Symfony4 / Docker: SQLSTATE[HY000] [2002] Connection refused

docker doctrine docker-compose symfony4

I solved it by doing:

downgrade to mysql 5.7
remove command: ["--default-authentication-plugin=mysql_native_password"] from docker-compose.yml
harcoding credentials in DATABASE_URL in .env file, and referencing "mysql" (service name from docker compose) instead of 127.0.0.1
- DATABASE_URL=mysql://sf4user:sf4password@mysql:3306/sf4

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