$ sudo su -
# MYSQL_PASS=nova 设定mysql的密码和nova数据库的密码
# cat <<MYSQL_PRESEED | debconf-set-selections
>mysql-server-5.5 mysql-server/root_password password $MYSQL_PASS
>mysql-server-5.5 mysql-server/root_password_again password $MYSQL_PASS
>mysql-server-5.5 mysql-server/start_on_boot boolean true
>MYSQL_PRESEED
# apt-get install -y mysql-server
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