Docker : Install2021/04/06

	Install Docker which is the Operating System-Level Virtualization Tool, which automates the deployment of applications inside Containers.
[1]	Install Docker CE.

# remove conflict packages with Docker first

[root@dlp ~]#

dnf -y remove podman runc

[root@dlp ~]#

curl https://download.docker.com/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo

[root@dlp ~]#

sed -i -e "s/enabled=1/enabled=0/g" /etc/yum.repos.d/docker-ce.repo

[root@dlp ~]#

dnf --enablerepo=docker-ce-stable -y install docker-ce

[root@dlp ~]#

systemctl enable --now docker

[root@dlp ~]#

rpm -q docker-ce

docker-ce-20.10.5-3.el8.x86_64

[root@dlp ~]#

docker version

Client: Docker Engine - Community
 Version:           20.10.5
 API version:       1.41
 Go version:        go1.13.15
 Git commit:        55c4c88
 Built:             Tue Mar  2 20:17:04 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.5
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       363e9a8
  Built:            Tue Mar  2 20:15:27 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.4.4
  GitCommit:        05f951a3781f4f2c1911b05e61c160e9c30eaa8e
 runc:
  Version:          1.0.0-rc93
  GitCommit:        12644e614e25b05da6fd08a38ffa0cfe1903fdec
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

[2]	Download an official image and create a Container and output the words [Welcome to the Docker World] inside the Container.

# download the image

[root@dlp ~]#

docker pull centos

Using default tag: latest
latest: Pulling from library/centos
7a0437f04f83: Pull complete
Digest: sha256:5528e8b1b1719d34604c87e11dcd1c0a20bedf46e83b5632cdeac91b8c04efc1
Status: Downloaded newer image for centos:latest
docker.io/library/centos:latest

# run echo inside Container

[root@dlp ~]#

docker run centos /bin/echo "Welcome to the Docker World!"

Welcome to the Docker World!

[3]	Connect to the interactive session of a Container with [i] and [t] option like follows. If exit from the Container session, the process of a Container finishes.

[root@dlp ~]#

docker run -it centos /bin/bash

[root@60bab47a4c89 /]#

# Container's console

[root@60bab47a4c89 /]#

uname -a

Linux 60bab47a4c89 4.18.0-294.el8.x86_64 #1 SMP Mon Mar 15 22:38:42 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
[root@60bab47a4c89 /]#

exit

exit
[root@dlp ~]#

# come back

[4]	If exit from the Container session with keeping container's process, push [Ctrl+p] and [Ctrl+q] key.

[root@dlp ~]#

docker run -it centos /bin/bash

[root@8480e1a203ba /]# [root@dlp ~]#

# Ctrl+p, Ctrl+q

# show docker processes

[root@dlp ~]#

docker ps

CONTAINER ID   IMAGE     COMMAND       CREATED          STATUS          PORTS     NAMES
8480e1a203ba   centos    "/bin/bash"   12 seconds ago   Up 11 seconds             gifted_kalam

# connect to container's session

[root@dlp ~]#

docker attach 8480e1a203ba

[root@8480e1a203ba /]#

# shutdown container's process from Host's console

[root@dlp ~]#

docker kill 8480e1a203ba

8480e1a203ba
[root@dlp ~]#

docker ps

CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES

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