Docker install and first Dockerfile

preface

This article only explains the installation of Docker and the creation of Dockerfile. Dockerfile is composed of different commands in different requirements, which can be understood as a configuration file. However, only a demo is shown here to show the basic usage of Dockerhtml

Server environment

linux centos 7.6linux

install

  • step 1

If you have installed an older version of docker, you need to uninstall it firstnginx

sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-selinux \
                  docker-engine-selinux \
                  docker-engine
  • step 2

install dependenciesdocker

sudo yum install -y yum-utils \
           device-mapper-persistent-data \
           lvm2
  • step 3

set stable Repositoryvim

sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo
  • step 4

install dockercentos

sudo yum install docker-ce docker-ce-cli containerd.io
  • step 5

start docker serviceapp

sudo systemctl start docker
  • step 6

Run a demo to see if the installation was successfului

: The hello-world image is not in your local, but when you run the command, docker will pulls the helloworld image from the remote repositorycode

sudo docker run hello-world

create a demo

  • step 1

create dockerfilehtm

Choose any directory and create a dockerfile.

It is suggested to name 'Dockerfile', because by default docker will run the file called 'Dockerfile' in the current directory. If you give it a different name, add the -f parameter and the path of the dockerfile

vim Dockerfile

FROM nginx
MAINTAINER author <email>
RUN echo '<h1>Hello, Docker!</h1>' > /usr/share/nginx/html/index.html

:wq
  • step 2

build image

docker build -t test/hello-world: .

-t is to set the repository and image

test is repository name

hello-world as the image name

  • step 3

run image

docker run --name hello -d -p 8080:80   test/hello
  • step 4

Browser input http://localhost:8080/

final

This is a simple example of using Dockerfile to build the image and run the container!

相關文章
相關標籤/搜索