====== CentOS 7 ======

<code>
# yum update
# yum upgrade
# yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine
# yum install -y yum-utils
# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
# yum install docker-ce docker-ce-cli containerd.io
</code>

<code>
# systemctl start docker
# docker run hello-world
</code>

<code>
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
0e03bdcc26d7: Pull complete
Digest: sha256:1a523af650137b8accdaed439c17d684df61ee4d74feac151b5b337bd29e7eec
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/
</code>

<code>
# docker ps -a
</code>
<code>
CONTAINER ID   IMAGE         COMMAND    CREATED         STATUS                     PORTS     NAMES
65fd944cccab   hello-world   "/hello"   3 minutes ago   Exited (0) 3 minutes ago             vibrant_tharp
</code>

<code>
# docker rm 65fd944cccab
# docker ps -a
</code>
<code>
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
</code>

<code>
# docker images
</code>

<code>
REPOSITORY    TAG       IMAGE ID       CREATED         SIZE
hello-world   latest    bf756fb1ae65   12 months ago   13.3kB
</code>

<code>
# docker rmi bf756fb1ae65
# docker images
</code>

<code>
REPOSITORY   TAG       IMAGE ID       CREATED       SIZE
</code>