Docker Overview

• Docker is the worlds leading software container platform.
• Docker is a tool designed to make it easier to deploy & run applications by using containers.

Installation

• Install docker

• Check docker version

docker version

• Run sample application

docker run hello-world

Images, Containers

• Docker images are templates used to create docker containers.

• Containers is running instance of images.

• See all images

docker images

• See all containers

docker ps -a

• See all running containers

docker ps

• Run docker image

docker run imageName/ID

Create Dockerfile

• Create dockerfile.

• Build an image from dockerfile.

• Create Dockerfile and add these lines in dockerfile

FROM golang:latest
MAINTAINER  "Vikram Ingawale" <vikram.ingawale91@gmail.com>
WORKDIR /go/src/app
COPY . .
RUN go get -d -v ./...
RUN go install -v ./...
CMD ["app"]

Build an image from the Dockerfile

• Build the image using the docker build command.

docker build -t myhelloworld .

• -t parameter gives tag to yout image.
• dot(.) at the end means this command reads the Dockerfile from the current directory otherwise specify Dockerfile path.

Create a container from your image & run

• to create container use command.

docker run -d -p 80:80 imageName

• -d means run this detached, as a daemon not dependent on the terminal session.
• -p means map ports.
• access it with http://localhost:80

Push docker image

• Create docker hub account.
• Run command in docker cli

docker login

• Add a docker tag to image.

docker tag <imageName/ID>  <docker hub username>/<target imageName>:<version or tag>

• Push your image.

docker push <docker hub username>/<target imageName>

• Look at your docker hub account. Your image should be there.

• See images on your machine

docker images

Pull docker image

• To pull image from docker hub use below commands

docker run -d -p 80:80 <docker hub username>/<imageName>

docker run imageName/ID

Stop running container

docker stop containerName/ID

Remove image

docker rmi -f <imageName/ID>

• -f is for forcefully delete.

Remove container

docker rm containerName/ID

For more details please refer notes section