Postgres cluster with streaming replication and pgpool

pgpool.yaml

version: '3.8'

services:

  pgmaster:
    image: bitnami/postgresql:latest
    ports:
      - 5432
    volumes:
      - pgmaster_data:/bitnami/postgresql
    environment:
      - POSTGRESQL_REPLICATION_MODE=master
      - POSTGRESQL_REPLICATION_USER=postgres
      - POSTGRESQL_REPLICATION_PASSWORD=s3cret
      - POSTGRESQL_PASSWORD=s3cret
      - POSTGRESQL_DATABASE=platform

  pgslave:
    image: bitnami/postgresql:latest
    ports:
      - 5432
    depends_on:
      - pgmaster
    environment:
      - POSTGRESQL_REPLICATION_MODE=slave
      - POSTGRESQL_REPLICATION_USER=postgres
      - POSTGRESQL_REPLICATION_PASSWORD=s3cret
      - POSTGRESQL_MASTER_HOST=pgmaster
      - POSTGRESQL_PASSWORD=s3cret

  pgpool:
    image: docker.io/bitnami/pgpool:latest
    ports:
      - 5432:5432
    depends_on:
      - pgmaster
    volumes:
      - ./pgpool.conf:/config/pgpool.conf
    environment:
      - PGPOOL_USER_CONF_FILE=/config/pgpool.conf
      - PGPOOL_BACKEND_NODES=0:pgmaster:5432:4:master:ALWAYS_MASTER,1:pgslave:5432:6:replica1
      - PGPOOL_SR_CHECK_USER=postgres
      - PGPOOL_SR_CHECK_PASSWORD=s3cret
      - PGPOOL_ENABLE_LDAP=no
      - PGPOOL_POSTGRES_USERNAME=postgres
      - PGPOOL_POSTGRES_PASSWORD=s3cret
      - PGPOOL_ADMIN_USERNAME=admin
      - PGPOOL_ADMIN_PASSWORD=s3cret
      - PGPOOL_ENABLE_LOAD_BALANCING=yes
      - PGPOOL_ENABLE_STATEMENT_LOAD_BALANCING=yes
      - PGPOOL_NUM_INIT_CHILDREN=10
      - PGPOOL_MAX_POOL=1
      - PGPOOL_EXTRA_FLAGS=-d

volumes:
  pgmaster_data: