Optimize image size

Combined RUN commands and cleared up yum cache after package install

Author: ltangvald

README.md

@@ -12,15 +12,15 @@ The new document store features of MySQL are implemented as a plugin to MySQL Se
 
 Invoke the shell as follows:
 
-    docker run -it -e MYSQL_HOST=mysqlhostname mysql-shell init
+    docker run -it -e MYSQL_HOST=<hostname> mysql-shell init
 
 You will be asked to enter the password for the server's root user. You should see a message that the mysqlx plugin has been installed.
 
 # Connecting to mysqlx-enabled server
 
 To connect to the server, simply run the mysql-shell image the same way you would start a normal MySQL client:
 
-    docker run -it mysql-shell -u <username> -h mysqlhostname
+    docker run -it mysql-shell -u <username> -h <hostname>
 
 Once logged in, if you run `\status`, the shell should respond with `Session type: X`.
 

Shell/Dockerfile

@@ -1,8 +1,9 @@
 FROM oraclelinux:latest
 
-RUN yum install -y wget
-RUN wget http://repo.mysql.com/yum/mysql-tools-preview/el/7/x86_64/mysql-shell-1.0.3-1.el7.x86_64.rpm
-RUN yum install -y mysql-shell-1.0.3-1.el7.x86_64.rpm
+RUN yum install -y wget \
+  && wget http://repo.mysql.com/yum/mysql-tools-preview/el/7/x86_64/mysql-shell-1.0.3-1.el7.x86_64.rpm \
+  && yum install -y mysql-shell-1.0.3-1.el7.x86_64.rpm \
+  && rm -rf /var/cache/yum/*
 
 COPY docker-entrypoint.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]