docker-compose multiple postgres databases - docker-compose

Question

I try to up several postgres databases by writing docker-compose file and create database when container is up. The problem is - that database is not created
I do not understand why it doesn't create. But if i try to up only one postgres it works. What i missed?
works well:
services:
tenant_first:
image: postgres
restart: always
volumes:
- pgdata:/var/lib/postgresql/data/
environment:
- POSTGRES_PASSWORD=postgres
- POSTGRES_USER=postgres
- POSTGRES_DB=tenant_first
ports:
- 50005:5432
Doesn't work (not create database if more than one recording)
services:
tenant_first:
image: postgres
restart: always
volumes:
- pgdata:/var/lib/postgresql/data/
environment:
- POSTGRES_PASSWORD=postgres
- POSTGRES_USER=postgres
- POSTGRES_DB=tenant_first
ports:
- 50005:5432
tenant_second:
image: postgres
restart: always
volumes:
- pgdata:/var/lib/postgresql/data/
environment:
- POSTGRES_PASSWORD=postgres
- POSTGRES_USER=postgres
- POSTGRES_DB=tenant_second
ports:
- 50008:5432
I did it works adding volumes
volumes:
pgdata:
pgdata2:

Answer 1

Here the full workable solution what i did
version: '3.3'
services:
tenant_first:
image: postgres
restart: always
volumes:
- pgdata:/var/lib/postgresql/data/
- ./sql/initdb.sh:/docker-entrypoint-initdb.d/initdb.sh
environment:
- POSTGRES_PASSWORD=postgres
- POSTGRES_USER=postgres
ports:
- 50005:5432
#
tenant_fours:
image: postgres
restart: always
volumes:
- pgdata2:/var/lib/postgresql/data/
- ./sql/initdb_f.sh:/docker-entrypoint-initdb.d/initdb_f.sh
environment:
- POSTGRES_PASSWORD=postgres
- POSTGRES_USER=postgres
ports:
- 50008:5432
networks:
default:
external:
name: flask_mu_one_dbs
volumes:
pgdata:
pgdata2:
initdb.sh
#!/bin/bash
psql -U postgres
psql -c "create database tenant_first"
initdb_f.sh
#!/bin/bash
psql -U postgres
psql -c "create database tenant_fours"