pgAdmin Docker Error: 'Incorect username or password'

Question

Have some simple docker-compose.yml file configuration, but I am not sure why I can't not login to pgAdmin using [email protected] as email and admin as a password. Does it need more configuration or am I using wrong credentials?

version: "3.7"

services:
    db:
        image: postgres:13.1
        restart: unless-stopped
        env_file:
            - ./.env
        ports:
            - 5432:5432
        volumes:
            - db-data:/var/lib/postgresql/data
            - ./init-db.sh:/docker-entrypoint-initdb.d/init-database.sh
        networks:
            - appNetwork

    pgAdmin:
        container_name: pgAdmin
        # restart: unless-stopped
        image: dpage/pgadmin4:4.29
        environment:
            PGADMIN_DEFAULT_EMAIL: ${PGADMIN_DEFAULT_EMAIL:[email protected]}
            PGADMIN_DEFAULT_PASSWORD: ${PGADMIN_DEFAULT_PASSWORD:-admin}
            PGADMIN_LISTEN_PORT: 5050
        volumes:
            - pgadmin:/root/.pgadmin
        ports:
            - "5050:5050"
        depends_on:
            -   db
        networks:
            - appNetwork

volumes:
    db-data:
    pgadmin:

networks:
    appNetwork:
        driver: bridge

Answer 1

You define PGADMIN_DEFAULT_EMAIL and PGADMIN_DEFAULT_PASSWORD and also use a persistent volume pgadmin. Maybe you previously created an instance with a different email/password which have been persisted in pgadmin volume and is not overriden by your newly defined variables.

You can try to delete stack containers and volumes with:

# WARNING: this will delete all containers and volumes
# including pg_data volume and pgadmin volume
# make sure to make a backup if needed
docker-compose down -v 

Alternatively, you can just stop pgAdmin container and specifically delete the pgadmin volume:

docker-compose rm -s pgAdmin

# Replace project_name by your Docker Compose project name
# Use docker volume ls to show all volumes and choose the proper one
docker volume rm project_name_pgadmin

Then re-create pgAdmin container and volume (and if necessary other components):

docker-compose up -d