Mysql-Server installation stuck on root password

I trying to install mysql-server into a Docker container so in my Dockerfile I've added apt-get install mysql-server , install runs until it demand to provide the root user's password and then just stuck there and nothing happens even when I provide a blank password.

Configuring mysql-server-5.5


While not mandatory, it is highly recommended that you set a password for the 
MySQL administrative "root" user.

If this field is left blank, the password will not be changed.

New password for the MySQL "root" user:

I don't know if it's a bug or if it have anything to do with docker Anyone encountered this before ?

Solution 1:

You have to set the password before installing MySQL:

# MySQL
ENV MYSQL_PWD Pwd123
RUN echo "mysql-server mysql-server/root_password password $MYSQL_PWD" | debconf-set-selections
RUN echo "mysql-server mysql-server/root_password_again password $MYSQL_PWD" | debconf-set-selections
RUN apt-get -y install mysql-server