Database Server is not found. Please verify the login, password and server fields (DbPDO)

[Alexooisq]

Hi folks, im trying to install prestashop on my aws ubuntu instance. performed the following commands to install prestashop and create database. Somehow when setting up prestashop via web UI, ive got "Database Server is not found. Please verify the login, password and server fields (DbPDO)" when trying to connect to database. Please advise. Thank you.

sudo su

sudo apt update && sudo apt upgrade -y

sudo apt-get install docker

apt install docker.io -y

service docker start

docker pull prestashop/prestashop

docker network create prestashop-net

docker run -ti --name helen-mysql --network prestashop-net –e MYSQL_ROOT_PASSWORD=admin -p 3307:3306 -d mysql:5.7 

docker run -p 80:80 prestashop/prestashop

[TiaNex Shopping]

very dispoint with prestashop all version can't instll now,

all kinds of errors including this database error,  affer i changed to a old user/password (user for other database) this error dispeared,but still too many other problems