05. Dockerfile Example

Make Dockerfile

From centos
MAINTAINER why<nutterair1989@gmail.com>
ENV MYPATH /usr/local
WORKDIR $MYPATH

RUN yum -y install vim
RUN yum -y install net-tools
RUN yum -y install glibc.i686
RUN mkdir /usr/local/java
ADD jdk-8u171-linux-x64.tar.gz /usr/local/java
ENV JAVA_HOME /usr/local/java/jdk1.8.0_171
ENV JRE_HOME $JAVA_HOME/jre
ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib:$CLASSPATH
ENV PATH $JAVA_HOME/bin:$PATH

EXPOSE 80

Build Dockerfile

docker build -t centosjava8:1.5 .

Dangling Image

Both repo and tag are <none> is dangling image, which will happened during deleting or building a dockerfile.

List all dangling images

docker image ls -f dangling=true

Delete all dangling images

docker image prune

Reference

1. Tutoriaspoint
2. Docker Dockerfile on runoob
3. Dockerfile reference (official)