Does docker need to be installed?

Using docker requires installation; Docker is an open source application container engine. To install Docker on liunx, the operating system requires a 64-bit operating system, and the kernel version needs to be 3.10 or above. Install docker on CentOS. Then use CentOS 7.0 to meet the requirements for installation.

The operating environment of this tutorial: linux7.3 system, docker-1.13.1 version, Dell G3 computer.

Docker needs to be installed?

CentOS Docker installation

Use the official installation script to install automatically

The installation command is as follows:

curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun

You can also use the domestic daocloud one-click installation command:

curl -sSL https://get.daocloud.io/docker | sh

Manual installation

Uninstall the old version

Older versions of Docker are called 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

Install Docker Engine-Community

Installation using Docker repository

Before installing Docker Engine-Community for the first time on a new host, you need to set up Docker storehouse. Afterwards, you can install and update Docker from the repository.

Set up the repository

Install the required packages. yum-utils provides yum-config-manager, and the device mapper storage driver requires device-mapper-persistent-data and lvm2.

$ sudo yum install -y yum-utils \
  device-mapper-persistent-data \
  lvm2

Use the following commands to set up a stable repository.

Use the official source address (relatively slow)

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

You can choose some domestic source addresses:

Alibaba Cloud

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

Tsinghua University source

$ sudo yum-config-manager \
    --add-repo \
    https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/centos/docker-ce.repo

Install Docker Engine-Community

Install the latest version of Docker Engine-Community and containerd, or go to the next step to install a specific version:

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

If prompted You accept GPG keys, please select Yes.

Are there multiple Docker repositories?

If multiple Docker repositories are enabled, the installation or update performed without specifying a version in the yum install or yum update command will always install the highest version, which may not be suitable for your stability need.

Docker is not started by default after installation. And the docker user group has been created, but there are no users under this user group.

To install a specific version of Docker Engine-Community, list the available versions in the repository, then select and install:

1. List and sort the versions available in your repository . This example sorts the results by version number (highest to lowest).

$ yum list docker-ce --showduplicates | sort -r
docker-ce.x86_64  3:18.09.1-3.el7                     docker-ce-stable
docker-ce.x86_64  3:18.09.0-3.el7                     docker-ce-stable
docker-ce.x86_64  18.06.1.ce-3.el7                    docker-ce-stable
docker-ce.x86_64  18.06.0.ce-3.el7                    docker-ce-stable

2. Install a specific version by its complete package name, which is the package name (docker-ce) plus the version string (second column), starting with the first colon ( :) up to the first hyphen, separated by a hyphen (-). For example: docker-ce-18.09.1.

$ sudo yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io

Start Docker.

$ sudo systemctl start docker

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

$ sudo docker run hello-world

Uninstall docker

Delete the installation package:

yum remove docker-ce

Delete images, containers, configuration files, etc.:

rm -rf /var/lib/docker

Recommended Study: "docker video tutorial"

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