Docker installation and configuration image acceleration implementation

Docker version

With the rapid development of Docker and the launch of enterprise-level functions, better services mean that you need to pay a certain fee. Currently, Docker is divided into two versions:

• community-edition
• enterprise-edition

Docker Enterprise Edition (EE) is designed for enterprise development and IT teams to build, ship, and run business-critical applications in production at scale. Docker EE is integrated, certified, and supported, providing enterprises with the industry’s most secure container platform to modernize all their applications. As an application-centric platform, Docker EE is designed to accelerate and secure the entire software supply chain, from development to production running on any infrastructure.

We can learn Docker using the CE community edition.

Install Docker Engine on CentOS

Docker supports Mac, Windows, and Linux. This article uses the Linux environment to teach you how to install Docker and configure image acceleration based on CentOS.

Official documentation: https://docs.docker.com/

System requirements

The official website prompts that if you want to install Docker Engine, you need a stable version of CentOS 7 or above.

Uninstall old versions

Older Docker versions used docker or docker-engine . If these programs are installed, uninstall them and their associated dependencies.

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

Docker images, containers, data volumes, and network data are all stored in /var/lib/docker/ . The new Docker Engine package is now Docker-ce .

Setting up yum source

Install the yum-utils package (which provides yum-config-manager program) and set up a stable yum repository to download Docker Engine.

# Install yum-utils
sudo yum install -y yum-utils
# Set the yum source to Alibaba Cloud to facilitate downloading Docker Engine
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

Docker Installation

Install the latest version of Docker Engine and Containers.

sudo yum install docker-ce docker-ce-cli containerd.io

If you are prompted to accept the GPG key during installation, verify that the fingerprint matches 060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35 and accept it if so.

Starting and stopping Docker

# Start Docker
sudo systemctl start docker
# Stop Docker
sudo systemctl stop docker
# Restart Docker
sudo systemctl restart docker
# Set boot up sudo systemctl enable docker
# View docker status sudo systemctl status docker
# View the running status of the container in docker sudo docker stats
# View docker overview information sudo docker info
# View the docker help documentation sudo docker --help

Installation Verification

[root@localhost ~]# docker -v
Docker version 19.03.12, build 48a66213fe
[root@localhost ~]# docker version
Client: Docker Engine - Community
 Version: 19.03.12
 API version: 1.40
 Go version: go1.13.10
 Git commit: 48a66213fe
 Built: Mon Jun 22 15:46:54 2020
 OS/Arch: linux/amd64
 Experimental: false

Server: Docker Engine - Community
 Engine:
 Version: 19.03.12
 API version: 1.40 (minimum version 1.12)
 Go version: go1.13.10
 Git commit: 48a66213fe
 Built: Mon Jun 22 15:45:28 2020
 OS/Arch: linux/amd64
 Experimental: false
 containerd:
 Version: 1.2.13
 GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
 Version: 1.0.0-rc10
 GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
 Version: 0.18.0
 GitCommit: fec3683

Configuring Image Acceleration

Docker pulls images from Docker Hub. Since they are obtained from overseas, the speed is slow, and the following situations may occur:

[root@localhost ~]# docker run hello-world
Unable to find image 'hello-world:latest' locally
docker: Error response from daemon: Get https://registry-1.docker.io/v2/library/hello-world/manifests/latest: net/http: TLS handshake timeout.
See 'docker run --help'.

You can obtain images from China by configuring domestic image sources to increase the pulling speed. Here we introduce the open source mirror of the University of Science and Technology of China (LUG@USTC): https://docker.mirrors.ustc.edu.cn and the open source mirror of NetEase: http://hub-mirror.c.163.com

USTC is a long-established Linux image service provider, and its Docker image acceleration service is very fast. One of the advantages of USTC and NetEase is that they do not require registration and are truly public services. (You can also use the mirror acceleration service of other service providers such as Alibaba)

Edit the file daemon.json .

vi /etc/docker/daemon.json

Enter the following content into the file and save it.

{
 "registry-mirrors": ["http://hub-mirror.c.163.com", "https://docker.mirrors.ustc.edu.cn"]
}

Reload the configuration information and restart the Docker service.

# Reload the configuration file of a service sudo systemctl daemon-reload
# Restart Docker
sudo systemctl restart docker

hello-world

Verify that Docker Engine was installed correctly by running the hello-world image.

[root@localhost ~]# docker run hello-world
Unable to find image 'hello-world:latest' locally # Unable to find hello-world image latest: Pulling from library/hello-world # Pull the latest version of hello-world image 0e03bdcc26d7: Pull complete 
Digest: sha256:49a1c8800c94df04e9658809b006fd8a686cab8028d33cfba2cc049724254202
Status: Downloaded newer image for hello-world:latest

# Seeing this message means your installation is successful.
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 creates 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/

The execution flow chart of docker run hello-world command is as follows.

Through the above steps, you have completed all the work of Docker installation. Next, you can become more familiar with the use of Docker by learning image commands and container commands.

This is the end of this article about Docker installation and configuration of image acceleration. For more information about Docker installation and image acceleration, please search for previous articles on 123WORDPRESS.COM or continue to browse the following related articles. I hope you will support 123WORDPRESS.COM in the future!