Docker Compose postgres db does not start - postgresql

Question

Hello for some reason my postgres keeps restarting basically this is my docker compose:
version: "3.7"
services:
db:
image: postgres:12
restart: always
container_name: "db"
ports:
- "${DB_PORT}:5432"
volumes:
- ./pgdata:/var/lib/postgresql/data
environment:
POSTGRES_USER: ${DB_USER}
POSTGRES_PASSWORD: ${DB_PASS}
POSTGRES_DB: ${DB_NAME}
api:
image: server_emasa
container_name: api
restart: always
depends_on:
- db
ports:
- "${SERVER_PORT}:${SERVER_PORT}"
and for some reason my postgres is restarting I tried using the docker compose logs to check and got this:
db | PostgreSQL Database directory appears to contain a database; Skipping initialization
db |
db | 2020-03-26 05:37:18.475 UTC [1] LOG: starting PostgreSQL 12.2 (Debian 12.2-2.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
db | 2020-03-26 05:37:18.475 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432
db | 2020-03-26 05:37:18.475 UTC [1] LOG: listening on IPv6 address "::", port 5432
db | 2020-03-26 05:37:18.558 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
db | 2020-03-26 05:37:18.625 UTC [1] LOG: could not open directory "pg_tblspc": No such file or directory
db | 2020-03-26 05:37:18.646 UTC [26] LOG: database system was interrupted; last known up at 2020-03-23 23:46:31 UTC
db | 2020-03-26 05:37:18.879 UTC [26] LOG: could not open directory "pg_tblspc": No such file or directory
db | 2020-03-26 05:37:18.879 UTC [26] LOG: could not open directory "pg_tblspc": No such file or directory
db | 2020-03-26 05:37:18.879 UTC [26] FATAL: could not open directory "pg_replslot": No such file or directory
db | 2020-03-26 05:37:18.880 UTC [1] LOG: startup process (PID 26) exited with exit code 1
db | 2020-03-26 05:37:18.880 UTC [1] LOG: aborting startup due to startup process failure
db | 2020-03-26 05:37:18.881 UTC [1] LOG: database system is shut down

Answer 1

I also had a similar problem after restarting my postgresql container:
LOG: could not open directory "pg_tblspc/memory/...": Not a directory
The reason of the error is probably because of data corruption in database.
You can solve the issue by deleting contents of pg_tblspc/ directory (make sure to backup all of them) or you can also try by recovering the latest backup of your database (if there's one).

Answer 2

The error refers to postgresql not being able to find critical files, but is not attempting to create them because your pgdata directory contains some files.
Try not to bind your pgdata directory to the docker container, just remove the volumes section in your docker-compose file

Answer 3

first remove associated docker volume and data folder then:
POSTGRES_DB: ${DB_NAME} will not work, use like this:
environment:
- 'POSTGRES_DB=med_db'
- 'POSTGRES_USER:postgres'
- 'POSTGRES_PASSWORD:pass'