Hive: Cannot connect to SQL inside Docker

I am trying to create a docker container with hadoop and hive. Here is my Dockerfile

FROM ubuntu:latest

USER root
RUN apt-get update
#RUN apt-get -y install default-jre
RUN apt-get install -y python-pip python-dev build-essential
RUN apt-get install -y libmysqlclient-dev
RUN apt-get install -y python-mysqldb
RUN apt-get update && 
    apt-get upgrade -y && 
    apt-get install -y git

ENV HADOOP_HOME /opt/hadoop
ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64

# install packages
RUN 
  apt-get update && apt-get install -y 
  ssh 
  rsync 
  vim 
  openjdk-8-jdk

# create ssh keys
RUN 
  ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa && 
  cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys && 
  chmod 0600 ~/.ssh/authorized_keys

RUN DEBIAN_FRONTEND=noninteractive apt install -y mysql-client
RUN DEBIAN_FRONTEND=noninteractive apt install -y mysql-server

WORKDIR /opt

# download and extract hadoop, set JAVA_HOME in hadoop-env.sh, update path
RUN wget --no-check-certificate https://www-us.apache.org/dist/hadoop/common/hadoop-2.8.5/hadoop-2.8.5.tar.gz
RUN tar -xzf hadoop-2.8.5.tar.gz
RUN mv hadoop-2.8.5 $HADOOP_HOME
RUN echo "export JAVA_HOME=$JAVA_HOME" >> $HADOOP_HOME/etc/hadoop/hadoop-env.sh
RUN echo "PATH=$PATH:$HADOOP_HOME/bin" >> ~/.bashrc
RUN rm hadoop-2.8.5.tar.gz

ARG HIVE_VERSION
# Set HIVE_VERSION from arg if provided at build, env if provided at run, or default
# https://docs.docker.com/engine/reference/builder/#using-arg-variables
# https://docs.docker.com/engine/reference/builder/#environment-replacement
ENV HIVE_VERSION=${HIVE_VERSION:-2.3.2}

ENV HIVE_HOME /opt/hive
ENV PATH $HIVE_HOME/bin:$PATH
RUN echo "PATH=$PATH:$HIVE_HOME/bin" >> ~/.bashrc

#Install Hive and PostgreSQL JDBC
RUN apt-get update && apt-get install -y wget procps && 
    wget --no-check-certificate https://archive.apache.org/dist/hive/hive-$HIVE_VERSION/apache-hive-$HIVE_VERSION-bin.tar.gz && 
    tar -xzvf apache-hive-$HIVE_VERSION-bin.tar.gz && 
    mv apache-hive-$HIVE_VERSION-bin hive && 
    rm apache-hive-$HIVE_VERSION-bin.tar.gz && 
    apt-get clean && 
    rm -rf /var/lib/apt/lists/*

ADD mysql-connector-java-5.1.47.jar /opt/hive/lib
ADD hive-site.xml /opt/hive/conf

and here is the hive-site.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>

<property>
  <name>javax.jdo.option.ConnectionURL</name>
  <value>jdbc:mysql://localhost:3306/metastore?createDatabaseIfNotExist=true&amp;autoReconnect=true&amp;useSSL=false</value>
</property>


<property>
  <name>javax.jdo.option.ConnectionDriverName</name>
  <value>com.mysql.jdbc.Driver</value>
</property>

<property>
  <name>javax.jdo.option.ConnectionUserName</name>
  <value>root</value>
</property>

<property>
  <name>javax.jdo.option.ConnectionPassword</name>
  <value>root</value>
</property>

<property>
  <name>datanucleus.autoCreateSchema</name>
  <value>true</value>
</property>

<property>
  <name>datanucleus.fixedDatastore</name>
  <value>true</value>
</property>

<property>
 <name>datanucleus.autoCreateTables</name>
 <value>True</value>
 </property>

</configuration>

I am able to build and run the container. When I exec into the container, i can easily do

[email protected]:/opt/hive/conf# mysql -uroot -ppassword
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 191
Server version: 5.7.25-0ubuntu0.18.04.2 (Ubuntu)

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql>

but when i try to do hive --service metastore, i get

Caused by: java.sql.SQLException: Unable to open a test connection to the given database. JDBC url = jdbc:mysql://localhost:3306/metastore?createDatabaseIfNotExist=true&autoReconnect=true&useSSL=false, username = root. Terminating connection pool (set lazyInit to true if you expect to start your database after your app). Original Exception: ------
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.

here are the grants that the root user has

[email protected]:/opt/hive/conf# mysql -uroot -ppassword
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 205
Server version: 5.7.25-0ubuntu0.18.04.2 (Ubuntu)

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> show grants;
+---------------------------------------------------------------------+
| Grants for [email protected]                                           |
+---------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION |
| GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION        |
+---------------------------------------------------------------------+
2 rows in set (0.00 sec)

mysql>

what am i doing wrong? What else do i have to do in order to use hive inside docker container?

Source: StackOverflow