Docker : Install2021/05/13

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

root@dlp:~#

apt -y install docker.io

root@dlp:~#

docker version

Client:
 Version:           20.10.2
 API version:       1.41
 Go version:        go1.13.8
 Git commit:        20.10.2-0ubuntu2
 Built:             Tue Mar  2 05:51:34 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server:
 Engine:
  Version:          20.10.2
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.13.8
  Git commit:       20.10.2-0ubuntu2
  Built:            Tue Mar  2 05:45:16 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.4.4-0ubuntu1
  GitCommit:
 runc:
  Version:          spec: 1.0.2-dev
  GitCommit:
 docker-init:
  Version:          0.19.0
  GitCommit:

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

# download official image

root@dlp:~#

docker pull ubuntu

Using default tag: latest
latest: Pulling from library/ubuntu
345e3491a907: Pull complete
57671312ef6f: Pull complete
5e9250ddb7d0: Pull complete
Digest: sha256:cf31af331f38d1d7158470e095b132acd126a7180a54f263d386da88eb681d93
Status: Downloaded newer image for ubuntu:latest
docker.io/library/ubuntu:latest

# run echo inside Container

root@dlp:~#

docker run ubuntu /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 ubuntu /bin/bash

root@b978f06ea24b:/#

# Container's console

root@b978f06ea24b:/#

uname -a

Linux b978f06ea24b 5.11.0-16-generic #17-Ubuntu SMP Wed Apr 14 20:12:43 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
root@b978f06ea24b:/#

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 ubuntu /bin/bash

root@c19fff428bea:/# root@dlp:~#

# Ctrl+p, Ctrl+q key

# show docker processes

root@dlp:~#

docker ps

CONTAINER ID   IMAGE     COMMAND       CREATED          STATUS          PORTS     NAMES
c19fff428bea   ubuntu    "/bin/bash"   17 seconds ago   Up 16 seconds             charming_carson

# connect to container's session

root@dlp:~#

docker attach c19fff428bea

root@c19fff428bea:/#

# shutdown container's process from Host's console

root@dlp:~#

docker kill c19fff428bea

c19fff428bea
root@dlp:~#

docker ps

CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES

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