
  # we will use postgres as slave database.
  postgres-slave:
    image: nebirhos/postgres-replication
    environment:
      POSTGRES_USER: postgres     # define credentials
      POSTGRES_PASSWORD: postgres # define credentials
      POSTGRES_DB: postgres       # define database
      POSTGRES_MASTER_SERVICE_HOST: postgres-master
      REPLICATION_ROLE: slave
    ports:
      - 5433:5432                 # Postgres port
    links:
      - postgres-master