[LINUX] Docker installation


・ Refer to Official Site ・ CentOS Linux release 7.8.2003 (Core) · The centos-extras repository is enabled Can be confirmed below

$ less /etc/yum.repos.d/CentOS-Base.repo

-You have uninstalled the old docker Do the following

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

Set up a Docker repository

$ sudo yum install -y yum-utils

$ sudo yum-config-manager \
    --add-repo \

This will add /etc/yum.repos.d/docker-ce.repo.

Install Docker Engine

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

This will install the latest version of docker. If you want to install a specific version, do the following to find and install it:

$ yum list docker-ce --showduplicates | sort -r
$ sudo yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io

Start Docker

$ sudo systemctl start docker

This will launch docker. Check if it has started normally.

$ sudo systemctl status docker

Check if it is installed normally

Run the hello-world image and check.

$ sudo docker run hello-world

Completed when the following output is output

$ sudo docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
0e03bdcc26d7: Pull complete
Digest: sha256:4cf9c47f86df71d48364001ede3a4fcd85ae80ce02ebad74156906caff5378bc
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.
 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:

For more examples and ideas, visit:

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