Minimize layers.

Dockerfile

@@ -1,6 +1,9 @@
 # Use Hadoop as the base image.
 # Since Sqoop requires Hadoop to be running in the background.
-FROM ghcr.io/kasipavankumar/hadoop-docker:latest
+FROM ghcr.io/kasipavankumar/hadoop-docker:1.0.3
+
+LABEL author="D. Kasi Pavan Kumar <devdkpk@gmail.com>"
+LABEL version="1.0.2"
 
 # Set working directory to / (home).
 WORKDIR /
@@ -9,13 +12,12 @@ WORKDIR /
 RUN apt-get update && apt-get install -y \
     unzip \
     mysql-server \
+    wget \
     && rm -rf /var/lib/apt/lists/*
 
 # Download & uncompress Apache Sqoop v1.4.7.
-RUN wget -qO- http://archive.apache.org/dist/sqoop/1.4.7/sqoop-1.4.7.bin__hadoop-2.6.0.tar.gz | tar xvz
-
-# Rename the directory "sqoop" for easy reference.
-RUN mv sqoop-1.4.7.bin__hadoop-2.6.0 sqoop
+RUN wget -qO- http://archive.apache.org/dist/sqoop/1.4.7/sqoop-1.4.7.bin__hadoop-2.6.0.tar.gz | tar xvz \ 
+    && mv sqoop-1.4.7.bin__hadoop-2.6.0 sqoop
 
 # Set SQOOP_HOME.
 ENV SQOOP_HOME=/sqoop
@@ -24,29 +26,27 @@ ENV SQOOP_HOME=/sqoop
 ENV PATH=$PATH:${SQOOP_HOME}/bin
 
 # Download & decompress MySQL connector.
-RUN wget -qO- http://ftp.ntu.edu.tw/MySQL/Downloads/Connector-J/mysql-connector-java-8.0.26.tar.gz | tar xvz
-
-# Move MySQL connector to Sqoop's lib directory.
-RUN mv mysql-connector-java-8.0.26/mysql-connector-java-8.0.26.jar $SQOOP_HOME/lib \
+RUN wget -qO- http://ftp.ntu.edu.tw/MySQL/Downloads/Connector-J/mysql-connector-java-8.0.26.tar.gz | tar xvz \
+    && mv mysql-connector-java-8.0.26/mysql-connector-java-8.0.26.jar $SQOOP_HOME/lib \
     && rm -rf mysql-connector-java-8.0.26
 
 # Download the commons lang.
-RUN wget https://repo1.maven.org/maven2/commons-lang/commons-lang/2.6/commons-lang-2.6.jar
-
-# Move commons lang to Sqoop's lib.
-RUN mv commons-lang-2.6.jar $SQOOP_HOME/lib
+RUN wget https://repo1.maven.org/maven2/commons-lang/commons-lang/2.6/commons-lang-2.6.jar \
+    && mv commons-lang-2.6.jar $SQOOP_HOME/lib
 
 # Download & unzip a sample database.
 # https://dev.mysql.com/doc/employee/en/employees-installation.html
 RUN wget https://github.com/datacharmer/test_db/archive/refs/heads/master.zip \
-    && unzip master.zip
+    && unzip master.zip \
+    && apt-get remove unzip wget --yes \ 
+    && apt-get autoremove --yes
 
 # Rename sqoop-env-template.sh → sqoop-env.sh.
 RUN mv $SQOOP_HOME/conf/sqoop-env-template.sh $SQOOP_HOME/conf/sqoop-env.sh
 
 # Edit Hadoop variables in "sqoop-env.sh".
-RUN echo "export HADOOP_COMMON_HOME=/hadoop-3.3.1" >> $SQOOP_HOME/conf/sqoop-env.sh
-RUN echo "export HADOOP_MAPRED_HOME=/hadoop-3.3.1" >> $SQOOP_HOME/conf/sqoop-env.sh
+RUN echo "export HADOOP_COMMON_HOME=/hadoop-3.3.1" >> $SQOOP_HOME/conf/sqoop-env.sh \
+    && echo "export HADOOP_MAPRED_HOME=/hadoop-3.3.1" >> $SQOOP_HOME/conf/sqoop-env.sh
 
 # Copy required files to the image.
 COPY init.sh create_user.sql /