Pgadmin container kills postgres when using docker-compose - postgresql

Question

I run postgres using docker-compose -f postgres.yml up. When I try to run pgadmin4 using docker-compose -f pgadmin4.yml up, postgres container is automatically killed.
I am new to docker and doesn't understand why is this issue happening?
postgres.yml
version: "3.7"
services:
postgres:
container_name: "postgres"
image: "postgres"
ports:
- "5432:5432"
environment:
POSTGRES_PASSWORD: ****
volumes:
- maple:/var/lib/postgresql/data
volumes:
maple:
name: maple
external: true
pgadmin.yml
version: "3.7"
services:
postgres:
container_name: "pgadmin4"
image: "dpage/pgadmin4"
ports:
- "5433:80"
environment:
PGADMIN_DEFAULT_EMAIL: ******
PGADMIN_DEFAULT_PASSWORD: *****
volumes:
- pgadmin4-vol:/var/lib/pgadmin
volumes:
pgadmin4-vol:
name: pgadmin4-vol
external: true
$ docker-compose -f psql.yml up
Starting postgres ... done
Attaching to postgres
postgres |
postgres | PostgreSQL Database directory appears to contain a database; Skipping initialization
postgres |
postgres | 2020-11-27 10:18:05.635 UTC 1 LOG: starting PostgreSQL 13.0 (Debian 13.0-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
postgres | 2020-11-27 10:18:05.636 UTC 1 LOG: listening on IPv4 address "0.0.0.0", port 5432
postgres | 2020-11-27 10:18:05.636 UTC 1 LOG: listening on IPv6 address "::", port 5432
postgres | 2020-11-27 10:18:05.639 UTC 1 LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
postgres | 2020-11-27 10:18:05.643 UTC [24] LOG: database system was shut down at 2020-11-27 10:17:59 UTC
postgres | 2020-11-27 10:18:05.647 UTC 1 LOG: database system is ready to accept connections
postgres | 2020-11-27 10:18:11.089 UTC 1 LOG: received fast shutdown request
postgres | 2020-11-27 10:18:11.092 UTC 1 LOG: aborting any active transactions
postgres | 2020-11-27 10:18:11.099 UTC 1 LOG: background worker "logical replication launcher" (PID 30) exited with exit code 1
postgres | 2020-11-27 10:18:11.108 UTC [25] LOG: shutting down
postgres | 2020-11-27 10:18:11.127 UTC 1 LOG: database system is shut down
postgres exited with code 0
$ docker-compose -f pgadmin.yml up
Recreating postgres ... done
Attaching to pgadmin4
pgadmin4 | sudo: setrlimit(RLIMIT_CORE): Operation not permitted
pgadmin4 | [2020-11-27 10:18:13 +0000] 1 [INFO] Starting gunicorn 19.9.0
pgadmin4 | [2020-11-27 10:18:13 +0000] 1 [INFO] Listening at: http://[::]:80 (1)
pgadmin4 | [2020-11-27 10:18:13 +0000] 1 [INFO] Using worker: threads
pgadmin4 | /usr/local/lib/python3.8/os.py:1023: RuntimeWarning: line buffering (buffering=1) isn't supported in binary mode, the default buffer size will be used
pgadmin4 | return io.open(fd, *args, **kwargs)
pgadmin4 | [2020-11-27 10:18:13 +0000] [87] [INFO] Booting worker with pid: 87
docker inpsect 69438bebc3f9 here

Answer 1

your services are both named postgres
so the pgadmin.yml recreates the service postgres, wich is your first database container.. as the logs are clearly showing
'Recreating postgres ... done'
take another name for the pgadmin service then postgres and it should work.
version: "3.7"
services:
pgadmin:
also docker-compose is for building stacks, if you would have done this in one compose file you would have seen the error from begin:
docker-compose.failing.yml:
version: "3.7"
services:
postgres:
container_name: "postgres"
image: "postgres"
ports:
- "5432:5432"
environment:
POSTGRES_PASSWORD: test
volumes:
- maple:/var/lib/postgresql/data
postgres:
container_name: "pgadmin4"
image: "dpage/pgadmin4"
ports:
- "5433:80"
environment:
PGADMIN_DEFAULT_EMAIL: test
PGADMIN_DEFAULT_PASSWORD: test
volumes:
- pgadmin4-vol:/var/lib/pgadmin
volumes:
maple:
name: maple
external: true
pgadmin4-vol:
name: pgadmin4-vol
external: true
docker-compose.working.yml:
version: "3.7"
services:
postgres:
container_name: "postgres"
image: "postgres"
ports:
- "5432:5432"
environment:
POSTGRES_PASSWORD: test
volumes:
- maple:/var/lib/postgresql/data
pgadmin:
container_name: "pgadmin4"
image: "dpage/pgadmin4"
ports:
- "5433:80"
environment:
PGADMIN_DEFAULT_EMAIL: test
PGADMIN_DEFAULT_PASSWORD: test
volumes:
- pgadmin4-vol:/var/lib/pgadmin
volumes:
maple:
name: maple
external: true
pgadmin4-vol:
name: pgadmin4-vol
external: true