Install Docker on a virtual machine

Signature: But do good deeds, don't ask about the future.

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foreword

Document the process of installing Docker on a fresh virtual machine.
Preconditions:

1. A little basic knowledge of Linux
2. CentOS7 system
3. Use the ssh connection tool to connect to the server for operation

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1. Getting to know Docker first

1. What is Docker?

Docker is an open source application container engine that allows developers to package their applications and dependencies into a portable image, and then publish it to any popular Linux or Windows operating system machine, and can also implement virtualization. Containers use a sandbox mechanism completely, and there will be no interfaces between them.

2.Docker official website

Docker official website address: https://www.docker.com/

3.Docker Documentation

Docker document address: https://docs.docker.com/

Two, Docker installation

Connect to the local virtual machine

to view the environment of the virtual machine

uname -r
3.10.0-1160.el7.x86_64

The system kernel is above 3.10

cat /etc/os-release
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

System version CentOS 7

Open the official docker help document
Docker install centos address: https://docs.docker.com/engine/install/centos/

1. Uninstall the old docker on the server

Uninstall command:

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

2. Install the required packages

Download the basic package

sudo yum install -y yum-utils  

3. Set up mirror warehouse

It is recommended to use Alibaba Cloud's mirror warehouse address, which is better than foreign blocks

sudo yum-config-manager \
    --add-repo \
    https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

4. Install the Docker engine

sudo yum install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

5. Start docker

sudo systemctl start docker

6. run hello world

sudo docker run hello-world

Seeing this means that the docker installation was successful.

3. Uninstall docker

1. Remove download dependencies

sudo yum remove docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin docker-ce-rootless-extras

2. Delete the docker folder

sudo rm -rf /var/lib/docker
sudo rm -rf /var/lib/containerd

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Summarize

The above is the whole process of installing docker on a new server according to the official docker documentation. Please correct me if there are any mistakes or shortcomings.