miltonbecker/docker-course

docker-course - notes

General info

docker info

Listing images and containers

docker images -a

docker ps -a

Creating and Running containers

docker container run -p hostPort:containerPort imageName:imageVersion

docker container run httpd:2.4

Create and run a container based on the image for the Apache HTTP Server version 2.4

... --detach|-d

Runs the container in the background

... --name aName

Sets a name for the container, so we can latter reference to it using its name instead of its id

... --rm

Deletes the container when it stops running

Volume mapping

... -v localPath:containerPath

Creates a link between your local directory and a directory in the container, so you don't lose that data when the container is stopped

Creating images from a Dockerfile

docker image build --tag setImageName:setImageVersion .

The dot tells docker to look for a Dockerfile in the current directory

Executing commands in a running container

docker container exec apt-get update && apt-get install -y fortunes

docker container exec -it containerId|containerName /bin/bash

This will start an interactive shell with the container

Copying files into a running container

docker container cp yourLocalFilePath containerName:containerDirectoryTarget

docker container cp page.html myImage:/usr/local/apache2/htdocs/

Sample Dockerfile

LABEL maintainer="miltonbecker@gmail.com"

# Base image
FROM node:boron

# Create app directory
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

# Install app dependencies
COPY package.json /usr/src/app/
RUN npm install --production

# You can run any command with RUN, like RUN apt-get update && apt-get install -y fortunes

# Bundle app source
COPY . /usr/src/app

EXPOSE 8000

CMD [ "npm", "start" ]