Step 1: Update packages

sudo apt update

Step 2: Install a few prerequisite packages

sudo apt install apt-transport-https ca-certificates curl software-properties-common

Step 3: Add the GPG key for the official Docker repository

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

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

Docker Network Mode

• bridge: setup ip for every container, and connect container to docker0 network bridge. (Default mode)
• host: The container will not virtualize it's own net, it share the ip and port with host.
• none: The container own its own network namespace, but there is no netowrk settings, such as veth pair, bridge connection, ip, etc.

Brief

Compose is a tool software come from Docker, which can manage an application from multiple docker containers. You need to define a YAML file docker-compose.yml, to define the relationship among containers. Then, to startup or shutdown with one command.

Download

Reduce Docker File Size

Docker Desktop for Windows v2, which uses WSL2, stores all image and container files in a separate virtual volume (vhdx). This virtual hard disk file can automatically grow when it needs more space (to a certain limit). Unfortunately, if you reclaim some space, i.e. by removing unused images, vhdx doesn't shrink automatically.
Please reclaim some space on windows following the steps below:

The docker will download image from remote repository during run a container based on a not existing image locally. The Docker hub is the public image repository.

List all local images

docker images

Pull a new image from remote repository

docker pull ubuntu:13.10

Port Mapping

docker run -d -P training/webapp python app.py
docker run -d -p 5000:5000 training/webapp python app.py

Dockerfile Basic

Basic Rules

• Every reserved words command need to use upper case and follow at least one argument
• The commands are executed from top to bottom as order.
• # means comment
• Every command will create a image layer to commit to final image.

Run windows in docker
Run MacOS in docker

Load image remotely

docker pull ubuntu

Check all the containers

docker ps -a

Container Operating

Start Container

docker run -it ubuntu /bin/bash