Shulou(Shulou.com)06/03 Report--

Foreword:

Docker is an open source application container engine that allows developers to package their applications and dependencies into a portable image and publish them to any popular Linux or Windows machine. In recent years, the development of Docker is in full swing in China, especially in Internet companies, the use of Docker is very common, which greatly improves the maintenance efficiency of applications and reduces the cost of cloud computing application development. The main purpose of this article is to get you started with Docker, introducing the installation and easy use of Docker.

1. Install Docker

To learn Docker, we first need to install Docker, which is divided into CE (Community Edition: community Edition) and EE (Enterprise Edition: enterprise Edition) after version 17.03. let's take the CentOS system as an example to introduce the installation of Docker Community Edition:

Uninstall the old version

The old version of Docker is called docker or docker-engine, and use the following command to uninstall the old version:

$sudo yum remove docker\ docker-client\ docker-client-latest\ docker-common\ docker-latest\ docker-latest-logrotate\ docker-logrotate\ docker-engine

Install dependency packages

# configure yum source sudo yum-config-manager\-- add-repo\ https://mirrors.ustc.edu.cn/docker-ce/linux/centos/docker-ce.repo# installation dependency package sudo yum install-y yum-utils\ device-mapper-persistent-data\ lvm2

Install the latest version of Docker CE

Sudo yum-config-manager-enable docker-ce-edgesudo yum makecache fastsudo yum install docker-ce

Start Docker CE

Sudo systemctl enable dockersudo systemctl start docker

Establish a docker user group

Sudo groupadd dockersudo usermod-aG docker $USER

Run the hello-world test

$docker run hello-world Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world ca4f61b1923c: Pull complete Digest: sha256:be0cd392e45be79ffeffa6b05338b98ebb16c87b255f48e297ec7f98e123905c Status: Downloaded newer image for hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. (amd64) 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. To try something more ambitious, you can run an Ubuntu container with: $docker run-it ubuntu bash Share images, automate workflows, and more with a free Docker ID: https://hub.docker.com/ For more examples and ideas, visit: https://docs.docker.com/get-started/

So far, we have successfully installed Docker. Similarly, it is very easy to install Docker in Windows system and macOS system. Download the Docker Desktop installation package and install it. For more information, please refer to the following official documentation:

Https://docs.docker.com/docker-for-windows/install/

Https://docs.docker.com/docker-for-mac/install/

two。 Introduction to common commands

To learn Docker, we first need to know its overall architecture. Here are three basic concepts of Docker:

Image: Docker image (Image), which is equivalent to a root file system. For example, the official image ubuntu:16.04 contains a complete set of Ubuntu16.04 minimal system root file system. Container: the relationship between Image and Container, just like classes and instances in object-oriented programming, the image is a static definition, and the container is the entity of the mirror runtime. Containers can be created, started, stopped, deleted, paused, and so on. Warehouse (Repository): the warehouse can look at a code control center to hold the image.

Mirror related commands:

1) find the image

Docker search image name (for example, redis)

2) download the image

Docker pull image name

3) View the list of local images

Docker images

4) Delete the image

Docker rmi Mirror ID

Container-related commands:

1) run the image as a container

Docker run-- name of the name container-- name of the d image

-d stands for detached, which means that the console will not be blocked after executing this command and can continue to enter the command.

2) get the list of running containers

Docker ps

3) get the list of all containers that contain comments to exit

Docker ps-a

4) stop and start the container

Docker start/stop Container name / id

5) Port mapping

The port of the software running in the container needs to be mapped to the port of the host, otherwise the host in the local area network cannot be accessed.

Docker run-d-p 6378 6379-- name myRedis redis

-p: Port 6379 in the container is mapped to port 6378 of the host

6) Delete the container

Docker rm id

7) View the current container log

Docker logs name/id

8) log in to the container

Docker exec-it container name bash

-I: make sure our input is valid

-t: a pseudo terminal will be assigned

Log in to access the current container. After logging in, you can perform regular Linux command operations in the container, and you can also log out using the exit command.

Summary:

This article briefly introduces the installation of Docker and common commands, as an introduction to the article, I hope to help you. In fact, Docker as a basic tool, it is recommended that you learn, for example, you can start a MySQL instance in seconds, there is a new version can also be run with Docker to test. The next article is going to write about how to run and configure MySQL in Docker. Look forward to it!

Reference:

Https://docs.docker.com/install/linux/docker-ce/centos/

To mumble:

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Tencent Cloud:

Https://cloud.tencent.com/act/double11/reserve?spread_hash_key=1isLgW

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